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ubsan: Add awareness of signed integer overflow traps

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On arm64, UBSAN traps can be decoded from the trap instruction. Add the
add, sub, and mul overflow trap codes now that CONFIG_UBSAN_SIGNED_WRAP
exists. Seen under clang 19:

  Internal error: UBSAN: unrecognized failure code: 00000000f2005515 [#1] PREEMPT SMP

Reported-by: Nathan Chancellor <nathan@kernel.org>
Closes: https://lore.kernel.org/lkml/20240411-fix-ubsan-in-hardening-config-v1-0-e0177c80ffaa@kernel.org
Fixes: 557f8c582a ("ubsan: Reintroduce signed overflow sanitizer")
Tested-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/20240415182832.work.932-kees@kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Kees Cook 2024-04-15 11:28:35 -07:00
parent 7fcb91d94e
commit f4626c12e4
1 changed files with 16 additions and 2 deletions
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18
lib/ubsan.c
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@ -44,9 +44,10 @@ const char *report_ubsan_failure(struct pt_regs *regs, u32 check_type)
case ubsan_shift_out_of_bounds:
return "UBSAN: shift out of bounds";
#endif
#ifdef CONFIG_UBSAN_DIV_ZERO
#if defined(CONFIG_UBSAN_DIV_ZERO) || defined(CONFIG_UBSAN_SIGNED_WRAP)
/*
* SanitizerKind::IntegerDivideByZero emits
* SanitizerKind::IntegerDivideByZero and
* SanitizerKind::SignedIntegerOverflow emit
* SanitizerHandler::DivremOverflow.
*/
case ubsan_divrem_overflow:
@ -77,6 +78,19 @@ const char *report_ubsan_failure(struct pt_regs *regs, u32 check_type)
return "UBSAN: alignment assumption";
case ubsan_type_mismatch:
return "UBSAN: type mismatch";
#endif
#ifdef CONFIG_UBSAN_SIGNED_WRAP
/*
* SanitizerKind::SignedIntegerOverflow emits
* SanitizerHandler::AddOverflow, SanitizerHandler::SubOverflow,
* or SanitizerHandler::MulOverflow.
*/
case ubsan_add_overflow:
return "UBSAN: integer addition overflow";
case ubsan_sub_overflow:
return "UBSAN: integer subtraction overflow";
case ubsan_mul_overflow:
return "UBSAN: integer multiplication overflow";
#endif
default:
return "UBSAN: unrecognized failure code";