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Wed, 24 Apr 2024 09:29:45 -0700 (PDT) Received: from www.outflux.net ([198.0.35.241]) by smtp.gmail.com with ESMTPSA id e5-20020a17090a4a0500b002a269828bb8sm11388846pjh.40.2024.04.24.09.29.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 24 Apr 2024 09:29:44 -0700 (PDT) From: Kees Cook To: Marco Elver Cc: Kees Cook , Andrey Konovalov , Andrey Ryabinin , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , llvm@lists.linux.dev, kasan-dev@googlegroups.com, linux-hardening@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] ubsan: Avoid i386 UBSAN handler crashes with Clang Date: Wed, 24 Apr 2024 09:29:43 -0700 Message-Id: <20240424162942.work.341-kees@kernel.org> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3634; i=keescook@chromium.org; h=from:subject:message-id; bh=8+7ximJNE3huew93u7w7rKw7nI9gr+b5vuxXFU9vyvI=; 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charset="utf-8" When generating Runtime Calls, Clang doesn't respect the -mregparm=3D3 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: ernsteiswuerfel Closes: https://github.com/KSPP/linux/issues/350 Signed-off-by: Kees Cook --- Cc: Marco Elver Cc: Andrey Konovalov Cc: Andrey Ryabinin Cc: Nathan Chancellor Cc: Nick Desaulniers Cc: Bill Wendling Cc: Justin Stitt Cc: llvm@lists.linux.dev Cc: kasan-dev@googlegroups.com Cc: linux-hardening@vger.kernel.org --- lib/ubsan.h | 41 +++++++++++++++++++++++++++-------------- 1 file changed, 27 insertions(+), 14 deletions(-) diff --git a/lib/ubsan.h b/lib/ubsan.h index 50ef50811b7c..978828f6099d 100644 --- a/lib/ubsan.h +++ b/lib/ubsan.h @@ -124,19 +124,32 @@ typedef s64 s_max; typedef u64 u_max; #endif =20 -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 *p= tr); -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=3D3 + * 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. + */ +#if defined(__clang__) && defined(CONFIG_X86_32) +# 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_v= al); +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 *l= hs, void *rhs); +void ubsan_linkage __ubsan_handle_builtin_unreachable(void *_data); +void ubsan_linkage __ubsan_handle_load_invalid_value(void *_data, void *va= l); +void ubsan_linkage __ubsan_handle_alignment_assumption(void *_data, unsign= ed long ptr, + unsigned long align, + unsigned long offset); =20 #endif --=20 2.34.1