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compiler: remove __no_sanitize_address_or_inline again 

The __no_sanitize_address_or_inline and __no_kasan_or_inline defines
are almost identical. The only difference is that __no_kasan_or_inline
does not have the 'notrace' attribute.

To be able to replace __no_sanitize_address_or_inline with the older
definition, add 'notrace' to __no_kasan_or_inline and change to two
users of __no_sanitize_address_or_inline in the s390 code.

The 'notrace' option is necessary for e.g. the __load_psw_mask function
in arch/s390/include/asm/processor.h. Without the option it is possible
to trace __load_psw_mask which leads to kernel stack overflow.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Pointed-out-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Martin Schwidefsky 2018-11-05 07:36:28 +01:00 committed by Linus Torvalds
parent 651022382c
commit 163c8d54a9
3 changed files with 3 additions and 15 deletions
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4
arch/s390/include/asm/processor.h
View File

@ -236,7 +236,7 @@ static inline unsigned long current_stack_pointer(void)
return sp;
}
static __no_sanitize_address_or_inline unsigned short stap(void)
static __no_kasan_or_inline unsigned short stap(void)
{
unsigned short cpu_address;
@ -330,7 +330,7 @@ static inline void __load_psw(psw_t psw)
* Set PSW mask to specified value, while leaving the
* PSW addr pointing to the next instruction.
*/
static __no_sanitize_address_or_inline void __load_psw_mask(unsigned long mask)
static __no_kasan_or_inline void __load_psw_mask(unsigned long mask)
{
unsigned long addr;
psw_t psw;

12
include/linux/compiler-gcc.h
View File

@ -143,18 +143,6 @@
#define KASAN_ABI_VERSION 3
#endif
/*
* Because __no_sanitize_address conflicts with inlining:
* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67368
* we do one or the other.
*/
#ifdef CONFIG_KASAN
#define __no_sanitize_address_or_inline \
__no_sanitize_address __maybe_unused notrace
#else
#define __no_sanitize_address_or_inline inline
#endif
#if GCC_VERSION >= 50100
#define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
#endif

2
include/linux/compiler.h
View File

@ -189,7 +189,7 @@ void __read_once_size(const volatile void *p, void *res, int size)
* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67368
* '__maybe_unused' allows us to avoid defined-but-not-used warnings.
*/
# define __no_kasan_or_inline __no_sanitize_address __maybe_unused
# define __no_kasan_or_inline __no_sanitize_address notrace __maybe_unused
#else
# define __no_kasan_or_inline __always_inline
#endif