The following commit has been merged into the x86/entry branch of tip:
Commit-ID: 5144f8a8dfd7b3681f0a2b5bf599a210b2315018
Gitweb:
https://git.kernel.org/tip/5144f8a8dfd7b3681f0a2b5bf599a210b2315018
Author: Marco Elver <el...@google.com>
AuthorDate: Thu, 04 Jun 2020 07:58:11 +02:00
Committer: Peter Zijlstra <pet...@infradead.org>
CommitterDate: Mon, 15 Jun 2020 14:10:09 +02:00
compiler_types.h: Add __no_sanitize_{address,undefined} to noinstr
Adds the portable definitions for __no_sanitize_address, and
__no_sanitize_undefined, and subsequently changes noinstr to use the
attributes to disable instrumentation via KASAN or UBSAN.
Reported-by: syzbot+dc1fa714cb070b184...@syzkaller.appspotmail.com
Signed-off-by: Marco Elver <el...@google.com>
Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org>
Acked-by: Miguel Ojeda <miguel.ojeda.sando...@gmail.com>
Link: https://lore.kernel.org/lkml/000000000000d2474c05a6c93...@google.com/
---
include/linux/compiler-clang.h | 8 ++++++++
include/linux/compiler-gcc.h | 6 ++++++
include/linux/compiler_types.h | 3 ++-
3 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/include/linux/compiler-clang.h b/include/linux/compiler-clang.h
index ee37256..5e55302 100644
--- a/include/linux/compiler-clang.h
+++ b/include/linux/compiler-clang.h
@@ -33,6 +33,14 @@
#define __no_sanitize_thread
#endif
+#if __has_feature(undefined_behavior_sanitizer)
+/* GCC does not have __SANITIZE_UNDEFINED__ */
+#define __no_sanitize_undefined \
+ __attribute__((no_sanitize("undefined")))
+#else
+#define __no_sanitize_undefined
+#endif
+
/*
* Not all versions of clang implement the the type-generic versions
* of the builtin overflow checkers. Fortunately, clang implements
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index 7dd4e03..1c74464 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -150,6 +150,12 @@
#define __no_sanitize_thread
#endif
+#if __has_attribute(__no_sanitize_undefined__)
+#define __no_sanitize_undefined __attribute__((no_sanitize_undefined))
+#else
+#define __no_sanitize_undefined
+#endif
+
#if GCC_VERSION >= 50100
#define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
#endif
diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h
index a8b4266..85b8d23 100644
--- a/include/linux/compiler_types.h
+++ b/include/linux/compiler_types.h
@@ -198,7 +198,8 @@ struct ftrace_likely_data {
/* Section for code which can't be instrumented at all */
#define noinstr
\
- noinline notrace __attribute((__section__(".noinstr.text"))) __no_kcsan
+ noinline notrace __attribute((__section__(".noinstr.text"))) \
+ __no_kcsan __no_sanitize_address __no_sanitize_undefined
#endif /* __KERNEL__ */
