forked from OSchip/llvm-project
55 lines
1.2 KiB
C
55 lines
1.2 KiB
C
// RUN: %clang_safestack %s -pthread -o %t
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// RUN: %run %t 0
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// RUN: not --crash %run %t 1
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// Test unsafe stack deallocation. Unsafe stacks are not deallocated immediately
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// at thread exit. They are deallocated by following exiting threads.
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#include <stdlib.h>
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#include <string.h>
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#include <pthread.h>
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enum { kBufferSize = (1 << 15) };
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void *start(void *ptr)
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{
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char buffer[kBufferSize];
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return buffer;
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}
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int main(int argc, char **argv)
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{
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int arg = atoi(argv[1]);
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pthread_t t1, t2;
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char *t1_buffer = NULL;
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if (pthread_create(&t1, NULL, start, NULL))
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abort();
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if (pthread_join(t1, &t1_buffer))
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abort();
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// Stack has not yet been deallocated
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memset(t1_buffer, 0, kBufferSize);
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if (arg == 0)
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return 0;
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for (int i = 0; i < 3; i++) {
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if (pthread_create(&t2, NULL, start, NULL))
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abort();
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// Second thread destructor cleans up the first thread's stack.
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if (pthread_join(t2, NULL))
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abort();
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// Should segfault here
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memset(t1_buffer, 0, kBufferSize);
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// PR39001: Re-try in the rare case that pthread_join() returns before the
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// thread finishes exiting in the kernel--hence the tgkill() check for t1
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// returns that it's alive despite pthread_join() returning.
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sleep(1);
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}
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return 0;
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}
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