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372c275800
After #87191 we had to add 8b135a7d1f59a5a7adccb162abf92d751209afe7, which makes symbolizer to calls a global constructor with `realloc`.
38 lines
1.1 KiB
C
38 lines
1.1 KiB
C
// RUN: %clang_dfsan -fno-sanitize=dataflow -DCALLOC -c %s -o %t-calloc.o
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// RUN: %clang_dfsan %s %t-calloc.o -o %t
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// RUN: %run %t
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//
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// Tests that calling mmap() during during dfsan initialization works.
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// `internal_symbolizer` can not use `realloc` on memory from the test `calloc`.
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// UNSUPPORTED: internal_symbolizer
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#include <sanitizer/dfsan_interface.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#ifdef CALLOC
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extern void exit(int) __attribute__((noreturn));
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// dfsan_init() installs interceptors via dlysm(), which calls calloc().
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// Calling mmap() from here should work even if interceptors haven't been fully
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// set up yet.
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void *calloc(size_t Num, size_t Size) {
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size_t PageSize = getpagesize();
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Size = Size * Num;
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Size = (Size + PageSize - 1) & ~(PageSize - 1); // Round up to PageSize.
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void *Ret = mmap(NULL, Size, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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// Use assert may cause link errors that require -Wl,-z,notext.
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// Do not know the root cause yet.
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if (Ret == MAP_FAILED) exit(-1);
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return Ret;
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}
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#else
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int main() { return 0; }
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#endif // CALLOC
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