253 lines
7.2 KiB
C++
253 lines
7.2 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 || SANITIZER_NETBSD || \
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SANITIZER_SOLARIS
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#include "asan_interceptors.h"
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#include "asan_internal.h"
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#include "asan_premap_shadow.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 <limits.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_SOLARIS
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#include <link.h>
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#endif
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#if SANITIZER_ANDROID || SANITIZER_FREEBSD || SANITIZER_SOLARIS
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#include <ucontext.h>
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extern "C" void* _DYNAMIC;
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#elif SANITIZER_NETBSD
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#include <link_elf.h>
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#include <ucontext.h>
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extern Elf_Dyn _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 InitializePlatformExceptionHandlers() {}
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bool IsSystemHeapAddress (uptr addr) { return false; }
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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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static void UnmapFromTo(uptr from, uptr to) {
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CHECK(to >= from);
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if (to == from) return;
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uptr res = internal_munmap(reinterpret_cast<void *>(from), to - from);
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if (UNLIKELY(internal_iserror(res))) {
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Report(
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"ERROR: AddresSanitizer failed to unmap 0x%zx (%zd) bytes at address "
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"%p\n",
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to - from, to - from, from);
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CHECK("unable to unmap" && 0);
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}
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}
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#if ASAN_PREMAP_SHADOW
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uptr FindPremappedShadowStart() {
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uptr granularity = GetMmapGranularity();
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uptr shadow_start = reinterpret_cast<uptr>(&__asan_shadow);
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uptr premap_shadow_size = PremapShadowSize();
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uptr shadow_size = RoundUpTo(kHighShadowEnd, granularity);
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// We may have mapped too much. Release extra memory.
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UnmapFromTo(shadow_start + shadow_size, shadow_start + premap_shadow_size);
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return shadow_start;
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}
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#endif
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uptr FindDynamicShadowStart() {
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#if ASAN_PREMAP_SHADOW
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if (!PremapShadowFailed())
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return FindPremappedShadowStart();
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#endif
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uptr granularity = GetMmapGranularity();
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uptr alignment = granularity * 8;
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uptr left_padding = granularity;
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uptr shadow_size = RoundUpTo(kHighShadowEnd, granularity);
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uptr map_size = shadow_size + left_padding + alignment;
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uptr map_start = (uptr)MmapNoAccess(map_size);
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CHECK_NE(map_start, ~(uptr)0);
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uptr shadow_start = RoundUpTo(map_start + left_padding, alignment);
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UnmapFromTo(map_start, shadow_start - left_padding);
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UnmapFromTo(shadow_start + shadow_size, map_start + map_size);
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return shadow_start;
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}
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void AsanApplyToGlobals(globals_op_fptr op, const void *needle) {
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UNIMPLEMENTED();
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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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VReport(2, "info->dlpi_name = %s\tinfo->dlpi_addr = %p\n",
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info->dlpi_name, info->dlpi_addr);
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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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#if SANITIZER_FREEBSD || SANITIZER_NETBSD
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// Ignore first entry (the main program)
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char **p = (char **)data;
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if (!(*p)) {
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*p = (char *)-1;
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return 0;
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}
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#endif
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#if SANITIZER_SOLARIS
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// Ignore executable on Solaris
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if (info->dlpi_addr == 0)
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return 0;
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#endif
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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 || !flags()->verify_asan_link_order)
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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[PATH_MAX];
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MemoryMappedSegment segment(filename, sizeof(filename));
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while (proc_maps.Next(&segment)) {
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if (IsDynamicRTName(segment.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 || SANITIZER_NETBSD ||
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// SANITIZER_SOLARIS
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