1 | // RUN: %clang_dfsan -fno-sanitize=dataflow -DCALLOC -c %s -o %t-calloc.o |
2 | // RUN: %clang_dfsan %s %t-calloc.o -o %t |
3 | // RUN: %run %t |
4 | // |
5 | // Tests that calling mmap() during during dfsan initialization works. |
6 | |
7 | #include <sanitizer/dfsan_interface.h> |
8 | #include <sys/mman.h> |
9 | #include <unistd.h> |
10 | |
11 | #ifdef CALLOC |
12 | |
13 | extern void exit(int) __attribute__((noreturn)); |
14 | |
15 | // dfsan_init() installs interceptors via dlysm(), which calls calloc(). |
16 | // Calling mmap() from here should work even if interceptors haven't been fully |
17 | // set up yet. |
18 | void *calloc(size_t Num, size_t Size) { |
19 | size_t PageSize = getpagesize(); |
20 | Size = Size * Num; |
21 | Size = (Size + PageSize - 1) & ~(PageSize - 1); // Round up to PageSize. |
22 | void *Ret = mmap(NULL, Size, PROT_READ | PROT_WRITE, |
23 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
24 | // Use assert may cause link errors that require -Wl,-z,notext. |
25 | // Do not know the root cause yet. |
26 | if (Ret == MAP_FAILED) exit(-1); |
27 | return Ret; |
28 | } |
29 | |
30 | #else |
31 | |
32 | int main() { return 0; } |
33 | |
34 | #endif // CALLOC |
35 | |