mirror of
https://github.com/autc04/Retro68.git
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178 lines
4.9 KiB
C++
178 lines
4.9 KiB
C++
//===-- asan_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 AddressSanitizer, an address sanity checker.
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//
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// Linux-specific details.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_platform.h"
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#if SANITIZER_FREEBSD || SANITIZER_LINUX
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#include "asan_interceptors.h"
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#include "asan_internal.h"
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#include "asan_thread.h"
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#include "sanitizer_common/sanitizer_flags.h"
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#include "sanitizer_common/sanitizer_freebsd.h"
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#include "sanitizer_common/sanitizer_libc.h"
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#include "sanitizer_common/sanitizer_procmaps.h"
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/mman.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <dlfcn.h>
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#include <fcntl.h>
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#include <pthread.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <unwind.h>
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#if SANITIZER_FREEBSD
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#include <sys/link_elf.h>
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#endif
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#if SANITIZER_ANDROID || SANITIZER_FREEBSD
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#include <ucontext.h>
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extern "C" void* _DYNAMIC;
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#else
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#include <sys/ucontext.h>
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#include <link.h>
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#endif
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// x86-64 FreeBSD 9.2 and older define 'ucontext_t' incorrectly in
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// 32-bit mode.
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#if SANITIZER_FREEBSD && (SANITIZER_WORDSIZE == 32) && \
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__FreeBSD_version <= 902001 // v9.2
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#define ucontext_t xucontext_t
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#endif
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typedef enum {
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ASAN_RT_VERSION_UNDEFINED = 0,
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ASAN_RT_VERSION_DYNAMIC,
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ASAN_RT_VERSION_STATIC,
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} asan_rt_version_t;
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// FIXME: perhaps also store abi version here?
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extern "C" {
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SANITIZER_INTERFACE_ATTRIBUTE
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asan_rt_version_t __asan_rt_version;
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}
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namespace __asan {
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void InitializePlatformInterceptors() {}
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void DisableReexec() {
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// No need to re-exec on Linux.
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}
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void MaybeReexec() {
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// No need to re-exec on Linux.
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}
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void *AsanDoesNotSupportStaticLinkage() {
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// This will fail to link with -static.
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return &_DYNAMIC; // defined in link.h
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}
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#if SANITIZER_ANDROID
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// FIXME: should we do anything for Android?
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void AsanCheckDynamicRTPrereqs() {}
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void AsanCheckIncompatibleRT() {}
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#else
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static int FindFirstDSOCallback(struct dl_phdr_info *info, size_t size,
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void *data) {
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// Continue until the first dynamic library is found
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if (!info->dlpi_name || info->dlpi_name[0] == 0)
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return 0;
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// Ignore vDSO
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if (internal_strncmp(info->dlpi_name, "linux-", sizeof("linux-") - 1) == 0)
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return 0;
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*(const char **)data = info->dlpi_name;
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return 1;
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}
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static bool IsDynamicRTName(const char *libname) {
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return internal_strstr(libname, "libclang_rt.asan") ||
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internal_strstr(libname, "libasan.so");
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}
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static void ReportIncompatibleRT() {
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Report("Your application is linked against incompatible ASan runtimes.\n");
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Die();
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}
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void AsanCheckDynamicRTPrereqs() {
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if (!ASAN_DYNAMIC)
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return;
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// Ensure that dynamic RT is the first DSO in the list
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const char *first_dso_name = nullptr;
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dl_iterate_phdr(FindFirstDSOCallback, &first_dso_name);
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if (first_dso_name && !IsDynamicRTName(first_dso_name)) {
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Report("ASan runtime does not come first in initial library list; "
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"you should either link runtime to your application or "
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"manually preload it with LD_PRELOAD.\n");
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Die();
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}
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}
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void AsanCheckIncompatibleRT() {
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if (ASAN_DYNAMIC) {
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if (__asan_rt_version == ASAN_RT_VERSION_UNDEFINED) {
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__asan_rt_version = ASAN_RT_VERSION_DYNAMIC;
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} else if (__asan_rt_version != ASAN_RT_VERSION_DYNAMIC) {
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ReportIncompatibleRT();
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}
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} else {
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if (__asan_rt_version == ASAN_RT_VERSION_UNDEFINED) {
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// Ensure that dynamic runtime is not present. We should detect it
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// as early as possible, otherwise ASan interceptors could bind to
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// the functions in dynamic ASan runtime instead of the functions in
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// system libraries, causing crashes later in ASan initialization.
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MemoryMappingLayout proc_maps(/*cache_enabled*/true);
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char filename[128];
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while (proc_maps.Next(nullptr, nullptr, nullptr, filename,
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sizeof(filename), nullptr)) {
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if (IsDynamicRTName(filename)) {
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Report("Your application is linked against "
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"incompatible ASan runtimes.\n");
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Die();
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}
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}
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__asan_rt_version = ASAN_RT_VERSION_STATIC;
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} else if (__asan_rt_version != ASAN_RT_VERSION_STATIC) {
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ReportIncompatibleRT();
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}
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}
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}
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#endif // SANITIZER_ANDROID
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#if !SANITIZER_ANDROID
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void ReadContextStack(void *context, uptr *stack, uptr *ssize) {
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ucontext_t *ucp = (ucontext_t*)context;
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*stack = (uptr)ucp->uc_stack.ss_sp;
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*ssize = ucp->uc_stack.ss_size;
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}
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#else
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void ReadContextStack(void *context, uptr *stack, uptr *ssize) {
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UNIMPLEMENTED();
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}
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#endif
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void *AsanDlSymNext(const char *sym) {
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return dlsym(RTLD_NEXT, sym);
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}
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} // namespace __asan
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#endif // SANITIZER_FREEBSD || SANITIZER_LINUX
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