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//===-- sanitizer_posix.cc ------------------------------------------------===//
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is shared between AddressSanitizer and ThreadSanitizer
// run-time libraries and implements POSIX-specific functions from
// sanitizer_libc.h.
//===----------------------------------------------------------------------===//
#if defined(__linux__) || defined(__APPLE__)
#include "sanitizer_common.h"
#include "sanitizer_libc.h"
#include "sanitizer_procmaps.h"
#include <errno.h>
#include <pthread.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/resource.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
namespace __sanitizer {
// ------------- sanitizer_common.h
uptr GetPageSize() {
return sysconf(_SC_PAGESIZE);
}
uptr GetMmapGranularity() {
return GetPageSize();
}
int GetPid() {
return getpid();
}
u32 GetUid() {
return getuid();
}
uptr GetThreadSelf() {
return (uptr)pthread_self();
}
void *MmapOrDie(uptr size, const char *mem_type) {
size = RoundUpTo(size, GetPageSizeCached());
void *res = internal_mmap(0, size,
PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON, -1, 0);
if (res == (void*)-1) {
static int recursion_count;
if (recursion_count) {
// The Report() and CHECK calls below may call mmap recursively and fail.
// If we went into recursion, just die.
RawWrite("ERROR: Failed to mmap\n");
Die();
}
recursion_count++;
Report("ERROR: %s failed to allocate 0x%zx (%zd) bytes of %s: %s\n",
SanitizerToolName, size, size, mem_type, strerror(errno));
DumpProcessMap();
CHECK("unable to mmap" && 0);
}
return res;
}
void UnmapOrDie(void *addr, uptr size) {
if (!addr || !size) return;
int res = internal_munmap(addr, size);
if (res != 0) {
Report("ERROR: %s failed to deallocate 0x%zx (%zd) bytes at address %p\n",
SanitizerToolName, size, size, addr);
CHECK("unable to unmap" && 0);
}
}
void *MmapFixedNoReserve(uptr fixed_addr, uptr size) {
uptr PageSize = GetPageSizeCached();
void *p = internal_mmap((void*)(fixed_addr & ~(PageSize - 1)),
RoundUpTo(size, PageSize),
PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
-1, 0);
if (p == (void*)-1)
Report("ERROR: "
"%s failed to allocate 0x%zx (%zd) bytes at address %p (%d)\n",
SanitizerToolName, size, size, fixed_addr, errno);
return p;
}
void *MmapFixedOrDie(uptr fixed_addr, uptr size) {
uptr PageSize = GetPageSizeCached();
void *p = internal_mmap((void*)(fixed_addr & ~(PageSize - 1)),
RoundUpTo(size, PageSize),
PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON | MAP_FIXED,
-1, 0);
if (p == (void*)-1) {
Report("ERROR:"
" %s failed to allocate 0x%zx (%zd) bytes at address %p (%d)\n",
SanitizerToolName, size, size, fixed_addr, errno);
CHECK("unable to mmap" && 0);
}
return p;
}
void *Mprotect(uptr fixed_addr, uptr size) {
return internal_mmap((void*)fixed_addr, size,
PROT_NONE,
MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
-1, 0);
}
void FlushUnneededShadowMemory(uptr addr, uptr size) {
madvise((void*)addr, size, MADV_DONTNEED);
}
void *MapFileToMemory(const char *file_name, uptr *buff_size) {
fd_t fd = OpenFile(file_name, false);
CHECK_NE(fd, kInvalidFd);
uptr fsize = internal_filesize(fd);
CHECK_NE(fsize, (uptr)-1);
CHECK_GT(fsize, 0);
*buff_size = RoundUpTo(fsize, GetPageSizeCached());
void *map = internal_mmap(0, *buff_size, PROT_READ, MAP_PRIVATE, fd, 0);
return (map == MAP_FAILED) ? 0 : map;
}
static inline bool IntervalsAreSeparate(uptr start1, uptr end1,
uptr start2, uptr end2) {
CHECK(start1 <= end1);
CHECK(start2 <= end2);
return (end1 < start2) || (end2 < start1);
}
// FIXME: this is thread-unsafe, but should not cause problems most of the time.
// When the shadow is mapped only a single thread usually exists (plus maybe
// several worker threads on Mac, which aren't expected to map big chunks of
// memory).
bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
MemoryMappingLayout procmaps;
uptr start, end;
while (procmaps.Next(&start, &end,
/*offset*/0, /*filename*/0, /*filename_size*/0)) {
if (!IntervalsAreSeparate(start, end, range_start, range_end))
return false;
}
return true;
}
void DumpProcessMap() {
MemoryMappingLayout proc_maps;
uptr start, end;
const sptr kBufSize = 4095;
char *filename = (char*)MmapOrDie(kBufSize, __FUNCTION__);
Report("Process memory map follows:\n");
while (proc_maps.Next(&start, &end, /* file_offset */0,
filename, kBufSize)) {
Printf("\t%p-%p\t%s\n", (void*)start, (void*)end, filename);
}
Report("End of process memory map.\n");
UnmapOrDie(filename, kBufSize);
}
const char *GetPwd() {
return GetEnv("PWD");
}
void DisableCoreDumper() {
struct rlimit nocore;
nocore.rlim_cur = 0;
nocore.rlim_max = 0;
setrlimit(RLIMIT_CORE, &nocore);
}
bool StackSizeIsUnlimited() {
struct rlimit rlim;
CHECK_EQ(0, getrlimit(RLIMIT_STACK, &rlim));
return (rlim.rlim_cur == (uptr)-1);
}
void SetStackSizeLimitInBytes(uptr limit) {
struct rlimit rlim;
rlim.rlim_cur = limit;
rlim.rlim_max = limit;
if (setrlimit(RLIMIT_STACK, &rlim)) {
Report("ERROR: %s setrlimit() failed %d\n", SanitizerToolName, errno);
Die();
}
CHECK(!StackSizeIsUnlimited());
}
void SleepForSeconds(int seconds) {
sleep(seconds);
}
void SleepForMillis(int millis) {
usleep(millis * 1000);
}
void Abort() {
abort();
}
int Atexit(void (*function)(void)) {
#ifndef SANITIZER_GO
return atexit(function);
#else
return 0;
#endif
}
int internal_isatty(fd_t fd) {
return isatty(fd);
}
} // namespace __sanitizer
#endif // __linux__ || __APPLE_
|
