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x86/fault/32: Move is_f00f_bug() to do_kern_addr_fault()

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bad_area() and its relatives are called from many places in fault.c, and
exactly one of them wants the F00F workaround.

__bad_area_nosemaphore() no longer contains any kernel fault code, which
prepares for further cleanups.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/e9668729a48ce6754022b0a4415631e8ebdd00e7.1612924255.git.luto@kernel.org
This commit is contained in:
Andy Lutomirski 2021-02-09 18:33:36 -08:00 committed by Borislav Petkov
parent ec352711ce
commit f42a40fd53
1 changed files with 7 additions and 5 deletions
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12
arch/x86/mm/fault.c
View file

@ -482,10 +482,12 @@ static int is_errata100(struct pt_regs *regs, unsigned long address)
}
/* Pentium F0 0F C7 C8 bug workaround: */
static int is_f00f_bug(struct pt_regs *regs, unsigned long address)
static int is_f00f_bug(struct pt_regs *regs, unsigned long error_code,
unsigned long address)
{
#ifdef CONFIG_X86_F00F_BUG
if (boot_cpu_has_bug(X86_BUG_F00F) && idt_is_f00f_address(address)) {
if (boot_cpu_has_bug(X86_BUG_F00F) && !(error_code & X86_PF_USER) &&
idt_is_f00f_address(address)) {
handle_invalid_op(regs);
return 1;
}
@ -853,9 +855,6 @@ __bad_area_nosemaphore(struct pt_regs *regs, unsigned long error_code,
return;
}
if (is_f00f_bug(regs, address))
return;
no_context(regs, error_code, address, SIGSEGV, si_code);
}
@ -1195,6 +1194,9 @@ do_kern_addr_fault(struct pt_regs *regs, unsigned long hw_error_code,
}
#endif
if (is_f00f_bug(regs, hw_error_code, address))
return;
/* Was the fault spurious, caused by lazy TLB invalidation? */
if (spurious_kernel_fault(hw_error_code, address))
return;