llvm-project/compiler-rt/test/dfsan/mmap_at_init.c

35 lines
994 B
C

// RUN: %clang_dfsan -fno-sanitize=dataflow -DCALLOC -c %s -o %t-calloc.o
// RUN: %clang_dfsan %s %t-calloc.o -o %t
// RUN: %run %t
//
// REQUIRES: x86_64-target-arch
//
// Tests that calling mmap() during during dfsan initialization works.
#include <sanitizer/dfsan_interface.h>
#include <sys/mman.h>
#include <unistd.h>
#ifdef CALLOC
// dfsan_init() installs interceptors via dlysm(), which calls calloc().
// Calling mmap() from here should work even if interceptors haven't been fully
// set up yet.
void *calloc(size_t Num, size_t Size) {
size_t PageSize = getpagesize();
Size = Size * Num;
Size = (Size + PageSize - 1) & ~(PageSize - 1); // Round up to PageSize.
void *Ret = mmap(NULL, Size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
// Use assert may cause link errors that require -Wl,-z,notext.
// Do not know the root cause yet.
if (Ret == MAP_FAILED) exit(-1);
return Ret;
}
#else
int main() { return 0; }
#endif // CALLOC