Linux kernel documentation tree maintained by Jonathan Corbet http://mirrors.hust.edu.cn/git/lwn.git/atom?h=v5.12-rc3 2021-03-14T21:41:02+00:00 2021-03-14T21:41:02+00:00 Linus Torvalds torvalds@linux-foundation.org 2021-03-14T21:41:02+00:00 urn:sha1:1e28eed17697bcf343c6743f0028cc3b5dd88bf0 2021-03-14T21:33:27+00:00 Alexey Dobriyan adobriyan@gmail.com 2021-03-14T20:51:14+00:00 urn:sha1:c995f12ad8842dbf5cfed113fb52cdd083f5afd1 Doing a prctl(PR_SET_MM, PR_SET_MM_AUXV, addr, 1); will copy 1 byte from userspace to (quite big) on-stack array and then stash everything to mm->saved_auxv. AT_NULL terminator will be inserted at the very end. /proc/*/auxv handler will find that AT_NULL terminator and copy original stack contents to userspace. This devious scheme requires CAP_SYS_RESOURCE. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> 2021-03-14T20:33:33+00:00 Linus Torvalds torvalds@linux-foundation.org 2021-03-14T20:33:33+00:00 urn:sha1:70404fe3030ec2dcf339a9730bc03bf0e1f2acf5 Pull irq fixes from Thomas Gleixner: "A set of irqchip updates: - Make the GENERIC_IRQ_MULTI_HANDLER configuration correct - Add a missing DT compatible string for the Ingenic driver - Remove the pointless debugfs_file pointer from struct irqdomain" * tag 'irq-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: irqchip/ingenic: Add support for the JZ4760 dt-bindings/irq: Add compatible string for the JZ4760B irqchip: Do not blindly select CONFIG_GENERIC_IRQ_MULTI_HANDLER ARM: ep93xx: Select GENERIC_IRQ_MULTI_HANDLER directly irqdomain: Remove debugfs_file from struct irq_domain 2021-03-14T20:29:38+00:00 Linus Torvalds torvalds@linux-foundation.org 2021-03-14T20:29:38+00:00 urn:sha1:802b31c0dd7f44c9ab44d39c6c4af22d958ad803 Pull timer fix from Thomas Gleixner: "A single fix in for hrtimers to prevent an interrupt storm caused by the lack of reevaluation of the timers which expire in softirq context under certain circumstances, e.g. when the clock was set" * tag 'timers-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: hrtimer: Update softirq_expires_next correctly after __hrtimer_get_next_event() 2021-03-14T20:27:06+00:00 Linus Torvalds torvalds@linux-foundation.org 2021-03-14T20:27:06+00:00 urn:sha1:c72cbc936141eac737b24f43e742cefaab35edd6 Pull scheduler fixes from Thomas Gleixner: "A set of scheduler updates: - Prevent a NULL pointer dereference in the migration_stop_cpu() mechanims - Prevent self concurrency of affine_move_task() - Small fixes and cleanups related to task migration/affinity setting - Ensure that sync_runqueues_membarrier_state() is invoked on the current CPU when it is in the cpu mask" * tag 'sched-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: sched/membarrier: fix missing local execution of ipi_sync_rq_state() sched: Simplify set_affinity_pending refcounts sched: Fix affine_move_task() self-concurrency sched: Optimize migration_cpu_stop() sched: Collate affine_move_task() stoppers sched: Simplify migration_cpu_stop() sched: Fix migration_cpu_stop() requeueing 2021-03-14T20:15:55+00:00 Linus Torvalds torvalds@linux-foundation.org 2021-03-14T20:15:55+00:00 urn:sha1:19469d2adab9a94e3c1713b7a12a67f9c59c1161 Pull objtool fix from Thomas Gleixner: "A single objtool fix to handle the PUSHF/POPF validation correctly for the paravirt changes which modified arch_local_irq_restore not to use popf" * tag 'objtool-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: objtool,x86: Fix uaccess PUSHF/POPF validation 2021-03-14T20:03:21+00:00 Linus Torvalds torvalds@linux-foundation.org 2021-03-14T20:03:21+00:00 urn:sha1:fa509ff879f816ce50800d20fc87564b69f53962 Pull locking fixes from Thomas Gleixner: "A couple of locking fixes: - A fix for the static_call mechanism so it handles unaligned addresses correctly. - Make u64_stats_init() a macro so every instance gets a seperate lockdep key. - Make seqcount_latch_init() a macro as well to preserve the static variable which is used for the lockdep key" * tag 'locking-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: seqlock,lockdep: Fix seqcount_latch_init() u64_stats,lockdep: Fix u64_stats_init() vs lockdep static_call: Fix the module key fixup 2021-03-14T19:57:17+00:00 Linus Torvalds torvalds@linux-foundation.org 2021-03-14T19:57:17+00:00 urn:sha1:75013c6c52d80b2255ba273eedac013d58754b02 Pull perf fixes from Borislav Petkov: - Make sure PMU internal buffers are flushed for per-CPU events too and properly handle PID/TID for large PEBS. - Handle the case properly when there's no PMU and therefore return an empty list of perf MSRs for VMX to switch instead of reading random garbage from the stack. * tag 'perf_urgent_for_v5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/perf: Use RET0 as default for guest_get_msrs to handle "no PMU" case perf/x86/intel: Set PERF_ATTACH_SCHED_CB for large PEBS and LBR perf/core: Flush PMU internal buffers for per-CPU events 2021-03-14T19:54:56+00:00 Linus Torvalds torvalds@linux-foundation.org 2021-03-14T19:54:56+00:00 urn:sha1:836d7f0572ca42ac85d649235680479740743ac6 Pull EFI fix from Ard Biesheuvel via Borislav Petkov: "Fix an oversight in the handling of EFI_RT_PROPERTIES_TABLE, which was added v5.10, but failed to take the SetVirtualAddressMap() RT service into account" * tag 'efi-urgent-for-v5.12-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: efi: stub: omit SetVirtualAddressMap() if marked unsupported in RT_PROP table 2021-03-14T19:48:10+00:00 Linus Torvalds torvalds@linux-foundation.org 2021-03-14T19:48:10+00:00 urn:sha1:0a7c10df49eb69dd888ea8b8ddd29bde2aa2fd48 Pull x86 fixes from Borislav Petkov: - A couple of SEV-ES fixes and robustifications: verify usermode stack pointer in NMI is not coming from the syscall gap, correctly track IRQ states in the #VC handler and access user insn bytes atomically in same handler as latter cannot sleep. - Balance 32-bit fast syscall exit path to do the proper work on exit and thus not confuse audit and ptrace frameworks. - Two fixes for the ORC unwinder going "off the rails" into KASAN redzones and when ORC data is missing. * tag 'x86_urgent_for_v5.12_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/sev-es: Use __copy_from_user_inatomic() x86/sev-es: Correctly track IRQ states in runtime #VC handler x86/sev-es: Check regs->sp is trusted before adjusting #VC IST stack x86/sev-es: Introduce ip_within_syscall_gap() helper x86/entry: Fix entry/exit mismatch on failed fast 32-bit syscalls x86/unwind/orc: Silence warnings caused by missing ORC data x86/unwind/orc: Disable KASAN checking in the ORC unwinder, part 2