2014-09-21 17:33:12 +00:00
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//===-- 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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2015-08-28 15:33:40 +00:00
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// Linux- and FreeBSD-specific code.
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2014-09-21 17:33:12 +00:00
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_platform.h"
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2015-08-28 15:33:40 +00:00
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#if SANITIZER_LINUX || SANITIZER_FREEBSD
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2014-09-21 17:33:12 +00:00
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#include "sanitizer_common/sanitizer_common.h"
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#include "sanitizer_common/sanitizer_libc.h"
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2017-04-10 11:32:00 +00:00
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#include "sanitizer_common/sanitizer_posix.h"
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2014-09-21 17:33:12 +00:00
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#include "sanitizer_common/sanitizer_procmaps.h"
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#include "sanitizer_common/sanitizer_stoptheworld.h"
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2015-08-28 15:33:40 +00:00
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#include "sanitizer_common/sanitizer_stackdepot.h"
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2014-09-21 17:33:12 +00:00
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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/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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2015-08-28 15:33:40 +00:00
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#if SANITIZER_LINUX
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2014-09-21 17:33:12 +00:00
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#define __need_res_state
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#include <resolv.h>
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2015-08-28 15:33:40 +00:00
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#endif
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2014-09-21 17:33:12 +00:00
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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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2015-08-28 15:33:40 +00:00
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#if SANITIZER_FREEBSD
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extern "C" void *__libc_stack_end;
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void *__libc_stack_end = 0;
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#endif
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2014-09-21 17:33:12 +00:00
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2017-04-10 11:32:00 +00:00
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#if SANITIZER_LINUX && defined(__aarch64__)
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void InitializeGuardPtr() __attribute__((visibility("hidden")));
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#endif
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2014-09-21 17:33:12 +00:00
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namespace __tsan {
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2015-08-28 15:33:40 +00:00
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static uptr g_data_start;
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static uptr g_data_end;
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enum {
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MemTotal = 0,
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MemShadow = 1,
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MemMeta = 2,
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MemFile = 3,
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MemMmap = 4,
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MemTrace = 5,
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MemHeap = 6,
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MemOther = 7,
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MemCount = 8,
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};
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void FillProfileCallback(uptr p, uptr rss, bool file,
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uptr *mem, uptr stats_size) {
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mem[MemTotal] += rss;
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if (p >= kShadowBeg && p < kShadowEnd)
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mem[MemShadow] += rss;
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else if (p >= kMetaShadowBeg && p < kMetaShadowEnd)
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mem[MemMeta] += rss;
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2017-04-10 11:32:00 +00:00
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#ifndef SANITIZER_GO
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2015-08-28 15:33:40 +00:00
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else if (p >= kHeapMemBeg && p < kHeapMemEnd)
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mem[MemHeap] += rss;
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else if (p >= kLoAppMemBeg && p < kLoAppMemEnd)
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mem[file ? MemFile : MemMmap] += rss;
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else if (p >= kHiAppMemBeg && p < kHiAppMemEnd)
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mem[file ? MemFile : MemMmap] += rss;
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2014-09-21 17:33:12 +00:00
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#else
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2015-08-28 15:33:40 +00:00
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else if (p >= kAppMemBeg && p < kAppMemEnd)
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mem[file ? MemFile : MemMmap] += rss;
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2014-09-21 17:33:12 +00:00
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#endif
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2015-08-28 15:33:40 +00:00
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else if (p >= kTraceMemBeg && p < kTraceMemEnd)
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mem[MemTrace] += rss;
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else
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mem[MemOther] += rss;
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2014-09-21 17:33:12 +00:00
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}
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2015-08-28 15:33:40 +00:00
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void WriteMemoryProfile(char *buf, uptr buf_size, uptr nthread, uptr nlive) {
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uptr mem[MemCount] = {};
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2014-09-21 17:33:12 +00:00
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__sanitizer::GetMemoryProfile(FillProfileCallback, mem, 7);
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2015-08-28 15:33:40 +00:00
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StackDepotStats *stacks = StackDepotGetStats();
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internal_snprintf(buf, buf_size,
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"RSS %zd MB: shadow:%zd meta:%zd file:%zd mmap:%zd"
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" trace:%zd heap:%zd other:%zd stacks=%zd[%zd] nthr=%zd/%zd\n",
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mem[MemTotal] >> 20, mem[MemShadow] >> 20, mem[MemMeta] >> 20,
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mem[MemFile] >> 20, mem[MemMmap] >> 20, mem[MemTrace] >> 20,
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mem[MemHeap] >> 20, mem[MemOther] >> 20,
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stacks->allocated >> 20, stacks->n_uniq_ids,
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nlive, nthread);
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2014-09-21 17:33:12 +00:00
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}
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2015-08-28 15:33:40 +00:00
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#if SANITIZER_LINUX
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2014-09-21 17:33:12 +00:00
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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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2015-08-28 15:33:40 +00:00
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FlushUnneededShadowMemory(kShadowBeg, kShadowEnd - kShadowBeg);
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2014-09-21 17:33:12 +00:00
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}
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2015-08-28 15:33:40 +00:00
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#endif
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2014-09-21 17:33:12 +00:00
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void FlushShadowMemory() {
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2015-08-28 15:33:40 +00:00
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#if SANITIZER_LINUX
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2014-09-21 17:33:12 +00:00
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StopTheWorld(FlushShadowMemoryCallback, 0);
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2015-08-28 15:33:40 +00:00
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#endif
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2014-09-21 17:33:12 +00:00
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}
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2017-04-10 11:32:00 +00:00
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#ifndef SANITIZER_GO
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2014-09-21 17:33:12 +00:00
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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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2015-08-28 15:33:40 +00:00
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char name[256];
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internal_snprintf(name, sizeof(name), "%s/tsan.rodata.%d",
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2014-09-21 17:33:12 +00:00
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tmpdir, (int)internal_getpid());
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2015-08-28 15:33:40 +00:00
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uptr openrv = internal_open(name, O_RDWR | O_CREAT | O_EXCL, 0600);
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2014-09-21 17:33:12 +00:00
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if (internal_iserror(openrv))
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return;
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2015-08-28 15:33:40 +00:00
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internal_unlink(name); // Unlink it now, so that we can reuse the buffer.
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2014-09-21 17:33:12 +00:00
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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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2015-08-28 15:33:40 +00:00
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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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2014-09-21 17:33:12 +00:00
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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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2017-04-10 11:32:00 +00:00
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uptr page = internal_mmap(0, GetPageSizeCached(), PROT_READ | PROT_WRITE,
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2014-09-21 17:33:12 +00:00
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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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2015-08-28 15:33:40 +00:00
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// Reusing the buffer 'name'.
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2014-09-21 17:33:12 +00:00
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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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2017-04-10 11:32:00 +00:00
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void InitializeShadowMemoryPlatform() {
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2015-08-28 15:33:40 +00:00
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MapRodata();
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2014-09-21 17:33:12 +00:00
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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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2015-08-28 15:33:40 +00:00
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#if SANITIZER_FREEBSD
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// On FreeBSD BSS is usually the last block allocated within the
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// low range and heap is the last block allocated within the range
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// 0x800000000-0x8ffffffff.
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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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if ((start & 0xffff00000000ULL) == 0 && (end & 0xffff00000000ULL) == 0 &&
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name[0] == '\0') {
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g_data_start = start;
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g_data_end = end;
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}
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}
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#else
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2014-09-21 17:33:12 +00:00
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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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2015-08-28 15:33:40 +00:00
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#endif
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2014-09-21 17:33:12 +00:00
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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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2017-04-10 11:32:00 +00:00
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#endif // #ifndef SANITIZER_GO
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2014-09-21 17:33:12 +00:00
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2015-08-28 15:33:40 +00:00
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void InitializePlatform() {
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DisableCoreDumperIfNecessary();
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2014-09-21 17:33:12 +00:00
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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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2015-08-28 15:33:40 +00:00
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if (StackSizeIsUnlimited()) {
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2014-09-21 17:33:12 +00:00
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const uptr kMaxStackSize = 32 * 1024 * 1024;
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2015-08-28 15:33:40 +00:00
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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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2014-09-21 17:33:12 +00:00
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SetStackSizeLimitInBytes(kMaxStackSize);
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reexec = true;
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}
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2015-08-28 15:33:40 +00:00
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if (!AddressSpaceIsUnlimited()) {
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2014-09-21 17:33:12 +00:00
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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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2015-08-28 15:33:40 +00:00
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SetAddressSpaceUnlimited();
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2014-09-21 17:33:12 +00:00
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reexec = true;
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}
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2017-04-10 11:32:00 +00:00
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#if SANITIZER_LINUX && defined(__aarch64__)
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// Initialize the guard pointer used in {sig}{set,long}jump.
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InitializeGuardPtr();
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#endif
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2014-09-21 17:33:12 +00:00
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if (reexec)
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ReExec();
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}
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2017-04-10 11:32:00 +00:00
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#ifndef SANITIZER_GO
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2015-08-28 15:33:40 +00:00
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CheckAndProtect();
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2014-09-21 17:33:12 +00:00
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InitTlsSize();
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InitDataSeg();
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#endif
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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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2017-04-10 11:32:00 +00:00
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#ifndef SANITIZER_GO
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2014-09-21 17:33:12 +00:00
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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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2015-08-28 15:33:40 +00:00
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#if SANITIZER_LINUX
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2014-09-21 17:33:12 +00:00
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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)
|
|
|
|
fds[cnt++] = statp->_u._ext.nssocks[i];
|
|
|
|
}
|
|
|
|
return cnt;
|
2015-08-28 15:33:40 +00:00
|
|
|
#else
|
|
|
|
return 0;
|
|
|
|
#endif
|
2014-09-21 17:33:12 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// Extract file descriptors passed via UNIX domain sockets.
|
|
|
|
// This is requried to properly handle "open" of these fds.
|
|
|
|
// see 'man recvmsg' and 'man 3 cmsg'.
|
|
|
|
int ExtractRecvmsgFDs(void *msgp, int *fds, int nfd) {
|
|
|
|
int res = 0;
|
|
|
|
msghdr *msg = (msghdr*)msgp;
|
|
|
|
struct cmsghdr *cmsg = CMSG_FIRSTHDR(msg);
|
|
|
|
for (; cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
|
|
|
|
if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS)
|
|
|
|
continue;
|
|
|
|
int n = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(fds[0]);
|
|
|
|
for (int i = 0; i < n; i++) {
|
|
|
|
fds[res++] = ((int*)CMSG_DATA(cmsg))[i];
|
|
|
|
if (res == nfd)
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
2017-04-10 11:32:00 +00:00
|
|
|
// Note: this function runs with async signals enabled,
|
|
|
|
// so it must not touch any tsan state.
|
2015-08-28 15:33:40 +00:00
|
|
|
int call_pthread_cancel_with_cleanup(int(*fn)(void *c, void *m,
|
|
|
|
void *abstime), void *c, void *m, void *abstime,
|
|
|
|
void(*cleanup)(void *arg), void *arg) {
|
|
|
|
// pthread_cleanup_push/pop are hardcore macros mess.
|
|
|
|
// We can't intercept nor call them w/o including pthread.h.
|
|
|
|
int res;
|
|
|
|
pthread_cleanup_push(cleanup, arg);
|
|
|
|
res = fn(c, m, abstime);
|
|
|
|
pthread_cleanup_pop(0);
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
#endif
|
2014-09-21 17:33:12 +00:00
|
|
|
|
2017-04-10 11:32:00 +00:00
|
|
|
#ifndef SANITIZER_GO
|
|
|
|
void ReplaceSystemMalloc() { }
|
|
|
|
#endif
|
|
|
|
|
2014-09-21 17:33:12 +00:00
|
|
|
} // namespace __tsan
|
|
|
|
|
2015-08-28 15:33:40 +00:00
|
|
|
#endif // SANITIZER_LINUX || SANITIZER_FREEBSD
|