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| author | Andy Lutomirski <luto@kernel.org> | 2016-08-30 17:27:57 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-09-08 08:47:20 +0200 |
| commit | 6271cfdfc0e4731b76921ef02fdd87409d71dfdf (patch) | |
| tree | b1af2c82308a83478a5407406b17bad499c3a222 /arch/x86/kernel/traps.c | |
| parent | 2b3061c77ce7e429b25a25560ba088e8e7193a67 (diff) | |
| download | op-kernel-dev-6271cfdfc0e4731b76921ef02fdd87409d71dfdf.zip op-kernel-dev-6271cfdfc0e4731b76921ef02fdd87409d71dfdf.tar.gz | |
x86/mm: Improve stack-overflow #PF handling
If we get a page fault indicating kernel stack overflow, invoke
handle_stack_overflow(). To prevent us from overflowing the stack
again while handling the overflow (because we are likely to have
very little stack space left), call handle_stack_overflow() on the
double-fault stack.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/6d6cf96b3fb9b4c9aa303817e1dc4de0c7c36487.1472603235.git.luto@kernel.org
[ Minor edit. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/traps.c')
| -rw-r--r-- | arch/x86/kernel/traps.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index 907b4e4..bd4e3d4 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -293,9 +293,9 @@ DO_ERROR(X86_TRAP_SS, SIGBUS, "stack segment", stack_segment) DO_ERROR(X86_TRAP_AC, SIGBUS, "alignment check", alignment_check) #ifdef CONFIG_VMAP_STACK -static void __noreturn handle_stack_overflow(const char *message, - struct pt_regs *regs, - unsigned long fault_address) +__visible void __noreturn handle_stack_overflow(const char *message, + struct pt_regs *regs, + unsigned long fault_address) { printk(KERN_EMERG "BUG: stack guard page was hit at %p (stack is %p..%p)\n", (void *)fault_address, current->stack, |
