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s390/kasan: reipl and kexec support

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Some functions from both arch/s390/kernel/ipl.c and
arch/s390/kernel/machine_kexec.c are called without DAT enabled
(or with and without DAT enabled code paths). There is no easy way
to partially disable kasan for those files without a substantial
rework. Disable kasan for both files for now.

To avoid disabling kasan for arch/s390/kernel/diag.c DAT flag is
enabled in diag308 call. pcpu_delegate which disables DAT is marked
with __no_sanitize_address to disable instrumentation for that one
function.

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Vasily Gorbik 2017-11-20 12:15:10 +01:00 committed by Martin Schwidefsky
parent 9e8df6daed
commit ac1256f826
4 changed files with 8 additions and 3 deletions
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2
arch/s390/include/asm/processor.h
View File

@ -242,7 +242,7 @@ static inline unsigned long current_stack_pointer(void)
return sp;
}
static inline unsigned short stap(void)
static __no_sanitize_address_or_inline unsigned short stap(void)
{
unsigned short cpu_address;

2
arch/s390/kernel/Makefile
View File

@ -24,6 +24,8 @@ UBSAN_SANITIZE_early.o := n
UBSAN_SANITIZE_early_nobss.o := n
KASAN_SANITIZE_early_nobss.o := n
KASAN_SANITIZE_ipl.o := n
KASAN_SANITIZE_machine_kexec.o := n
#
# Passing null pointers is ok for smp code, since we access the lowcore here.

2
arch/s390/kernel/ipl.c
View File

@ -156,6 +156,8 @@ static inline int __diag308(unsigned long subcode, void *addr)
int diag308(unsigned long subcode, void *addr)
{
if (IS_ENABLED(CONFIG_KASAN))
__arch_local_irq_stosm(0x04); /* enable DAT */
diag_stat_inc(DIAG_STAT_X308);
return __diag308(subcode, addr);
}

5
arch/s390/kernel/smp.c
View File

@ -313,8 +313,9 @@ static void __pcpu_delegate(void (*func)(void*), void *data)
func(data); /* should not return */
}
static void pcpu_delegate(struct pcpu *pcpu, void (*func)(void *),
void *data, unsigned long stack)
static void __no_sanitize_address pcpu_delegate(struct pcpu *pcpu,
void (*func)(void *),
void *data, unsigned long stack)
{
struct lowcore *lc = lowcore_ptr[pcpu - pcpu_devices];
unsigned long source_cpu = stap();