| 1 | // REQUIRES: target={{x86_64-.*}} |
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| 2 | // RUN: %clang_dfsan -gmlt -mllvm -dfsan-track-origins=1 %s -o %t && \ |
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| 3 | // RUN: %run %t >%t.out 2>&1 |
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| 4 | // RUN: FileCheck %s < %t.out |
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| 5 | |
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| 6 | #include <sanitizer/dfsan_interface.h> |
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| 7 | |
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| 8 | int main(int argc, char *argv[]) { |
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| 9 | uint64_t a = 10; |
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| 10 | dfsan_set_label(label: 1, addr: &a, size: sizeof(a)); |
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| 11 | |
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| 12 | // Manually compute origin address for &a. |
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| 13 | // See x86 MEM_TO_ORIGIN macro for logic to replicate here. |
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| 14 | // Alignment is also needed after to MEM_TO_ORIGIN. |
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| 15 | uint64_t origin_addr = |
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| 16 | (((uint64_t)&a ^ 0x500000000000ULL) + 0x100000000000ULL) & ~0x3ULL; |
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| 17 | |
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| 18 | // Take the address we computed, and store 0 in it to mess it up. |
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| 19 | asm("mov %0, %%rax" : :"r" (origin_addr)); |
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| 20 | asm("movq $0, (%rax)" ); |
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| 21 | dfsan_print_origin_trace(addr: &a, description: "invalid" ); |
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| 22 | } |
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| 23 | |
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| 24 | // CHECK: Taint value 0x1 (at {{.*}}) origin tracking (invalid) |
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| 25 | // CHECK: Taint value 0x1 (at {{.*}}) has invalid origin tracking. This can be a DFSan bug. |
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| 26 | |
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