From: Kees Cook <keescook@chromium.org>
To: Marco Elver <elver@google.com>
Cc: Kees Cook <keescook@chromium.org>,
Andrey Konovalov <andreyknvl@gmail.com>,
Andrey Ryabinin <ryabinin.a.a@gmail.com>,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Bill Wendling <morbo@google.com>,
Justin Stitt <justinstitt@google.com>,
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 [thread overview]
Message-ID: <20240424162942.work.341-kees@kernel.org> (raw)
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: ernsteiswuerfel
Closes: https://github.com/KSPP/linux/issues/350
Signed-off-by: Kees Cook <keescook@chromium.org>
---
Cc: Marco Elver <elver@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Bill Wendling <morbo@google.com>
Cc: Justin Stitt <justinstitt@google.com>
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
-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. 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_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
--
2.34.1
next reply other threads:[~2024-04-24 16:29 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-24 16:29 Kees Cook [this message]
2024-04-24 19:26 ` [PATCH] ubsan: Avoid i386 UBSAN handler crashes with Clang Nathan Chancellor
2024-04-24 22:32 ` Kees Cook
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