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s390/smp: kasan stack instrumentation support 

smp_start_secondary function is called without DAT enabled. To avoid
disabling kasan instrumentation for entire arch/s390/kernel/smp.c
smp_start_secondary has been split in 2 parts. smp_start_secondary has
instrumentation disabled, it does minimal setup and enables DAT. Then
instrumentated __smp_start_secondary is called to do the rest.

__load_psw_mask function instrumentation has been disabled as well
to be able to call it from smp_start_secondary.

Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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 12:13:52 +01:00 committed by Martin Schwidefsky
parent dde709d136
commit 9e8df6daed
2 changed files with 4 additions and 4 deletions
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2
arch/s390/include/asm/processor.h
View File

@ -336,7 +336,7 @@ 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 inline void __load_psw_mask(unsigned long mask)
static __no_sanitize_address_or_inline void __load_psw_mask(unsigned long mask)
{
unsigned long addr;
psw_t psw;

6
arch/s390/kernel/smp.c
View File

@ -804,6 +804,8 @@ static void smp_init_secondary(void)
{
int cpu = smp_processor_id();
S390_lowcore.last_update_clock = get_tod_clock();
restore_access_regs(S390_lowcore.access_regs_save_area);
cpu_init();
preempt_disable();
init_cpu_timer();
@ -823,14 +825,12 @@ static void smp_init_secondary(void)
/*
* Activate a secondary processor.
*/
static void smp_start_secondary(void *cpuvoid)
static void __no_sanitize_address smp_start_secondary(void *cpuvoid)
{
S390_lowcore.last_update_clock = get_tod_clock();
S390_lowcore.restart_stack = (unsigned long) restart_stack;
S390_lowcore.restart_fn = (unsigned long) do_restart;
S390_lowcore.restart_data = 0;
S390_lowcore.restart_source = -1UL;
restore_access_regs(S390_lowcore.access_regs_save_area);
__ctl_load(S390_lowcore.cregs_save_area, 0, 15);
__load_psw_mask(PSW_KERNEL_BITS | PSW_MASK_DAT);
CALL_ON_STACK(smp_init_secondary, S390_lowcore.kernel_stack, 0);