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ubsan: Avoid i386 UBSAN handler crashes with Clang 

When generating Runtime Calls, Clang doesn't respect the -mregparm=3
option used on i386. Hopefully this will be fixed correctly in Clang 19:
https://github.com/llvm/llvm-project/pull/89707
but we need to fix this for earlier Clang versions today. Force the
calling convention to use non-register arguments.

Reported-by: Erhard Furtner <erhard_f@mailbox.org>
Closes: https://github.com/KSPP/linux/issues/350
Link: https://lore.kernel.org/r/20240424224026.it.216-kees@kernel.org
Acked-by: Nathan Chancellor <nathan@kernel.org>
Acked-by: Justin Stitt <justinstitt@google.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Kees Cook 2024-04-24 15:40:29 -07:00
parent c209826737
commit 2e431b23a1
1 changed files with 27 additions and 14 deletions
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41
lib/ubsan.h
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@ -124,19 +124,32 @@ typedef s64 s_max;
typedef u64 u_max;
#endif
void __ubsan_handle_add_overflow(void *data, void *lhs, void *rhs);
void __ubsan_handle_sub_overflow(void *data, void *lhs, void *rhs);
void __ubsan_handle_mul_overflow(void *data, void *lhs, void *rhs);
void __ubsan_handle_negate_overflow(void *_data, void *old_val);
void __ubsan_handle_divrem_overflow(void *_data, void *lhs, void *rhs);
void __ubsan_handle_type_mismatch(struct type_mismatch_data *data, void *ptr);
void __ubsan_handle_type_mismatch_v1(void *_data, void *ptr);
void __ubsan_handle_out_of_bounds(void *_data, void *index);
void __ubsan_handle_shift_out_of_bounds(void *_data, void *lhs, void *rhs);
void __ubsan_handle_builtin_unreachable(void *_data);
void __ubsan_handle_load_invalid_value(void *_data, void *val);
void __ubsan_handle_alignment_assumption(void *_data, unsigned long ptr,
unsigned long align,
unsigned long offset);
/*
* When generating Runtime Calls, Clang doesn't respect the -mregparm=3
* option used on i386: https://github.com/llvm/llvm-project/issues/89670
* Fix this for earlier Clang versions by forcing the calling convention
* to use non-register arguments.
*/
#if defined(CONFIG_X86_32) && \
defined(CONFIG_CC_IS_CLANG) && CONFIG_CLANG_VERSION < 190000
# define ubsan_linkage asmlinkage
#else
# define ubsan_linkage
#endif
void ubsan_linkage __ubsan_handle_add_overflow(void *data, void *lhs, void *rhs);
void ubsan_linkage __ubsan_handle_sub_overflow(void *data, void *lhs, void *rhs);
void ubsan_linkage __ubsan_handle_mul_overflow(void *data, void *lhs, void *rhs);
void ubsan_linkage __ubsan_handle_negate_overflow(void *_data, void *old_val);
void ubsan_linkage __ubsan_handle_divrem_overflow(void *_data, void *lhs, void *rhs);
void ubsan_linkage __ubsan_handle_type_mismatch(struct type_mismatch_data *data, void *ptr);
void ubsan_linkage __ubsan_handle_type_mismatch_v1(void *_data, void *ptr);
void ubsan_linkage __ubsan_handle_out_of_bounds(void *_data, void *index);
void ubsan_linkage __ubsan_handle_shift_out_of_bounds(void *_data, void *lhs, void *rhs);
void ubsan_linkage __ubsan_handle_builtin_unreachable(void *_data);
void ubsan_linkage __ubsan_handle_load_invalid_value(void *_data, void *val);
void ubsan_linkage __ubsan_handle_alignment_assumption(void *_data, unsigned long ptr,
unsigned long align,
unsigned long offset);
#endif