The patch titled
Subject: compiler.h: fix barrier_data() on clang
has been added to the -mm tree. Its filename is
compilerh-fix-barrier_data-on-clang.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/compilerh-fix-barrier_data-on-clang.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/compilerh-fix-barrier_data-on-clang.patch
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------------------------------------------------------
From: Arvind Sankar <nivedita@xxxxxxxxxxxx>
Subject: compiler.h: fix barrier_data() on clang
Commit 815f0ddb346c ("include/linux/compiler*.h: make compiler-*.h
mutually exclusive") neglected to copy barrier_data() from compiler-gcc.h
into compiler-clang.h. The definition in compiler-gcc.h was really to
work around clang's more aggressive optimization, so this broke
barrier_data() on clang, and consequently memzero_explicit() as well.
For example, this results in at least the memzero_explicit() call in
lib/crypto/sha256.c:sha256_transform() being optimized away by clang.
Fix this by moving the definition of barrier_data() into compiler.h.
Also move the gcc/clang definition of barrier() into compiler.h,
__memory_barrier() is icc-specific (and barrier() is already defined using
it in compiler-intel.h) and doesn't belong in compiler.h.
Link: https://lkml.kernel.org/r/20201014212631.207844-1-nivedita@xxxxxxxxxxxx
Signed-off-by: Arvind Sankar <nivedita@xxxxxxxxxxxx>
Fixes: 815f0ddb346c ("include/linux/compiler*.h: make compiler-*.h mutually exclusive")
Reviewed-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Tested-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/compiler-clang.h | 6 ------
include/linux/compiler-gcc.h | 19 -------------------
include/linux/compiler.h | 18 ++++++++++++++++--
3 files changed, 16 insertions(+), 27 deletions(-)
--- a/include/linux/compiler-clang.h~compilerh-fix-barrier_data-on-clang
+++ a/include/linux/compiler-clang.h
@@ -60,12 +60,6 @@
#define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
#endif
-/* The following are for compatibility with GCC, from compiler-gcc.h,
- * and may be redefined here because they should not be shared with other
- * compilers, like ICC.
- */
-#define barrier() __asm__ __volatile__("" : : : "memory")
-
#if __has_feature(shadow_call_stack)
# define __noscs __attribute__((__no_sanitize__("shadow-call-stack")))
#endif
--- a/include/linux/compiler-gcc.h~compilerh-fix-barrier_data-on-clang
+++ a/include/linux/compiler-gcc.h
@@ -15,25 +15,6 @@
# error Sorry, your version of GCC is too old - please use 4.9 or newer.
#endif
-/* Optimization barrier */
-
-/* The "volatile" is due to gcc bugs */
-#define barrier() __asm__ __volatile__("": : :"memory")
-/*
- * This version is i.e. to prevent dead stores elimination on @ptr
- * where gcc and llvm may behave differently when otherwise using
- * normal barrier(): while gcc behavior gets along with a normal
- * barrier(), llvm needs an explicit input variable to be assumed
- * clobbered. The issue is as follows: while the inline asm might
- * access any memory it wants, the compiler could have fit all of
- * @ptr into memory registers instead, and since @ptr never escaped
- * from that, it proved that the inline asm wasn't touching any of
- * it. This version works well with both compilers, i.e. we're telling
- * the compiler that the inline asm absolutely may see the contents
- * of @ptr. See also: https://llvm.org/bugs/show_bug.cgi?id=15495
- */
-#define barrier_data(ptr) __asm__ __volatile__("": :"r"(ptr) :"memory")
-
/*
* This macro obfuscates arithmetic on a variable address so that gcc
* shouldn't recognize the original var, and make assumptions about it.
--- a/include/linux/compiler.h~compilerh-fix-barrier_data-on-clang
+++ a/include/linux/compiler.h
@@ -80,11 +80,25 @@ void ftrace_likely_update(struct ftrace_
/* Optimization barrier */
#ifndef barrier
-# define barrier() __memory_barrier()
+/* The "volatile" is due to gcc bugs */
+# define barrier() __asm__ __volatile__("": : :"memory")
#endif
#ifndef barrier_data
-# define barrier_data(ptr) barrier()
+/*
+ * This version is i.e. to prevent dead stores elimination on @ptr
+ * where gcc and llvm may behave differently when otherwise using
+ * normal barrier(): while gcc behavior gets along with a normal
+ * barrier(), llvm needs an explicit input variable to be assumed
+ * clobbered. The issue is as follows: while the inline asm might
+ * access any memory it wants, the compiler could have fit all of
+ * @ptr into memory registers instead, and since @ptr never escaped
+ * from that, it proved that the inline asm wasn't touching any of
+ * it. This version works well with both compilers, i.e. we're telling
+ * the compiler that the inline asm absolutely may see the contents
+ * of @ptr. See also: https://llvm.org/bugs/show_bug.cgi?id=15495
+ */
+# define barrier_data(ptr) __asm__ __volatile__("": :"r"(ptr) :"memory")
#endif
/* workaround for GCC PR82365 if needed */
_
Patches currently in -mm which might be from nivedita@xxxxxxxxxxxx are
compilerh-fix-barrier_data-on-clang.patch
