forked from OSchip/llvm-project
271 lines
8.7 KiB
C++
271 lines
8.7 KiB
C++
//===-- sanitizer_posix.cc ------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is shared between AddressSanitizer and ThreadSanitizer
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// run-time libraries and implements POSIX-specific functions from
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// sanitizer_libc.h.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_platform.h"
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#if SANITIZER_LINUX || SANITIZER_MAC
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#include "sanitizer_common.h"
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#include "sanitizer_libc.h"
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#include "sanitizer_procmaps.h"
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#include "sanitizer_stacktrace.h"
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#include <sys/mman.h>
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namespace __sanitizer {
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// ------------- sanitizer_common.h
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uptr GetMmapGranularity() {
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return GetPageSize();
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}
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uptr GetMaxVirtualAddress() {
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#if SANITIZER_WORDSIZE == 64
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# if defined(__powerpc64__)
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// On PowerPC64 we have two different address space layouts: 44- and 46-bit.
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// We somehow need to figure our which one we are using now and choose
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// one of 0x00000fffffffffffUL and 0x00003fffffffffffUL.
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// Note that with 'ulimit -s unlimited' the stack is moved away from the top
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// of the address space, so simply checking the stack address is not enough.
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return (1ULL << 44) - 1; // 0x00000fffffffffffUL
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# else
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return (1ULL << 47) - 1; // 0x00007fffffffffffUL;
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# endif
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#else // SANITIZER_WORDSIZE == 32
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// FIXME: We can probably lower this on Android?
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return (1ULL << 32) - 1; // 0xffffffff;
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#endif // SANITIZER_WORDSIZE
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}
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void *MmapOrDie(uptr size, const char *mem_type) {
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size = RoundUpTo(size, GetPageSizeCached());
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uptr res = internal_mmap(0, size,
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PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANON, -1, 0);
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int reserrno;
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if (internal_iserror(res, &reserrno)) {
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static int recursion_count;
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if (recursion_count) {
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// The Report() and CHECK calls below may call mmap recursively and fail.
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// If we went into recursion, just die.
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RawWrite("ERROR: Failed to mmap\n");
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Die();
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}
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recursion_count++;
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Report("ERROR: %s failed to allocate 0x%zx (%zd) bytes of %s: %d\n",
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SanitizerToolName, size, size, mem_type, reserrno);
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DumpProcessMap();
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CHECK("unable to mmap" && 0);
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}
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return (void *)res;
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}
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void UnmapOrDie(void *addr, uptr size) {
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if (!addr || !size) return;
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uptr res = internal_munmap(addr, size);
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if (internal_iserror(res)) {
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Report("ERROR: %s failed to deallocate 0x%zx (%zd) bytes at address %p\n",
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SanitizerToolName, size, size, addr);
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CHECK("unable to unmap" && 0);
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}
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}
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void *MmapNoReserveOrDie(uptr size, const char *mem_type) {
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uptr PageSize = GetPageSizeCached();
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uptr p = internal_mmap(0,
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RoundUpTo(size, PageSize),
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PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANON | MAP_NORESERVE,
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-1, 0);
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int reserrno;
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if (internal_iserror(p, &reserrno)) {
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Report("ERROR: "
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"%s failed to allocate noreserve 0x%zx (%zd) bytes for '%s' (%d)\n",
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SanitizerToolName, size, size, mem_type, reserrno);
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CHECK("unable to mmap" && 0);
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}
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return (void *)p;
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}
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void *MmapFixedNoReserve(uptr fixed_addr, uptr size) {
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uptr PageSize = GetPageSizeCached();
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uptr p = internal_mmap((void*)(fixed_addr & ~(PageSize - 1)),
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RoundUpTo(size, PageSize),
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PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
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-1, 0);
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int reserrno;
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if (internal_iserror(p, &reserrno))
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Report("ERROR: "
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"%s failed to allocate 0x%zx (%zd) bytes at address %zu (%d)\n",
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SanitizerToolName, size, size, fixed_addr, reserrno);
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return (void *)p;
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}
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void *MmapFixedOrDie(uptr fixed_addr, uptr size) {
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uptr PageSize = GetPageSizeCached();
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uptr p = internal_mmap((void*)(fixed_addr & ~(PageSize - 1)),
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RoundUpTo(size, PageSize),
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PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANON | MAP_FIXED,
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-1, 0);
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int reserrno;
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if (internal_iserror(p, &reserrno)) {
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Report("ERROR:"
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" %s failed to allocate 0x%zx (%zd) bytes at address %zu (%d)\n",
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SanitizerToolName, size, size, fixed_addr, reserrno);
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CHECK("unable to mmap" && 0);
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}
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return (void *)p;
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}
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void *Mprotect(uptr fixed_addr, uptr size) {
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return (void *)internal_mmap((void*)fixed_addr, size,
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PROT_NONE,
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MAP_PRIVATE | MAP_ANON | MAP_FIXED |
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MAP_NORESERVE, -1, 0);
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}
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void *MapFileToMemory(const char *file_name, uptr *buff_size) {
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uptr openrv = OpenFile(file_name, false);
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CHECK(!internal_iserror(openrv));
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fd_t fd = openrv;
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uptr fsize = internal_filesize(fd);
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CHECK_NE(fsize, (uptr)-1);
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CHECK_GT(fsize, 0);
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*buff_size = RoundUpTo(fsize, GetPageSizeCached());
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uptr map = internal_mmap(0, *buff_size, PROT_READ, MAP_PRIVATE, fd, 0);
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return internal_iserror(map) ? 0 : (void *)map;
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}
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static inline bool IntervalsAreSeparate(uptr start1, uptr end1,
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uptr start2, uptr end2) {
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CHECK(start1 <= end1);
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CHECK(start2 <= end2);
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return (end1 < start2) || (end2 < start1);
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}
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// FIXME: this is thread-unsafe, but should not cause problems most of the time.
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// When the shadow is mapped only a single thread usually exists (plus maybe
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// several worker threads on Mac, which aren't expected to map big chunks of
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// memory).
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bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
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MemoryMappingLayout proc_maps(/*cache_enabled*/true);
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uptr start, end;
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while (proc_maps.Next(&start, &end,
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/*offset*/0, /*filename*/0, /*filename_size*/0,
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/*protection*/0)) {
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if (!IntervalsAreSeparate(start, end, range_start, range_end))
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return false;
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}
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return true;
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}
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void DumpProcessMap() {
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MemoryMappingLayout proc_maps(/*cache_enabled*/true);
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uptr start, end;
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const sptr kBufSize = 4095;
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char *filename = (char*)MmapOrDie(kBufSize, __FUNCTION__);
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Report("Process memory map follows:\n");
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while (proc_maps.Next(&start, &end, /* file_offset */0,
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filename, kBufSize, /* protection */0)) {
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Printf("\t%p-%p\t%s\n", (void*)start, (void*)end, filename);
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}
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Report("End of process memory map.\n");
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UnmapOrDie(filename, kBufSize);
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}
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const char *GetPwd() {
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return GetEnv("PWD");
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}
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char *FindPathToBinary(const char *name) {
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const char *path = GetEnv("PATH");
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if (!path)
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return 0;
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uptr name_len = internal_strlen(name);
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InternalScopedBuffer<char> buffer(kMaxPathLength);
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const char *beg = path;
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while (true) {
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const char *end = internal_strchrnul(beg, ':');
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uptr prefix_len = end - beg;
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if (prefix_len + name_len + 2 <= kMaxPathLength) {
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internal_memcpy(buffer.data(), beg, prefix_len);
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buffer[prefix_len] = '/';
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internal_memcpy(&buffer[prefix_len + 1], name, name_len);
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buffer[prefix_len + 1 + name_len] = '\0';
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if (FileExists(buffer.data()))
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return internal_strdup(buffer.data());
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}
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if (*end == '\0') break;
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beg = end + 1;
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}
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return 0;
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}
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void MaybeOpenReportFile() {
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if (!log_to_file) return;
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uptr pid = internal_getpid();
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// If in tracer, use the parent's file.
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if (pid == stoptheworld_tracer_pid)
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pid = stoptheworld_tracer_ppid;
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if (report_fd_pid == pid) return;
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InternalScopedBuffer<char> report_path_full(4096);
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internal_snprintf(report_path_full.data(), report_path_full.size(),
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"%s.%zu", report_path_prefix, pid);
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uptr openrv = OpenFile(report_path_full.data(), true);
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if (internal_iserror(openrv)) {
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report_fd = kStderrFd;
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log_to_file = false;
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Report("ERROR: Can't open file: %s\n", report_path_full.data());
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Die();
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}
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if (report_fd != kInvalidFd) {
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// We're in the child. Close the parent's log.
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internal_close(report_fd);
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}
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report_fd = openrv;
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report_fd_pid = pid;
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}
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void RawWrite(const char *buffer) {
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static const char *kRawWriteError =
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"RawWrite can't output requested buffer!\n";
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uptr length = (uptr)internal_strlen(buffer);
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MaybeOpenReportFile();
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if (length != internal_write(report_fd, buffer, length)) {
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internal_write(report_fd, kRawWriteError, internal_strlen(kRawWriteError));
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Die();
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}
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}
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bool GetCodeRangeForFile(const char *module, uptr *start, uptr *end) {
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uptr s, e, off, prot;
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InternalScopedString buff(4096);
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MemoryMappingLayout proc_maps(/*cache_enabled*/false);
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while (proc_maps.Next(&s, &e, &off, buff.data(), buff.size(), &prot)) {
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if ((prot & MemoryMappingLayout::kProtectionExecute) != 0
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&& internal_strcmp(module, buff.data()) == 0) {
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*start = s;
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*end = e;
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return true;
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}
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}
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return false;
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}
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} // namespace __sanitizer
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#endif // SANITIZER_LINUX || SANITIZER_MAC
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