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1// REQUIRES: target={{x86_64-.*}}2// RUN: %clang_dfsan -gmlt -mllvm -dfsan-track-origins=1 %s -o %t && \3// RUN: %run %t >%t.out 2>&14// RUN: FileCheck %s < %t.out5 6#include <sanitizer/dfsan_interface.h>7 8int main(int argc, char *argv[]) {9 uint64_t a = 10;10 dfsan_set_label(1, &a, sizeof(a));11 12 // Manually compute origin address for &a.13 // See x86 MEM_TO_ORIGIN macro for logic to replicate here.14 // Alignment is also needed after to MEM_TO_ORIGIN.15 uint64_t origin_addr =16 (((uint64_t)&a ^ 0x500000000000ULL) + 0x100000000000ULL) & ~0x3ULL;17 18 // Take the address we computed, and store 0 in it to mess it up.19 asm("mov %0, %%rax": :"r"(origin_addr));20 asm("movq $0, (%rax)");21 dfsan_print_origin_trace(&a, "invalid");22}23 24// CHECK: Taint value 0x1 (at {{.*}}) origin tracking (invalid)25// CHECK: Taint value 0x1 (at {{.*}}) has invalid origin tracking. This can be a DFSan bug.26