| 1 | // RUN: %clangxx_asan -std=c++11 -O0 %s -o %t |
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| 2 | // RUN: not %run %t 2>&1 | FileCheck %s --check-prefix=READ |
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| 3 | // RUN: not %run %t write 2>&1 | FileCheck %s --check-prefix=WRITE |
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| 4 | // UNSUPPORTED: target={{(powerpc64|mips|s390).*}} |
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| 5 | |
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| 6 | #include <sys/mman.h> |
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| 7 | |
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| 8 | static volatile int sink; |
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| 9 | __attribute__((noinline)) void Read(int *ptr) { sink = *ptr; } |
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| 10 | __attribute__((noinline)) void Write(int *ptr) { *ptr = 0; } |
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| 11 | int main(int argc, char **argv) { |
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| 12 | // Writes to shadow are detected as reads from shadow gap (because of how the |
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| 13 | // shadow mapping works). This is kinda hard to fix. Test a random address in |
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| 14 | // the application part of the address space. |
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| 15 | void *volatile p = |
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| 16 | mmap(addr: nullptr, len: 4096, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, fd: 0, offset: 0); |
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| 17 | munmap(addr: p, len: 4096); |
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| 18 | if (argc == 1) |
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| 19 | Read(ptr: (int *)p); |
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| 20 | else |
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| 21 | Write(ptr: (int *)p); |
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| 22 | } |
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| 23 | // READ: AddressSanitizer: SEGV on unknown address |
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| 24 | // READ: The signal is caused by a READ memory access. |
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| 25 | // WRITE: AddressSanitizer: SEGV on unknown address |
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| 26 | // WRITE: The signal is caused by a WRITE memory access. |
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| 27 | |
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