diff options
Diffstat (limited to 'lib/tsan/rtl/tsan_platform_linux.cc')
| -rw-r--r-- | lib/tsan/rtl/tsan_platform_linux.cc | 336 |
1 files changed, 188 insertions, 148 deletions
diff --git a/lib/tsan/rtl/tsan_platform_linux.cc b/lib/tsan/rtl/tsan_platform_linux.cc index 906b5dc73be4a..4dcfa558529c5 100644 --- a/lib/tsan/rtl/tsan_platform_linux.cc +++ b/lib/tsan/rtl/tsan_platform_linux.cc @@ -9,17 +9,18 @@ // // This file is a part of ThreadSanitizer (TSan), a race detector. // -// Linux-specific code. +// Linux- and FreeBSD-specific code. //===----------------------------------------------------------------------===// #include "sanitizer_common/sanitizer_platform.h" -#if SANITIZER_LINUX +#if SANITIZER_LINUX || SANITIZER_FREEBSD #include "sanitizer_common/sanitizer_common.h" #include "sanitizer_common/sanitizer_libc.h" #include "sanitizer_common/sanitizer_procmaps.h" #include "sanitizer_common/sanitizer_stoptheworld.h" +#include "sanitizer_common/sanitizer_stackdepot.h" #include "tsan_platform.h" #include "tsan_rtl.h" #include "tsan_flags.h" @@ -32,8 +33,8 @@ #include <string.h> #include <stdarg.h> #include <sys/mman.h> -#include <sys/prctl.h> #include <sys/syscall.h> +#include <sys/socket.h> #include <sys/time.h> #include <sys/types.h> #include <sys/resource.h> @@ -42,9 +43,10 @@ #include <errno.h> #include <sched.h> #include <dlfcn.h> +#if SANITIZER_LINUX #define __need_res_state #include <resolv.h> -#include <malloc.h> +#endif #ifdef sa_handler # undef sa_handler @@ -54,87 +56,84 @@ # undef sa_sigaction #endif -extern "C" struct mallinfo __libc_mallinfo(); +#if SANITIZER_FREEBSD +extern "C" void *__libc_stack_end; +void *__libc_stack_end = 0; +#endif namespace __tsan { -const uptr kPageSize = 4096; +static uptr g_data_start; +static uptr g_data_end; -#ifndef TSAN_GO -ScopedInRtl::ScopedInRtl() - : thr_(cur_thread()) { - in_rtl_ = thr_->in_rtl; - thr_->in_rtl++; - errno_ = errno; -} +const uptr kPageSize = 4096; -ScopedInRtl::~ScopedInRtl() { - thr_->in_rtl--; - errno = errno_; - CHECK_EQ(in_rtl_, thr_->in_rtl); -} +enum { + MemTotal = 0, + MemShadow = 1, + MemMeta = 2, + MemFile = 3, + MemMmap = 4, + MemTrace = 5, + MemHeap = 6, + MemOther = 7, + MemCount = 8, +}; + +void FillProfileCallback(uptr p, uptr rss, bool file, + uptr *mem, uptr stats_size) { + mem[MemTotal] += rss; + if (p >= kShadowBeg && p < kShadowEnd) + mem[MemShadow] += rss; + else if (p >= kMetaShadowBeg && p < kMetaShadowEnd) + mem[MemMeta] += rss; +#ifndef SANITIZER_GO + else if (p >= kHeapMemBeg && p < kHeapMemEnd) + mem[MemHeap] += rss; + else if (p >= kLoAppMemBeg && p < kLoAppMemEnd) + mem[file ? MemFile : MemMmap] += rss; + else if (p >= kHiAppMemBeg && p < kHiAppMemEnd) + mem[file ? MemFile : MemMmap] += rss; #else -ScopedInRtl::ScopedInRtl() { -} - -ScopedInRtl::~ScopedInRtl() { -} + else if (p >= kAppMemBeg && p < kAppMemEnd) + mem[file ? MemFile : MemMmap] += rss; #endif - -void FillProfileCallback(uptr start, uptr rss, bool file, - uptr *mem, uptr stats_size) { - CHECK_EQ(7, stats_size); - mem[6] += rss; // total - start >>= 40; - if (start < 0x10) // shadow - mem[0] += rss; - else if (start >= 0x20 && start < 0x30) // compat modules - mem[file ? 1 : 2] += rss; - else if (start >= 0x7e) // modules - mem[file ? 1 : 2] += rss; - else if (start >= 0x60 && start < 0x62) // traces - mem[3] += rss; - else if (start >= 0x7d && start < 0x7e) // heap - mem[4] += rss; - else // other - mem[5] += rss; -} - -void WriteMemoryProfile(char *buf, uptr buf_size) { - uptr mem[7] = {}; - __sanitizer::GetMemoryProfile(FillProfileCallback, mem, 7); - char *buf_pos = buf; - char *buf_end = buf + buf_size; - buf_pos += internal_snprintf(buf_pos, buf_end - buf_pos, - "RSS %zd MB: shadow:%zd file:%zd mmap:%zd trace:%zd heap:%zd other:%zd\n", - mem[6] >> 20, mem[0] >> 20, mem[1] >> 20, mem[2] >> 20, - mem[3] >> 20, mem[4] >> 20, mem[5] >> 20); - struct mallinfo mi = __libc_mallinfo(); - buf_pos += internal_snprintf(buf_pos, buf_end - buf_pos, - "mallinfo: arena=%d mmap=%d fordblks=%d keepcost=%d\n", - mi.arena >> 20, mi.hblkhd >> 20, mi.fordblks >> 20, mi.keepcost >> 20); + else if (p >= kTraceMemBeg && p < kTraceMemEnd) + mem[MemTrace] += rss; + else + mem[MemOther] += rss; } -uptr GetRSS() { - uptr mem[7] = {}; +void WriteMemoryProfile(char *buf, uptr buf_size, uptr nthread, uptr nlive) { + uptr mem[MemCount] = {}; __sanitizer::GetMemoryProfile(FillProfileCallback, mem, 7); - return mem[6]; + StackDepotStats *stacks = StackDepotGetStats(); + internal_snprintf(buf, buf_size, + "RSS %zd MB: shadow:%zd meta:%zd file:%zd mmap:%zd" + " trace:%zd heap:%zd other:%zd stacks=%zd[%zd] nthr=%zd/%zd\n", + mem[MemTotal] >> 20, mem[MemShadow] >> 20, mem[MemMeta] >> 20, + mem[MemFile] >> 20, mem[MemMmap] >> 20, mem[MemTrace] >> 20, + mem[MemHeap] >> 20, mem[MemOther] >> 20, + stacks->allocated >> 20, stacks->n_uniq_ids, + nlive, nthread); } - +#if SANITIZER_LINUX void FlushShadowMemoryCallback( const SuspendedThreadsList &suspended_threads_list, void *argument) { - FlushUnneededShadowMemory(kLinuxShadowBeg, kLinuxShadowEnd - kLinuxShadowBeg); + FlushUnneededShadowMemory(kShadowBeg, kShadowEnd - kShadowBeg); } +#endif void FlushShadowMemory() { +#if SANITIZER_LINUX StopTheWorld(FlushShadowMemoryCallback, 0); +#endif } -#ifndef TSAN_GO +#ifndef SANITIZER_GO static void ProtectRange(uptr beg, uptr end) { - ScopedInRtl in_rtl; CHECK_LE(beg, end); if (beg == end) return; @@ -144,9 +143,7 @@ static void ProtectRange(uptr beg, uptr end) { Die(); } } -#endif -#ifndef TSAN_GO // Mark shadow for .rodata sections with the special kShadowRodata marker. // Accesses to .rodata can't race, so this saves time, memory and trace space. static void MapRodata() { @@ -160,17 +157,19 @@ static void MapRodata() { #endif if (tmpdir == 0) return; - char filename[256]; - internal_snprintf(filename, sizeof(filename), "%s/tsan.rodata.%d", + char name[256]; + internal_snprintf(name, sizeof(name), "%s/tsan.rodata.%d", tmpdir, (int)internal_getpid()); - uptr openrv = internal_open(filename, O_RDWR | O_CREAT | O_EXCL, 0600); + uptr openrv = internal_open(name, O_RDWR | O_CREAT | O_EXCL, 0600); if (internal_iserror(openrv)) return; + internal_unlink(name); // Unlink it now, so that we can reuse the buffer. fd_t fd = openrv; // Fill the file with kShadowRodata. const uptr kMarkerSize = 512 * 1024 / sizeof(u64); InternalScopedBuffer<u64> marker(kMarkerSize); - for (u64 *p = marker.data(); p < marker.data() + kMarkerSize; p++) + // volatile to prevent insertion of memset + for (volatile u64 *p = marker.data(); p < marker.data() + kMarkerSize; p++) *p = kShadowRodata; internal_write(fd, marker.data(), marker.size()); // Map the file into memory. @@ -178,13 +177,12 @@ static void MapRodata() { MAP_PRIVATE | MAP_ANONYMOUS, fd, 0); if (internal_iserror(page)) { internal_close(fd); - internal_unlink(filename); return; } // Map the file into shadow of .rodata sections. MemoryMappingLayout proc_maps(/*cache_enabled*/true); uptr start, end, offset, prot; - char name[128]; + // Reusing the buffer 'name'. while (proc_maps.Next(&start, &end, &offset, name, ARRAY_SIZE(name), &prot)) { if (name[0] != 0 && name[0] != '[' && (prot & MemoryMappingLayout::kProtectionRead) @@ -201,66 +199,63 @@ static void MapRodata() { } } internal_close(fd); - internal_unlink(filename); } void InitializeShadowMemory() { - uptr shadow = (uptr)MmapFixedNoReserve(kLinuxShadowBeg, - kLinuxShadowEnd - kLinuxShadowBeg); - if (shadow != kLinuxShadowBeg) { + // Map memory shadow. + uptr shadow = (uptr)MmapFixedNoReserve(kShadowBeg, + kShadowEnd - kShadowBeg); + if (shadow != kShadowBeg) { Printf("FATAL: ThreadSanitizer can not mmap the shadow memory\n"); Printf("FATAL: Make sure to compile with -fPIE and " - "to link with -pie (%p, %p).\n", shadow, kLinuxShadowBeg); + "to link with -pie (%p, %p).\n", shadow, kShadowBeg); Die(); } - const uptr kClosedLowBeg = 0x200000; - const uptr kClosedLowEnd = kLinuxShadowBeg - 1; - const uptr kClosedMidBeg = kLinuxShadowEnd + 1; - const uptr kClosedMidEnd = min(kLinuxAppMemBeg, kTraceMemBegin); - ProtectRange(kClosedLowBeg, kClosedLowEnd); - ProtectRange(kClosedMidBeg, kClosedMidEnd); - DPrintf("kClosedLow %zx-%zx (%zuGB)\n", - kClosedLowBeg, kClosedLowEnd, (kClosedLowEnd - kClosedLowBeg) >> 30); - DPrintf("kLinuxShadow %zx-%zx (%zuGB)\n", - kLinuxShadowBeg, kLinuxShadowEnd, - (kLinuxShadowEnd - kLinuxShadowBeg) >> 30); - DPrintf("kClosedMid %zx-%zx (%zuGB)\n", - kClosedMidBeg, kClosedMidEnd, (kClosedMidEnd - kClosedMidBeg) >> 30); - DPrintf("kLinuxAppMem %zx-%zx (%zuGB)\n", - kLinuxAppMemBeg, kLinuxAppMemEnd, - (kLinuxAppMemEnd - kLinuxAppMemBeg) >> 30); - DPrintf("stack %zx\n", (uptr)&shadow); - - MapRodata(); -} + // This memory range is used for thread stacks and large user mmaps. + // Frequently a thread uses only a small part of stack and similarly + // a program uses a small part of large mmap. On some programs + // we see 20% memory usage reduction without huge pages for this range. +#ifdef MADV_NOHUGEPAGE + madvise((void*)MemToShadow(0x7f0000000000ULL), + 0x10000000000ULL * kShadowMultiplier, MADV_NOHUGEPAGE); #endif - -static uptr g_data_start; -static uptr g_data_end; - -#ifndef TSAN_GO -static void CheckPIE() { - // Ensure that the binary is indeed compiled with -pie. - MemoryMappingLayout proc_maps(true); - uptr start, end; - if (proc_maps.Next(&start, &end, - /*offset*/0, /*filename*/0, /*filename_size*/0, - /*protection*/0)) { - if ((u64)start < kLinuxAppMemBeg) { - Printf("FATAL: ThreadSanitizer can not mmap the shadow memory (" - "something is mapped at 0x%zx < 0x%zx)\n", - start, kLinuxAppMemBeg); - Printf("FATAL: Make sure to compile with -fPIE" - " and to link with -pie.\n"); - Die(); - } + DPrintf("memory shadow: %zx-%zx (%zuGB)\n", + kShadowBeg, kShadowEnd, + (kShadowEnd - kShadowBeg) >> 30); + + // Map meta shadow. + uptr meta_size = kMetaShadowEnd - kMetaShadowBeg; + uptr meta = (uptr)MmapFixedNoReserve(kMetaShadowBeg, meta_size); + if (meta != kMetaShadowBeg) { + Printf("FATAL: ThreadSanitizer can not mmap the shadow memory\n"); + Printf("FATAL: Make sure to compile with -fPIE and " + "to link with -pie (%p, %p).\n", meta, kMetaShadowBeg); + Die(); } + DPrintf("meta shadow: %zx-%zx (%zuGB)\n", + meta, meta + meta_size, meta_size >> 30); + + MapRodata(); } static void InitDataSeg() { MemoryMappingLayout proc_maps(true); uptr start, end, offset; char name[128]; +#if SANITIZER_FREEBSD + // On FreeBSD BSS is usually the last block allocated within the + // low range and heap is the last block allocated within the range + // 0x800000000-0x8ffffffff. + while (proc_maps.Next(&start, &end, &offset, name, ARRAY_SIZE(name), + /*protection*/ 0)) { + DPrintf("%p-%p %p %s\n", start, end, offset, name); + if ((start & 0xffff00000000ULL) == 0 && (end & 0xffff00000000ULL) == 0 && + name[0] == '\0') { + g_data_start = start; + g_data_end = end; + } + } +#else bool prev_is_data = false; while (proc_maps.Next(&start, &end, &offset, name, ARRAY_SIZE(name), /*protection*/ 0)) { @@ -276,34 +271,42 @@ static void InitDataSeg() { g_data_end = end; prev_is_data = is_data; } +#endif DPrintf("guessed data_start=%p data_end=%p\n", g_data_start, g_data_end); CHECK_LT(g_data_start, g_data_end); CHECK_GE((uptr)&g_data_start, g_data_start); CHECK_LT((uptr)&g_data_start, g_data_end); } -#endif // #ifndef TSAN_GO - -static rlim_t getlim(int res) { - rlimit rlim; - CHECK_EQ(0, getrlimit(res, &rlim)); - return rlim.rlim_cur; -} +static void CheckAndProtect() { + // Ensure that the binary is indeed compiled with -pie. + MemoryMappingLayout proc_maps(true); + uptr p, end; + while (proc_maps.Next(&p, &end, 0, 0, 0, 0)) { + if (IsAppMem(p)) + continue; + if (p >= kHeapMemEnd && + p < kHeapMemEnd + PrimaryAllocator::AdditionalSize()) + continue; + if (p >= 0xf000000000000000ull) // vdso + break; + Printf("FATAL: ThreadSanitizer: unexpected memory mapping %p-%p\n", p, end); + Die(); + } -static void setlim(int res, rlim_t lim) { - // The following magic is to prevent clang from replacing it with memset. - volatile rlimit rlim; - rlim.rlim_cur = lim; - rlim.rlim_max = lim; - setrlimit(res, (rlimit*)&rlim); + ProtectRange(kLoAppMemEnd, kShadowBeg); + ProtectRange(kShadowEnd, kMetaShadowBeg); + ProtectRange(kMetaShadowEnd, kTraceMemBeg); + // Memory for traces is mapped lazily in MapThreadTrace. + // Protect the whole range for now, so that user does not map something here. + ProtectRange(kTraceMemBeg, kTraceMemEnd); + ProtectRange(kTraceMemEnd, kHeapMemBeg); + ProtectRange(kHeapMemEnd + PrimaryAllocator::AdditionalSize(), kHiAppMemBeg); } +#endif // #ifndef SANITIZER_GO -const char *InitializePlatform() { - void *p = 0; - if (sizeof(p) == 8) { - // Disable core dumps, dumping of 16TB usually takes a bit long. - setlim(RLIMIT_CORE, 0); - } +void InitializePlatform() { + DisableCoreDumperIfNecessary(); // Go maps shadow memory lazily and works fine with limited address space. // Unlimited stack is not a problem as well, because the executable @@ -313,41 +316,44 @@ const char *InitializePlatform() { // TSan doesn't play well with unlimited stack size (as stack // overlaps with shadow memory). If we detect unlimited stack size, // we re-exec the program with limited stack size as a best effort. - if (getlim(RLIMIT_STACK) == (rlim_t)-1) { + if (StackSizeIsUnlimited()) { const uptr kMaxStackSize = 32 * 1024 * 1024; - Report("WARNING: Program is run with unlimited stack size, which " - "wouldn't work with ThreadSanitizer.\n"); - Report("Re-execing with stack size limited to %zd bytes.\n", - kMaxStackSize); + VReport(1, "Program is run with unlimited stack size, which wouldn't " + "work with ThreadSanitizer.\n" + "Re-execing with stack size limited to %zd bytes.\n", + kMaxStackSize); SetStackSizeLimitInBytes(kMaxStackSize); reexec = true; } - if (getlim(RLIMIT_AS) != (rlim_t)-1) { + if (!AddressSpaceIsUnlimited()) { Report("WARNING: Program is run with limited virtual address space," " which wouldn't work with ThreadSanitizer.\n"); Report("Re-execing with unlimited virtual address space.\n"); - setlim(RLIMIT_AS, -1); + SetAddressSpaceUnlimited(); reexec = true; } if (reexec) ReExec(); } -#ifndef TSAN_GO - CheckPIE(); +#ifndef SANITIZER_GO + CheckAndProtect(); InitTlsSize(); InitDataSeg(); #endif - return GetEnv(kTsanOptionsEnv); } bool IsGlobalVar(uptr addr) { return g_data_start && addr >= g_data_start && addr < g_data_end; } -#ifndef TSAN_GO +#ifndef SANITIZER_GO +// Extract file descriptors passed to glibc internal __res_iclose function. +// This is required to properly "close" the fds, because we do not see internal +// closes within glibc. The code is a pure hack. int ExtractResolvFDs(void *state, int *fds, int nfd) { +#if SANITIZER_LINUX int cnt = 0; __res_state *statp = (__res_state*)state; for (int i = 0; i < MAXNS && cnt < nfd; i++) { @@ -355,10 +361,44 @@ int ExtractResolvFDs(void *state, int *fds, int nfd) { fds[cnt++] = statp->_u._ext.nssocks[i]; } return cnt; -} +#else + return 0; #endif +} + +// 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; +} +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 } // namespace __tsan -#endif // SANITIZER_LINUX +#endif // SANITIZER_LINUX || SANITIZER_FREEBSD |