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s390/stacktrace: Skip first user stack frame

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When walking user stack frames the first stack frame (where the stack
pointer points to) should be skipped: the return address of the current
function is saved in the previous stack frame, not the current stack frame,
which is allocated for to be called functions.

Fixes: aa44433ac4 ("s390: add USER_STACKTRACE support")
Reviewed-by: Jens Remus <jremus@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 2024-04-29 14:28:45 +02:00 committed by Alexander Gordeev
parent ebd912ff99
commit 87eceb17a9
1 changed files with 4 additions and 4 deletions
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8
arch/s390/kernel/stacktrace.c
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@ -95,6 +95,10 @@ void arch_stack_walk_user_common(stack_trace_consume_fn consume_entry, void *coo
while (1) {
if (__get_user(sp, &sf->back_chain))
break;
/* Sanity check: ABI requires SP to be 8 byte aligned. */
if (!sp || sp & 0x7)
break;
sf = (void __user *)sp;
if (__get_user(ip, &sf->gprs[8]))
break;
if (ip & 0x1) {
@ -110,10 +114,6 @@ void arch_stack_walk_user_common(stack_trace_consume_fn consume_entry, void *coo
}
if (!store_ip(consume_entry, cookie, entry, perf, ip))
return;
/* Sanity check: ABI requires SP to be aligned 8 bytes. */
if (!sp || sp & 0x7)
break;
sf = (void __user *)sp;
first = false;
}
pagefault_enable();