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[ Upstream commit7424fc6b86] Currently ARM64 extracts which specific sanitizer has caused a trap via encoded data in the trap instruction. Clang on x86 currently encodes the same data in the UD1 instruction but x86 handle_bug() and is_valid_bugaddr() currently only look at UD2. Bring x86 to parity with ARM64, similar to commit25b84002af("arm64: Support Clang UBSAN trap codes for better reporting"). See the llvm links for information about the code generation. Enable the reporting of UBSAN sanitizer details on x86 compiled with clang when CONFIG_UBSAN_TRAP=y by analysing UD1 and retrieving the type immediate which is encoded by the compiler after the UD1. [ tglx: Simplified it by moving the printk() into handle_bug() ] Signed-off-by: Gatlin Newhouse <gatlin.newhouse@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/all/20240724000206.451425-1-gatlin.newhouse@gmail.com Link: https://github.com/llvm/llvm-project/commit/c5978f42ec8e9#diff-bb68d7cd885f41cfc35843998b0f9f534adb60b415f647109e597ce448e92d9f Link: https://github.com/llvm/llvm-project/blob/main/llvm/lib/Target/X86/X86InstrSystem.td#L27 Stable-dep-of:1db272864f("x86/traps: move kmsan check after instrumentation_begin") Signed-off-by: Sasha Levin <sashal@kernel.org>
15 lines
307 B
C
15 lines
307 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_UBSAN_H
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#define _LINUX_UBSAN_H
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#ifdef CONFIG_UBSAN_TRAP
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const char *report_ubsan_failure(struct pt_regs *regs, u32 check_type);
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#else
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static inline const char *report_ubsan_failure(struct pt_regs *regs, u32 check_type)
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{
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return NULL;
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}
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#endif
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#endif
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