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| author | Andy Lutomirski <luto@kernel.org> | 2015-07-30 20:32:40 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-08-04 10:16:54 +0200 |
| commit | e5779e8e12299f77c2421a707855d8d124171d85 (patch) | |
| tree | cb527ea37574379a35826c9292dc956cfc7b7433 /include | |
| parent | ae3f011fc25104a218caf4448b1d47ef1c9b3a42 (diff) | |
| download | lwn-e5779e8e12299f77c2421a707855d8d124171d85.tar.gz lwn-e5779e8e12299f77c2421a707855d8d124171d85.zip | |
perf/x86/hw_breakpoints: Disallow kernel breakpoints unless kprobe-safe
Code on the kprobe blacklist doesn't want unexpected int3
exceptions. It probably doesn't want unexpected debug exceptions
either. Be safe: disallow breakpoints in nokprobes code.
On non-CONFIG_KPROBES kernels, there is no kprobe blacklist. In
that case, disallow kernel breakpoints entirely.
It will be particularly important to keep hw breakpoints out of the
entry and NMI code once we move debug exceptions off the IST stack.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/e14b152af99640448d895e3c2a8c2d5ee19a1325.1438312874.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/kprobes.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h index 1ab54754a86d..8f6849084248 100644 --- a/include/linux/kprobes.h +++ b/include/linux/kprobes.h @@ -267,6 +267,8 @@ extern void show_registers(struct pt_regs *regs); extern void kprobes_inc_nmissed_count(struct kprobe *p); extern bool arch_within_kprobe_blacklist(unsigned long addr); +extern bool within_kprobe_blacklist(unsigned long addr); + struct kprobe_insn_cache { struct mutex mutex; void *(*alloc)(void); /* allocate insn page */ |