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//===-- asan_linux.cc -----------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of AddressSanitizer, an address sanity checker.
//
// Linux-specific details.
//===----------------------------------------------------------------------===//
#ifdef __linux__
#include "asan_internal.h"
#include <sys/mman.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
extern char _DYNAMIC[];
namespace __asan {
void *AsanDoesNotSupportStaticLinkage() {
// This will fail to link with -static.
return &_DYNAMIC;
}
static void *asan_mmap(void *addr, size_t length, int prot, int flags,
int fd, uint64_t offset) {
# if __WORDSIZE == 64
return (void *)syscall(__NR_mmap, addr, length, prot, flags, fd, offset);
# else
return (void *)syscall(__NR_mmap2, addr, length, prot, flags, fd, offset);
# endif
}
void *AsanMmapSomewhereOrDie(size_t size, const char *mem_type) {
size = RoundUpTo(size, kPageSize);
void *res = asan_mmap(0, size,
PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON, -1, 0);
if (res == (void*)-1) {
OutOfMemoryMessageAndDie(mem_type, size);
}
return res;
}
void *AsanMmapFixedNoReserve(uintptr_t fixed_addr, size_t size) {
return asan_mmap((void*)fixed_addr, size,
PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
0, 0);
}
void *AsanMmapFixedReserve(uintptr_t fixed_addr, size_t size) {
return asan_mmap((void*)fixed_addr, size,
PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON | MAP_FIXED,
0, 0);
}
void *AsanMprotect(uintptr_t fixed_addr, size_t size) {
return asan_mmap((void*)fixed_addr, size,
PROT_NONE,
MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
0, 0);
}
void AsanUnmapOrDie(void *addr, size_t size) {
if (!addr || !size) return;
int res = syscall(__NR_munmap, addr, size);
if (res != 0) {
Report("Failed to unmap\n");
ASAN_DIE;
}
}
ssize_t AsanWrite(int fd, const void *buf, size_t count) {
return (ssize_t)syscall(__NR_write, fd, buf, count);
}
int AsanOpenReadonly(const char* filename) {
return open(filename, O_RDONLY);
}
ssize_t AsanRead(int fd, void *buf, size_t count) {
return (ssize_t)syscall(__NR_read, fd, buf, count);
}
int AsanClose(int fd) {
return close(fd);
}
} // namespace __asan
#endif // __linux__
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