52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
// Verify that use of longjmp() in a _FORTIFY_SOURCE'd library (without ASAN)
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// is correctly intercepted such that the stack is unpoisoned.
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// Note: it is essential that the external library is not built with ASAN,
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// otherwise it would be able to unpoison the stack before use.
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//
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// RUN: %clang -DIS_LIBRARY -D_FORTIFY_SOURCE=2 -O2 %s -c -o %t.o
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// RUN: %clang_asan -O2 %s %t.o -o %t
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// RUN: %run %t
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#ifdef IS_LIBRARY
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/* the library */
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#include <setjmp.h>
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#include <assert.h>
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#include <sanitizer/asan_interface.h>
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static jmp_buf jenv;
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void external_callme(void (*callback)(void)) {
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if (setjmp(jenv) == 0) {
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callback();
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}
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}
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void external_longjmp(char *msg) {
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longjmp(jenv, 1);
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}
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void external_check_stack(void) {
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char buf[256] = "";
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for (int i = 0; i < 256; i++) {
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assert(!__asan_address_is_poisoned(buf + i));
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}
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}
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#else
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/* main program */
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extern void external_callme(void (*callback)(void));
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extern void external_longjmp(char *msg);
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extern void external_check_stack(void);
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static void callback(void) {
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char msg[16]; /* Note: this triggers addition of a redzone. */
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/* Note: msg is passed to prevent compiler optimization from removing it. */
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external_longjmp(msg);
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}
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int main() {
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external_callme(callback);
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external_check_stack();
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return 0;
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}
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#endif
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