| 1 | // RUN: %clang_dfsan -fno-sanitize=dataflow -DCALLOC -c %s -o %t-calloc.o |
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| 2 | // RUN: %clang_dfsan %s %t-calloc.o -o %t |
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| 3 | // RUN: %run %t |
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| 4 | // |
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| 5 | // Tests that calling mmap() during during dfsan initialization works. |
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| 6 | |
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| 7 | // `internal_symbolizer` can not use `realloc` on memory from the test `calloc`. |
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| 8 | // UNSUPPORTED: internal_symbolizer |
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| 9 | |
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| 10 | #include <sanitizer/dfsan_interface.h> |
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| 11 | #include <sys/mman.h> |
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| 12 | #include <unistd.h> |
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| 13 | |
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| 14 | #ifdef CALLOC |
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| 15 | |
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| 16 | extern void exit(int) __attribute__((noreturn)); |
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| 17 | |
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| 18 | // dfsan_init() installs interceptors via dlysm(), which calls calloc(). |
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| 19 | // Calling mmap() from here should work even if interceptors haven't been fully |
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| 20 | // set up yet. |
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| 21 | void *calloc(size_t Num, size_t Size) { |
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| 22 | size_t PageSize = getpagesize(); |
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| 23 | Size = Size * Num; |
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| 24 | Size = (Size + PageSize - 1) & ~(PageSize - 1); // Round up to PageSize. |
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| 25 | void *Ret = mmap(NULL, Size, PROT_READ | PROT_WRITE, |
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| 26 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
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| 27 | // Use assert may cause link errors that require -Wl,-z,notext. |
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| 28 | // Do not know the root cause yet. |
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| 29 | if (Ret == MAP_FAILED) exit(-1); |
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| 30 | return Ret; |
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| 31 | } |
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| 32 | |
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| 33 | #else |
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| 34 | |
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| 35 | int main() { return 0; } |
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| 36 | |
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| 37 | #endif // CALLOC |
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| 38 | |
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