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s390/kasan: fix strncpy_from_user kasan checks 

arch/s390/lib/uaccess.c is built without kasan instrumentation. Kasan
checks are performed explicitly in copy_from_user/copy_to_user
functions. But since those functions could be inlined, calls from
files like uaccess.c with instrumentation disabled won't generate
kasan reports. This is currently the case with strncpy_from_user
function which was revealed by newly added kasan test. Avoid inlining of
copy_from_user/copy_to_user when the kernel is built with kasan support
to make sure kasan checks are fully functional.

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
hifive-unleashed-5.2
Vasily Gorbik 2019-04-23 15:36:36 +02:00 committed by Martin Schwidefsky
parent 1c410fd6a5
commit 01eb42afb4
1 changed files with 2 additions and 0 deletions
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arch/s390/include/asm/uaccess.h
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@ -55,8 +55,10 @@ raw_copy_from_user(void *to, const void __user *from, unsigned long n);
unsigned long __must_check
raw_copy_to_user(void __user *to, const void *from, unsigned long n);
#ifndef CONFIG_KASAN
#define INLINE_COPY_FROM_USER
#define INLINE_COPY_TO_USER
#endif
#ifdef CONFIG_HAVE_MARCH_Z10_FEATURES