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Zend stack on linux msan warning fix. #16219

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Zend stack on linux msan warning fix. #16219

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9 changes: 9 additions & 0 deletions Zend/zend_call_stack.c
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Original file line number Diff line number Diff line change
Expand Up @@ -77,6 +77,10 @@ typedef int boolean_t;
# include <valgrind/valgrind.h>
#endif

#if __has_feature(memory_sanitizer)
# include <sanitizer/msan_interface.h>
#endif

#ifdef ZEND_CHECK_STACK_LIMIT

/* Called once per process or thread */
Expand Down Expand Up @@ -224,6 +228,11 @@ static bool zend_call_stack_get_linux_proc_maps(zend_call_stack *stack)
}

while (fgets(buffer, sizeof(buffer), f) && sscanf(buffer, "%" SCNxPTR "-%" SCNxPTR, &start, &end) == 2) {
#if __has_feature(memory_sanitizer)
/* Are initialised above */
__msan_unpoison(&start, sizeof(start));
__msan_unpoison(&end, sizeof(end));
#endif
if (start <= addr_on_stack && end >= addr_on_stack) {
found = true;
break;
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