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x86/traps: Clarify KCFI instruction layout

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Just a nit-picky change to the KCFI indirect call check instruction
documentation. The addl offset isn't always -4 (it depends on patchable
function entry configuration).

Signed-off-by: Kees Cook <kees@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250904034656.3670313-2-kees@kernel.org
This commit is contained in:
Kees Cook 2025-09-03 20:46:41 -07:00 committed by Peter Zijlstra
parent 038c7dc66e
commit 628a15e053
1 changed files with 1 additions and 1 deletions
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arch/x86/kernel/cfi.c
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@ -27,7 +27,7 @@ static bool decode_cfi_insn(struct pt_regs *regs, unsigned long *target,
* for indirect call checks:
*
*   movl -<id>, %r10d ; 6 bytes
* addl -4(%reg), %r10d ; 4 bytes
* addl -<pos>(%reg), %r10d; 4 bytes
* je .Ltmp1 ; 2 bytes
* ud2 ; <- regs->ip
* .Ltmp1: