Commit-ID: 1ad33f5aec20f53785dbad44c6fb3b204aefd921 Gitweb: https://git.kernel.org/tip/1ad33f5aec20f53785dbad44c6fb3b204aefd921 Author: Andy Lutomirski <l...@kernel.org> AuthorDate: Mon, 19 Nov 2018 14:45:32 -0800 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Tue, 20 Nov 2018 08:44:30 +0100
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 <l...@kernel.org> Cc: Andy Lutomirski <l...@amacapital.net> Cc: Borislav Petkov <b...@alien8.de> Cc: Brian Gerst <brge...@gmail.com> Cc: Dave Hansen <dave.han...@linux.intel.com> Cc: Denys Vlasenko <dvlas...@redhat.com> Cc: H. Peter Anvin <h...@zytor.com> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Rik van Riel <r...@surriel.com> Cc: Thomas Gleixner <t...@linutronix.de> Cc: Yu-cheng Yu <yu-cheng...@intel.com> Link: http://lkml.kernel.org/r/d418022aa0fad9cb40467aa7acaf4e95be50ee96.1542667307.git.l...@kernel.org Signed-off-by: Ingo Molnar <mi...@kernel.org> --- arch/x86/mm/fault.c | 8 -------- 1 file changed, 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;
