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| author |   Andy Lutomirski <luto@kernel.org> | 2018-11-19 14:45:32 -0800 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2018-11-20 08:44:30 +0100 |
| commit | 1ad33f5aec20f53785dbad44c6fb3b204aefd921 (patch) | |
| tree | 366fd9437bbb179b693b15b5f5817e594a137022 /arch/x86/mm/fault.c | |
| parent | x86/fault: Make error_code sanitization more robust (diff) | |
| download | linux-dev-1ad33f5aec20f53785dbad44c6fb3b204aefd921.tar.xz linux-dev-1ad33f5aec20f53785dbad44c6fb3b204aefd921.zip | |
x86/fault: Don't set thread.cr2, etc before OOPSing
The fault handling code sets the cr2, trap_nr, and error_code fields
in thread_struct before OOPSing. No one reads those fields during
an OOPS, so remove the code to set them.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/d418022aa0fad9cb40467aa7acaf4e95be50ee96.1542667307.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/mm/fault.c')
| -rw-r--r-- | arch/x86/mm/fault.c | 8 |
1 files changed, 0 insertions, 8 deletions
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index b5ec1ca2f4a0..b898a38093a3 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -621,10 +621,6 @@ pgtable_bad(struct pt_regs *regs, unsigned long error_code, tsk->comm, address); dump_pagetable(address); - tsk->thread.cr2 = address; - tsk->thread.trap_nr = X86_TRAP_PF; - tsk->thread.error_code = error_code; - if (__die("Bad pagetable", regs, error_code)) sig = 0; @@ -753,10 +749,6 @@ no_context(struct pt_regs *regs, unsigned long error_code, if (task_stack_end_corrupted(tsk)) printk(KERN_EMERG "Thread overran stack, or stack corrupted\n"); - tsk->thread.cr2 = address; - tsk->thread.trap_nr = X86_TRAP_PF; - tsk->thread.error_code = error_code; - sig = SIGKILL; if (__die("Oops", regs, error_code)) sig = 0; |