dee5ea7a0b
From-SVN: r210743
376 lines
12 KiB
C++
376 lines
12 KiB
C++
//===-- tsan_platform_linux.cc --------------------------------------------===//
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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 a part of ThreadSanitizer (TSan), a race detector.
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//
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// Linux-specific code.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_platform.h"
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#if SANITIZER_LINUX
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#include "sanitizer_common/sanitizer_common.h"
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#include "sanitizer_common/sanitizer_libc.h"
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#include "sanitizer_common/sanitizer_procmaps.h"
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#include "sanitizer_common/sanitizer_stoptheworld.h"
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#include "tsan_platform.h"
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#include "tsan_rtl.h"
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#include "tsan_flags.h"
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#include <fcntl.h>
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#include <pthread.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdarg.h>
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#include <sys/mman.h>
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#include <sys/prctl.h>
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#include <sys/syscall.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/resource.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sched.h>
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#include <dlfcn.h>
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#define __need_res_state
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#include <resolv.h>
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#include <malloc.h>
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#ifdef sa_handler
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# undef sa_handler
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#endif
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#ifdef sa_sigaction
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# undef sa_sigaction
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#endif
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extern "C" struct mallinfo __libc_mallinfo();
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namespace __tsan {
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const uptr kPageSize = 4096;
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void FillProfileCallback(uptr start, uptr rss, bool file,
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uptr *mem, uptr stats_size) {
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CHECK_EQ(7, stats_size);
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mem[6] += rss; // total
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start >>= 40;
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if (start < 0x10) // shadow
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mem[0] += rss;
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else if (start >= 0x20 && start < 0x30) // compat modules
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mem[file ? 1 : 2] += rss;
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else if (start >= 0x7e) // modules
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mem[file ? 1 : 2] += rss;
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else if (start >= 0x60 && start < 0x62) // traces
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mem[3] += rss;
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else if (start >= 0x7d && start < 0x7e) // heap
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mem[4] += rss;
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else // other
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mem[5] += rss;
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}
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void WriteMemoryProfile(char *buf, uptr buf_size) {
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uptr mem[7] = {};
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__sanitizer::GetMemoryProfile(FillProfileCallback, mem, 7);
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char *buf_pos = buf;
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char *buf_end = buf + buf_size;
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buf_pos += internal_snprintf(buf_pos, buf_end - buf_pos,
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"RSS %zd MB: shadow:%zd file:%zd mmap:%zd trace:%zd heap:%zd other:%zd\n",
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mem[6] >> 20, mem[0] >> 20, mem[1] >> 20, mem[2] >> 20,
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mem[3] >> 20, mem[4] >> 20, mem[5] >> 20);
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struct mallinfo mi = __libc_mallinfo();
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buf_pos += internal_snprintf(buf_pos, buf_end - buf_pos,
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"mallinfo: arena=%d mmap=%d fordblks=%d keepcost=%d\n",
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mi.arena >> 20, mi.hblkhd >> 20, mi.fordblks >> 20, mi.keepcost >> 20);
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}
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uptr GetRSS() {
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uptr mem[7] = {};
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__sanitizer::GetMemoryProfile(FillProfileCallback, mem, 7);
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return mem[6];
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}
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void FlushShadowMemoryCallback(
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const SuspendedThreadsList &suspended_threads_list,
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void *argument) {
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FlushUnneededShadowMemory(kLinuxShadowBeg, kLinuxShadowEnd - kLinuxShadowBeg);
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}
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void FlushShadowMemory() {
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StopTheWorld(FlushShadowMemoryCallback, 0);
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}
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#ifndef TSAN_GO
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static void ProtectRange(uptr beg, uptr end) {
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CHECK_LE(beg, end);
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if (beg == end)
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return;
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if (beg != (uptr)Mprotect(beg, end - beg)) {
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Printf("FATAL: ThreadSanitizer can not protect [%zx,%zx]\n", beg, end);
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Printf("FATAL: Make sure you are not using unlimited stack\n");
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Die();
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}
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}
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#endif
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#ifndef TSAN_GO
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// Mark shadow for .rodata sections with the special kShadowRodata marker.
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// Accesses to .rodata can't race, so this saves time, memory and trace space.
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static void MapRodata() {
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// First create temp file.
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const char *tmpdir = GetEnv("TMPDIR");
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if (tmpdir == 0)
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tmpdir = GetEnv("TEST_TMPDIR");
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#ifdef P_tmpdir
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if (tmpdir == 0)
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tmpdir = P_tmpdir;
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#endif
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if (tmpdir == 0)
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return;
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char name[256];
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internal_snprintf(name, sizeof(name), "%s/tsan.rodata.%d",
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tmpdir, (int)internal_getpid());
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uptr openrv = internal_open(name, O_RDWR | O_CREAT | O_EXCL, 0600);
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if (internal_iserror(openrv))
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return;
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internal_unlink(name); // Unlink it now, so that we can reuse the buffer.
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fd_t fd = openrv;
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// Fill the file with kShadowRodata.
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const uptr kMarkerSize = 512 * 1024 / sizeof(u64);
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InternalScopedBuffer<u64> marker(kMarkerSize);
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// volatile to prevent insertion of memset
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for (volatile u64 *p = marker.data(); p < marker.data() + kMarkerSize; p++)
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*p = kShadowRodata;
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internal_write(fd, marker.data(), marker.size());
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// Map the file into memory.
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uptr page = internal_mmap(0, kPageSize, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS, fd, 0);
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if (internal_iserror(page)) {
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internal_close(fd);
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return;
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}
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// Map the file into shadow of .rodata sections.
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MemoryMappingLayout proc_maps(/*cache_enabled*/true);
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uptr start, end, offset, prot;
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// Reusing the buffer 'name'.
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while (proc_maps.Next(&start, &end, &offset, name, ARRAY_SIZE(name), &prot)) {
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if (name[0] != 0 && name[0] != '['
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&& (prot & MemoryMappingLayout::kProtectionRead)
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&& (prot & MemoryMappingLayout::kProtectionExecute)
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&& !(prot & MemoryMappingLayout::kProtectionWrite)
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&& IsAppMem(start)) {
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// Assume it's .rodata
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char *shadow_start = (char*)MemToShadow(start);
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char *shadow_end = (char*)MemToShadow(end);
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for (char *p = shadow_start; p < shadow_end; p += marker.size()) {
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internal_mmap(p, Min<uptr>(marker.size(), shadow_end - p),
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PROT_READ, MAP_PRIVATE | MAP_FIXED, fd, 0);
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}
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}
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}
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internal_close(fd);
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}
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void InitializeShadowMemory() {
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uptr shadow = (uptr)MmapFixedNoReserve(kLinuxShadowBeg,
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kLinuxShadowEnd - kLinuxShadowBeg);
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if (shadow != kLinuxShadowBeg) {
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Printf("FATAL: ThreadSanitizer can not mmap the shadow memory\n");
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Printf("FATAL: Make sure to compile with -fPIE and "
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"to link with -pie (%p, %p).\n", shadow, kLinuxShadowBeg);
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Die();
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}
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const uptr kClosedLowBeg = 0x200000;
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const uptr kClosedLowEnd = kLinuxShadowBeg - 1;
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const uptr kClosedMidBeg = kLinuxShadowEnd + 1;
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const uptr kClosedMidEnd = min(kLinuxAppMemBeg, kTraceMemBegin);
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ProtectRange(kClosedLowBeg, kClosedLowEnd);
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ProtectRange(kClosedMidBeg, kClosedMidEnd);
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DPrintf("kClosedLow %zx-%zx (%zuGB)\n",
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kClosedLowBeg, kClosedLowEnd, (kClosedLowEnd - kClosedLowBeg) >> 30);
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DPrintf("kLinuxShadow %zx-%zx (%zuGB)\n",
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kLinuxShadowBeg, kLinuxShadowEnd,
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(kLinuxShadowEnd - kLinuxShadowBeg) >> 30);
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DPrintf("kClosedMid %zx-%zx (%zuGB)\n",
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kClosedMidBeg, kClosedMidEnd, (kClosedMidEnd - kClosedMidBeg) >> 30);
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DPrintf("kLinuxAppMem %zx-%zx (%zuGB)\n",
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kLinuxAppMemBeg, kLinuxAppMemEnd,
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(kLinuxAppMemEnd - kLinuxAppMemBeg) >> 30);
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DPrintf("stack %zx\n", (uptr)&shadow);
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MapRodata();
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}
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#endif
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static uptr g_data_start;
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static uptr g_data_end;
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#ifndef TSAN_GO
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static void CheckPIE() {
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// Ensure that the binary is indeed compiled with -pie.
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MemoryMappingLayout proc_maps(true);
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uptr start, end;
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if (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 ((u64)start < kLinuxAppMemBeg) {
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Printf("FATAL: ThreadSanitizer can not mmap the shadow memory ("
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"something is mapped at 0x%zx < 0x%zx)\n",
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start, kLinuxAppMemBeg);
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Printf("FATAL: Make sure to compile with -fPIE"
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" and to link with -pie.\n");
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Die();
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}
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}
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}
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static void InitDataSeg() {
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MemoryMappingLayout proc_maps(true);
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uptr start, end, offset;
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char name[128];
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bool prev_is_data = false;
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while (proc_maps.Next(&start, &end, &offset, name, ARRAY_SIZE(name),
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/*protection*/ 0)) {
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DPrintf("%p-%p %p %s\n", start, end, offset, name);
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bool is_data = offset != 0 && name[0] != 0;
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// BSS may get merged with [heap] in /proc/self/maps. This is not very
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// reliable.
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bool is_bss = offset == 0 &&
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(name[0] == 0 || internal_strcmp(name, "[heap]") == 0) && prev_is_data;
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if (g_data_start == 0 && is_data)
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g_data_start = start;
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if (is_bss)
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g_data_end = end;
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prev_is_data = is_data;
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}
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DPrintf("guessed data_start=%p data_end=%p\n", g_data_start, g_data_end);
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CHECK_LT(g_data_start, g_data_end);
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CHECK_GE((uptr)&g_data_start, g_data_start);
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CHECK_LT((uptr)&g_data_start, g_data_end);
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}
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#endif // #ifndef TSAN_GO
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static rlim_t getlim(int res) {
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rlimit rlim;
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CHECK_EQ(0, getrlimit(res, &rlim));
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return rlim.rlim_cur;
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}
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static void setlim(int res, rlim_t lim) {
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// The following magic is to prevent clang from replacing it with memset.
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volatile rlimit rlim;
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rlim.rlim_cur = lim;
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rlim.rlim_max = lim;
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setrlimit(res, (rlimit*)&rlim);
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}
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const char *InitializePlatform() {
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void *p = 0;
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if (sizeof(p) == 8) {
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// Disable core dumps, dumping of 16TB usually takes a bit long.
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setlim(RLIMIT_CORE, 0);
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}
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// Go maps shadow memory lazily and works fine with limited address space.
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// Unlimited stack is not a problem as well, because the executable
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// is not compiled with -pie.
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if (kCppMode) {
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bool reexec = false;
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// TSan doesn't play well with unlimited stack size (as stack
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// overlaps with shadow memory). If we detect unlimited stack size,
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// we re-exec the program with limited stack size as a best effort.
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if (getlim(RLIMIT_STACK) == (rlim_t)-1) {
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const uptr kMaxStackSize = 32 * 1024 * 1024;
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VReport(1, "Program is run with unlimited stack size, which wouldn't "
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"work with ThreadSanitizer.\n"
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"Re-execing with stack size limited to %zd bytes.\n",
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kMaxStackSize);
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SetStackSizeLimitInBytes(kMaxStackSize);
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reexec = true;
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}
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if (getlim(RLIMIT_AS) != (rlim_t)-1) {
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Report("WARNING: Program is run with limited virtual address space,"
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" which wouldn't work with ThreadSanitizer.\n");
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Report("Re-execing with unlimited virtual address space.\n");
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setlim(RLIMIT_AS, -1);
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reexec = true;
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}
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if (reexec)
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ReExec();
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}
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#ifndef TSAN_GO
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CheckPIE();
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InitTlsSize();
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InitDataSeg();
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#endif
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return GetEnv(kTsanOptionsEnv);
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}
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bool IsGlobalVar(uptr addr) {
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return g_data_start && addr >= g_data_start && addr < g_data_end;
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}
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#ifndef TSAN_GO
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// Extract file descriptors passed to glibc internal __res_iclose function.
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// This is required to properly "close" the fds, because we do not see internal
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// closes within glibc. The code is a pure hack.
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int ExtractResolvFDs(void *state, int *fds, int nfd) {
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int cnt = 0;
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__res_state *statp = (__res_state*)state;
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for (int i = 0; i < MAXNS && cnt < nfd; i++) {
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if (statp->_u._ext.nsaddrs[i] && statp->_u._ext.nssocks[i] != -1)
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fds[cnt++] = statp->_u._ext.nssocks[i];
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}
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return cnt;
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}
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// Extract file descriptors passed via UNIX domain sockets.
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// This is requried to properly handle "open" of these fds.
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// see 'man recvmsg' and 'man 3 cmsg'.
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int ExtractRecvmsgFDs(void *msgp, int *fds, int nfd) {
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int res = 0;
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msghdr *msg = (msghdr*)msgp;
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struct cmsghdr *cmsg = CMSG_FIRSTHDR(msg);
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for (; cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
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if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS)
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continue;
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int n = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(fds[0]);
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for (int i = 0; i < n; i++) {
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fds[res++] = ((int*)CMSG_DATA(cmsg))[i];
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if (res == nfd)
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return res;
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}
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}
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return res;
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}
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int call_pthread_cancel_with_cleanup(int(*fn)(void *c, void *m,
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void *abstime), void *c, void *m, void *abstime,
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void(*cleanup)(void *arg), void *arg) {
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// pthread_cleanup_push/pop are hardcore macros mess.
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// We can't intercept nor call them w/o including pthread.h.
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int res;
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pthread_cleanup_push(cleanup, arg);
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res = fn(c, m, abstime);
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pthread_cleanup_pop(0);
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return res;
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}
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#endif
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} // namespace __tsan
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#endif // SANITIZER_LINUX
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