diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2023-04-28 14:02:54 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2023-04-28 14:02:54 -0700 |
| commit | 2aff7c706c7483f4895ca250c92c1d71e45b6e82 (patch) | |
| tree | cee7e1a55c8fc61e686912076b10f246ca9d6760 | |
| parent | 22b8cc3e78f5448b4c5df00303817a9137cd663f (diff) | |
| parent | 611d4c716db0141cfc436994dc5aff1d69c924ad (diff) | |
| download | lwn-2aff7c706c7483f4895ca250c92c1d71e45b6e82.tar.gz lwn-2aff7c706c7483f4895ca250c92c1d71e45b6e82.zip | |
Merge tag 'objtool-core-2023-04-27' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull objtool updates from Ingo Molnar:
- Mark arch_cpu_idle_dead() __noreturn, make all architectures &
drivers that did this inconsistently follow this new, common
convention, and fix all the fallout that objtool can now detect
statically
- Fix/improve the ORC unwinder becoming unreliable due to
UNWIND_HINT_EMPTY ambiguity, split it into UNWIND_HINT_END_OF_STACK
and UNWIND_HINT_UNDEFINED to resolve it
- Fix noinstr violations in the KCSAN code and the lkdtm/stackleak code
- Generate ORC data for __pfx code
- Add more __noreturn annotations to various kernel startup/shutdown
and panic functions
- Misc improvements & fixes
* tag 'objtool-core-2023-04-27' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (52 commits)
x86/hyperv: Mark hv_ghcb_terminate() as noreturn
scsi: message: fusion: Mark mpt_halt_firmware() __noreturn
x86/cpu: Mark {hlt,resume}_play_dead() __noreturn
btrfs: Mark btrfs_assertfail() __noreturn
objtool: Include weak functions in global_noreturns check
cpu: Mark nmi_panic_self_stop() __noreturn
cpu: Mark panic_smp_self_stop() __noreturn
arm64/cpu: Mark cpu_park_loop() and friends __noreturn
x86/head: Mark *_start_kernel() __noreturn
init: Mark start_kernel() __noreturn
init: Mark [arch_call_]rest_init() __noreturn
objtool: Generate ORC data for __pfx code
x86/linkage: Fix padding for typed functions
objtool: Separate prefix code from stack validation code
objtool: Remove superfluous dead_end_function() check
objtool: Add symbol iteration helpers
objtool: Add WARN_INSN()
scripts/objdump-func: Support multiple functions
context_tracking: Fix KCSAN noinstr violation
objtool: Add stackleak instrumentation to uaccess safe list
...
84 files changed, 641 insertions, 684 deletions
diff --git a/Documentation/livepatch/reliable-stacktrace.rst b/Documentation/livepatch/reliable-stacktrace.rst index 67459d2ca2af..d56bb706172f 100644 --- a/Documentation/livepatch/reliable-stacktrace.rst +++ b/Documentation/livepatch/reliable-stacktrace.rst @@ -183,7 +183,7 @@ trampoline or return trampoline. For example, considering the x86_64 .. code-block:: none SYM_CODE_START(return_to_handler) - UNWIND_HINT_EMPTY + UNWIND_HINT_UNDEFINED subq $24, %rsp /* Save the return values */ diff --git a/MAINTAINERS b/MAINTAINERS index 32772c383ab7..49125237c920 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -15180,8 +15180,8 @@ OBJTOOL M: Josh Poimboeuf <jpoimboe@kernel.org> M: Peter Zijlstra <peterz@infradead.org> S: Supported +F: include/linux/objtool*.h F: tools/objtool/ -F: include/linux/objtool.h OCELOT ETHERNET SWITCH DRIVER M: Vladimir Oltean <vladimir.oltean@nxp.com> diff --git a/arch/alpha/kernel/process.c b/arch/alpha/kernel/process.c index e9cf7193eb81..582d96548385 100644 --- a/arch/alpha/kernel/process.c +++ b/arch/alpha/kernel/process.c @@ -9,6 +9,7 @@ * This file handles the architecture-dependent parts of process handling. */ +#include <linux/cpu.h> #include <linux/errno.h> #include <linux/module.h> #include <linux/sched.h> @@ -59,9 +60,10 @@ void arch_cpu_idle(void) wtint(0); } -void arch_cpu_idle_dead(void) +void __noreturn arch_cpu_idle_dead(void) { wtint(INT_MAX); + BUG(); } #endif /* ALPHA_WTINT */ diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index 0b8c25763adc..f4a4ac028b6b 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -320,7 +320,7 @@ void __cpu_die(unsigned int cpu) * of the other hotplug-cpu capable cores, so presumably coming * out of idle fixes this. */ -void arch_cpu_idle_dead(void) +void __noreturn arch_cpu_idle_dead(void) { unsigned int cpu = smp_processor_id(); @@ -382,6 +382,8 @@ void arch_cpu_idle_dead(void) : "r" (task_stack_page(current) + THREAD_SIZE - 8), "r" (current) : "r0"); + + unreachable(); } #endif /* CONFIG_HOTPLUG_CPU */ @@ -777,7 +779,7 @@ void smp_send_stop(void) * kdump fails. So split out the panic_smp_self_stop() and add * set_cpu_online(smp_processor_id(), false). */ -void panic_smp_self_stop(void) +void __noreturn panic_smp_self_stop(void) { pr_debug("CPU %u will stop doing anything useful since another CPU has paniced\n", smp_processor_id()); diff --git a/arch/arm64/include/asm/exception.h b/arch/arm64/include/asm/exception.h index 92963f98afec..e73af709cb7a 100644 --- a/arch/arm64/include/asm/exception.h +++ b/arch/arm64/include/asm/exception.h @@ -31,7 +31,7 @@ static inline unsigned long disr_to_esr(u64 disr) return esr; } -asmlinkage void handle_bad_stack(struct pt_regs *regs); +asmlinkage void __noreturn handle_bad_stack(struct pt_regs *regs); asmlinkage void el1t_64_sync_handler(struct pt_regs *regs); asmlinkage void el1t_64_irq_handler(struct pt_regs *regs); @@ -80,5 +80,5 @@ void do_el1_fpac(struct pt_regs *regs, unsigned long esr); void do_serror(struct pt_regs *regs, unsigned long esr); void do_notify_resume(struct pt_regs *regs, unsigned long thread_flags); -void panic_bad_stack(struct pt_regs *regs, unsigned long esr, unsigned long far); +void __noreturn panic_bad_stack(struct pt_regs *regs, unsigned long esr, unsigned long far); #endif /* __ASM_EXCEPTION_H */ diff --git a/arch/arm64/include/asm/smp.h b/arch/arm64/include/asm/smp.h index fc55f5a57a06..f2d26235bfb4 100644 --- a/arch/arm64/include/asm/smp.h +++ b/arch/arm64/include/asm/smp.h @@ -100,10 +100,10 @@ static inline void arch_send_wakeup_ipi_mask(const struct cpumask *mask) extern int __cpu_disable(void); extern void __cpu_die(unsigned int cpu); -extern void cpu_die(void); -extern void cpu_die_early(void); +extern void __noreturn cpu_die(void); +extern void __noreturn cpu_die_early(void); -static inline void cpu_park_loop(void) +static inline void __noreturn cpu_park_loop(void) { for (;;) { wfe(); @@ -123,7 +123,7 @@ static inline void update_cpu_boot_status(int val) * which calls for a kernel panic. Update the boot status and park the calling * CPU. */ -static inline void cpu_panic_kernel(void) +static inline void __noreturn cpu_panic_kernel(void) { update_cpu_boot_status(CPU_PANIC_KERNEL); cpu_park_loop(); @@ -143,7 +143,6 @@ bool cpus_are_stuck_in_kernel(void); extern void crash_smp_send_stop(void); extern bool smp_crash_stop_failed(void); -extern void panic_smp_self_stop(void); #endif /* ifndef __ASSEMBLY__ */ diff --git a/arch/arm64/kernel/entry-common.c b/arch/arm64/kernel/entry-common.c index cce1167199e3..3af3c01c93a6 100644 --- a/arch/arm64/kernel/entry-common.c +++ b/arch/arm64/kernel/entry-common.c @@ -840,7 +840,7 @@ UNHANDLED(el0t, 32, error) #endif /* CONFIG_COMPAT */ #ifdef CONFIG_VMAP_STACK -asmlinkage void noinstr handle_bad_stack(struct pt_regs *regs) +asmlinkage void noinstr __noreturn handle_bad_stack(struct pt_regs *regs) { unsigned long esr = read_sysreg(esr_el1); unsigned long far = read_sysreg(far_el1); diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c index b5bed62483cb..0fcc4eb1a7ab 100644 --- a/arch/arm64/kernel/process.c +++ b/arch/arm64/kernel/process.c @@ -69,7 +69,7 @@ void (*pm_power_off)(void); EXPORT_SYMBOL_GPL(pm_power_off); #ifdef CONFIG_HOTPLUG_CPU -void arch_cpu_idle_dead(void) +void __noreturn arch_cpu_idle_dead(void) { cpu_die(); } diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index 4e8327264255..05fe797e4203 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -361,7 +361,7 @@ void __cpu_die(unsigned int cpu) * Called from the idle thread for the CPU which has been shutdown. * */ -void cpu_die(void) +void __noreturn cpu_die(void) { unsigned int cpu = smp_processor_id(); const struct cpu_operations *ops = get_cpu_ops(cpu); @@ -398,7 +398,7 @@ static void __cpu_try_die(int cpu) * Kill the calling secondary CPU, early in bringup before it is turned * online. */ -void cpu_die_early(void) +void __noreturn cpu_die_early(void) { int cpu = smp_processor_id(); @@ -816,7 +816,7 @@ void arch_irq_work_raise(void) } #endif -static void local_cpu_stop(void) +static void __noreturn local_cpu_stop(void) { set_cpu_online(smp_processor_id(), false); @@ -830,7 +830,7 @@ static void local_cpu_stop(void) * that cpu_online_mask gets correctly updated and smp_send_stop() can skip * CPUs that have already stopped themselves. */ -void panic_smp_self_stop(void) +void __noreturn panic_smp_self_stop(void) { local_cpu_stop(); } @@ -839,7 +839,7 @@ void panic_smp_self_stop(void) static atomic_t waiting_for_crash_ipi = ATOMIC_INIT(0); #endif -static void ipi_cpu_crash_stop(unsigned int cpu, struct pt_regs *regs) +static void __noreturn ipi_cpu_crash_stop(unsigned int cpu, struct pt_regs *regs) { #ifdef CONFIG_KEXEC_CORE crash_save_cpu(regs, cpu); @@ -854,6 +854,8 @@ static void ipi_cpu_crash_stop(unsigned int cpu, struct pt_regs *regs) /* just in case */ cpu_park_loop(); +#else + BUG(); #endif } diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c index 4a79ba100799..4bb1b8f47298 100644 --- a/arch/arm64/kernel/traps.c +++ b/arch/arm64/kernel/traps.c @@ -863,7 +863,7 @@ void bad_el0_sync(struct pt_regs *regs, int reason, unsigned long esr) DEFINE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)], overflow_stack) __aligned(16); -void panic_bad_stack(struct pt_regs *regs, unsigned long esr, unsigned long far) +void __noreturn panic_bad_stack(struct pt_regs *regs, unsigned long esr, unsigned long far) { unsigned long tsk_stk = (unsigned long)current->stack; unsigned long irq_stk = (unsigned long)this_cpu_read(irq_stack_ptr); @@ -905,7 +905,6 @@ void __noreturn arm64_serror_panic(struct pt_regs *regs, unsigned long esr) nmi_panic(regs, "Asynchronous SError Interrupt"); cpu_park_loop(); - unreachable(); } bool arm64_is_fatal_ras_serror(struct pt_regs *regs, unsigned long esr) diff --git a/arch/csky/kernel/smp.c b/arch/csky/kernel/smp.c index b45d1073307f..9c7a20b73ac6 100644 --- a/arch/csky/kernel/smp.c +++ b/arch/csky/kernel/smp.c @@ -300,7 +300,7 @@ void __cpu_die(unsigned int cpu) pr_notice("CPU%u: shutdown\n", cpu); } -void arch_cpu_idle_dead(void) +void __noreturn arch_cpu_idle_dead(void) { idle_task_exit(); @@ -317,5 +317,7 @@ void arch_cpu_idle_dead(void) "jmpi csky_start_secondary" : : "r" (secondary_stack)); + + BUG(); } #endif diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c index f6195a0a00ae..9a5cd9fad3a9 100644 --- a/arch/ia64/kernel/process.c +++ b/arch/ia64/kernel/process.c @@ -201,7 +201,7 @@ __setup("nohalt", nohalt_setup); #ifdef CONFIG_HOTPLUG_CPU /* We don't actually take CPU down, just spin without interrupts. */ -static inline void play_dead(void) +static inline void __noreturn play_dead(void) { unsigned int this_cpu = smp_processor_id(); @@ -219,13 +219,13 @@ static inline void play_dead(void) BUG(); } #else -static inline void play_dead(void) +static inline void __noreturn play_dead(void) { BUG(); } #endif /* CONFIG_HOTPLUG_CPU */ -void arch_cpu_idle_dead(void) +void __noreturn arch_cpu_idle_dead(void) { play_dead(); } diff --git a/arch/loongarch/include/asm/smp.h b/arch/loongarch/include/asm/smp.h index d82687390b4a..416b653bccb4 100644 --- a/arch/loongarch/include/asm/smp.h +++ b/arch/loongarch/include/asm/smp.h @@ -99,7 +99,7 @@ static inline void __cpu_die(unsigned int cpu) loongson_cpu_die(cpu); } -extern void play_dead(void); +extern void __noreturn play_dead(void); #endif #endif /* __ASM_SMP_H */ diff --git a/arch/loongarch/kernel/process.c b/arch/loongarch/kernel/process.c index fa2443c7afb2..b71e17c1cc0c 100644 --- a/arch/loongarch/kernel/process.c +++ b/arch/loongarch/kernel/process.c @@ -62,7 +62,7 @@ unsigned long boot_option_idle_override = IDLE_NO_OVERRIDE; EXPORT_SYMBOL(boot_option_idle_override); #ifdef CONFIG_HOTPLUG_CPU -void arch_cpu_idle_dead(void) +void __noreturn arch_cpu_idle_dead(void) { play_dead(); } diff --git a/arch/loongarch/kernel/smp.c b/arch/loongarch/kernel/smp.c index 8c6e227cb29d..51f328169a7b 100644 --- a/arch/loongarch/kernel/smp.c +++ b/arch/loongarch/kernel/smp.c @@ -336,7 +336,7 @@ void play_dead(void) iocsr_write32(0xffffffff, LOONGARCH_IOCSR_IPI_CLEAR); init_fn(); - unreachable(); + BUG(); } #endif diff --git a/arch/mips/cavium-octeon/smp.c b/arch/mips/cavium-octeon/smp.c index 89954f5f87fb..4212584e6efa 100644 --- a/arch/mips/cavium-octeon/smp.c +++ b/arch/mips/cavium-octeon/smp.c @@ -20,6 +20,7 @@ #include <asm/mmu_context.h> #include <asm/time.h> #include <asm/setup.h> +#include <asm/smp.h> #include <asm/octeon/octeon.h> diff --git a/arch/mips/include/asm/smp.h b/arch/mips/include/asm/smp.h index 5d9ff61004ca..4eee29b7845c 100644 --- a/arch/mips/include/asm/smp.h +++ b/arch/mips/include/asm/smp.h @@ -88,7 +88,7 @@ static inline void __cpu_die(unsigned int cpu) mp_ops->cpu_die(cpu); } -extern void play_dead(void); +extern void __noreturn play_dead(void); #endif #ifdef CONFIG_KEXEC diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c index 093dbbd6b843..a3225912c862 100644 --- a/arch/mips/kernel/process.c +++ b/arch/mips/kernel/process.c @@ -40,7 +40,7 @@ #include <asm/stacktrace.h> #ifdef CONFIG_HOTPLUG_CPU -void arch_cpu_idle_dead(void) +void __noreturn arch_cpu_idle_dead(void) { play_dead(); } diff --git a/arch/mips/kernel/smp-bmips.c b/arch/mips/kernel/smp-bmips.c index f5d7bfa3472a..15466d4cf4a0 100644 --- a/arch/mips/kernel/smp-bmips.c +++ b/arch/mips/kernel/smp-bmips.c @@ -54,6 +54,8 @@ static void bmips_set_reset_vec(int cpu, u32 val); #ifdef CONFIG_SMP +#include <asm/smp.h> + /* initial $sp, $gp - used by arch/mips/kernel/bmips_vec.S */ unsigned long bmips_smp_boot_sp; unsigned long bmips_smp_boot_gp; @@ -413,6 +415,8 @@ void __ref play_dead(void) " wait\n" " j bmips_secondary_reentry\n" : : : "memory"); + + BUG(); } #endif /* CONFIG_HOTPLUG_CPU */ diff --git a/arch/mips/kernel/smp-cps.c b/arch/mips/kernel/smp-cps.c index f968a319d87f..62f677b2306f 100644 --- a/arch/mips/kernel/smp-cps.c +++ b/arch/mips/kernel/smp-cps.c @@ -20,6 +20,7 @@ #include <asm/mipsregs.h> #include <asm/pm-cps.h> #include <asm/r4kcache.h> +#include <asm/smp.h> #include <asm/smp-cps.h> #include <asm/time.h> #include <asm/uasm.h> diff --git a/arch/mips/loongson64/smp.c b/arch/mips/loongson64/smp.c index 90c783981197..b0e8bb9fa036 100644 --- a/arch/mips/loongson64/smp.c +++ b/arch/mips/loongson64/smp.c @@ -14,6 +14,7 @@ #include <linux/cpufreq.h> #include <linux/kexec.h> #include <asm/processor.h> +#include <asm/smp.h> #include <asm/time.h> #include <asm/tlbflush.h> #include <asm/cacheflush.h> @@ -808,6 +809,7 @@ out: state_addr = &per_cpu(cpu_state, cpu); mb(); play_dead_at_ckseg1(state_addr); + BUG(); } static int loongson3_disable_clock(unsigned int cpu) diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c index c064719b49b0..97c6f875bd0e 100644 --- a/arch/parisc/kernel/process.c +++ b/arch/parisc/kernel/process.c @@ -159,7 +159,7 @@ EXPORT_SYMBOL(running_on_qemu); /* * Called from the idle thread for the CPU which has been shutdown. */ -void arch_cpu_idle_dead(void) +void __noreturn arch_cpu_idle_dead(void) { #ifdef CONFIG_HOTPLUG_CPU idle_task_exit(); diff --git a/arch/powerpc/include/asm/smp.h b/arch/powerpc/include/asm/smp.h index 6c6cb53d7045..aaaa576d0e15 100644 --- a/arch/powerpc/include/asm/smp.h +++ b/arch/powerpc/include/asm/smp.h @@ -67,7 +67,7 @@ void start_secondary(void *unused); extern int smp_send_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us); extern int smp_send_safe_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us); extern void smp_send_debugger_break(void); -extern void start_secondary_resume(void); +extern void __noreturn start_secondary_resume(void); extern void smp_generic_give_timebase(void); extern void smp_generic_take_timebase(void); diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c index b2e0d3ce4261..246201d0d879 100644 --- a/arch/powerpc/kernel/setup_64.c +++ b/arch/powerpc/kernel/setup_64.c @@ -480,7 +480,7 @@ void early_setup_secondary(void) #endif /* CONFIG_SMP */ -void panic_smp_self_stop(void) +void __noreturn panic_smp_self_stop(void) { hard_irq_disable(); spin_begin(); diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c index 7db6b3faea65..bf9744034c3a 100644 --- a/arch/powerpc/kernel/smp.c +++ b/arch/powerpc/kernel/smp.c @@ -1752,7 +1752,7 @@ void __cpu_die(unsigned int cpu) smp_ops->cpu_die(cpu); } -void arch_cpu_idle_dead(void) +void __noreturn arch_cpu_idle_dead(void) { /* * Disable on the down path. This will be re-enabled by diff --git a/arch/riscv/kernel/cpu-hotplug.c b/arch/riscv/kernel/cpu-hotplug.c index 39235cf50652..a941adc7cbf2 100644 --- a/arch/riscv/kernel/cpu-hotplug.c +++ b/arch/riscv/kernel/cpu-hotplug.c @@ -72,7 +72,7 @@ void __cpu_die(unsigned int cpu) /* * Called from the idle thread for the CPU which has been shutdown. */ -void arch_cpu_idle_dead(void) +void __noreturn arch_cpu_idle_dead(void) { idle_task_exit(); diff --git a/arch/s390/kernel/idle.c b/arch/s390/kernel/idle.c index 38e267c7bff7..e7239aaf428b 100644 --- a/arch/s390/kernel/idle.c +++ b/arch/s390/kernel/idle.c @@ -88,7 +88,7 @@ void arch_cpu_idle_exit(void) { } -void arch_cpu_idle_dead(void) +void __noreturn arch_cpu_idle_dead(void) { cpu_die(); } diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index 8ec5cdf9dadc..4259b6c50516 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -396,7 +396,7 @@ int __init arch_early_irq_init(void) return 0; } -void __init arch_call_rest_init(void) +void __init __noreturn arch_call_rest_init(void) { unsigned long stack; diff --git a/arch/sh/include/asm/smp-ops.h b/arch/sh/include/asm/smp-ops.h index e27702130eb6..97331fcb7b85 100644 --- a/arch/sh/include/asm/smp-ops.h +++ b/arch/sh/include/asm/smp-ops.h @@ -24,9 +24,10 @@ static inline void plat_smp_setup(void) mp_ops->smp_setup(); } -static inline void play_dead(void) +static inline void __noreturn play_dead(void) { mp_ops->play_dead(); + BUG(); } extern void register_smp_ops(struct plat_smp_ops *ops); @@ -42,7 +43,7 @@ static inline void register_smp_ops(struct plat_smp_ops *ops) { } -static inline void play_dead(void) +static inline void __noreturn play_dead(void) { BUG(); } diff --git a/arch/sh/kernel/idle.c b/arch/sh/kernel/idle.c index 3418c40f0099..d662503b0665 100644 --- a/arch/sh/kernel/idle.c +++ b/arch/sh/kernel/idle.c @@ -4,6 +4,7 @@ * * Copyright (C) 2002 - 2009 Paul Mundt */ +#include <linux/cpu.h> #include <linux/module.h> #include <linux/init.h> #include <linux/mm.h> @@ -29,7 +30,7 @@ void default_idle(void) clear_bl_bit(); } -void arch_cpu_idle_dead(void) +void __noreturn arch_cpu_idle_dead(void) { play_dead(); } diff --git a/arch/sparc/include/asm/smp_64.h b/arch/sparc/include/asm/smp_64.h index e75783b6abc4..505b6700805d 100644 --- a/arch/sparc/include/asm/smp_64.h +++ b/arch/sparc/include/asm/smp_64.h @@ -49,7 +49,7 @@ int hard_smp_processor_id(void); void smp_fill_in_cpu_possible_map(void); void smp_fill_in_sib_core_maps(void); -void cpu_play_dead(void); +void __noreturn cpu_play_dead(void); void smp_fetch_global_regs(void); void smp_fetch_global_pmu(void); diff --git a/arch/sparc/kernel/process_64.c b/arch/sparc/kernel/process_64.c index 91c2b8124527..b51d8fb0ecdc 100644 --- a/arch/sparc/kernel/process_64.c +++ b/arch/sparc/kernel/process_64.c @@ -95,7 +95,7 @@ void arch_cpu_idle(void) } #ifdef CONFIG_HOTPLUG_CPU -void arch_cpu_idle_dead(void) +void __noreturn arch_cpu_idle_dead(void) { sched_preempt_enable_no_resched(); cpu_play_dead(); diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index 1b1136c024df..f31e286c2977 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -205,7 +205,7 @@ syscall_return_via_sysret: */ movq %rsp, %rdi movq PER_CPU_VAR(cpu_tss_rw + TSS_sp0), %rsp - UNWIND_HINT_EMPTY + UNWIND_HINT_END_OF_STACK pushq RSP-RDI(%rdi) /* RSP */ pushq (%rdi) /* RDI */ @@ -286,7 +286,7 @@ SYM_FUNC_END(__switch_to_asm) .pushsection .text, "ax" __FUNC_ALIGN SYM_CODE_START_NOALIGN(ret_from_fork) - UNWIND_HINT_EMPTY + UNWIND_HINT_END_OF_STACK ANNOTATE_NOENDBR // copy_thread CALL_DEPTH_ACCOUNT movq %rax, %rdi @@ -303,7 +303,7 @@ SYM_CODE_START_NOALIGN(ret_from_fork) 1: /* kernel thread */ - UNWIND_HINT_EMPTY + UNWIND_HINT_END_OF_STACK movq %r12, %rdi CALL_NOSPEC rbx /* @@ -388,9 +388,9 @@ SYM_CODE_START(\asmsym) .if \vector == X86_TRAP_BP /* #BP advances %rip to the next instruction */ - UNWIND_HINT_IRET_REGS offset=\has_error_code*8 signal=0 + UNWIND_HINT_IRET_ENTRY offset=\has_error_code*8 signal=0 .else - UNWIND_HINT_IRET_REGS offset=\has_error_code*8 + UNWIND_HINT_IRET_ENTRY offset=\has_error_code*8 .endif ENDBR @@ -461,7 +461,7 @@ SYM_CODE_END(\asmsym) */ .macro idtentry_mce_db vector asmsym cfunc SYM_CODE_START(\asmsym) - UNWIND_HINT_IRET_REGS + UNWIND_HINT_IRET_ENTRY ENDBR ASM_CLAC cld @@ -518,7 +518,7 @@ SYM_CODE_END(\asmsym) */ .macro idtentry_vc vector asmsym cfunc SYM_CODE_START(\asmsym) - UNWIND_HINT_IRET_REGS + UNWIND_HINT_IRET_ENTRY ENDBR ASM_CLAC cld @@ -582,7 +582,7 @@ SYM_CODE_END(\asmsym) */ .macro idtentry_df vector asmsym cfunc SYM_CODE_START(\asmsym) - UNWIND_HINT_IRET_REGS offset=8 + UNWIND_HINT_IRET_ENTRY offset=8 ENDBR ASM_CLAC cld @@ -643,7 +643,7 @@ SYM_INNER_LABEL(swapgs_restore_regs_and_return_to_usermode, SYM_L_GLOBAL) */ movq %rsp, %rdi movq PER_CPU_VAR(cpu_tss_rw + TSS_sp0), %rsp - UNWIND_HINT_EMPTY + UNWIND_HINT_END_OF_STACK /* Copy the IRET frame to the trampoline stack. */ pushq 6*8(%rdi) /* SS */ @@ -869,7 +869,7 @@ SYM_CODE_END(exc_xen_hypervisor_callback) */ __FUNC_ALIGN SYM_CODE_START_NOALIGN(xen_failsafe_callback) - UNWIND_HINT_EMPTY + UNWIND_HINT_UNDEFINED ENDBR movl %ds, %ecx cmpw %cx, 0x10(%rsp) @@ -1107,7 +1107,7 @@ SYM_CODE_START(error_entry) FENCE_SWAPGS_KERNEL_ENTRY CALL_DEPTH_ACCOUNT leaq 8(%rsp), %rax /* return pt_regs pointer */ - ANNOTATE_UNRET_END + VALIDATE_UNRET_END RET .Lbstep_iret: @@ -1153,7 +1153,7 @@ SYM_CODE_END(error_return) * when PAGE_TABLE_ISOLATION is in use. Do not clobber. */ SYM_CODE_START(asm_exc_nmi) - UNWIND_HINT_IRET_REGS + UNWIND_HINT_IRET_ENTRY ENDBR /* @@ -1520,7 +1520,7 @@ SYM_CODE_END(asm_exc_nmi) * MSRs to fully disable 32-bit SYSCALL. */ SYM_CODE_START(ignore_sysret) - UNWIND_HINT_EMPTY + UNWIND_HINT_END_OF_STACK ENDBR mov $-ENOSYS, %eax sysretl diff --git a/arch/x86/hyperv/ivm.c b/arch/x86/hyperv/ivm.c index 127d5b7b63de..cc92388b7a99 100644 --- a/arch/x86/hyperv/ivm.c +++ b/arch/x86/hyperv/ivm.c @@ -129,7 +129,7 @@ static enum es_result hv_ghcb_hv_call(struct ghcb *ghcb, u64 exit_code, return ES_OK; } -void hv_ghcb_terminate(unsigned int set, unsigned int reason) +void __noreturn hv_ghcb_terminate(unsigned int set, unsigned int reason) { u64 val = GHCB_MSR_TERM_REQ; diff --git a/arch/x86/include/asm/linkage.h b/arch/x86/include/asm/linkage.h index dd9b8118f784..0953aa32a324 100644 --- a/arch/x86/include/asm/linkage.h +++ b/arch/x86/include/asm/linkage.h @@ -99,7 +99,7 @@ /* SYM_TYPED_FUNC_START -- use for indirectly called globals, w/ CFI type */ #define SYM_TYPED_FUNC_START(name) \ - SYM_TYPED_START(name, SYM_L_GLOBAL, SYM_A_ALIGN) \ + SYM_TYPED_START(name, SYM_L_GLOBAL, SYM_F_ALIGN) \ ENDBR /* SYM_FUNC_START -- use for global functions */ diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index b445e252aa83..49bb4f2bd300 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -228,7 +228,7 @@ int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry); void hv_ghcb_msr_write(u64 msr, u64 value); void hv_ghcb_msr_read(u64 msr, u64 *value); bool hv_ghcb_negotiate_protocol(void); -void hv_ghcb_terminate(unsigned int set, unsigned int reason); +void __noreturn hv_ghcb_terminate(unsigned int set, unsigned int reason); void hv_vtom_init(void); #else static inline void hv_ghcb_msr_write(u64 msr, u64 value) {} diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h index 3ef70e54a858..edb2b0cb8efe 100644 --- a/arch/x86/include/asm/nospec-branch.h +++ b/arch/x86/include/asm/nospec-branch.h @@ -194,9 +194,9 @@ * builds. */ .macro ANNOTATE_RETPOLINE_SAFE - .Lannotate_\@: +.Lhere_\@: .pushsection .discard.retpoline_safe - _ASM_PTR .Lannotate_\@ + .long .Lhere_\@ - . .popsection .endm @@ -210,8 +210,8 @@ * Abuse ANNOTATE_RETPOLINE_SAFE on a NOP to indicate UNRET_END, should * eventually turn into it's own annotation. */ -.macro ANNOTATE_UNRET_END -#ifdef CONFIG_DEBUG_ENTRY +.macro VALIDATE_UNRET_END +#if defined(CONFIG_NOINSTR_VALIDATION) && defined(CONFIG_CPU_UNRET_ENTRY) ANNOTATE_RETPOLINE_SAFE nop #endif @@ -286,7 +286,7 @@ .macro UNTRAIN_RET #if defined(CONFIG_CPU_UNRET_ENTRY) || defined(CONFIG_CPU_IBPB_ENTRY) || \ defined(CONFIG_CALL_DEPTH_TRACKING) - ANNOTATE_UNRET_END + VALIDATE_UNRET_END ALTERNATIVE_3 "", \ CALL_ZEN_UNTRAIN_RET, X86_FEATURE_UNRET, \ "call entry_ibpb", X86_FEATURE_ENTRY_IBPB, \ @@ -297,7 +297,7 @@ .macro UNTRAIN_RET_FROM_CALL #if defined(CONFIG_CPU_UNRET_ENTRY) || defined(CONFIG_CPU_IBPB_ENTRY) || \ defined(CONFIG_CALL_DEPTH_TRACKING) - ANNOTATE_UNRET_END + VALIDATE_UNRET_END ALTERNATIVE_3 "", \ CALL_ZEN_UNTRAIN_RET, X86_FEATURE_UNRET, \ "call entry_ibpb", X86_FEATURE_ENTRY_IBPB, \ @@ -318,7 +318,7 @@ #define ANNOTATE_RETPOLINE_SAFE \ "999:\n\t" \ ".pushsection .discard.retpoline_safe\n\t" \ - _ASM_PTR " 999b\n\t" \ + ".long 999b - .\n\t" \ ".popsection\n\t" typedef u8 retpoline_thunk_t[RETPOLINE_THUNK_SIZE]; diff --git a/arch/x86/include/asm/orc_types.h b/arch/x86/include/asm/orc_types.h index 1343a62106de..46d7e06763c9 100644 --- a/arch/x86/include/asm/orc_types.h +++ b/arch/x86/include/asm/orc_types.h @@ -39,6 +39,12 @@ #define ORC_REG_SP_INDIRECT 9 #define ORC_REG_MAX 15 +#define ORC_TYPE_UNDEFINED 0 +#define ORC_TYPE_END_OF_STACK 1 +#define ORC_TYPE_CALL 2 +#define ORC_TYPE_REGS 3 +#define ORC_TYPE_REGS_PARTIAL 4 + #ifndef __ASSEMBLY__ #include <asm/byteorder.h> @@ -56,16 +62,14 @@ struct orc_entry { #if defined(__LITTLE_ENDIAN_BITFIELD) unsigned sp_reg:4; unsigned bp_reg:4; - unsigned type:2; + unsigned type:3; unsigned signal:1; - unsigned end:1; #elif defined(__BIG_ENDIAN_BITFIELD) unsigned bp_reg:4; unsigned sp_reg:4; unsigned unused:4; - unsigned end:1; unsigned signal:1; - unsigned type:2; + unsigned type:3; #endif } __packed; diff --git a/arch/x86/include/asm/reboot.h b/arch/x86/include/asm/reboot.h index bc5b4d788c08..9177b4354c3f 100644 --- a/arch/x86/include/asm/reboot.h +++ b/arch/x86/include/asm/reboot.h @@ -28,7 +28,6 @@ void __noreturn machine_real_restart(unsigned int type); void cpu_emergency_disable_virtualization(void); typedef void (*nmi_shootdown_cb)(int, struct pt_regs*); -void nmi_panic_self_stop(struct pt_regs *regs); void nmi_shootdown_cpus(nmi_shootdown_cb callback); void run_crash_ipi_callback(struct pt_regs *regs); diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h index f37cbff7354c..f3495623ac99 100644 --- a/arch/x86/include/asm/setup.h +++ b/arch/x86/include/asm/setup.h @@ -125,11 +125,11 @@ void clear_bss(void); #ifdef __i386__ -asmlinkage void __init i386_start_kernel(void); +asmlinkage void __init __noreturn i386_start_kernel(void); #else -asmlinkage void __init x86_64_start_kernel(char *real_mode); -asmlinkage void __init x86_64_start_reservations(char *real_mode_data); +asmlinkage void __init __noreturn x86_64_start_kernel(char *real_mode); +asmlinkage void __init __noreturn x86_64_start_reservations(char *real_mode_data); #endif /* __i386__ */ #endif /* _SETUP */ diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h index bf2c51df9e0b..9fa795102b93 100644 --- a/arch/x86/include/asm/smp.h +++ b/arch/x86/include/asm/smp.h @@ -93,9 +93,10 @@ static inline void __cpu_die(unsigned int cpu) smp_ops.cpu_die(cpu); } -static inline void play_dead(void) +static inline void __noreturn play_dead(void) { smp_ops.play_dead(); + BUG(); } static inline void smp_send_reschedule(int cpu) @@ -124,7 +125,7 @@ int native_cpu_up(unsigned int cpunum, struct task_struct *tidle); int native_cpu_disable(void); int common_cpu_die(unsigned int cpu); void native_cpu_die(unsigned int cpu); -void hlt_play_dead(void); +void __noreturn hlt_play_dead(void); void native_play_dead(void); void play_dead_common(void); void wbinvd_on_cpu(int cpu); diff --git a/arch/x86/include/asm/unwind_hints.h b/arch/x86/include/asm/unwind_hints.h index e7c71750b309..01cb9692b160 100644 --- a/arch/x86/include/asm/unwind_hints.h +++ b/arch/x86/include/asm/unwind_hints.h @@ -7,12 +7,17 @@ #ifdef __ASSEMBLY__ -.macro UNWIND_HINT_EMPTY - UNWIND_HINT type=UNWIND_HINT_TYPE_CALL end=1 +.macro UNWIND_HINT_END_OF_STACK + UNWIND_HINT type=UNWIND_HINT_TYPE_END_OF_STACK +.endm + +.macro UNWIND_HINT_UNDEFINED + UNWIND_HINT type=UNWIND_HINT_TYPE_UNDEFINED .endm .macro UNWIND_HINT_ENTRY - UNWIND_HINT type=UNWIND_HINT_TYPE_ENTRY end=1 + VALIDATE_UNRET_BEGIN + UNWIND_HINT_END_OF_STACK .endm .macro UNWIND_HINT_REGS base=%rsp offset=0 indirect=0 extra=1 partial=0 signal=1 @@ -52,6 +57,11 @@ UNWIND_HINT_REGS base=\base offset=\offset partial=1 signal=\signal .endm +.macro UNWIND_HINT_IRET_ENTRY base=%rsp offset=0 signal=1 + VALIDATE_UNRET_BEGIN + UNWIND_HINT_IRET_REGS base=\base offset=\offset signal=\signal +.endm + .macro UNWIND_HINT_FUNC UNWIND_HINT sp_reg=ORC_REG_SP sp_offset=8 type=UNWIND_HINT_TYPE_FUNC .endm @@ -67,7 +77,7 @@ #else #define UNWIND_HINT_FUNC \ - UNWIND_HINT(ORC_REG_SP, 8, UNWIND_HINT_TYPE_FUNC, 0, 0) + UNWIND_HINT(UNWIND_HINT_TYPE_FUNC, ORC_REG_SP, 8, 0) #endif /* __ASSEMBLY__ */ diff --git a/arch/x86/kernel/ftrace_64.S b/arch/x86/kernel/ftrace_64.S index 970d8445fdc4..b8c720b5dab2 100644 --- a/arch/x86/kernel/ftrace_64.S +++ b/arch/x86/kernel/ftrace_64.S @@ -346,7 +346,7 @@ STACK_FRAME_NON_STANDARD_FP(__fentry__) #ifdef CONFIG_FUNCTION_GRAPH_TRACER SYM_CODE_START(return_to_handler) - UNWIND_HINT_EMPTY + UNWIND_HINT_UNDEFINED ANNOTATE_NOENDBR subq $16, %rsp diff --git a/arch/x86/kernel/head32.c b/arch/x86/kernel/head32.c index ec6fefbfd3c0..10c27b4261eb 100644 --- a/arch/x86/kernel/head32.c +++ b/arch/x86/kernel/head32.c @@ -29,7 +29,7 @@ static void __init i386_default_early_setup(void) x86_init.mpparse.setup_ioapic_ids = setup_ioapic_ids_from_mpc; } -asmlinkage __visible void __init i386_start_kernel(void) +asmlinkage __visible void __init __noreturn i386_start_kernel(void) { /* Make sure IDT is set up before any exception happens */ idt_setup_early_handler(); diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c index 387e4b12e823..49f7629b17f7 100644 --- a/arch/x86/kernel/head64.c +++ b/arch/x86/kernel/head64.c @@ -471,7 +471,7 @@ static void __init copy_bootdata(char *real_mode_data) sme_unmap_bootdata(real_mode_data); } -asmlinkage __visible void __init x86_64_start_kernel(char * real_mode_data) +asmlinkage __visible void __init __noreturn x86_64_start_kernel(char * real_mode_data) { /* * Build-time sanity checks on the kernel image and module @@ -537,7 +537,7 @@ asmlinkage __visible void __init x86_64_start_kernel(char * real_mode_data) x86_64_start_reservations(real_mode_data); } -void __init x86_64_start_reservations(char *real_mode_data) +void __init __noreturn x86_64_start_reservations(char *real_mode_data) { /* version is always not zero if it is copied */ if (!boot_params.hdr.version) diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S index 6a8238702eab..a5df3e994f04 100644 --- a/arch/x86/kernel/head_64.S +++ b/arch/x86/kernel/head_64.S @@ -42,7 +42,7 @@ L3_START_KERNEL = pud_index(__START_KERNEL_map) __HEAD .code64 SYM_CODE_START_NOALIGN(startup_64) - UNWIND_HINT_EMPTY + UNWIND_HINT_END_OF_STACK /* * At this point the CPU runs in 64bit mode CS.L = 1 CS.D = 0, * and someone has loaded an identity mapped page table @@ -97,7 +97,7 @@ SYM_CODE_START_NOALIGN(startup_64) lretq .Lon_kernel_cs: - UNWIND_HINT_EMPTY + UNWIND_HINT_END_OF_STACK /* Sanitize CPU configuration */ call verify_cpu @@ -119,7 +119,7 @@ SYM_CODE_START_NOALIGN(startup_64) SYM_CODE_END(startup_64) SYM_CODE_START(secondary_startup_64) - UNWIND_HINT_EMPTY + UNWIND_HINT_END_OF_STACK ANNOTATE_NOENDBR /* * At this point the CPU runs in 64bit mode CS.L = 1 CS.D = 0, @@ -148,7 +148,7 @@ SYM_CODE_START(secondary_startup_64) * verify_cpu() above to make sure NX is enabled. */ SYM_INNER_LABEL(secondary_startup_64_no_verify, SYM_L_GLOBAL) - UNWIND_HINT_EMPTY + UNWIND_HINT_END_OF_STACK ANNOTATE_NOENDBR /* @@ -230,7 +230,7 @@ SYM_INNER_LABEL(secondary_startup_64_no_verify, SYM_L_GLOBAL) ANNOTATE_RETPOLINE_SAFE jmp *%rax 1: - UNWIND_HINT_EMPTY + UNWIND_HINT_END_OF_STACK ANNOTATE_NOENDBR // above #ifdef CONFIG_SMP @@ -383,7 +383,7 @@ SYM_CODE_END(secondary_startup_64) */ SYM_CODE_START(start_cpu0) ANNOTATE_NOENDBR - UNWIND_HINT_EMPTY + UNWIND_HINT_END_OF_STACK /* Find the idle task stack */ movq PER_CPU_VAR(pcpu_hot) + X86_current_task, %rcx @@ -406,8 +406,6 @@ SYM_CODE_START_NOALIGN(vc_boot_ghcb) UNWIND_HINT_IRET_REGS offset=8 ENDBR - ANNOTATE_UNRET_END - /* Build pt_regs */ PUSH_AND_CLEAR_REGS @@ -460,7 +458,6 @@ SYM_CODE_END(early_idt_handler_array) SYM_CODE_START_LOCAL(early_idt_handler_common) UNWIND_HINT_IRET_REGS offset=16 - ANNOTATE_UNRET_END /* * The stack is the hardware frame, an error code or zero, and the * vector number. @@ -510,8 +507,6 @@ SYM_CODE_START_NOALIGN(vc_no_ghcb) UNWIND_HINT_IRET_REGS offset=8 ENDBR - ANNOTATE_UNRET_END - /* Build pt_regs */ PUSH_AND_CLEAR_REGS diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index 50d950771371..dac41a0072ea 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -5,6 +5,7 @@ #include <linux/kernel.h> #include <linux/mm.h> #include <linux/smp.h> +#include <linux/cpu.h> #include <linux/prctl.h> #include <linux/slab.h> #include <linux/sched.h> @@ -721,7 +722,7 @@ static bool x86_idle_set(void) } #ifndef CONFIG_SMP -static inline void play_dead(void) +static inline void __noreturn play_dead(void) { BUG(); } @@ -733,7 +734,7 @@ void arch_cpu_idle_enter(void) local_touch_nmi(); } -void arch_cpu_idle_dead(void) +void __noreturn arch_cpu_idle_dead(void) { play_dead(); } diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c index d03c551defcc..3adbe97015c1 100644 --- a/arch/x86/kernel/reboot.c +++ b/arch/x86/kernel/reboot.c @@ -920,7 +920,7 @@ void run_crash_ipi_callback(struct pt_regs *regs) } /* Override the weak function in kernel/panic.c */ -void nmi_panic_self_stop(struct pt_regs *regs) +void __noreturn nmi_panic_self_stop(struct pt_regs *regs) { while (1) { /* If no CPU is preparing crash dump, we simply loop here. */ diff --git a/arch/x86/kernel/relocate_kernel_64.S b/arch/x86/kernel/relocate_kernel_64.S index 4a73351f87f8..56cab1bb25f5 100644 --- a/arch/x86/kernel/relocate_kernel_64.S +++ b/arch/x86/kernel/relocate_kernel_64.S @@ -43,7 +43,7 @@ .code64 SYM_CODE_START_NOALIGN(relocate_range) SYM_CODE_START_NOALIGN(relocate_kernel) - UNWIND_HINT_EMPTY + UNWIND_HINT_END_OF_STACK ANNOTATE_NOENDBR /* * %rdi indirection_page @@ -113,7 +113,7 @@ SYM_CODE_START_NOALIGN(relocate_kernel) SYM_CODE_END(relocate_kernel) SYM_CODE_START_LOCAL_NOALIGN(identity_mapped) - UNWIND_HINT_EMPTY + UNWIND_HINT_END_OF_STACK /* set return address to 0 if not preserving context */ pushq $0 /* store the start address on the stack */ @@ -231,7 +231,7 @@ SYM_CODE_START_LOCAL_NOALIGN(identity_mapped) SYM_CODE_END(identity_mapped) SYM_CODE_START_LOCAL_NOALIGN(virtual_mapped) - UNWIND_HINT_EMPTY + UNWIND_HINT_END_OF_STACK ANNOTATE_NOENDBR // RET target, above movq RSP(%r8), %rsp movq CR4(%r8), %rax @@ -256,8 +256,8 @@ SYM_CODE_END(virtual_mapped) /* Do the copies */ SYM_CODE_START_LOCAL_NOALIGN(swap_pages) - UNWIND_HINT_EMPTY - movq %rdi, %rcx /* Put the page_list in %rcx */ + UNWIND_HINT_END_OF_STACK + movq %rdi, %rcx /* Put the page_list in %rcx */ xorl %edi, %edi xorl %esi, %esi jmp 1f diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 851477f7d728..352f0ce1ece4 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -1824,7 +1824,7 @@ static inline void mwait_play_dead(void) } } -void hlt_play_dead(void) +void __noreturn hlt_play_dead(void) { if (__this_cpu_read(cpu_info.x86) >= 4) wbinvd(); diff --git a/arch/x86/kernel/unwind_orc.c b/arch/x86/kernel/unwind_orc.c index 37307b40f8da..3ac50b7298d1 100644 --- a/arch/x86/kernel/unwind_orc.c +++ b/arch/x86/kernel/unwind_orc.c @@ -133,7 +133,7 @@ static struct orc_entry null_orc_entry = { .sp_offset = sizeof(long), .sp_reg = ORC_REG_SP, .bp_reg = ORC_REG_UNDEFINED, - .type = UNWIND_HINT_TYPE_CALL + .type = ORC_TYPE_CALL }; #ifdef CONFIG_CALL_THUNKS @@ -153,12 +153,11 @@ static struct orc_entry *orc_callthunk_find(unsigned long ip) /* Fake frame pointer entry -- used as a fallback for generated code */ static struct orc_entry orc_fp_entry = { - .type = UNWIND_HINT_TYPE_CALL, + .type = ORC_TYPE_CALL, .sp_reg = ORC_REG_BP, .sp_offset = 16, .bp_reg = ORC_REG_PREV_SP, .bp_offset = -16, - .end = 0, }; static struct orc_entry *orc_find(unsigned long ip) @@ -250,13 +249,13 @@ static int orc_sort_cmp(const void *_a, const void *_b) return -1; /* - * The "weak" section terminator entries need to always be on the left + * The "weak" section terminator entries need to always be first * to ensure the lookup code skips them in favor of real entries. * These terminator entries exist to handle any gaps created by * whitelisted .o files which didn't get objtool generation. */ orc_a = cur_orc_table + (a - cur_orc_ip_table); - return orc_a->sp_reg == ORC_REG_UNDEFINED && !orc_a->end ? -1 : 1; + return orc_a->type == ORC_TYPE_UNDEFINED ? -1 : 1; } void unwind_module_init(struct module *mod, void *_orc_ip, size_t orc_ip_size, @@ -474,14 +473,12 @@ bool unwind_next_frame(struct unwind_state *state) */ orc = &orc_fp_entry; state->error = true; - } - - /* End-of-stack check for kernel threads: */ - if (orc->sp_reg == ORC_REG_UNDEFINED) { - if (!orc->end) + } else { + if (orc->type == ORC_TYPE_UNDEFINED) goto err; - goto the_end; + if (orc->type == ORC_TYPE_END_OF_STACK) + goto the_end; } state->signal = orc->signal; @@ -554,7 +551,7 @@ bool unwind_next_frame(struct unwind_state *state) /* Find IP, SP and possibly regs: */ switch (orc->type) { - case UNWIND_HINT_TYPE_CALL: + case ORC_TYPE_CALL: ip_p = sp - sizeof(long); if (!deref_stack_reg(state, ip_p, &state->ip)) @@ -567,7 +564,7 @@ bool unwind_next_frame(struct unwind_state *state) state->prev_regs = NULL; break; - case UNWIND_HINT_TYPE_REGS: + case ORC_TYPE_REGS: if (!deref_stack_regs(state, sp, &state->ip, &state->sp)) { orc_warn_current("can't access registers at %pB\n", (void *)orig_ip); @@ -590,13 +587,13 @@ bool unwind_next_frame(struct unwind_state *state) state->full_regs = true; break; - case UNWIND_HINT_TYPE_REGS_PARTIAL: + case ORC_TYPE_REGS_PARTIAL: if (!deref_stack_iret_regs(state, sp, &state->ip, &state->sp)) { orc_warn_current("can't access iret registers at %pB\n", (void *)orig_ip); goto err; } - /* See UNWIND_HINT_TYPE_REGS case comment. */ + /* See ORC_TYPE_REGS case comment. */ state->ip = unwind_recover_rethook(state, state->ip, (unsigned long *)(state->sp - sizeof(long))); diff --git a/arch/x86/lib/retpoline.S b/arch/x86/lib/retpoline.S index 5f61c65322be..27ef53fab6bd 100644 --- a/arch/x86/lib/retpoline.S +++ b/arch/x86/lib/retpoline.S @@ -33,7 +33,7 @@ .align RETPOLINE_THUNK_SIZE SYM_INNER_LABEL(__x86_indirect_thunk_\reg, SYM_L_GLOBAL) - UNWIND_HINT_EMPTY + UNWIND_HINT_UNDEFINED ANNOTATE_NOENDBR ALTERNATIVE_2 __stringify(RETPOLINE \reg), \ @@ -75,7 +75,7 @@ SYM_CODE_END(__x86_indirect_thunk_array) .align RETPOLINE_THUNK_SIZE SYM_INNER_LABEL(__x86_indirect_call_thunk_\reg, SYM_L_GLOBAL) - UNWIND_HINT_EMPTY + UNWIND_HINT_UNDEFINED ANNOTATE_NOENDBR CALL_DEPTH_ACCOUNT @@ -103,7 +103,7 @@ SYM_CODE_END(__x86_indirect_call_thunk_array) .align RETPOLINE_THUNK_SIZE SYM_INNER_LABEL(__x86_indirect_jump_thunk_\reg, SYM_L_GLOBAL) - UNWIND_HINT_EMPTY + UNWIND_HINT_UNDEFINED ANNOTATE_NOENDBR POLINE \reg ANNOTATE_UNRET_SAFE diff --git a/arch/x86/platform/pvh/head.S b/arch/x86/platform/pvh/head.S index 7fe564eaf228..c4365a05ab83 100644 --- a/arch/x86/platform/pvh/head.S +++ b/arch/x86/platform/pvh/head.S @@ -50,7 +50,7 @@ #define PVH_DS_SEL (PVH_GDT_ENTRY_DS * 8) SYM_CODE_START_LOCAL(pvh_start_xen) - UNWIND_HINT_EMPTY + UNWIND_HINT_END_OF_STACK cld lgdt (_pa(gdt)) diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c index 236447ee9beb..7a4d5e911415 100644 --- a/arch/x86/power/cpu.c +++ b/arch/x86/power/cpu.c @@ -288,7 +288,7 @@ EXPORT_SYMBOL(restore_processor_state); #endif #if defined(CONFIG_HIBERNATION) && defined(CONFIG_HOTPLUG_CPU) -static void resume_play_dead(void) +static void __noreturn resume_play_dead(void) { play_dead_common(); tboot_shutdown(TB_SHUTDOWN_WFS); diff --git a/arch/x86/xen/xen-asm.S b/arch/x86/xen/xen-asm.S index 4a184f6e4e4d..08f1ceb9eb81 100644 --- a/arch/x86/xen/xen-asm.S +++ b/arch/x86/xen/xen-asm.S @@ -165,7 +165,7 @@ xen_pv_trap asm_exc_xen_hypervisor_callback SYM_CODE_START(xen_early_idt_handler_array) i = 0 .rept NUM_EXCEPTION_VECTORS - UNWIND_HINT_EMPTY + UNWIND_HINT_UNDEFINED ENDBR pop %rcx pop %r11 @@ -193,7 +193,7 @@ hypercall_iret = hypercall_page + __HYPERVISOR_iret * 32 * rsp->rax } */ SYM_CODE_START(xen_iret) - UNWIND_HINT_EMPTY + UNWIND_HINT_UNDEFINED ANNOTATE_NOENDBR pushq $0 jmp hypercall_iret diff --git a/arch/x86/xen/xen-head.S b/arch/x86/xen/xen-head.S index 91f7a53519a7..643d02900fbb 100644 --- a/arch/x86/xen/xen-head.S +++ b/arch/x86/xen/xen-head.S @@ -45,7 +45,7 @@ SYM_CODE_END(hypercall_page) #ifdef CONFIG_XEN_PV __INIT SYM_CODE_START(startup_xen) - UNWIND_HINT_EMPTY + UNWIND_HINT_END_OF_STACK ANNOTATE_NOENDBR cld @@ -71,7 +71,7 @@ SYM_CODE_END(startup_xen) #ifdef CONFIG_XEN_PV_SMP .pushsection .text SYM_CODE_START(asm_cpu_bringup_and_idle) - UNWIND_HINT_EMPTY + UNWIND_HINT_END_OF_STACK ENDBR call cpu_bringup_and_idle diff --git a/arch/xtensa/include/asm/smp.h b/arch/xtensa/include/asm/smp.h index 4e43f5643891..5dc5bf8cdd77 100644 --- a/arch/xtensa/include/asm/smp.h +++ b/arch/xtensa/include/asm/smp.h @@ -33,7 +33,7 @@ void show_ipi_list(struct seq_file *p, int prec); void __cpu_die(unsigned int cpu); int __cpu_disable(void); -void cpu_die(void); +void __noreturn cpu_die(void); void cpu_restart(void); #endif /* CONFIG_HOTPLUG_CPU */ diff --git a/arch/xtensa/kernel/smp.c b/arch/xtensa/kernel/smp.c index 4dc109dd6214..054bd64eab19 100644 --- a/arch/xtensa/kernel/smp.c +++ b/arch/xtensa/kernel/smp.c @@ -322,7 +322,7 @@ void __cpu_die(unsigned int cpu) pr_err("CPU%u: unable to kill\n", cpu); } -void arch_cpu_idle_dead(void) +void __noreturn arch_cpu_idle_dead(void) { cpu_die(); } @@ -341,6 +341,8 @@ void __ref cpu_die(void) __asm__ __volatile__( " movi a2, cpu_restart\n" " jx a2\n"); + + BUG(); } #endif /* CONFIG_HOTPLUG_CPU */ diff --git a/drivers/message/fusion/mptbase.c b/drivers/message/fusion/mptbase.c index 9b3ba2df71c7..4f0afce8428d 100644 --- a/drivers/message/fusion/mptbase.c +++ b/drivers/message/fusion/mptbase.c @@ -6935,7 +6935,7 @@ EXPORT_SYMBOL(mpt_clear_taskmgmt_in_progress_flag); * @ioc: Pointer to MPT_ADAPTER structure * **/ -void +void __noreturn mpt_halt_firmware(MPT_ADAPTER *ioc) { u32 ioc_raw_state; diff --git a/drivers/message/fusion/mptbase.h b/drivers/message/fusion/mptbase.h index e0ba783de368..8031173c3655 100644 --- a/drivers/message/fusion/mptbase.h +++ b/drivers/message/fusion/mptbase.h @@ -944,7 +944,7 @@ extern int mpt_raid_phys_disk_get_num_paths(MPT_ADAPTER *ioc, u8 phys_disk_num); extern int mpt_set_taskmgmt_in_progress_flag(MPT_ADAPTER *ioc); extern void mpt_clear_taskmgmt_in_progress_flag(MPT_ADAPTER *ioc); -extern void mpt_halt_firmware(MPT_ADAPTER *ioc); +extern void __noreturn mpt_halt_firmware(MPT_ADAPTER *ioc); /* diff --git a/drivers/misc/lkdtm/stackleak.c b/drivers/misc/lkdtm/stackleak.c index 025b133297a6..f1d022160913 100644 --- a/drivers/misc/lkdtm/stackleak.c +++ b/drivers/misc/lkdtm/stackleak.c @@ -43,12 +43,14 @@ static void noinstr check_stackleak_irqoff(void) * STACK_END_MAGIC, and in either casee something is seriously wrong. */ if (current_sp < task_stack_low || current_sp >= task_stack_high) { + instrumentation_begin(); pr_err("FAIL: current_stack_pointer (0x%lx) outside of task stack bounds [0x%lx..0x%lx]\n", current_sp, task_stack_low, task_stack_high - 1); test_failed = true; goto out; } if (lowest_sp < task_stack_low || lowest_sp >= task_stack_high) { + instrumentation_begin(); pr_err("FAIL: current->lowest_stack (0x%lx) outside of task stack bounds [0x%lx..0x%lx]\n", lowest_sp, task_stack_low, task_stack_high - 1); test_failed = true; @@ -86,11 +88,14 @@ static void noinstr check_stackleak_irqoff(void) if (*(unsigned long *)poison_low == STACKLEAK_POISON) continue; + instrumentation_begin(); pr_err("FAIL: non-poison value %lu bytes below poison boundary: 0x%lx\n", poison_high - poison_low, *(unsigned long *)poison_low); test_failed = true; + goto out; } + instrumentation_begin(); pr_info("stackleak stack usage:\n" " high offset: %lu bytes\n" " current: %lu bytes\n" @@ -113,6 +118,7 @@ out: } else { pr_info("OK: the rest of the thread stack is properly erased\n"); } + instrumentation_end(); } static void lkdtm_STACKLEAK_ERASING(void) diff --git a/include/linux/context_tracking.h b/include/linux/context_tracking.h index 3a7909ed5498..d3cbb6c16bab 100644 --- a/include/linux/context_tracking.h +++ b/include/linux/context_tracking.h @@ -98,7 +98,7 @@ static inline void exception_exit(enum ctx_state prev_ctx) { } static inline int ct_state(void) { return -1; } static inline int __ct_state(void) { return -1; } static __always_inline bool context_tracking_guest_enter(void) { return false; } -static inline void context_tracking_guest_exit(void) { } +static __always_inline void context_tracking_guest_exit(void) { } #define CT_WARN_ON(cond) do { } while (0) #endif /* !CONFIG_CONTEXT_TRACKING_USER */ diff --git a/include/linux/cpu.h b/include/linux/cpu.h index f83e4519c5f0..8582a7142623 100644 --- a/include/linux/cpu.h +++ b/include/linux/cpu.h @@ -182,7 +182,7 @@ void arch_cpu_idle(void); void arch_cpu_idle_prepare(void); void arch_cpu_idle_enter(void); void arch_cpu_idle_exit(void); -void arch_cpu_idle_dead(void); +void __noreturn arch_cpu_idle_dead(void); int cpu_report_state(int cpu); int cpu_check_up_prepare(int cpu); diff --git a/include/linux/objtool.h b/include/linux/objtool.h index 9ac3df3fccf0..03f82c2c2ebf 100644 --- a/include/linux/objtool.h +++ b/include/linux/objtool.h @@ -2,47 +2,7 @@ #ifndef _LINUX_OBJTOOL_H #define _LINUX_OBJTOOL_H -#ifndef __ASSEMBLY__ - -#include <linux/types.h> - -/* - * This struct is used by asm and inline asm code to manually annotate the - * location of registers on the stack. - */ -struct unwind_hint { - u32 ip; - s16 sp_offset; - u8 sp_reg; - u8 type; - u8 signal; - u8 end; -}; -#endif - -/* - * UNWIND_HINT_TYPE_CALL: Indicates that sp_reg+sp_offset resolves to PREV_SP - * (the caller's SP right before it made the call). Used for all callable - * functions, i.e. all C code and all callable asm functions. - * - * UNWIND_HINT_TYPE_REGS: Used in entry code to indicate that sp_reg+sp_offset - * points to a fully populated pt_regs from a syscall, interrupt, or exception. - * - * UNWIND_HINT_TYPE_REGS_PARTIAL: Used in entry code to indicate that - * sp_reg+sp_offset points to the iret return frame. - * - * UNWIND_HINT_FUNC: Generate the unwind metadata of a callable function. - * Useful for code which doesn't have an ELF function annotation. - * - * UNWIND_HINT_ENTRY: machine entry without stack, SYSCALL/SYSENTER etc. - */ -#define UNWIND_HINT_TYPE_CALL 0 -#define UNWIND_HINT_TYPE_REGS 1 -#define UNWIND_HINT_TYPE_REGS_PARTIAL 2 -#define UNWIND_HINT_TYPE_FUNC 3 -#define UNWIND_HINT_TYPE_ENTRY 4 -#define UNWIND_HINT_TYPE_SAVE 5 -#define UNWIND_HINT_TYPE_RESTORE 6 +#include <linux/objtool_types.h> #ifdef CONFIG_OBJTOOL @@ -50,7 +10,7 @@ struct unwind_hint { #ifndef __ASSEMBLY__ -#define UNWIND_HINT(sp_reg, sp_offset, type, signal, end) \ +#define UNWIND_HINT(type, sp_reg, sp_offset, signal) \ "987: \n\t" \ ".pushsection .discard.unwind_hints\n\t" \ /* struct unwind_hint */ \ @@ -59,7 +19,6 @@ struct unwind_hint { ".byte " __stringify(sp_reg) "\n\t" \ ".byte " __stringify(type) "\n\t" \ ".byte " __stringify(signal) "\n\t" \ - ".byte " __stringify(end) "\n\t" \ ".balign 4 \n\t" \ ".popsection\n\t" @@ -89,7 +48,7 @@ struct unwind_hint { #define ANNOTATE_NOENDBR \ "986: \n\t" \ ".pushsection .discard.noendbr\n\t" \ - _ASM_PTR " 986b\n\t" \ + ".long 986b - .\n\t" \ ".popsection\n\t" #define ASM_REACHABLE \ @@ -107,7 +66,7 @@ struct unwind_hint { #define ANNOTATE_INTRA_FUNCTION_CALL \ 999: \ .pushsection .discard.intra_function_calls; \ - .long 999b; \ + .long 999b - .; \ .popsection; /* @@ -131,23 +90,22 @@ struct unwind_hint { * the debuginfo as necessary. It will also warn if it sees any * inconsistencies. */ -.macro UNWIND_HINT type:req sp_reg=0 sp_offset=0 signal=0 end=0 -.Lunwind_hint_ip_\@: +.macro UNWIND_HINT type:req sp_reg=0 sp_offset=0 signal=0 +.Lhere_\@: .pushsection .discard.unwind_hints /* struct unwind_hint */ - .long .Lunwind_hint_ip_\@ - . + .long .Lhere_\@ - . .short \sp_offset .byte \sp_reg .byte \type .byte \signal - .byte \end .balign 4 .popsection .endm .macro STACK_FRAME_NON_STANDARD func:req .pushsection .discard.func_stack_frame_non_standard, "aw" - _ASM_PTR \func + .long \func - . .popsection .endm @@ -160,8 +118,24 @@ struct unwind_hint { .macro ANNOTATE_NOENDBR .Lhere_\@: .pushsection .discard.noendbr - .quad .Lhere_\@ + .long .Lhere_\@ - . + .popsection +.endm + +/* + * Use objtool to validate the entry requirement that all code paths do + * VALIDATE_UNRET_END before RET. + * + * NOTE: The macro must be used at the beginning of a global symbol, otherwise + * it will be ignored. + */ +.macro VALIDATE_UNRET_BEGIN +#if defined(CONFIG_NOINSTR_VALIDATION) && defined(CONFIG_CPU_UNRET_ENTRY) +.Lhere_\@: + .pushsection .discard.validate_unret + .long .Lhere_\@ - . .popsection +#endif .endm .macro REACHABLE @@ -177,15 +151,14 @@ struct unwind_hint { #ifndef __ASSEMBLY__ -#define UNWIND_HINT(sp_reg, sp_offset, type, signal, end) \ - "\n\t" +#define UNWIND_HINT(type, sp_reg, sp_offset, signal) "\n\t" #define STACK_FRAME_NON_STANDARD(func) #define STACK_FRAME_NON_STANDARD_FP(func) #define ANNOTATE_NOENDBR #define ASM_REACHABLE #else #define ANNOTATE_INTRA_FUNCTION_CALL -.macro UNWIND_HINT type:req sp_reg=0 sp_offset=0 signal=0 end=0 +.macro UNWIND_HINT type:req sp_reg=0 sp_offset=0 signal=0 .endm .macro STACK_FRAME_NON_STANDARD func:req .endm diff --git a/include/linux/objtool_types.h b/include/linux/objtool_types.h new file mode 100644 index 000000000000..453a4f4ef39d --- /dev/null +++ b/include/linux/objtool_types.h @@ -0,0 +1,57 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_OBJTOOL_TYPES_H +#define _LINUX_OBJTOOL_TYPES_H + +#ifndef __ASSEMBLY__ + +#include <linux/types.h> + +/* + * This struct is used by asm and inline asm code to manually annotate the + * location of registers on the stack. + */ +struct unwind_hint { + u32 ip; + s16 sp_offset; + u8 sp_reg; + u8 type; + u8 signal; +}; + +#endif /* __ASSEMBLY__ */ + +/* + * UNWIND_HINT_TYPE_UNDEFINED: A blind spot in ORC coverage which can result in + * a truncated and unreliable stack unwind. + * + * UNWIND_HINT_TYPE_END_OF_STACK: The end of the kernel stack unwind before + * hitting user entry, boot code, or fork entry (when there are no pt_regs + * available). + * + * UNWIND_HINT_TYPE_CALL: Indicates that sp_reg+sp_offset resolves to PREV_SP + * (the caller's SP right before it made the call). Used for all callable + * functions, i.e. all C code and all callable asm functions. + * + * UNWIND_HINT_TYPE_REGS: Used in entry code to indicate that sp_reg+sp_offset + * points to a fully populated pt_regs from a syscall, interrupt, or exception. + * + * UNWIND_HINT_TYPE_REGS_PARTIAL: Used in entry code to indicate that + * sp_reg+sp_offset points to the iret return frame. + * + * UNWIND_HINT_TYPE_FUNC: Generate the unwind metadata of a callable function. + * Useful for code which doesn't have an ELF function annotation. + * + * UNWIND_HINT_TYPE_{SAVE,RESTORE}: Save the unwind metadata at a certain + * location so that it can be restored later. + */ +#define UNWIND_HINT_TYPE_UNDEFINED 0 +#define UNWIND_HINT_TYPE_END_OF_STACK 1 +#define UNWIND_HINT_TYPE_CALL 2 +#define UNWIND_HINT_TYPE_REGS 3 +#define UNWIND_HINT_TYPE_REGS_PARTIAL 4 +/* The below hint types don't have corresponding ORC types */ +#define UNWIND_HINT_TYPE_FUNC 5 +#define UNWIND_HINT_TYPE_SAVE 6 +#define UNWIND_HINT_TYPE_RESTORE 7 + +#endif /* _LINUX_OBJTOOL_TYPES_H */ diff --git a/include/linux/sched/task_stack.h b/include/linux/sched/task_stack.h index 5e799a47431e..f158b025c175 100644 --- a/include/linux/sched/task_stack.h +++ b/include/linux/sched/task_stack.h @@ -23,7 +23,7 @@ static __always_inline void *task_stack_page(const struct task_struct *task) #define setup_thread_stack(new,old) do { } while(0) -static inline unsigned long *end_of_stack(const struct task_struct *task) +static __always_inline unsigned long *end_of_stack(const struct task_struct *task) { #ifdef CONFIG_STACK_GROWSUP return (unsigned long *)((unsigned long)task->stack + THREAD_SIZE) - 1; diff --git a/include/linux/smp.h b/include/linux/smp.h index a80ab58ae3f1..7b93504eed26 100644 --- a/include/linux/smp.h +++ b/include/linux/smp.h @@ -59,8 +59,8 @@ int smp_call_function_single_async(int cpu, struct __call_single_data *csd); * Cpus stopping functions in panic. All have default weak definitions. * Architecture-dependent code may override them. */ -void panic_smp_self_stop(void); -void nmi_panic_self_stop(struct pt_regs *regs); +void __noreturn panic_smp_self_stop(void); +void __noreturn nmi_panic_self_stop(struct pt_regs *regs); void crash_smp_send_stop(void); /* diff --git a/include/linux/start_kernel.h b/include/linux/start_kernel.h index 8b369a41c03c..a9806a44a605 100644 --- a/include/linux/start_kernel.h +++ b/include/linux/start_kernel.h @@ -8,8 +8,8 @@ /* Define the prototype for start_kernel here, rather than cluttering up something else. */ -extern asmlinkage void __init start_kernel(void); -extern void __init arch_call_rest_init(void); -extern void __ref rest_init(void); +extern asmlinkage void __init __noreturn start_kernel(void); +extern void __init __noreturn arch_call_rest_init(void); +extern void __ref __noreturn rest_init(void); #endif /* _LINUX_START_KERNEL_H */ diff --git a/init/main.c b/init/main.c index b55954043c98..af50044deed5 100644 --- a/init/main.c +++ b/init/main.c @@ -686,7 +686,7 @@ static void __init setup_command_line(char *command_line) static __initdata DECLARE_COMPLETION(kthreadd_done); -noinline void __ref rest_init(void) +noinline void __ref __noreturn rest_init(void) { struct task_struct *tsk; int pid; @@ -829,7 +829,7 @@ static int __init early_randomize_kstack_offset(char *buf) early_param("randomize_kstack_offset", early_randomize_kstack_offset); #endif -void __init __weak arch_call_rest_init(void) +void __init __weak __noreturn arch_call_rest_init(void) { rest_init(); } @@ -877,7 +877,7 @@ static void __init print_unknown_bootoptions(void) memblock_free(unknown_options, len); } -asmlinkage __visible void __init __no_sanitize_address start_kernel(void) +asmlinkage __visible void __init __no_sanitize_address __noreturn start_kernel(void) { char *command_line; char *after_dashes; diff --git a/kernel/panic.c b/kernel/panic.c index 5cfea8302d23..886d2ebd0a0d 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -141,7 +141,7 @@ EXPORT_SYMBOL(panic_blink); /* * Stop ourself in panic -- architecture code may override this */ -void __weak panic_smp_self_stop(void) +void __weak __noreturn panic_smp_self_stop(void) { while (1) cpu_relax(); @@ -151,7 +151,7 @@ void __weak panic_smp_self_stop(void) * Stop ourselves in NMI context if another CPU has already panicked. Arch code * may override this to prepare for crash dumping, e.g. save regs info. */ -void __weak nmi_panic_self_stop(struct pt_regs *regs) +void __weak __noreturn nmi_panic_self_stop(struct pt_regs *regs) { panic_smp_self_stop(); } diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c index e9ef66be2870..342f58a329f5 100644 --- a/kernel/sched/idle.c +++ b/kernel/sched/idle.c @@ -75,7 +75,7 @@ static noinline int __cpuidle cpu_idle_poll(void) void __weak arch_cpu_idle_prepare(void) { } void __weak arch_cpu_idle_enter(void) { } void __weak arch_cpu_idle_exit(void) { } -void __weak arch_cpu_idle_dead(void) { } +void __weak __noreturn arch_cpu_idle_dead(void) { while (1); } void __weak arch_cpu_idle(void) { cpu_idle_force_poll = 1; diff --git a/scripts/objdump-func b/scripts/objdump-func index 4eb463dd9f52..7b15b873d0e2 100755 --- a/scripts/objdump-func +++ b/scripts/objdump-func @@ -3,7 +3,7 @@ # # Disassemble a single function. # -# usage: objdump-func <file> <func> +# usage: objdump-func <file> <func> [<func> ...] set -o errexit set -o nounset @@ -13,17 +13,33 @@ OBJDUMP="${CROSS_COMPILE:-}objdump" command -v gawk >/dev/null 2>&1 || die "gawk isn't installed" usage() { - echo "usage: objdump-func <file> <func>" >&2 + echo "usage: objdump-func <file> <func> [<func> ...]" >&2 exit 1 } [[ $# -lt 2 ]] && usage OBJ=$1; shift -FUNC=$1; shift - -# Secret feature to allow adding extra objdump args at the end -EXTRA_ARGS=$@ - -# Note this also matches compiler-added suffixes like ".cold", etc -${OBJDUMP} -wdr $EXTRA_ARGS $OBJ | gawk -M -v f=$FUNC '/^$/ { P=0; } $0 ~ "<" f "(\\..*)?>:" { P=1; O=strtonum("0x" $1); } { if (P) { o=strtonum("0x" $1); printf("%04x ", o-O); print $0; } }' +FUNCS=("$@") + +${OBJDUMP} -wdr $OBJ | gawk -M -v _funcs="${FUNCS[*]}" ' + BEGIN { split(_funcs, funcs); } + /^$/ { func_match=0; } + /<.*>:/ { + f = gensub(/.*<(.*)>:/, "\\1", 1); + for (i in funcs) { + # match compiler-added suffixes like ".cold", etc + if (f ~ "^" funcs[i] "(\\..*)?") { + func_match = 1; + base = strtonum("0x" $1); + break; + } + } + } + { + if (func_match) { + addr = strtonum("0x" $1); + printf("%04x ", addr - base); + print; + } + }' diff --git a/scripts/sorttable.h b/scripts/sorttable.h index deb7c1d3e979..7bd0184380d3 100644 --- a/scripts/sorttable.h +++ b/scripts/sorttable.h @@ -128,7 +128,7 @@ static int orc_sort_cmp(const void *_a, const void *_b) * whitelisted .o files which didn't get objtool generation. */ orc_a = g_orc_table + (a - g_orc_ip_table); - return orc_a->sp_reg == ORC_REG_UNDEFINED && !orc_a->end ? -1 : 1; + return orc_a->type == ORC_TYPE_UNDEFINED ? -1 : 1; } static void *sort_orctable(void *arg) diff --git a/tools/arch/x86/include/asm/orc_types.h b/tools/arch/x86/include/asm/orc_types.h index 1343a62106de..46d7e06763c9 100644 --- a/tools/arch/x86/include/asm/orc_types.h +++ b/tools/arch/x86/include/asm/orc_types.h @@ -39,6 +39,12 @@ #define ORC_REG_SP_INDIRECT 9 #define ORC_REG_MAX 15 +#define ORC_TYPE_UNDEFINED 0 +#define ORC_TYPE_END_OF_STACK 1 +#define ORC_TYPE_CALL 2 +#define ORC_TYPE_REGS 3 +#define ORC_TYPE_REGS_PARTIAL 4 + #ifndef __ASSEMBLY__ #include <asm/byteorder.h> @@ -56,16 +62,14 @@ struct orc_entry { #if defined(__LITTLE_ENDIAN_BITFIELD) unsigned sp_reg:4; unsigned bp_reg:4; - unsigned type:2; + unsigned type:3; unsigned signal:1; - unsigned end:1; #elif defined(__BIG_ENDIAN_BITFIELD) unsigned bp_reg:4; unsigned sp_reg:4; unsigned unused:4; - unsigned end:1; unsigned signal:1; - unsigned type:2; + unsigned type:3; #endif } __packed; diff --git a/tools/include/linux/objtool.h b/tools/include/linux/objtool.h deleted file mode 100644 index 9ac3df3fccf0..000000000000 --- a/tools/include/linux/objtool.h +++ /dev/null @@ -1,200 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -#ifndef _LINUX_OBJTOOL_H -#define _LINUX_OBJTOOL_H - -#ifndef __ASSEMBLY__ - -#include <linux/types.h> - -/* - * This struct is used by asm and inline asm code to manually annotate the - * location of registers on the stack. - */ -struct unwind_hint { - u32 ip; - s16 sp_offset; - u8 sp_reg; - u8 type; - u8 signal; - u8 end; -}; -#endif - -/* - * UNWIND_HINT_TYPE_CALL: Indicates that sp_reg+sp_offset resolves to PREV_SP - * (the caller's SP right before it made the call). Used for all callable - * functions, i.e. all C code and all callable asm functions. - * - * UNWIND_HINT_TYPE_REGS: Used in entry code to indicate that sp_reg+sp_offset - * points to a fully populated pt_regs from a syscall, interrupt, or exception. - * - * UNWIND_HINT_TYPE_REGS_PARTIAL: Used in entry code to indicate that - * sp_reg+sp_offset points to the iret return frame. - * - * UNWIND_HINT_FUNC: Generate the unwind metadata of a callable function. - * Useful for code which doesn't have an ELF function annotation. - * - * UNWIND_HINT_ENTRY: machine entry without stack, SYSCALL/SYSENTER etc. - */ -#define UNWIND_HINT_TYPE_CALL 0 -#define UNWIND_HINT_TYPE_REGS 1 -#define UNWIND_HINT_TYPE_REGS_PARTIAL 2 -#define UNWIND_HINT_TYPE_FUNC 3 -#define UNWIND_HINT_TYPE_ENTRY 4 -#define UNWIND_HINT_TYPE_SAVE 5 -#define UNWIND_HINT_TYPE_RESTORE 6 - -#ifdef CONFIG_OBJTOOL - -#include <asm/asm.h> - -#ifndef __ASSEMBLY__ - -#define UNWIND_HINT(sp_reg, sp_offset, type, signal, end) \ - "987: \n\t" \ - ".pushsection .discard.unwind_hints\n\t" \ - /* struct unwind_hint */ \ - ".long 987b - .\n\t" \ - ".short " __stringify(sp_offset) "\n\t" \ - ".byte " __stringify(sp_reg) "\n\t" \ - ".byte " __stringify(type) "\n\t" \ - ".byte " __stringify(signal) "\n\t" \ - ".byte " __stringify(end) "\n\t" \ - ".balign 4 \n\t" \ - ".popsection\n\t" - -/* - * This macro marks the given function's stack frame as "non-standard", which - * tells objtool to ignore the function when doing stack metadata validation. - * It should only be used in special cases where you're 100% sure it won't - * affect the reliability of frame pointers and kernel stack traces. - * - * For more information, see tools/objtool/Documentation/objtool.txt. - */ -#define STACK_FRAME_NON_STANDARD(func) \ - static void __used __section(".discard.func_stack_frame_non_standard") \ - *__func_stack_frame_non_standard_##func = func - -/* - * STACK_FRAME_NON_STANDARD_FP() is a frame-pointer-specific function ignore - * for the case where a function is intentionally missing frame pointer setup, - * but otherwise needs objtool/ORC coverage when frame pointers are disabled. - */ -#ifdef CONFIG_FRAME_POINTER -#define STACK_FRAME_NON_STANDARD_FP(func) STACK_FRAME_NON_STANDARD(func) -#else -#define STACK_FRAME_NON_STANDARD_FP(func) -#endif - -#define ANNOTATE_NOENDBR \ - "986: \n\t" \ - ".pushsection .discard.noendbr\n\t" \ - _ASM_PTR " 986b\n\t" \ - ".popsection\n\t" - -#define ASM_REACHABLE \ - "998:\n\t" \ - ".pushsection .discard.reachable\n\t" \ - ".long 998b - .\n\t" \ - ".popsection\n\t" - -#else /* __ASSEMBLY__ */ - -/* - * This macro indicates that the following intra-function call is valid. - * Any non-annotated intra-function call will cause objtool to issue a warning. - */ -#define ANNOTATE_INTRA_FUNCTION_CALL \ - 999: \ - .pushsection .discard.intra_function_calls; \ - .long 999b; \ - .popsection; - -/* - * In asm, there are two kinds of code: normal C-type callable functions and - * the rest. The normal callable functions can be called by other code, and - * don't do anything unusual with the stack. Such normal callable functions - * are annotated with the ENTRY/ENDPROC macros. Most asm code falls in this - * category. In this case, no special debugging annotations are needed because - * objtool can automatically generate the ORC data for the ORC unwinder to read - * at runtime. - * - * Anything which doesn't fall into the above category, such as syscall and - * interrupt handlers, tends to not be called directly by other functions, and - * often does unusual non-C-function-type things with the stack pointer. Such - * code needs to be annotated such that objtool can understand it. The - * following CFI hint macros are for this type of code. - * - * These macros provide hints to objtool about the state of the stack at each - * instruction. Objtool starts from the hints and follows the code flow, - * making automatic CFI adjustments when it sees pushes and pops, filling out - * the debuginfo as necessary. It will also warn if it sees any - * inconsistencies. - */ -.macro UNWIND_HINT type:req sp_reg=0 sp_offset=0 signal=0 end=0 -.Lunwind_hint_ip_\@: - .pushsection .discard.unwind_hints - /* struct unwind_hint */ - .long .Lunwind_hint_ip_\@ - . - .short \sp_offset - .byte \sp_reg - .byte \type - .byte \signal - .byte \end - .balign 4 - .popsection -.endm - -.macro STACK_FRAME_NON_STANDARD func:req - .pushsection .discard.func_stack_frame_non_standard, "aw" - _ASM_PTR \func - .popsection -.endm - -.macro STACK_FRAME_NON_STANDARD_FP func:req -#ifdef CONFIG_FRAME_POINTER - STACK_FRAME_NON_STANDARD \func -#endif -.endm - -.macro ANNOTATE_NOENDBR -.Lhere_\@: - .pushsection .discard.noendbr - .quad .Lhere_\@ - .popsection -.endm - -.macro REACHABLE -.Lhere_\@: - .pushsection .discard.reachable - .long .Lhere_\@ - . - .popsection -.endm - -#endif /* __ASSEMBLY__ */ - -#else /* !CONFIG_OBJTOOL */ - -#ifndef __ASSEMBLY__ - -#define UNWIND_HINT(sp_reg, sp_offset, type, signal, end) \ - "\n\t" -#define STACK_FRAME_NON_STANDARD(func) -#define STACK_FRAME_NON_STANDARD_FP(func) -#define ANNOTATE_NOENDBR -#define ASM_REACHABLE -#else -#define ANNOTATE_INTRA_FUNCTION_CALL -.macro UNWIND_HINT type:req sp_reg=0 sp_offset=0 signal=0 end=0 -.endm -.macro STACK_FRAME_NON_STANDARD func:req -.endm -.macro ANNOTATE_NOENDBR -.endm -.macro REACHABLE -.endm -#endif - -#endif /* CONFIG_OBJTOOL */ - -#endif /* _LINUX_OBJTOOL_H */ diff --git a/tools/include/linux/objtool_types.h b/tools/include/linux/objtool_types.h new file mode 100644 index 000000000000..453a4f4ef39d --- /dev/null +++ b/tools/include/linux/objtool_types.h @@ -0,0 +1,57 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_OBJTOOL_TYPES_H +#define _LINUX_OBJTOOL_TYPES_H + +#ifndef __ASSEMBLY__ + +#include <linux/types.h> + +/* + * This struct is used by asm and inline asm code to manually annotate the + * location of registers on the stack. + */ +struct unwind_hint { + u32 ip; + s16 sp_offset; + u8 sp_reg; + u8 type; + u8 signal; +}; + +#endif /* __ASSEMBLY__ */ + +/* + * UNWIND_HINT_TYPE_UNDEFINED: A blind spot in ORC coverage which can result in + * a truncated and unreliable stack unwind. + * + * UNWIND_HINT_TYPE_END_OF_STACK: The end of the kernel stack unwind before + * hitting user entry, boot code, or fork entry (when there are no pt_regs + * available). + * + * UNWIND_HINT_TYPE_CALL: Indicates that sp_reg+sp_offset resolves to PREV_SP + * (the caller's SP right before it made the call). Used for all callable + * functions, i.e. all C code and all callable asm functions. + * + * UNWIND_HINT_TYPE_REGS: Used in entry code to indicate that sp_reg+sp_offset + * points to a fully populated pt_regs from a syscall, interrupt, or exception. + * + * UNWIND_HINT_TYPE_REGS_PARTIAL: Used in entry code to indicate that + * sp_reg+sp_offset points to the iret return frame. + * + * UNWIND_HINT_TYPE_FUNC: Generate the unwind metadata of a callable function. + * Useful for code which doesn't have an ELF function annotation. + * + * UNWIND_HINT_TYPE_{SAVE,RESTORE}: Save the unwind metadata at a certain + * location so that it can be restored later. + */ +#define UNWIND_HINT_TYPE_UNDEFINED 0 +#define UNWIND_HINT_TYPE_END_OF_STACK 1 +#define UNWIND_HINT_TYPE_CALL 2 +#define UNWIND_HINT_TYPE_REGS 3 +#define UNWIND_HINT_TYPE_REGS_PARTIAL 4 +/* The below hint types don't have corresponding ORC types */ +#define UNWIND_HINT_TYPE_FUNC 5 +#define UNWIND_HINT_TYPE_SAVE 6 +#define UNWIND_HINT_TYPE_RESTORE 7 + +#endif /* _LINUX_OBJTOOL_TYPES_H */ diff --git a/tools/objtool/check.c b/tools/objtool/check.c index 931cdb7dba19..0fcf99c91400 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -17,7 +17,7 @@ #include <objtool/warn.h> #include <objtool/endianness.h> -#include <linux/objtool.h> +#include <linux/objtool_types.h> #include <linux/hashtable.h> #include <linux/kernel.h> #include <linux/static_call_types.h> @@ -202,6 +202,8 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func, "__reiserfs_panic", "__stack_chk_fail", "__ubsan_handle_builtin_unreachable", + "arch_call_rest_init", + "arch_cpu_idle_dead", "btrfs_assertfail", "cpu_bringup_and_idle", "cpu_startup_entry", @@ -210,18 +212,28 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func, "do_task_dead", "ex_handler_msr_mce", "fortify_panic", + "hlt_play_dead", + "hv_ghcb_terminate", "kthread_complete_and_exit", "kthread_exit", "kunit_try_catch_throw", "lbug_with_loc", "machine_real_restart", "make_task_dead", + "mpt_halt_firmware", + "nmi_panic_self_stop", "panic", + "panic_smp_self_stop", + "rest_init", + "resume_play_dead", "rewind_stack_and_make_dead", "sev_es_terminate", "snp_abort", + "start_kernel", "stop_this_cpu", "usercopy_abort", + "x86_64_start_kernel", + "x86_64_start_reservations", "xen_cpu_bringup_again", "xen_start_kernel", }; @@ -229,14 +241,14 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func, if (!func) return false; - if (func->bind == STB_WEAK) - return false; - - if (func->bind == STB_GLOBAL) + if (func->bind == STB_GLOBAL || func->bind == STB_WEAK) for (i = 0; i < ARRAY_SIZE(global_noreturns); i++) if (!strcmp(func->name, global_noreturns[i])) return true; + if (func->bind == STB_WEAK) + return false; + if (!func->len) return false; @@ -470,7 +482,7 @@ static int decode_instructions(struct objtool_file *file) // printf("%s: last chunk used: %d\n", sec->name, (int)idx); - list_for_each_entry(func, &sec->symbol_list, list) { + sec_for_each_sym(sec, func) { if (func->type != STT_NOTYPE && func->type != STT_FUNC) continue; @@ -924,7 +936,7 @@ static int create_ibt_endbr_seal_sections(struct objtool_file *file) static int create_cfi_sections(struct objtool_file *file) { - struct section *sec, *s; + struct section *sec; struct symbol *sym; unsigned int *loc; int idx; @@ -937,19 +949,14 @@ static int create_cfi_sections(struct objtool_file *file) } idx = 0; - for_each_sec(file, s) { - if (!s->text) + for_each_sym(file, sym) { + if (sym->type != STT_FUNC) continue; - list_for_each_entry(sym, &s->symbol_list, list) { - if (sym->type != STT_FUNC) - continue; - - if (strncmp(sym->name, "__cfi_", 6)) - continue; + if (strncmp(sym->name, "__cfi_", 6)) + continue; - idx++; - } + idx++; } sec = elf_create_section(file->elf, ".cfi_sites", 0, sizeof(unsigned int), idx); @@ -957,28 +964,23 @@ static int create_cfi_sections(struct objtool_file *file) return -1; idx = 0; - for_each_sec(file, s) { - if (!s->text) + for_each_sym(file, sym) { + if (sym->type != STT_FUNC) continue; - list_for_each_entry(sym, &s->symbol_list, list) { - if (sym->type != STT_FUNC) - continue; - - if (strncmp(sym->name, "__cfi_", 6)) - continue; + if (strncmp(sym->name, "__cfi_", 6)) + continue; - loc = (unsigned int *)sec->data->d_buf + idx; - memset(loc, 0, sizeof(unsigned int)); + loc = (unsigned int *)sec->data->d_buf + idx; + memset(loc, 0, sizeof(unsigned int)); - if (elf_add_reloc_to_insn(file->elf, sec, - idx * sizeof(unsigned int), - R_X86_64_PC32, - s, sym->offset)) - return -1; + if (elf_add_reloc_to_insn(file->elf, sec, + idx * sizeof(unsigned int), + R_X86_64_PC32, + sym->sec, sym->offset)) + return -1; - idx++; - } + idx++; } return 0; @@ -1279,6 +1281,8 @@ static const char *uaccess_safe_builtin[] = { "__ubsan_handle_type_mismatch_v1", "__ubsan_handle_shift_out_of_bounds", "__ubsan_handle_load_invalid_value", + /* STACKLEAK */ + "stackleak_track_stack", /* misc */ "csum_partial_copy_generic", "copy_mc_fragile", @@ -1444,7 +1448,7 @@ static void annotate_call_site(struct objtool_file *file, if (opts.mcount && sym->fentry) { if (sibling) - WARN_FUNC("Tail call to __fentry__ !?!?", insn->sec, insn->offset); + WARN_INSN(insn, "tail call to __fentry__ !?!?"); if (opts.mnop) { if (reloc) { reloc->type = R_NONE; @@ -1646,9 +1650,8 @@ static int add_jump_destinations(struct objtool_file *file) continue; } - WARN_FUNC("can't find jump dest instruction at %s+0x%lx", - insn->sec, insn->offset, dest_sec->name, - dest_off); + WARN_INSN(insn, "can't find jump dest instruction at %s+0x%lx", + dest_sec->name, dest_off); return -1; } @@ -1731,13 +1734,12 @@ static int add_call_destinations(struct objtool_file *file) continue; if (!insn_call_dest(insn)) { - WARN_FUNC("unannotated intra-function call", insn->sec, insn->offset); + WARN_INSN(insn, "unannotated intra-function call"); return -1; } if (insn_func(insn) && insn_call_dest(insn)->type != STT_FUNC) { - WARN_FUNC("unsupported call to non-function", - insn->sec, insn->offset); + WARN_INSN(insn, "unsupported call to non-function"); return -1; } @@ -1745,10 +1747,8 @@ static int add_call_destinations(struct objtool_file *file) dest_off = arch_dest_reloc_offset(reloc->addend); dest = find_call_destination(reloc->sym->sec, dest_off); if (!dest) { - WARN_FUNC("can't find call dest symbol at %s+0x%lx", - insn->sec, insn->offset, - reloc->sym->sec->name, - dest_off); + WARN_INSN(insn, "can't find call dest symbol at %s+0x%lx", + reloc->sym->sec->name, dest_off); return -1; } @@ -1808,8 +1808,7 @@ static int handle_group_alt(struct objtool_file *file, } else { if (orig_alt_group->last_insn->offset + orig_alt_group->last_insn->len - orig_alt_group->first_insn->offset != special_alt->orig_len) { - WARN_FUNC("weirdly overlapping alternative! %ld != %d", - orig_insn->sec, orig_insn->offset, + WARN_INSN(orig_insn, "weirdly overlapping alternative! %ld != %d", orig_alt_group->last_insn->offset + orig_alt_group->last_insn->len - orig_alt_group->first_insn->offset, @@ -1878,8 +1877,7 @@ static int handle_group_alt(struct objtool_file *file, if (alt_reloc && arch_pc_relative_reloc(alt_reloc) && !arch_support_alt_relocation(special_alt, insn, alt_reloc)) { - WARN_FUNC("unsupported relocation in alternatives section", - insn->sec, insn->offset); + WARN_INSN(insn, "unsupported relocation in alternatives section"); return -1; } @@ -1893,8 +1891,7 @@ static int handle_group_alt(struct objtool_file *file, if (dest_off == special_alt->new_off + special_alt->new_len) { insn->jump_dest = next_insn_same_sec(file, orig_alt_group->last_insn); if (!insn->jump_dest) { - WARN_FUNC("can't find alternative jump destination", - insn->sec, insn->offset); + WARN_INSN(insn, "can't find alternative jump destination"); return -1; } } @@ -1928,8 +1925,7 @@ static int handle_jump_alt(struct objtool_file *file, if (orig_insn->type != INSN_JUMP_UNCONDITIONAL && orig_insn->type != INSN_NOP) { - WARN_FUNC("unsupported instruction at jump label", - orig_insn->sec, orig_insn->offset); + WARN_INSN(orig_insn, "unsupported instruction at jump label"); return -1; } @@ -2008,8 +2004,7 @@ static int add_special_section_alts(struct objtool_file *file) if (special_alt->group) { if (!special_alt->orig_len) { - WARN_FUNC("empty alternative entry", - orig_insn->sec, orig_insn->offset); + WARN_INSN(orig_insn, "empty alternative entry"); continue; } @@ -2100,8 +2095,7 @@ static int add_jump_table(struct objtool_file *file, struct instruction *insn, } if (!prev_offset) { - WARN_FUNC("can't find switch jump table", - insn->sec, insn->offset); + WARN_INSN(insn, "can't find switch jump table"); return -1; } @@ -2215,23 +2209,20 @@ static int add_func_jump_tables(struct objtool_file *file, */ static int add_jump_table_alts(struct objtool_file *file) { - struct section *sec; struct symbol *func; int ret; if (!file->rodata) return 0; - for_each_sec(file, sec) { - list_for_each_entry(func, &sec->symbol_list, list) { - if (func->type != STT_FUNC) - continue; + for_each_sym(file, func) { + if (func->type != STT_FUNC) + continue; - mark_func_jump_tables(file, func); - ret = add_func_jump_tables(file, func); - if (ret) - return ret; - } + mark_func_jump_tables(file, func); + ret = add_func_jump_tables(file, func); + if (ret) + return ret; } return 0; @@ -2243,6 +2234,7 @@ static void set_func_state(struct cfi_state *state) memcpy(&state->regs, &initial_func_cfi.regs, CFI_NUM_REGS * sizeof(struct cfi_reg)); state->stack_size = initial_func_cfi.cfa.offset; + state->type = UNWIND_HINT_TYPE_CALL; } static int read_unwind_hints(struct objtool_file *file) @@ -2304,19 +2296,11 @@ static int read_unwind_hints(struct objtool_file *file) if (sym && sym->bind == STB_GLOBAL) { if (opts.ibt && insn->type != INSN_ENDBR && !insn->noendbr) { - WARN_FUNC("UNWIND_HINT_IRET_REGS without ENDBR", - insn->sec, insn->offset); + WARN_INSN(insn, "UNWIND_HINT_IRET_REGS without ENDBR"); } - - insn->entry = 1; } } - if (hint->type == UNWIND_HINT_TYPE_ENTRY) { - hint->type = UNWIND_HINT_TYPE_CALL; - insn->entry = 1; - } - if (hint->type == UNWIND_HINT_TYPE_FUNC) { insn->cfi = &func_cfi; continue; @@ -2326,15 +2310,13 @@ static int read_unwind_hints(struct objtool_file *file) cfi = *(insn->cfi); if (arch_decode_hint_reg(hint->sp_reg, &cfi.cfa.base)) { - WARN_FUNC("unsupported unwind_hint sp base reg %d", - insn->sec, insn->offset, hint->sp_reg); + WARN_INSN(insn, "unsupported unwind_hint sp base reg %d", hint->sp_reg); return -1; } cfi.cfa.offset = bswap_if_needed(file->elf, hint->sp_offset); cfi.type = hint->type; cfi.signal = hint->signal; - cfi.end = hint->end; insn->cfi = cfi_hash_find_or_add(&cfi); } @@ -2391,8 +2373,7 @@ static int read_retpoline_hints(struct objtool_file *file) insn->type != INSN_CALL_DYNAMIC && insn->type != INSN_RETURN && insn->type != INSN_NOP) { - WARN_FUNC("retpoline_safe hint not an indirect jump/call/ret/nop", - insn->sec, insn->offset); + WARN_INSN(insn, "retpoline_safe hint not an indirect jump/call/ret/nop"); return -1; } @@ -2449,6 +2430,34 @@ static int read_instr_hints(struct objtool_file *file) return 0; } +static int read_validate_unret_hints(struct objtool_file *file) +{ + struct section *sec; + struct instruction *insn; + struct reloc *reloc; + + sec = find_section_by_name(file->elf, ".rela.discard.validate_unret"); + if (!sec) + return 0; + + list_for_each_entry(reloc, &sec->reloc_list, list) { + if (reloc->sym->type != STT_SECTION) { + WARN("unexpected relocation symbol type in %s", sec->name); + return -1; + } + + insn = find_insn(file, reloc->sym->sec, reloc->addend); + if (!insn) { + WARN("bad .discard.instr_end entry"); + return -1; + } + insn->unret = 1; + } + + return 0; +} + + static int read_intra_function_calls(struct objtool_file *file) { struct instruction *insn; @@ -2475,8 +2484,7 @@ static int read_intra_function_calls(struct objtool_file *file) } if (insn->type != INSN_CALL) { - WARN_FUNC("intra_function_call not a direct call", - insn->sec, insn->offset); + WARN_INSN(insn, "intra_function_call not a direct call"); return -1; } @@ -2490,8 +2498,7 @@ static int read_intra_function_calls(struct objtool_file *file) dest_off = arch_jump_destination(insn); insn->jump_dest = find_insn(file, insn->sec, dest_off); if (!insn->jump_dest) { - WARN_FUNC("can't find call dest at %s+0x%lx", - insn->sec, insn->offset, + WARN_INSN(insn, "can't find call dest at %s+0x%lx", insn->sec->name, dest_off); return -1; } @@ -2527,30 +2534,27 @@ static bool is_profiling_func(const char *name) static int classify_symbols(struct objtool_file *file) { - struct section *sec; struct symbol *func; - for_each_sec(file, sec) { - list_for_each_entry(func, &sec->symbol_list, list) { - if (func->bind != STB_GLOBAL) - continue; + for_each_sym(file, func) { + if (func->bind != STB_GLOBAL) + continue; - if (!strncmp(func->name, STATIC_CALL_TRAMP_PREFIX_STR, - strlen(STATIC_CALL_TRAMP_PREFIX_STR))) - func->static_call_tramp = true; + if (!strncmp(func->name, STATIC_CALL_TRAMP_PREFIX_STR, + strlen(STATIC_CALL_TRAMP_PREFIX_STR))) + func->static_call_tramp = true; - if (arch_is_retpoline(func)) - func->retpoline_thunk = true; + if (arch_is_retpoline(func)) + func->retpoline_thunk = true; - if (arch_is_rethunk(func)) - func->return_thunk = true; + if (arch_is_rethunk(func)) + func->return_thunk = true; - if (arch_ftrace_match(func->name)) - func->fentry = true; + if (arch_ftrace_match(func->name)) + func->fentry = true; - if (is_profiling_func(func->name)) - func->profiling_func = true; - } + if (is_profiling_func(func->name)) + func->profiling_func = true; } return 0; @@ -2667,6 +2671,10 @@ static int decode_sections(struct objtool_file *file) if (ret) return ret; + ret = read_validate_unret_hints(file); + if (ret) + return ret; + return 0; } @@ -2828,7 +2836,7 @@ static int update_cfi_state(struct instruction *insn, /* stack operations don't make sense with an undefined CFA */ if (cfa->base == CFI_UNDEFINED) { if (insn_func(insn)) { - WARN_FUNC("undefined stack state", insn->sec, insn->offset); + WARN_INSN(insn, "undefined stack state"); return -1; } return 0; @@ -2977,17 +2985,6 @@ static int update_cfi_state(struct instruction *insn, break; } - if (!cfi->drap && op->src.reg == CFI_SP && - op->dest.reg == CFI_BP && cfa->base == CFI_SP && - check_reg_frame_pos(®s[CFI_BP], -cfa->offset + op->src.offset)) { - - /* lea disp(%rsp), %rbp */ - cfa->base = CFI_BP; - cfa->offset -= op->src.offset; - cfi->bp_scratch = false; - break; - } - if (op->src.reg == CFI_SP && cfa->base == CFI_SP) { /* drap: lea disp(%rsp), %drap */ @@ -3022,8 +3019,7 @@ static int update_cfi_state(struct instruction *insn, } if (op->dest.reg == cfi->cfa.base && !(next_insn && next_insn->hint)) { - WARN_FUNC("unsupported stack register modification", - insn->sec, insn->offset); + WARN_INSN(insn, "unsupported stack register modification"); return -1; } @@ -3033,8 +3029,7 @@ static int update_cfi_state(struct instruction *insn, if (op->dest.reg != CFI_SP || (cfi->drap_reg != CFI_UNDEFINED && cfa->base != CFI_SP) || (cfi->drap_reg == CFI_UNDEFINED && cfa->base != CFI_BP)) { - WARN_FUNC("unsupported stack pointer realignment", - insn->sec, insn->offset); + WARN_INSN(insn, "unsupported stack pointer realignment"); return -1; } @@ -3129,8 +3124,7 @@ static int update_cfi_state(struct instruction *insn, break; default: - WARN_FUNC("unknown stack-related instruction", - insn->sec, insn->offset); + WARN_INSN(insn, "unknown stack-related instruction"); return -1; } @@ -3219,8 +3213,7 @@ static int update_cfi_state(struct instruction *insn, case OP_DEST_MEM: if (op->src.type != OP_SRC_POP && op->src.type != OP_SRC_POPF) { - WARN_FUNC("unknown stack-related memory operation", - insn->sec, insn->offset); + WARN_INSN(insn, "unknown stack-related memory operation"); return -1; } @@ -3232,8 +3225,7 @@ static int update_cfi_state(struct instruction *insn, break; default: - WARN_FUNC("unknown stack-related instruction", - insn->sec, insn->offset); + WARN_INSN(insn, "unknown stack-related instruction"); return -1; } @@ -3272,8 +3264,7 @@ static int propagate_alt_cfi(struct objtool_file *file, struct instruction *insn struct alt_group *orig_group = insn->alt_group->orig_group ?: insn->alt_group; struct instruction *orig = orig_group->first_insn; char *where = offstr(insn->sec, insn->offset); - WARN_FUNC("stack layout conflict in alternatives: %s", - orig->sec, orig->offset, where); + WARN_INSN(orig, "stack layout conflict in alternatives: %s", where); free(where); return -1; } @@ -3300,8 +3291,7 @@ static int handle_insn_ops(struct instruction *insn, if (!state->uaccess_stack) { state->uaccess_stack = 1; } else if (state->uaccess_stack >> 31) { - WARN_FUNC("PUSHF stack exhausted", - insn->sec, insn->offset); + WARN_INSN(insn, "PUSHF stack exhausted"); return 1; } state->uaccess_stack <<= 1; @@ -3333,8 +3323,7 @@ static bool insn_cfi_match(struct instruction *insn, struct cfi_state *cfi2) if (memcmp(&cfi1->cfa, &cfi2->cfa, sizeof(cfi1->cfa))) { - WARN_FUNC("stack state mismatch: cfa1=%d%+d cfa2=%d%+d", - insn->sec, insn->offset, + WARN_INSN(insn, "stack state mismatch: cfa1=%d%+d cfa2=%d%+d", cfi1->cfa.base, cfi1->cfa.offset, cfi2->cfa.base, cfi2->cfa.offset); @@ -3344,8 +3333,7 @@ static bool insn_cfi_match(struct instruction *insn, struct cfi_state *cfi2) sizeof(struct cfi_reg))) continue; - WARN_FUNC("stack state mismatch: reg1[%d]=%d%+d reg2[%d]=%d%+d", - insn->sec, insn->offset, + WARN_INSN(insn, "stack state mismatch: reg1[%d]=%d%+d reg2[%d]=%d%+d", i, cfi1->regs[i].base, cfi1->regs[i].offset, i, cfi2->regs[i].base, cfi2->regs[i].offset); break; @@ -3353,15 +3341,14 @@ static bool insn_cfi_match(struct instruction *insn, struct cfi_state *cfi2) } else if (cfi1->type != cfi2->type) { - WARN_FUNC("stack state mismatch: type1=%d type2=%d", - insn->sec, insn->offset, cfi1->type, cfi2->type); + WARN_INSN(insn, "stack state mismatch: type1=%d type2=%d", + cfi1->type, cfi2->type); } else if (cfi1->drap != cfi2->drap || (cfi1->drap && cfi1->drap_reg != cfi2->drap_reg) || (cfi1->drap && cfi1->drap_offset != cfi2->drap_offset)) { - WARN_FUNC("stack state mismatch: drap1=%d(%d,%d) drap2=%d(%d,%d)", - insn->sec, insn->offset, + WARN_INSN(insn, "stack state mismatch: drap1=%d(%d,%d) drap2=%d(%d,%d)", cfi1->drap, cfi1->drap_reg, cfi1->drap_offset, cfi2->drap, cfi2->drap_reg, cfi2->drap_offset); @@ -3469,20 +3456,17 @@ static int validate_call(struct objtool_file *file, { if (state->noinstr && state->instr <= 0 && !noinstr_call_dest(file, insn, insn_call_dest(insn))) { - WARN_FUNC("call to %s() leaves .noinstr.text section", - insn->sec, insn->offset, call_dest_name(insn)); + WARN_INSN(insn, "call to %s() leaves .noinstr.text section", call_dest_name(insn)); return 1; } if (state->uaccess && !func_uaccess_safe(insn_call_dest(insn))) { - WARN_FUNC("call to %s() with UACCESS enabled", - insn->sec, insn->offset, call_dest_name(insn)); + WARN_INSN(insn, "call to %s() with UACCESS enabled", call_dest_name(insn)); return 1; } if (state->df) { - WARN_FUNC("call to %s() with DF set", - insn->sec, insn->offset, call_dest_name(insn)); + WARN_INSN(insn, "call to %s() with DF set", call_dest_name(insn)); return 1; } @@ -3494,8 +3478,7 @@ static int validate_sibling_call(struct objtool_file *file, struct insn_state *state) { if (insn_func(insn) && has_modified_stack_frame(insn, state)) { - WARN_FUNC("sibling call from callable instruction with modified stack frame", - insn->sec, insn->offset); + WARN_INSN(insn, "sibling call from callable instruction with modified stack frame"); return 1; } @@ -3505,38 +3488,32 @@ static int validate_sibling_call(struct objtool_file *file, static int validate_return(struct symbol *func, struct instruction *insn, struct insn_state *state) { if (state->noinstr && state->instr > 0) { - WARN_FUNC("return with instrumentation enabled", - insn->sec, insn->offset); + WARN_INSN(insn, "return with instrumentation enabled"); return 1; } if (state->uaccess && !func_uaccess_safe(func)) { - WARN_FUNC("return with UACCESS enabled", - insn->sec, insn->offset); + WARN_INSN(insn, "return with UACCESS enabled"); return 1; } if (!state->uaccess && func_uaccess_safe(func)) { - WARN_FUNC("return with UACCESS disabled from a UACCESS-safe function", - insn->sec, insn->offset); + WARN_INSN(insn, "return with UACCESS disabled from a UACCESS-safe function"); return 1; } if (state->df) { - WARN_FUNC("return with DF set", - insn->sec, insn->offset); + WARN_INSN(insn, "return with DF set"); return 1; } if (func && has_modified_stack_frame(insn, state)) { - WARN_FUNC("return with modified stack frame", - insn->sec, insn->offset); + WARN_INSN(insn, "return with modified stack frame"); return 1; } if (state->cfi.bp_scratch) { - WARN_FUNC("BP used as a scratch register", - insn->sec, insn->offset); + WARN_INSN(insn, "BP used as a scratch register"); return 1; } @@ -3608,8 +3585,7 @@ static int validate_branch(struct objtool_file *file, struct symbol *func, } if (func && insn->ignore) { - WARN_FUNC("BUG: why am I validating an ignored function?", - sec, insn->offset); + WARN_INSN(insn, "BUG: why am I validating an ignored function?"); return 1; } @@ -3642,14 +3618,12 @@ static int validate_branch(struct objtool_file *file, struct symbol *func, } if (!save_insn) { - WARN_FUNC("no corresponding CFI save for CFI restore", - sec, insn->offset); + WARN_INSN(insn, "no corresponding CFI save for CFI restore"); return 1; } if (!save_insn->visited) { - WARN_FUNC("objtool isn't smart enough to handle this CFI save/restore combo", - sec, insn->offset); + WARN_INSN(insn, "objtool isn't smart enough to handle this CFI save/restore combo"); return 1; } @@ -3709,8 +3683,7 @@ static int validate_branch(struct objtool_file *file, struct symbol *func, if (opts.stackval && func && !is_fentry_call(insn) && !has_valid_stack_frame(&state)) { - WARN_FUNC("call without frame pointer save/setup", - sec, insn->offset); + WARN_INSN(insn, "call without frame pointer save/setup"); return 1; } @@ -3756,15 +3729,14 @@ static int validate_branch(struct objtool_file *file, struct symbol *func, case INSN_CONTEXT_SWITCH: if (func && (!next_insn || !next_insn->hint)) { - WARN_FUNC("unsupported instruction in callable function", - sec, insn->offset); + WARN_INSN(insn, "unsupported instruction in callable function"); return 1; } return 0; case INSN_STAC: if (state.uaccess) { - WARN_FUNC("recursive UACCESS enable", sec, insn->offset); + WARN_INSN(insn, "recursive UACCESS enable"); return 1; } @@ -3773,12 +3745,12 @@ static int validate_branch(struct objtool_file *file, struct symbol *func, case INSN_CLAC: if (!state.uaccess && func) { - WARN_FUNC("redundant UACCESS disable", sec, insn->offset); + WARN_INSN(insn, "redundant UACCESS disable"); return 1; } if (func_uaccess_safe(func) && !state.uaccess_stack) { - WARN_FUNC("UACCESS-safe disables UACCESS", sec, insn->offset); + WARN_INSN(insn, "UACCESS-safe disables UACCESS"); return 1; } @@ -3787,7 +3759,7 @@ static int validate_branch(struct objtool_file *file, struct symbol *func, case INSN_STD: if (state.df) { - WARN_FUNC("recursive STD", sec, insn->offset); + WARN_INSN(insn, "recursive STD"); return 1; } @@ -3796,7 +3768,7 @@ static int validate_branch(struct objtool_file *file, struct symbol *func, case INSN_CLD: if (!state.df && func) { - WARN_FUNC("redundant CLD", sec, insn->offset); + WARN_INSN(insn, "redundant CLD"); return 1; } @@ -3863,10 +3835,10 @@ static int validate_unwind_hints(struct objtool_file *file, struct section *sec) /* * Validate rethunk entry constraint: must untrain RET before the first RET. * - * Follow every branch (intra-function) and ensure ANNOTATE_UNRET_END comes + * Follow every branch (intra-function) and ensure VALIDATE_UNRET_END comes * before an actual RET instruction. */ -static int validate_entry(struct objtool_file *file, struct instruction *insn) +static int validate_unret(struct objtool_file *file, struct instruction *insn) { struct instruction *next, *dest; int ret, warnings = 0; @@ -3874,10 +3846,10 @@ static int validate_entry(struct objtool_file *file, struct instruction *insn) for (;;) { next = next_insn_to_validate(file, insn); - if (insn->visited & VISITED_ENTRY) + if (insn->visited & VISITED_UNRET) return 0; - insn->visited |= VISITED_ENTRY; + insn->visited |= VISITED_UNRET; if (!insn->ignore_alts && insn->alts) { struct alternative *alt; @@ -3887,7 +3859,7 @@ static int validate_entry(struct objtool_file *file, struct instruction *insn) if (alt->skip_orig) skip_orig = true; - ret = validate_entry(file, alt->insn); + ret = validate_unret(file, alt->insn); if (ret) { if (opts.backtrace) BT_FUNC("(alt)", insn); @@ -3904,18 +3876,17 @@ static int validate_entry(struct objtool_file *file, struct instruction *insn) case INSN_CALL_DYNAMIC: case INSN_JUMP_DYNAMIC: case INSN_JUMP_DYNAMIC_CONDITIONAL: - WARN_FUNC("early indirect call", insn->sec, insn->offset); + WARN_INSN(insn, "early indirect call"); return 1; case INSN_JUMP_UNCONDITIONAL: case INSN_JUMP_CONDITIONAL: if (!is_sibling_call(insn)) { if (!insn->jump_dest) { - WARN_FUNC("unresolved jump target after linking?!?", - insn->sec, insn->offset); + WARN_INSN(insn, "unresolved jump target after linking?!?"); return -1; } - ret = validate_entry(file, insn->jump_dest); + ret = validate_unret(file, insn->jump_dest); if (ret) { if (opts.backtrace) { BT_FUNC("(branch%s)", insn, @@ -3940,7 +3911,7 @@ static int validate_entry(struct objtool_file *file, struct instruction *insn) return -1; } - ret = validate_entry(file, dest); + ret = validate_unret(file, dest); if (ret) { if (opts.backtrace) BT_FUNC("(call)", insn); @@ -3953,7 +3924,7 @@ static int validate_entry(struct objtool_file *file, struct instruction *insn) return 0; case INSN_RETURN: - WARN_FUNC("RET before UNTRAIN", insn->sec, insn->offset); + WARN_INSN(insn, "RET before UNTRAIN"); return 1; case INSN_NOP: @@ -3966,7 +3937,7 @@ static int validate_entry(struct objtool_file *file, struct instruction *insn) } if (!next) { - WARN_FUNC("teh end!", insn->sec, insn->offset); + WARN_INSN(insn, "teh end!"); return -1; } insn = next; @@ -3976,21 +3947,21 @@ static int validate_entry(struct objtool_file *file, struct instruction *insn) } /* - * Validate that all branches starting at 'insn->entry' encounter UNRET_END - * before RET. + * Validate that all branches starting at VALIDATE_UNRET_BEGIN encounter + * VALIDATE_UNRET_END before RET. */ -static int validate_unret(struct objtool_file *file) +static int validate_unrets(struct objtool_file *file) { struct instruction *insn; int ret, warnings = 0; for_each_insn(file, insn) { - if (!insn->entry) + if (!insn->unret) continue; - ret = validate_entry(file, insn); + ret = validate_unret(file, insn); if (ret < 0) { - WARN_FUNC("Failed UNRET validation", insn->sec, insn->offset); + WARN_INSN(insn, "Failed UNRET validation"); return ret; } warnings += ret; @@ -4018,13 +3989,11 @@ static int validate_retpoline(struct objtool_file *file) if (insn->type == INSN_RETURN) { if (opts.rethunk) { - WARN_FUNC("'naked' return found in RETHUNK build", - insn->sec, insn->offset); + WARN_INSN(insn, "'naked' return found in RETHUNK build"); } else continue; } else { - WARN_FUNC("indirect %s found in RETPOLINE build", - insn->sec, insn->offset, + WARN_INSN(insn, "indirect %s found in RETPOLINE build", insn->type == INSN_JUMP_DYNAMIC ? "jump" : "call"); } @@ -4121,8 +4090,7 @@ static bool ignore_unreachable_insn(struct objtool_file *file, struct instructio * It may also insert a UD2 after calling a __noreturn function. */ prev_insn = prev_insn_same_sec(file, insn); - if ((prev_insn->dead_end || - dead_end_function(file, insn_call_dest(prev_insn))) && + if (prev_insn->dead_end && (insn->type == INSN_BUG || (insn->type == INSN_JUMP_UNCONDITIONAL && insn->jump_dest && insn->jump_dest->type == INSN_BUG))) @@ -4158,54 +4126,75 @@ static bool ignore_unreachable_insn(struct objtool_file *file, struct instructio return false; } -static int add_prefix_symbol(struct objtool_file *file, struct symbol *func, - struct instruction *insn) +static int add_prefix_symbol(struct objtool_file *file, struct symbol *func) { - if (!opts.prefix) - return 0; + struct instruction *insn, *prev; + struct cfi_state *cfi; - for (;;) { - struct instruction *prev = prev_insn_same_sec(file, insn); - u64 offset; + insn = find_insn(file, func->sec, func->offset); + if (!insn) + return -1; - if (!prev) - break; + for (prev = prev_insn_same_sec(file, insn); + prev; + prev = prev_insn_same_sec(file, prev)) { + u64 offset; if (prev->type != INSN_NOP) - break; + return -1; offset = func->offset - prev->offset; - if (offset >= opts.prefix) { - if (offset == opts.prefix) { - /* - * Since the sec->symbol_list is ordered by - * offset (see elf_add_symbol()) the added - * symbol will not be seen by the iteration in - * validate_section(). - * - * Hence the lack of list_for_each_entry_safe() - * there. - * - * The direct concequence is that prefix symbols - * don't get visited (because pointless), except - * for the logic in ignore_unreachable_insn() - * that needs the terminating insn to be visited - * otherwise it will report the hole. - * - * Hence mark the first instruction of the - * prefix symbol as visisted. - */ - prev->visited |= VISITED_BRANCH; - elf_create_prefix_symbol(file->elf, func, opts.prefix); - } - break; - } - insn = prev; + + if (offset > opts.prefix) + return -1; + + if (offset < opts.prefix) + continue; + + elf_create_prefix_symbol(file->elf, func, opts.prefix); + break; } + if (!prev) + return -1; + + if (!insn->cfi) { + /* + * This can happen if stack validation isn't enabled or the + * function is annotated with STACK_FRAME_NON_STANDARD. + */ + return 0; + } + + /* Propagate insn->cfi to the prefix code */ + cfi = cfi_hash_find_or_add(insn->cfi); + for (; prev != insn; prev = next_insn_same_sec(file, prev)) + prev->cfi = cfi; + return 0; } +static int add_prefix_symbols(struct objtool_file *file) +{ + struct section *sec; + struct symbol *func; + int warnings = 0; + + for_each_sec(file, sec) { + if (!(sec->sh.sh_flags & SHF_EXECINSTR)) + continue; + + sec_for_each_sym(sec, func) { + if (func->type != STT_FUNC) + continue; + + add_prefix_symbol(file, func); + } + } + + return warnings; +} + static int validate_symbol(struct objtool_file *file, struct section *sec, struct symbol *sym, struct insn_state *state) { @@ -4224,8 +4213,6 @@ static int validate_symbol(struct objtool_file *file, struct section *sec, if (!insn || insn->ignore || insn->visited) return 0; - add_prefix_symbol(file, sym, insn); - state->uaccess = sym->uaccess_safe; ret = validate_branch(file, insn_func(insn), insn, *state); @@ -4240,7 +4227,7 @@ static int validate_section(struct objtool_file *file, struct section *sec) struct symbol *func; int warnings = 0; - list_for_each_entry(func, &sec->symbol_list, list) { + sec_for_each_sym(sec, func) { if (func->type != STT_FUNC) continue; @@ -4403,9 +4390,7 @@ static int validate_ibt_insn(struct objtool_file *file, struct instruction *insn if (noendbr_range(file, dest)) continue; - WARN_FUNC("relocation to !ENDBR: %s", - insn->sec, insn->offset, - offstr(dest->sec, dest->offset)); + WARN_INSN(insn, "relocation to !ENDBR: %s", offstr(dest->sec, dest->offset)); warnings++; } @@ -4507,16 +4492,14 @@ static int validate_sls(struct objtool_file *file) switch (insn->type) { case INSN_RETURN: if (!next_insn || next_insn->type != INSN_TRAP) { - WARN_FUNC("missing int3 after ret", - insn->sec, insn->offset); + WARN_INSN(insn, "missing int3 after ret"); warnings++; } break; case INSN_JUMP_DYNAMIC: if (!next_insn || next_insn->type != INSN_TRAP) { - WARN_FUNC("missing int3 after indirect jump", - insn->sec, insn->offset); + WARN_INSN(insn, "missing int3 after indirect jump"); warnings++; } break; @@ -4539,7 +4522,7 @@ static int validate_reachable_instructions(struct objtool_file *file) if (insn->visited || ignore_unreachable_insn(file, insn)) continue; - WARN_FUNC("unreachable instruction", insn->sec, insn->offset); + WARN_INSN(insn, "unreachable instruction"); return 1; } @@ -4607,7 +4590,7 @@ int check(struct objtool_file *file) * Must be after validate_branch() and friends, it plays * further games with insn->visited. */ - ret = validate_unret(file); + ret = validate_unrets(file); if (ret < 0) return ret; warnings += ret; @@ -4669,6 +4652,13 @@ int check(struct objtool_file *file) warnings += ret; } + if (opts.prefix) { + ret = add_prefix_symbols(file); + if (ret < 0) + return ret; + warnings += ret; + } + if (opts.ibt) { ret = create_ibt_endbr_seal_sections(file); if (ret < 0) diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c index 6806ce01d933..500e92979a31 100644 --- a/tools/objtool/elf.c +++ b/tools/objtool/elf.c @@ -474,7 +474,7 @@ static int read_symbols(struct elf *elf) /* Create parent/child links for any cold subfunctions */ list_for_each_entry(sec, &elf->sections, list) { - list_for_each_entry(sym, &sec->symbol_list, list) { + sec_for_each_sym(sec, sym) { char pname[MAX_NAME_LEN + 1]; size_t pnamelen; if (sym->type != STT_FUNC) diff --git a/tools/objtool/include/objtool/check.h b/tools/objtool/include/objtool/check.h index 3e7c7004f7df..daa46f1f0965 100644 --- a/tools/objtool/include/objtool/check.h +++ b/tools/objtool/include/objtool/check.h @@ -61,7 +61,7 @@ struct instruction { restore : 1, retpoline_safe : 1, noendbr : 1, - entry : 1, + unret : 1, visited : 4, no_reloc : 1; /* 10 bit hole */ @@ -92,7 +92,7 @@ static inline struct symbol *insn_func(struct instruction *insn) #define VISITED_BRANCH 0x01 #define VISITED_BRANCH_UACCESS 0x02 #define VISITED_BRANCH_MASK 0x03 -#define VISITED_ENTRY 0x04 +#define VISITED_UNRET 0x04 static inline bool is_static_jump(struct instruction *insn) { diff --git a/tools/objtool/include/objtool/elf.h b/tools/objtool/include/objtool/elf.h index ad0024da262b..e1ca588eb69d 100644 --- a/tools/objtool/include/objtool/elf.h +++ b/tools/objtool/include/objtool/elf.h @@ -188,4 +188,13 @@ struct symbol *find_func_containing(struct section *sec, unsigned long offset); #define for_each_sec(file, sec) \ list_for_each_entry(sec, &file->elf->sections, list) +#define sec_for_each_sym(sec, sym) \ + list_for_each_entry(sym, &sec->symbol_list, list) + +#define for_each_sym(file, sym) \ + for (struct section *__sec, *__fake = (struct section *)1; \ + __fake; __fake = NULL) \ + for_each_sec(file, __sec) \ + sec_for_each_sym(__sec, sym) + #endif /* _OBJTOOL_ELF_H */ diff --git a/tools/objtool/include/objtool/warn.h b/tools/objtool/include/objtool/warn.h index a3e79ae75f2e..b1c920dc9516 100644 --- a/tools/objtool/include/objtool/warn.h +++ b/tools/objtool/include/objtool/warn.h @@ -53,6 +53,11 @@ static inline char *offstr(struct section *sec, unsigned long offset) free(_str); \ }) +#define WARN_INSN(insn, format, ...) \ +({ \ + WARN_FUNC(format, insn->sec, insn->offset, ##__VA_ARGS__); \ +}) + #define BT_FUNC(format, insn, ...) \ ({ \ struct instruction *_insn = (insn); \ diff --git a/tools/objtool/orc_dump.c b/tools/objtool/orc_dump.c index 2d8ebdcd1db3..0e183bb1c720 100644 --- a/tools/objtool/orc_dump.c +++ b/tools/objtool/orc_dump.c @@ -4,7 +4,6 @@ */ #include <unistd.h> -#include <linux/objtool.h> #include <asm/orc_types.h> #include <objtool/objtool.h> #include <objtool/warn.h> @@ -39,11 +38,15 @@ static const char *reg_name(unsigned int reg) static const char *orc_type_name(unsigned int type) { switch (type) { - case UNWIND_HINT_TYPE_CALL: + case ORC_TYPE_UNDEFINED: + return "(und)"; + case ORC_TYPE_END_OF_STACK: + return "end"; + case ORC_TYPE_CALL: return "call"; - case UNWIND_HINT_TYPE_REGS: + case ORC_TYPE_REGS: return "regs"; - case UNWIND_HINT_TYPE_REGS_PARTIAL: + case ORC_TYPE_REGS_PARTIAL: return "regs (partial)"; default: return "?"; @@ -202,6 +205,7 @@ int orc_dump(const char *_objname) printf("%llx:", (unsigned long long)(orc_ip_addr + (i * sizeof(int)) + orc_ip[i])); } + printf("type:%s", orc_type_name(orc[i].type)); printf(" sp:"); @@ -211,8 +215,7 @@ int orc_dump(const char *_objname) print_reg(orc[i].bp_reg, bswap_if_needed(&dummy_elf, orc[i].bp_offset)); - printf(" type:%s signal:%d end:%d\n", - orc_type_name(orc[i].type), orc[i].signal, orc[i].end); + printf(" signal:%d\n", orc[i].signal); } elf_end(elf); diff --git a/tools/objtool/orc_gen.c b/tools/objtool/orc_gen.c index 57a4527d5988..48efd1e2f00d 100644 --- a/tools/objtool/orc_gen.c +++ b/tools/objtool/orc_gen.c @@ -6,7 +6,7 @@ #include <stdlib.h> #include <string.h> -#include <linux/objtool.h> +#include <linux/objtool_types.h> #include <asm/orc_types.h> #include <objtool/check.h> @@ -21,19 +21,38 @@ static int init_orc_entry(struct orc_entry *orc, struct cfi_state *cfi, memset(orc, 0, sizeof(*orc)); if (!cfi) { - orc->end = 0; - orc->sp_reg = ORC_REG_UNDEFINED; + /* + * This is usually either unreachable nops/traps (which don't + * trigger unreachable instruction warnings), or + * STACK_FRAME_NON_STANDARD functions. + */ + orc->type = ORC_TYPE_UNDEFINED; return 0; } - orc->end = cfi->end; - orc->signal = cfi->signal; - - if (cfi->cfa.base == CFI_UNDEFINED) { - orc->sp_reg = ORC_REG_UNDEFINED; + switch (cfi->type) { + case UNWIND_HINT_TYPE_UNDEFINED: + orc->type = ORC_TYPE_UNDEFINED; + return 0; + case UNWIND_HINT_TYPE_END_OF_STACK: + orc->type = ORC_TYPE_END_OF_STACK; return 0; + case UNWIND_HINT_TYPE_CALL: + orc->type = ORC_TYPE_CALL; + break; + case UNWIND_HINT_TYPE_REGS: + orc->type = ORC_TYPE_REGS; + break; + case UNWIND_HINT_TYPE_REGS_PARTIAL: + orc->type = ORC_TYPE_REGS_PARTIAL; + break; + default: + WARN_INSN(insn, "unknown unwind hint type %d", cfi->type); + return -1; } + orc->signal = cfi->signal; + switch (cfi->cfa.base) { case CFI_SP: orc->sp_reg = ORC_REG_SP; @@ -60,8 +79,7 @@ static int init_orc_entry(struct orc_entry *orc, struct cfi_state *cfi, orc->sp_reg = ORC_REG_DX; break; default: - WARN_FUNC("unknown CFA base reg %d", - insn->sec, insn->offset, cfi->cfa.base); + WARN_INSN(insn, "unknown CFA base reg %d", cfi->cfa.base); return -1; } @@ -76,14 +94,12 @@ static int init_orc_entry(struct orc_entry *orc, struct cfi_state *cfi, orc->bp_reg = ORC_REG_BP; break; default: - WARN_FUNC("unknown BP base reg %d", - insn->sec, insn->offset, bp->base); + WARN_INSN(insn, "unknown BP base reg %d", bp->base); return -1; } orc->sp_offset = cfi->cfa.offset; orc->bp_offset = bp->offset; - orc->type = cfi->type; return 0; } @@ -148,11 +164,7 @@ int orc_create(struct objtool_file *file) struct orc_list_entry *entry; struct list_head orc_list; - struct orc_entry null = { - .sp_reg = ORC_REG_UNDEFINED, - .bp_reg = ORC_REG_UNDEFINED, - .type = UNWIND_HINT_TYPE_CALL, - }; + struct orc_entry null = { .type = ORC_TYPE_UNDEFINED }; /* Build a deduplicated list of ORC entries: */ INIT_LIST_HEAD(&orc_list); diff --git a/tools/objtool/sync-check.sh b/tools/objtool/sync-check.sh index 105a291ff8e7..81d120d05442 100755 --- a/tools/objtool/sync-check.sh +++ b/tools/objtool/sync-check.sh @@ -6,7 +6,7 @@ if [ -z "$SRCARCH" ]; then exit 1 fi -FILES="include/linux/objtool.h" +FILES="include/linux/objtool_types.h" if [ "$SRCARCH" = "x86" ]; then FILES="$FILES |