linux-kernel - [tip: x86/entry] compiler_types.h: Add __no_sanitize

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Message-ID: <159226030412.16989.14934233782447300820.tip-bot2@tip-bot2>
Date:   Mon, 15 Jun 2020 22:31:44 -0000
From:   "tip-bot2 for Marco Elver" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     syzbot+dc1fa714cb070b184db5@...kaller.appspotmail.com,
        Marco Elver <elver@...gle.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        x86 <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [tip: x86/entry] compiler_types.h: Add
 __no_sanitize_{address,undefined} to noinstr

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 <elver@...gle.com>
AuthorDate:    Thu, 04 Jun 2020 07:58:11 +02:00
Committer:     Peter Zijlstra <peterz@...radead.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+dc1fa714cb070b184db5@...kaller.appspotmail.com
Signed-off-by: Marco Elver <elver@...gle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Link: https://lore.kernel.org/lkml/000000000000d2474c05a6c938fe@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__ */