forked from OSchip/llvm-project
851 lines
26 KiB
C++
851 lines
26 KiB
C++
//===-- sanitizer_linux_libcdep.cc ----------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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 linux-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_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD || \
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SANITIZER_OPENBSD || SANITIZER_SOLARIS
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#include "sanitizer_allocator_internal.h"
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#include "sanitizer_atomic.h"
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#include "sanitizer_common.h"
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#include "sanitizer_file.h"
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#include "sanitizer_flags.h"
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#include "sanitizer_freebsd.h"
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#include "sanitizer_getauxval.h"
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#include "sanitizer_linux.h"
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#include "sanitizer_placement_new.h"
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#include "sanitizer_procmaps.h"
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#include <dlfcn.h> // for dlsym()
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#include <link.h>
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#include <pthread.h>
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#include <signal.h>
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#include <sys/resource.h>
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#include <syslog.h>
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#if SANITIZER_FREEBSD
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#include <pthread_np.h>
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#include <osreldate.h>
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#include <sys/sysctl.h>
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#define pthread_getattr_np pthread_attr_get_np
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#endif
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#if SANITIZER_OPENBSD
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#include <pthread_np.h>
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#include <sys/sysctl.h>
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#endif
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#if SANITIZER_NETBSD
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#include <sys/sysctl.h>
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#include <sys/tls.h>
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#endif
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#if SANITIZER_SOLARIS
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#include <stdlib.h>
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#include <thread.h>
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#endif
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#if SANITIZER_ANDROID
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#include <android/api-level.h>
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#if !defined(CPU_COUNT) && !defined(__aarch64__)
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#include <dirent.h>
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#include <fcntl.h>
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struct __sanitizer::linux_dirent {
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long d_ino;
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off_t d_off;
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unsigned short d_reclen;
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char d_name[];
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};
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#endif
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#endif
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#if !SANITIZER_ANDROID
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#include <elf.h>
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#include <unistd.h>
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#endif
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namespace __sanitizer {
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SANITIZER_WEAK_ATTRIBUTE int
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real_sigaction(int signum, const void *act, void *oldact);
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int internal_sigaction(int signum, const void *act, void *oldact) {
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#if !SANITIZER_GO
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if (&real_sigaction)
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return real_sigaction(signum, act, oldact);
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#endif
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return sigaction(signum, (const struct sigaction *)act,
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(struct sigaction *)oldact);
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}
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void GetThreadStackTopAndBottom(bool at_initialization, uptr *stack_top,
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uptr *stack_bottom) {
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CHECK(stack_top);
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CHECK(stack_bottom);
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if (at_initialization) {
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// This is the main thread. Libpthread may not be initialized yet.
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struct rlimit rl;
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CHECK_EQ(getrlimit(RLIMIT_STACK, &rl), 0);
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// Find the mapping that contains a stack variable.
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MemoryMappingLayout proc_maps(/*cache_enabled*/true);
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if (proc_maps.Error()) {
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*stack_top = *stack_bottom = 0;
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return;
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}
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MemoryMappedSegment segment;
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uptr prev_end = 0;
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while (proc_maps.Next(&segment)) {
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if ((uptr)&rl < segment.end) break;
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prev_end = segment.end;
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}
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CHECK((uptr)&rl >= segment.start && (uptr)&rl < segment.end);
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// Get stacksize from rlimit, but clip it so that it does not overlap
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// with other mappings.
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uptr stacksize = rl.rlim_cur;
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if (stacksize > segment.end - prev_end) stacksize = segment.end - prev_end;
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// When running with unlimited stack size, we still want to set some limit.
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// The unlimited stack size is caused by 'ulimit -s unlimited'.
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// Also, for some reason, GNU make spawns subprocesses with unlimited stack.
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if (stacksize > kMaxThreadStackSize)
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stacksize = kMaxThreadStackSize;
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*stack_top = segment.end;
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*stack_bottom = segment.end - stacksize;
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return;
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}
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uptr stacksize = 0;
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void *stackaddr = nullptr;
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#if SANITIZER_SOLARIS
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stack_t ss;
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CHECK_EQ(thr_stksegment(&ss), 0);
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stacksize = ss.ss_size;
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stackaddr = (char *)ss.ss_sp - stacksize;
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#elif SANITIZER_OPENBSD
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stack_t sattr;
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CHECK_EQ(pthread_stackseg_np(pthread_self(), &sattr), 0);
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stackaddr = sattr.ss_sp;
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stacksize = sattr.ss_size;
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#else // !SANITIZER_SOLARIS
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pthread_attr_t attr;
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pthread_attr_init(&attr);
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CHECK_EQ(pthread_getattr_np(pthread_self(), &attr), 0);
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my_pthread_attr_getstack(&attr, &stackaddr, &stacksize);
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pthread_attr_destroy(&attr);
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#endif // SANITIZER_SOLARIS
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*stack_top = (uptr)stackaddr + stacksize;
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*stack_bottom = (uptr)stackaddr;
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}
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#if !SANITIZER_GO
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bool SetEnv(const char *name, const char *value) {
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void *f = dlsym(RTLD_NEXT, "setenv");
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if (!f)
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return false;
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typedef int(*setenv_ft)(const char *name, const char *value, int overwrite);
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setenv_ft setenv_f;
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CHECK_EQ(sizeof(setenv_f), sizeof(f));
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internal_memcpy(&setenv_f, &f, sizeof(f));
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return setenv_f(name, value, 1) == 0;
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}
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#endif
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__attribute__((unused)) static bool GetLibcVersion(int *major, int *minor,
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int *patch) {
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#ifdef _CS_GNU_LIBC_VERSION
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char buf[64];
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uptr len = confstr(_CS_GNU_LIBC_VERSION, buf, sizeof(buf));
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if (len >= sizeof(buf))
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return false;
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buf[len] = 0;
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static const char kGLibC[] = "glibc ";
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if (internal_strncmp(buf, kGLibC, sizeof(kGLibC) - 1) != 0)
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return false;
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const char *p = buf + sizeof(kGLibC) - 1;
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*major = internal_simple_strtoll(p, &p, 10);
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*minor = (*p == '.') ? internal_simple_strtoll(p + 1, &p, 10) : 0;
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*patch = (*p == '.') ? internal_simple_strtoll(p + 1, &p, 10) : 0;
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return true;
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#else
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return false;
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#endif
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}
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#if !SANITIZER_FREEBSD && !SANITIZER_ANDROID && !SANITIZER_GO && \
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!SANITIZER_NETBSD && !SANITIZER_OPENBSD && !SANITIZER_SOLARIS
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static uptr g_tls_size;
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#ifdef __i386__
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# ifndef __GLIBC_PREREQ
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# define CHECK_GET_TLS_STATIC_INFO_VERSION 1
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# else
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# define CHECK_GET_TLS_STATIC_INFO_VERSION (!__GLIBC_PREREQ(2, 27))
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# endif
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#else
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# define CHECK_GET_TLS_STATIC_INFO_VERSION 0
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#endif
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#if CHECK_GET_TLS_STATIC_INFO_VERSION
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# define DL_INTERNAL_FUNCTION __attribute__((regparm(3), stdcall))
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#else
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# define DL_INTERNAL_FUNCTION
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#endif
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namespace {
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struct GetTlsStaticInfoCall {
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typedef void (*get_tls_func)(size_t*, size_t*);
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};
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struct GetTlsStaticInfoRegparmCall {
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typedef void (*get_tls_func)(size_t*, size_t*) DL_INTERNAL_FUNCTION;
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};
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template <typename T>
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void CallGetTls(void* ptr, size_t* size, size_t* align) {
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typename T::get_tls_func get_tls;
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CHECK_EQ(sizeof(get_tls), sizeof(ptr));
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internal_memcpy(&get_tls, &ptr, sizeof(ptr));
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CHECK_NE(get_tls, 0);
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get_tls(size, align);
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}
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bool CmpLibcVersion(int major, int minor, int patch) {
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int ma;
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int mi;
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int pa;
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if (!GetLibcVersion(&ma, &mi, &pa))
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return false;
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if (ma > major)
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return true;
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if (ma < major)
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return false;
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if (mi > minor)
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return true;
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if (mi < minor)
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return false;
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return pa >= patch;
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}
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} // namespace
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void InitTlsSize() {
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// all current supported platforms have 16 bytes stack alignment
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const size_t kStackAlign = 16;
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void *get_tls_static_info_ptr = dlsym(RTLD_NEXT, "_dl_get_tls_static_info");
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size_t tls_size = 0;
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size_t tls_align = 0;
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// On i?86, _dl_get_tls_static_info used to be internal_function, i.e.
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// __attribute__((regparm(3), stdcall)) before glibc 2.27 and is normal
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// function in 2.27 and later.
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if (CHECK_GET_TLS_STATIC_INFO_VERSION && !CmpLibcVersion(2, 27, 0))
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CallGetTls<GetTlsStaticInfoRegparmCall>(get_tls_static_info_ptr,
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&tls_size, &tls_align);
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else
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CallGetTls<GetTlsStaticInfoCall>(get_tls_static_info_ptr,
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&tls_size, &tls_align);
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if (tls_align < kStackAlign)
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tls_align = kStackAlign;
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g_tls_size = RoundUpTo(tls_size, tls_align);
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}
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#else
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void InitTlsSize() { }
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#endif // !SANITIZER_FREEBSD && !SANITIZER_ANDROID && !SANITIZER_GO &&
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// !SANITIZER_NETBSD && !SANITIZER_SOLARIS
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#if (defined(__x86_64__) || defined(__i386__) || defined(__mips__) || \
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defined(__aarch64__) || defined(__powerpc64__) || defined(__s390__) || \
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defined(__arm__)) && \
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SANITIZER_LINUX && !SANITIZER_ANDROID
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// sizeof(struct pthread) from glibc.
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static atomic_uintptr_t thread_descriptor_size;
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uptr ThreadDescriptorSize() {
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uptr val = atomic_load_relaxed(&thread_descriptor_size);
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if (val)
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return val;
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#if defined(__x86_64__) || defined(__i386__) || defined(__arm__)
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int major;
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int minor;
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int patch;
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if (GetLibcVersion(&major, &minor, &patch) && major == 2) {
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/* sizeof(struct pthread) values from various glibc versions. */
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if (SANITIZER_X32)
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val = 1728; // Assume only one particular version for x32.
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// For ARM sizeof(struct pthread) changed in Glibc 2.23.
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else if (SANITIZER_ARM)
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val = minor <= 22 ? 1120 : 1216;
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else if (minor <= 3)
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val = FIRST_32_SECOND_64(1104, 1696);
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else if (minor == 4)
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val = FIRST_32_SECOND_64(1120, 1728);
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else if (minor == 5)
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val = FIRST_32_SECOND_64(1136, 1728);
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else if (minor <= 9)
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val = FIRST_32_SECOND_64(1136, 1712);
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else if (minor == 10)
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val = FIRST_32_SECOND_64(1168, 1776);
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else if (minor == 11 || (minor == 12 && patch == 1))
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val = FIRST_32_SECOND_64(1168, 2288);
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else if (minor <= 14)
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val = FIRST_32_SECOND_64(1168, 2304);
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else
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val = FIRST_32_SECOND_64(1216, 2304);
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}
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#elif defined(__mips__)
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// TODO(sagarthakur): add more values as per different glibc versions.
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val = FIRST_32_SECOND_64(1152, 1776);
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#elif defined(__aarch64__)
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// The sizeof (struct pthread) is the same from GLIBC 2.17 to 2.22.
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val = 1776;
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#elif defined(__powerpc64__)
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val = 1776; // from glibc.ppc64le 2.20-8.fc21
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#elif defined(__s390__)
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val = FIRST_32_SECOND_64(1152, 1776); // valid for glibc 2.22
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#endif
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if (val)
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atomic_store_relaxed(&thread_descriptor_size, val);
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return val;
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}
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// The offset at which pointer to self is located in the thread descriptor.
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const uptr kThreadSelfOffset = FIRST_32_SECOND_64(8, 16);
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uptr ThreadSelfOffset() {
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return kThreadSelfOffset;
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}
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#if defined(__mips__) || defined(__powerpc64__)
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// TlsPreTcbSize includes size of struct pthread_descr and size of tcb
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// head structure. It lies before the static tls blocks.
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static uptr TlsPreTcbSize() {
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# if defined(__mips__)
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const uptr kTcbHead = 16; // sizeof (tcbhead_t)
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# elif defined(__powerpc64__)
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const uptr kTcbHead = 88; // sizeof (tcbhead_t)
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# endif
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const uptr kTlsAlign = 16;
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const uptr kTlsPreTcbSize =
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RoundUpTo(ThreadDescriptorSize() + kTcbHead, kTlsAlign);
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return kTlsPreTcbSize;
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}
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#endif
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uptr ThreadSelf() {
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uptr descr_addr;
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# if defined(__i386__)
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asm("mov %%gs:%c1,%0" : "=r"(descr_addr) : "i"(kThreadSelfOffset));
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# elif defined(__x86_64__)
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asm("mov %%fs:%c1,%0" : "=r"(descr_addr) : "i"(kThreadSelfOffset));
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# elif defined(__mips__)
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// MIPS uses TLS variant I. The thread pointer (in hardware register $29)
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// points to the end of the TCB + 0x7000. The pthread_descr structure is
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// immediately in front of the TCB. TlsPreTcbSize() includes the size of the
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// TCB and the size of pthread_descr.
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const uptr kTlsTcbOffset = 0x7000;
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uptr thread_pointer;
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asm volatile(".set push;\
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.set mips64r2;\
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rdhwr %0,$29;\
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.set pop" : "=r" (thread_pointer));
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descr_addr = thread_pointer - kTlsTcbOffset - TlsPreTcbSize();
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# elif defined(__aarch64__) || defined(__arm__)
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descr_addr = reinterpret_cast<uptr>(__builtin_thread_pointer()) -
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ThreadDescriptorSize();
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# elif defined(__s390__)
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descr_addr = reinterpret_cast<uptr>(__builtin_thread_pointer());
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# elif defined(__powerpc64__)
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// PPC64LE uses TLS variant I. The thread pointer (in GPR 13)
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// points to the end of the TCB + 0x7000. The pthread_descr structure is
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// immediately in front of the TCB. TlsPreTcbSize() includes the size of the
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// TCB and the size of pthread_descr.
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const uptr kTlsTcbOffset = 0x7000;
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uptr thread_pointer;
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asm("addi %0,13,%1" : "=r"(thread_pointer) : "I"(-kTlsTcbOffset));
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descr_addr = thread_pointer - TlsPreTcbSize();
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# else
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# error "unsupported CPU arch"
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# endif
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return descr_addr;
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}
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#endif // (x86_64 || i386 || MIPS) && SANITIZER_LINUX
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#if SANITIZER_FREEBSD
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static void **ThreadSelfSegbase() {
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void **segbase = 0;
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# if defined(__i386__)
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// sysarch(I386_GET_GSBASE, segbase);
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__asm __volatile("mov %%gs:0, %0" : "=r" (segbase));
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# elif defined(__x86_64__)
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// sysarch(AMD64_GET_FSBASE, segbase);
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__asm __volatile("movq %%fs:0, %0" : "=r" (segbase));
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# else
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# error "unsupported CPU arch"
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# endif
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return segbase;
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}
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uptr ThreadSelf() {
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return (uptr)ThreadSelfSegbase()[2];
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}
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#endif // SANITIZER_FREEBSD
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#if SANITIZER_NETBSD
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static struct tls_tcb * ThreadSelfTlsTcb() {
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struct tls_tcb * tcb;
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# ifdef __HAVE___LWP_GETTCB_FAST
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tcb = (struct tls_tcb *)__lwp_gettcb_fast();
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# elif defined(__HAVE___LWP_GETPRIVATE_FAST)
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tcb = (struct tls_tcb *)__lwp_getprivate_fast();
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# endif
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return tcb;
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}
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uptr ThreadSelf() {
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return (uptr)ThreadSelfTlsTcb()->tcb_pthread;
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}
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int GetSizeFromHdr(struct dl_phdr_info *info, size_t size, void *data) {
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const Elf_Phdr *hdr = info->dlpi_phdr;
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const Elf_Phdr *last_hdr = hdr + info->dlpi_phnum;
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for (; hdr != last_hdr; ++hdr) {
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if (hdr->p_type == PT_TLS && info->dlpi_tls_modid == 1) {
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*(uptr*)data = hdr->p_memsz;
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break;
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}
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}
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return 0;
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}
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#endif // SANITIZER_NETBSD
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#if !SANITIZER_GO
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static void GetTls(uptr *addr, uptr *size) {
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#if SANITIZER_LINUX && !SANITIZER_ANDROID
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# if defined(__x86_64__) || defined(__i386__) || defined(__s390__)
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*addr = ThreadSelf();
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*size = GetTlsSize();
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*addr -= *size;
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*addr += ThreadDescriptorSize();
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# elif defined(__mips__) || defined(__aarch64__) || defined(__powerpc64__) \
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|| defined(__arm__)
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*addr = ThreadSelf();
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*size = GetTlsSize();
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# else
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*addr = 0;
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*size = 0;
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# endif
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#elif SANITIZER_FREEBSD
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void** segbase = ThreadSelfSegbase();
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*addr = 0;
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*size = 0;
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if (segbase != 0) {
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// tcbalign = 16
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// tls_size = round(tls_static_space, tcbalign);
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// dtv = segbase[1];
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// dtv[2] = segbase - tls_static_space;
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void **dtv = (void**) segbase[1];
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*addr = (uptr) dtv[2];
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|
*size = (*addr == 0) ? 0 : ((uptr) segbase[0] - (uptr) dtv[2]);
|
|
}
|
|
#elif SANITIZER_NETBSD
|
|
struct tls_tcb * const tcb = ThreadSelfTlsTcb();
|
|
*addr = 0;
|
|
*size = 0;
|
|
if (tcb != 0) {
|
|
// Find size (p_memsz) of dlpi_tls_modid 1 (TLS block of the main program).
|
|
// ld.elf_so hardcodes the index 1.
|
|
dl_iterate_phdr(GetSizeFromHdr, size);
|
|
|
|
if (*size != 0) {
|
|
// The block has been found and tcb_dtv[1] contains the base address
|
|
*addr = (uptr)tcb->tcb_dtv[1];
|
|
}
|
|
}
|
|
#elif SANITIZER_OPENBSD
|
|
*addr = 0;
|
|
*size = 0;
|
|
#elif SANITIZER_ANDROID
|
|
*addr = 0;
|
|
*size = 0;
|
|
#elif SANITIZER_SOLARIS
|
|
// FIXME
|
|
*addr = 0;
|
|
*size = 0;
|
|
#else
|
|
# error "Unknown OS"
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
#if !SANITIZER_GO
|
|
uptr GetTlsSize() {
|
|
#if SANITIZER_FREEBSD || SANITIZER_ANDROID || SANITIZER_NETBSD || \
|
|
SANITIZER_OPENBSD || SANITIZER_SOLARIS
|
|
uptr addr, size;
|
|
GetTls(&addr, &size);
|
|
return size;
|
|
#elif defined(__mips__) || defined(__powerpc64__)
|
|
return RoundUpTo(g_tls_size + TlsPreTcbSize(), 16);
|
|
#else
|
|
return g_tls_size;
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
void GetThreadStackAndTls(bool main, uptr *stk_addr, uptr *stk_size,
|
|
uptr *tls_addr, uptr *tls_size) {
|
|
#if SANITIZER_GO
|
|
// Stub implementation for Go.
|
|
*stk_addr = *stk_size = *tls_addr = *tls_size = 0;
|
|
#else
|
|
GetTls(tls_addr, tls_size);
|
|
|
|
uptr stack_top, stack_bottom;
|
|
GetThreadStackTopAndBottom(main, &stack_top, &stack_bottom);
|
|
*stk_addr = stack_bottom;
|
|
*stk_size = stack_top - stack_bottom;
|
|
|
|
if (!main) {
|
|
// If stack and tls intersect, make them non-intersecting.
|
|
if (*tls_addr > *stk_addr && *tls_addr < *stk_addr + *stk_size) {
|
|
CHECK_GT(*tls_addr + *tls_size, *stk_addr);
|
|
CHECK_LE(*tls_addr + *tls_size, *stk_addr + *stk_size);
|
|
*stk_size -= *tls_size;
|
|
*tls_addr = *stk_addr + *stk_size;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#if !SANITIZER_FREEBSD && !SANITIZER_OPENBSD
|
|
typedef ElfW(Phdr) Elf_Phdr;
|
|
#elif SANITIZER_WORDSIZE == 32 && __FreeBSD_version <= 902001 // v9.2
|
|
#define Elf_Phdr XElf32_Phdr
|
|
#define dl_phdr_info xdl_phdr_info
|
|
#define dl_iterate_phdr(c, b) xdl_iterate_phdr((c), (b))
|
|
#endif // !SANITIZER_FREEBSD && !SANITIZER_OPENBSD
|
|
|
|
struct DlIteratePhdrData {
|
|
InternalMmapVectorNoCtor<LoadedModule> *modules;
|
|
bool first;
|
|
};
|
|
|
|
static int dl_iterate_phdr_cb(dl_phdr_info *info, size_t size, void *arg) {
|
|
DlIteratePhdrData *data = (DlIteratePhdrData*)arg;
|
|
InternalScopedString module_name(kMaxPathLength);
|
|
if (data->first) {
|
|
data->first = false;
|
|
// First module is the binary itself.
|
|
ReadBinaryNameCached(module_name.data(), module_name.size());
|
|
} else if (info->dlpi_name) {
|
|
module_name.append("%s", info->dlpi_name);
|
|
}
|
|
if (module_name[0] == '\0')
|
|
return 0;
|
|
LoadedModule cur_module;
|
|
cur_module.set(module_name.data(), info->dlpi_addr);
|
|
for (int i = 0; i < (int)info->dlpi_phnum; i++) {
|
|
const Elf_Phdr *phdr = &info->dlpi_phdr[i];
|
|
if (phdr->p_type == PT_LOAD) {
|
|
uptr cur_beg = info->dlpi_addr + phdr->p_vaddr;
|
|
uptr cur_end = cur_beg + phdr->p_memsz;
|
|
bool executable = phdr->p_flags & PF_X;
|
|
bool writable = phdr->p_flags & PF_W;
|
|
cur_module.addAddressRange(cur_beg, cur_end, executable,
|
|
writable);
|
|
}
|
|
}
|
|
data->modules->push_back(cur_module);
|
|
return 0;
|
|
}
|
|
|
|
#if SANITIZER_ANDROID && __ANDROID_API__ < 21
|
|
extern "C" __attribute__((weak)) int dl_iterate_phdr(
|
|
int (*)(struct dl_phdr_info *, size_t, void *), void *);
|
|
#endif
|
|
|
|
static bool requiresProcmaps() {
|
|
#if SANITIZER_ANDROID && __ANDROID_API__ <= 22
|
|
// Fall back to /proc/maps if dl_iterate_phdr is unavailable or broken.
|
|
// The runtime check allows the same library to work with
|
|
// both K and L (and future) Android releases.
|
|
return AndroidGetApiLevel() <= ANDROID_LOLLIPOP_MR1;
|
|
#else
|
|
return false;
|
|
#endif
|
|
}
|
|
|
|
static void procmapsInit(InternalMmapVectorNoCtor<LoadedModule> *modules) {
|
|
MemoryMappingLayout memory_mapping(/*cache_enabled*/true);
|
|
memory_mapping.DumpListOfModules(modules);
|
|
}
|
|
|
|
void ListOfModules::init() {
|
|
clearOrInit();
|
|
if (requiresProcmaps()) {
|
|
procmapsInit(&modules_);
|
|
} else {
|
|
DlIteratePhdrData data = {&modules_, true};
|
|
dl_iterate_phdr(dl_iterate_phdr_cb, &data);
|
|
}
|
|
}
|
|
|
|
// When a custom loader is used, dl_iterate_phdr may not contain the full
|
|
// list of modules. Allow callers to fall back to using procmaps.
|
|
void ListOfModules::fallbackInit() {
|
|
if (!requiresProcmaps()) {
|
|
clearOrInit();
|
|
procmapsInit(&modules_);
|
|
} else {
|
|
clear();
|
|
}
|
|
}
|
|
|
|
// getrusage does not give us the current RSS, only the max RSS.
|
|
// Still, this is better than nothing if /proc/self/statm is not available
|
|
// for some reason, e.g. due to a sandbox.
|
|
static uptr GetRSSFromGetrusage() {
|
|
struct rusage usage;
|
|
if (getrusage(RUSAGE_SELF, &usage)) // Failed, probably due to a sandbox.
|
|
return 0;
|
|
return usage.ru_maxrss << 10; // ru_maxrss is in Kb.
|
|
}
|
|
|
|
uptr GetRSS() {
|
|
if (!common_flags()->can_use_proc_maps_statm)
|
|
return GetRSSFromGetrusage();
|
|
fd_t fd = OpenFile("/proc/self/statm", RdOnly);
|
|
if (fd == kInvalidFd)
|
|
return GetRSSFromGetrusage();
|
|
char buf[64];
|
|
uptr len = internal_read(fd, buf, sizeof(buf) - 1);
|
|
internal_close(fd);
|
|
if ((sptr)len <= 0)
|
|
return 0;
|
|
buf[len] = 0;
|
|
// The format of the file is:
|
|
// 1084 89 69 11 0 79 0
|
|
// We need the second number which is RSS in pages.
|
|
char *pos = buf;
|
|
// Skip the first number.
|
|
while (*pos >= '0' && *pos <= '9')
|
|
pos++;
|
|
// Skip whitespaces.
|
|
while (!(*pos >= '0' && *pos <= '9') && *pos != 0)
|
|
pos++;
|
|
// Read the number.
|
|
uptr rss = 0;
|
|
while (*pos >= '0' && *pos <= '9')
|
|
rss = rss * 10 + *pos++ - '0';
|
|
return rss * GetPageSizeCached();
|
|
}
|
|
|
|
// sysconf(_SC_NPROCESSORS_{CONF,ONLN}) cannot be used on most platforms as
|
|
// they allocate memory.
|
|
u32 GetNumberOfCPUs() {
|
|
#if SANITIZER_FREEBSD || SANITIZER_NETBSD || SANITIZER_OPENBSD
|
|
u32 ncpu;
|
|
int req[2];
|
|
uptr len = sizeof(ncpu);
|
|
req[0] = CTL_HW;
|
|
req[1] = HW_NCPU;
|
|
CHECK_EQ(internal_sysctl(req, 2, &ncpu, &len, NULL, 0), 0);
|
|
return ncpu;
|
|
#elif SANITIZER_ANDROID && !defined(CPU_COUNT) && !defined(__aarch64__)
|
|
// Fall back to /sys/devices/system/cpu on Android when cpu_set_t doesn't
|
|
// exist in sched.h. That is the case for toolchains generated with older
|
|
// NDKs.
|
|
// This code doesn't work on AArch64 because internal_getdents makes use of
|
|
// the 64bit getdents syscall, but cpu_set_t seems to always exist on AArch64.
|
|
uptr fd = internal_open("/sys/devices/system/cpu", O_RDONLY | O_DIRECTORY);
|
|
if (internal_iserror(fd))
|
|
return 0;
|
|
InternalMmapVector<u8> buffer(4096);
|
|
uptr bytes_read = buffer.size();
|
|
uptr n_cpus = 0;
|
|
u8 *d_type;
|
|
struct linux_dirent *entry = (struct linux_dirent *)&buffer[bytes_read];
|
|
while (true) {
|
|
if ((u8 *)entry >= &buffer[bytes_read]) {
|
|
bytes_read = internal_getdents(fd, (struct linux_dirent *)buffer.data(),
|
|
buffer.size());
|
|
if (internal_iserror(bytes_read) || !bytes_read)
|
|
break;
|
|
entry = (struct linux_dirent *)buffer.data();
|
|
}
|
|
d_type = (u8 *)entry + entry->d_reclen - 1;
|
|
if (d_type >= &buffer[bytes_read] ||
|
|
(u8 *)&entry->d_name[3] >= &buffer[bytes_read])
|
|
break;
|
|
if (entry->d_ino != 0 && *d_type == DT_DIR) {
|
|
if (entry->d_name[0] == 'c' && entry->d_name[1] == 'p' &&
|
|
entry->d_name[2] == 'u' &&
|
|
entry->d_name[3] >= '0' && entry->d_name[3] <= '9')
|
|
n_cpus++;
|
|
}
|
|
entry = (struct linux_dirent *)(((u8 *)entry) + entry->d_reclen);
|
|
}
|
|
internal_close(fd);
|
|
return n_cpus;
|
|
#elif SANITIZER_SOLARIS
|
|
return sysconf(_SC_NPROCESSORS_ONLN);
|
|
#else
|
|
cpu_set_t CPUs;
|
|
CHECK_EQ(sched_getaffinity(0, sizeof(cpu_set_t), &CPUs), 0);
|
|
return CPU_COUNT(&CPUs);
|
|
#endif
|
|
}
|
|
|
|
#if SANITIZER_LINUX
|
|
|
|
# if SANITIZER_ANDROID
|
|
static atomic_uint8_t android_log_initialized;
|
|
|
|
void AndroidLogInit() {
|
|
openlog(GetProcessName(), 0, LOG_USER);
|
|
atomic_store(&android_log_initialized, 1, memory_order_release);
|
|
}
|
|
|
|
static bool ShouldLogAfterPrintf() {
|
|
return atomic_load(&android_log_initialized, memory_order_acquire);
|
|
}
|
|
|
|
extern "C" SANITIZER_WEAK_ATTRIBUTE
|
|
int async_safe_write_log(int pri, const char* tag, const char* msg);
|
|
extern "C" SANITIZER_WEAK_ATTRIBUTE
|
|
int __android_log_write(int prio, const char* tag, const char* msg);
|
|
|
|
// ANDROID_LOG_INFO is 4, but can't be resolved at runtime.
|
|
#define SANITIZER_ANDROID_LOG_INFO 4
|
|
|
|
// async_safe_write_log is a new public version of __libc_write_log that is
|
|
// used behind syslog. It is preferable to syslog as it will not do any dynamic
|
|
// memory allocation or formatting.
|
|
// If the function is not available, syslog is preferred for L+ (it was broken
|
|
// pre-L) as __android_log_write triggers a racey behavior with the strncpy
|
|
// interceptor. Fallback to __android_log_write pre-L.
|
|
void WriteOneLineToSyslog(const char *s) {
|
|
if (&async_safe_write_log) {
|
|
async_safe_write_log(SANITIZER_ANDROID_LOG_INFO, GetProcessName(), s);
|
|
} else if (AndroidGetApiLevel() > ANDROID_KITKAT) {
|
|
syslog(LOG_INFO, "%s", s);
|
|
} else {
|
|
CHECK(&__android_log_write);
|
|
__android_log_write(SANITIZER_ANDROID_LOG_INFO, nullptr, s);
|
|
}
|
|
}
|
|
|
|
extern "C" SANITIZER_WEAK_ATTRIBUTE
|
|
void android_set_abort_message(const char *);
|
|
|
|
void SetAbortMessage(const char *str) {
|
|
if (&android_set_abort_message)
|
|
android_set_abort_message(str);
|
|
}
|
|
# else
|
|
void AndroidLogInit() {}
|
|
|
|
static bool ShouldLogAfterPrintf() { return true; }
|
|
|
|
void WriteOneLineToSyslog(const char *s) { syslog(LOG_INFO, "%s", s); }
|
|
|
|
void SetAbortMessage(const char *str) {}
|
|
# endif // SANITIZER_ANDROID
|
|
|
|
void LogMessageOnPrintf(const char *str) {
|
|
if (common_flags()->log_to_syslog && ShouldLogAfterPrintf())
|
|
WriteToSyslog(str);
|
|
}
|
|
|
|
#endif // SANITIZER_LINUX
|
|
|
|
#if SANITIZER_LINUX && !SANITIZER_GO
|
|
// glibc crashes when using clock_gettime from a preinit_array function as the
|
|
// vDSO function pointers haven't been initialized yet. __progname is
|
|
// initialized after the vDSO function pointers, so if it exists, is not null
|
|
// and is not empty, we can use clock_gettime.
|
|
extern "C" SANITIZER_WEAK_ATTRIBUTE char *__progname;
|
|
INLINE bool CanUseVDSO() {
|
|
// Bionic is safe, it checks for the vDSO function pointers to be initialized.
|
|
if (SANITIZER_ANDROID)
|
|
return true;
|
|
if (&__progname && __progname && *__progname)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
// MonotonicNanoTime is a timing function that can leverage the vDSO by calling
|
|
// clock_gettime. real_clock_gettime only exists if clock_gettime is
|
|
// intercepted, so define it weakly and use it if available.
|
|
extern "C" SANITIZER_WEAK_ATTRIBUTE
|
|
int real_clock_gettime(u32 clk_id, void *tp);
|
|
u64 MonotonicNanoTime() {
|
|
timespec ts;
|
|
if (CanUseVDSO()) {
|
|
if (&real_clock_gettime)
|
|
real_clock_gettime(CLOCK_MONOTONIC, &ts);
|
|
else
|
|
clock_gettime(CLOCK_MONOTONIC, &ts);
|
|
} else {
|
|
internal_clock_gettime(CLOCK_MONOTONIC, &ts);
|
|
}
|
|
return (u64)ts.tv_sec * (1000ULL * 1000 * 1000) + ts.tv_nsec;
|
|
}
|
|
#else
|
|
// Non-Linux & Go always use the syscall.
|
|
u64 MonotonicNanoTime() {
|
|
timespec ts;
|
|
internal_clock_gettime(CLOCK_MONOTONIC, &ts);
|
|
return (u64)ts.tv_sec * (1000ULL * 1000 * 1000) + ts.tv_nsec;
|
|
}
|
|
#endif // SANITIZER_LINUX && !SANITIZER_GO
|
|
|
|
#if !SANITIZER_OPENBSD
|
|
void ReExec() {
|
|
const char *pathname = "/proc/self/exe";
|
|
|
|
#if SANITIZER_NETBSD
|
|
static const int name[] = {
|
|
CTL_KERN,
|
|
KERN_PROC_ARGS,
|
|
-1,
|
|
KERN_PROC_PATHNAME,
|
|
};
|
|
char path[400];
|
|
uptr len;
|
|
|
|
len = sizeof(path);
|
|
if (internal_sysctl(name, ARRAY_SIZE(name), path, &len, NULL, 0) != -1)
|
|
pathname = path;
|
|
#elif SANITIZER_SOLARIS
|
|
pathname = getexecname();
|
|
CHECK_NE(pathname, NULL);
|
|
#elif SANITIZER_USE_GETAUXVAL
|
|
// Calling execve with /proc/self/exe sets that as $EXEC_ORIGIN. Binaries that
|
|
// rely on that will fail to load shared libraries. Query AT_EXECFN instead.
|
|
pathname = reinterpret_cast<const char *>(getauxval(AT_EXECFN));
|
|
#endif
|
|
|
|
uptr rv = internal_execve(pathname, GetArgv(), GetEnviron());
|
|
int rverrno;
|
|
CHECK_EQ(internal_iserror(rv, &rverrno), true);
|
|
Printf("execve failed, errno %d\n", rverrno);
|
|
Die();
|
|
}
|
|
#endif // !SANITIZER_OPENBSD
|
|
|
|
} // namespace __sanitizer
|
|
|
|
#endif
|