forked from OSchip/llvm-project
300 lines
10 KiB
C++
300 lines
10 KiB
C++
//===-- asan_mac.cpp ------------------------------------------------------===//
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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 a part of AddressSanitizer, an address sanity checker.
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//
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// Mac-specific details.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_platform.h"
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#if SANITIZER_MAC
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#include "asan_interceptors.h"
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#include "asan_internal.h"
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#include "asan_mapping.h"
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#include "asan_stack.h"
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#include "asan_thread.h"
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#include "sanitizer_common/sanitizer_atomic.h"
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#include "sanitizer_common/sanitizer_libc.h"
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#include "sanitizer_common/sanitizer_mac.h"
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#include <dlfcn.h>
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#include <fcntl.h>
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#include <libkern/OSAtomic.h>
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#include <mach-o/dyld.h>
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#include <mach-o/getsect.h>
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#include <mach-o/loader.h>
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#include <pthread.h>
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#include <stdlib.h> // for free()
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#include <sys/mman.h>
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#include <sys/resource.h>
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#include <sys/sysctl.h>
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#include <sys/ucontext.h>
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#include <unistd.h>
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// from <crt_externs.h>, but we don't have that file on iOS
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extern "C" {
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extern char ***_NSGetArgv(void);
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extern char ***_NSGetEnviron(void);
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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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// No-op. Mac does not support static linkage anyway.
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void *AsanDoesNotSupportStaticLinkage() {
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return 0;
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}
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uptr FindDynamicShadowStart() {
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return MapDynamicShadow(MemToShadowSize(kHighMemEnd), ASAN_SHADOW_SCALE,
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/*min_shadow_base_alignment*/ 0, kHighMemEnd);
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}
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// No-op. Mac does not support static linkage anyway.
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void AsanCheckDynamicRTPrereqs() {}
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// No-op. Mac does not support static linkage anyway.
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void AsanCheckIncompatibleRT() {}
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void AsanApplyToGlobals(globals_op_fptr op, const void *needle) {
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// Find the Mach-O header for the image containing the needle
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Dl_info info;
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int err = dladdr(needle, &info);
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if (err == 0) return;
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#if __LP64__
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const struct mach_header_64 *mh = (struct mach_header_64 *)info.dli_fbase;
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#else
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const struct mach_header *mh = (struct mach_header *)info.dli_fbase;
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#endif
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// Look up the __asan_globals section in that image and register its globals
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unsigned long size = 0;
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__asan_global *globals = (__asan_global *)getsectiondata(
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mh,
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"__DATA", "__asan_globals",
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&size);
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if (!globals) return;
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if (size % sizeof(__asan_global) != 0) return;
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op(globals, size / sizeof(__asan_global));
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}
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void FlushUnneededASanShadowMemory(uptr p, uptr size) {
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// Since asan's mapping is compacting, the shadow chunk may be
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// not page-aligned, so we only flush the page-aligned portion.
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ReleaseMemoryPagesToOS(MemToShadow(p), MemToShadow(p + size));
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}
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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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// Support for the following functions from libdispatch on Mac OS:
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// dispatch_async_f()
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// dispatch_async()
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// dispatch_sync_f()
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// dispatch_sync()
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// dispatch_after_f()
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// dispatch_after()
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// dispatch_group_async_f()
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// dispatch_group_async()
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// TODO(glider): libdispatch API contains other functions that we don't support
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// yet.
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//
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// dispatch_sync() and dispatch_sync_f() are synchronous, although chances are
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// they can cause jobs to run on a thread different from the current one.
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// TODO(glider): if so, we need a test for this (otherwise we should remove
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// them).
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//
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// The following functions use dispatch_barrier_async_f() (which isn't a library
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// function but is exported) and are thus supported:
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// dispatch_source_set_cancel_handler_f()
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// dispatch_source_set_cancel_handler()
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// dispatch_source_set_event_handler_f()
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// dispatch_source_set_event_handler()
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//
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// The reference manual for Grand Central Dispatch is available at
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// http://developer.apple.com/library/mac/#documentation/Performance/Reference/GCD_libdispatch_Ref/Reference/reference.html
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// The implementation details are at
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// http://libdispatch.macosforge.org/trac/browser/trunk/src/queue.c
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typedef void* dispatch_group_t;
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typedef void* dispatch_queue_t;
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typedef void* dispatch_source_t;
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typedef u64 dispatch_time_t;
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typedef void (*dispatch_function_t)(void *block);
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typedef void* (*worker_t)(void *block);
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// A wrapper for the ObjC blocks used to support libdispatch.
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typedef struct {
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void *block;
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dispatch_function_t func;
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u32 parent_tid;
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} asan_block_context_t;
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ALWAYS_INLINE
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void asan_register_worker_thread(int parent_tid, StackTrace *stack) {
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AsanThread *t = GetCurrentThread();
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if (!t) {
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t = AsanThread::Create(/* start_routine */ nullptr, /* arg */ nullptr,
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parent_tid, stack, /* detached */ true);
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t->Init();
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asanThreadRegistry().StartThread(t->tid(), GetTid(), ThreadType::Worker,
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nullptr);
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SetCurrentThread(t);
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}
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}
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// For use by only those functions that allocated the context via
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// alloc_asan_context().
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extern "C"
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void asan_dispatch_call_block_and_release(void *block) {
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GET_STACK_TRACE_THREAD;
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asan_block_context_t *context = (asan_block_context_t*)block;
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VReport(2,
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"asan_dispatch_call_block_and_release(): "
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"context: %p, pthread_self: %p\n",
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block, pthread_self());
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asan_register_worker_thread(context->parent_tid, &stack);
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// Call the original dispatcher for the block.
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context->func(context->block);
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asan_free(context, &stack, FROM_MALLOC);
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}
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} // namespace __asan
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using namespace __asan;
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// Wrap |ctxt| and |func| into an asan_block_context_t.
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// The caller retains control of the allocated context.
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extern "C"
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asan_block_context_t *alloc_asan_context(void *ctxt, dispatch_function_t func,
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BufferedStackTrace *stack) {
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asan_block_context_t *asan_ctxt =
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(asan_block_context_t*) asan_malloc(sizeof(asan_block_context_t), stack);
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asan_ctxt->block = ctxt;
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asan_ctxt->func = func;
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asan_ctxt->parent_tid = GetCurrentTidOrInvalid();
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return asan_ctxt;
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}
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// Define interceptor for dispatch_*_f function with the three most common
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// parameters: dispatch_queue_t, context, dispatch_function_t.
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#define INTERCEPT_DISPATCH_X_F_3(dispatch_x_f) \
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INTERCEPTOR(void, dispatch_x_f, dispatch_queue_t dq, void *ctxt, \
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dispatch_function_t func) { \
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GET_STACK_TRACE_THREAD; \
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asan_block_context_t *asan_ctxt = alloc_asan_context(ctxt, func, &stack); \
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if (Verbosity() >= 2) { \
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Report(#dispatch_x_f "(): context: %p, pthread_self: %p\n", \
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asan_ctxt, pthread_self()); \
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PRINT_CURRENT_STACK(); \
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} \
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return REAL(dispatch_x_f)(dq, (void*)asan_ctxt, \
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asan_dispatch_call_block_and_release); \
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}
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INTERCEPT_DISPATCH_X_F_3(dispatch_async_f)
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INTERCEPT_DISPATCH_X_F_3(dispatch_sync_f)
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INTERCEPT_DISPATCH_X_F_3(dispatch_barrier_async_f)
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INTERCEPTOR(void, dispatch_after_f, dispatch_time_t when,
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dispatch_queue_t dq, void *ctxt,
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dispatch_function_t func) {
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GET_STACK_TRACE_THREAD;
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asan_block_context_t *asan_ctxt = alloc_asan_context(ctxt, func, &stack);
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if (Verbosity() >= 2) {
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Report("dispatch_after_f: %p\n", asan_ctxt);
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PRINT_CURRENT_STACK();
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}
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return REAL(dispatch_after_f)(when, dq, (void*)asan_ctxt,
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asan_dispatch_call_block_and_release);
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}
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INTERCEPTOR(void, dispatch_group_async_f, dispatch_group_t group,
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dispatch_queue_t dq, void *ctxt,
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dispatch_function_t func) {
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GET_STACK_TRACE_THREAD;
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asan_block_context_t *asan_ctxt = alloc_asan_context(ctxt, func, &stack);
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if (Verbosity() >= 2) {
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Report("dispatch_group_async_f(): context: %p, pthread_self: %p\n",
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asan_ctxt, pthread_self());
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PRINT_CURRENT_STACK();
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}
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REAL(dispatch_group_async_f)(group, dq, (void*)asan_ctxt,
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asan_dispatch_call_block_and_release);
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}
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#if !defined(MISSING_BLOCKS_SUPPORT)
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extern "C" {
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void dispatch_async(dispatch_queue_t dq, void(^work)(void));
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void dispatch_group_async(dispatch_group_t dg, dispatch_queue_t dq,
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void(^work)(void));
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void dispatch_after(dispatch_time_t when, dispatch_queue_t queue,
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void(^work)(void));
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void dispatch_source_set_cancel_handler(dispatch_source_t ds,
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void(^work)(void));
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void dispatch_source_set_event_handler(dispatch_source_t ds, void(^work)(void));
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}
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#define GET_ASAN_BLOCK(work) \
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void (^asan_block)(void); \
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int parent_tid = GetCurrentTidOrInvalid(); \
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asan_block = ^(void) { \
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GET_STACK_TRACE_THREAD; \
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asan_register_worker_thread(parent_tid, &stack); \
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work(); \
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}
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INTERCEPTOR(void, dispatch_async,
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dispatch_queue_t dq, void(^work)(void)) {
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ENABLE_FRAME_POINTER;
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GET_ASAN_BLOCK(work);
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REAL(dispatch_async)(dq, asan_block);
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}
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INTERCEPTOR(void, dispatch_group_async,
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dispatch_group_t dg, dispatch_queue_t dq, void(^work)(void)) {
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ENABLE_FRAME_POINTER;
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GET_ASAN_BLOCK(work);
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REAL(dispatch_group_async)(dg, dq, asan_block);
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}
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INTERCEPTOR(void, dispatch_after,
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dispatch_time_t when, dispatch_queue_t queue, void(^work)(void)) {
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ENABLE_FRAME_POINTER;
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GET_ASAN_BLOCK(work);
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REAL(dispatch_after)(when, queue, asan_block);
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}
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INTERCEPTOR(void, dispatch_source_set_cancel_handler,
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dispatch_source_t ds, void(^work)(void)) {
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if (!work) {
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REAL(dispatch_source_set_cancel_handler)(ds, work);
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return;
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}
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ENABLE_FRAME_POINTER;
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GET_ASAN_BLOCK(work);
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REAL(dispatch_source_set_cancel_handler)(ds, asan_block);
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}
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INTERCEPTOR(void, dispatch_source_set_event_handler,
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dispatch_source_t ds, void(^work)(void)) {
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ENABLE_FRAME_POINTER;
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GET_ASAN_BLOCK(work);
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REAL(dispatch_source_set_event_handler)(ds, asan_block);
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}
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#endif
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#endif // SANITIZER_MAC
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