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s390/checksum: support GENERIC_CSUM, enable it for KASAN

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This is the s390 variant of commit d911c67e10 ("x86: kasan: kmsan:
support CONFIG_GENERIC_CSUM on x86, enable it for KASAN/KMSAN"). Even
though most of the s390 specific checksum code is written in C there is
still the csum_partial() inline assembly which could prevent KASAN and
KMSAN from seeing all memory accesses.

Therefore switch to GENERIC_CSUM if KASAN is enabled just like x86.

Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2022-11-30 10:40:34 +01:00 committed by Alexander Gordeev
parent 78c045c08a
commit dfe843dce7
2 changed files with 11 additions and 0 deletions
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4
arch/s390/Kconfig
View file

@ -26,6 +26,10 @@ config GENERIC_BUG
config GENERIC_BUG_RELATIVE_POINTERS
def_bool y
config GENERIC_CSUM
bool
default y if KASAN
config GENERIC_LOCKBREAK
def_bool y if PREEMPTION

7
arch/s390/include/asm/checksum.h
View file

@ -12,6 +12,12 @@
#ifndef _S390_CHECKSUM_H
#define _S390_CHECKSUM_H
#ifdef CONFIG_GENERIC_CSUM
#include <asm-generic/checksum.h>
#else /* CONFIG_GENERIC_CSUM */
#include <linux/uaccess.h>
#include <linux/in6.h>
@ -129,4 +135,5 @@ static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
return csum_fold((__force __wsum)(sum >> 32));
}
#endif /* CONFIG_GENERIC_CSUM */
#endif /* _S390_CHECKSUM_H */