s390/stacktrace: Skip first user stack frame
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: aa44433ac4ee ("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>
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@ -95,6 +95,10 @@ void arch_stack_walk_user_common(stack_trace_consume_fn consume_entry, void *coo
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while (1) {
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if (__get_user(sp, &sf->back_chain))
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break;
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/* Sanity check: ABI requires SP to be 8 byte aligned. */
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if (!sp || sp & 0x7)
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break;
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sf = (void __user *)sp;
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if (__get_user(ip, &sf->gprs[8]))
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break;
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if (ip & 0x1) {
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@ -110,10 +114,6 @@ void arch_stack_walk_user_common(stack_trace_consume_fn consume_entry, void *coo
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}
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if (!store_ip(consume_entry, cookie, entry, perf, ip))
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return;
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/* Sanity check: ABI requires SP to be aligned 8 bytes. */
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if (!sp || sp & 0x7)
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break;
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sf = (void __user *)sp;
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first = false;
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}
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pagefault_enable();
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