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44 lines
1.4 KiB
44 lines
1.4 KiB
4 months ago
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// Test that out-of-scope local variables are ignored by LSan.
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// RUN: LSAN_BASE="report_objects=1:use_registers=0:use_stacks=1"
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// RUN: %clangxx_lsan %s -o %t
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// RUN: LSAN_OPTIONS=$LSAN_BASE not %run %t 2>&1 | FileCheck %s
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// RUN: LSAN_OPTIONS=$LSAN_BASE":exitcode=0" %run %t 2>&1 | FileCheck --check-prefix=CHECK-sanity %s
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#include <stdio.h>
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#include <stdlib.h>
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void **pp;
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// Put pointer far enough on the stack that LSan has space to run in without
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// overwriting it.
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// Hopefully the argument p will be passed on a register, saving us from false
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// negatives.
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__attribute__((noinline))
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void *PutPointerOnStaleStack(void *p) {
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void *locals[2048];
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locals[0] = p;
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pp = &locals[0];
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fprintf(stderr, "Test alloc: %p.\n", locals[0]);
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return 0;
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}
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int main() {
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PutPointerOnStaleStack(malloc(1337));
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return 0;
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}
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// This must run after LSan, to ensure LSan didn't overwrite the pointer before
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// it had a chance to see it. If LSan is invoked with atexit(), this works.
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// Otherwise, we need a different method.
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__attribute__((destructor))
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__attribute__((no_sanitize_address))
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void ConfirmPointerHasSurvived() {
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fprintf(stderr, "Value after LSan: %p.\n", *pp);
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}
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// CHECK: Test alloc: [[ADDR:.*]].
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// CHECK-sanity: Test alloc: [[ADDR:.*]].
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// CHECK: LeakSanitizer: detected memory leaks
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// CHECK: [[ADDR]] (1337 bytes)
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// CHECK: SUMMARY: {{(Leak|Address)}}Sanitizer:
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// CHECK-sanity: Value after LSan: [[ADDR]].
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