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-rw-r--r--lib/asan/asan_mac.cc332
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diff --git a/lib/asan/asan_mac.cc b/lib/asan/asan_mac.cc
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--- a/lib/asan/asan_mac.cc
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-//===-- asan_mac.cc -------------------------------------------------------===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file is a part of AddressSanitizer, an address sanity checker.
-//
-// Mac-specific details.
-//===----------------------------------------------------------------------===//
-
-#include "sanitizer_common/sanitizer_platform.h"
-#if SANITIZER_MAC
-
-#include "asan_interceptors.h"
-#include "asan_internal.h"
-#include "asan_mapping.h"
-#include "asan_stack.h"
-#include "asan_thread.h"
-#include "sanitizer_common/sanitizer_atomic.h"
-#include "sanitizer_common/sanitizer_libc.h"
-#include "sanitizer_common/sanitizer_mac.h"
-
-#include <dlfcn.h>
-#include <fcntl.h>
-#include <libkern/OSAtomic.h>
-#include <mach-o/dyld.h>
-#include <mach-o/getsect.h>
-#include <mach-o/loader.h>
-#include <pthread.h>
-#include <stdlib.h> // for free()
-#include <sys/mman.h>
-#include <sys/resource.h>
-#include <sys/sysctl.h>
-#include <sys/ucontext.h>
-#include <unistd.h>
-
-// from <crt_externs.h>, but we don't have that file on iOS
-extern "C" {
- extern char ***_NSGetArgv(void);
- extern char ***_NSGetEnviron(void);
-}
-
-namespace __asan {
-
-void InitializePlatformInterceptors() {}
-void InitializePlatformExceptionHandlers() {}
-bool IsSystemHeapAddress (uptr addr) { return false; }
-
-// No-op. Mac does not support static linkage anyway.
-void *AsanDoesNotSupportStaticLinkage() {
- return 0;
-}
-
-uptr FindDynamicShadowStart() {
- uptr granularity = GetMmapGranularity();
- uptr alignment = 8 * granularity;
- uptr left_padding = granularity;
- uptr space_size = kHighShadowEnd + left_padding;
-
- uptr largest_gap_found = 0;
- uptr max_occupied_addr = 0;
- VReport(2, "FindDynamicShadowStart, space_size = %p\n", space_size);
- uptr shadow_start =
- FindAvailableMemoryRange(space_size, alignment, granularity,
- &largest_gap_found, &max_occupied_addr);
- // If the shadow doesn't fit, restrict the address space to make it fit.
- if (shadow_start == 0) {
- VReport(
- 2,
- "Shadow doesn't fit, largest_gap_found = %p, max_occupied_addr = %p\n",
- largest_gap_found, max_occupied_addr);
- uptr new_max_vm = RoundDownTo(largest_gap_found << SHADOW_SCALE, alignment);
- if (new_max_vm < max_occupied_addr) {
- Report("Unable to find a memory range for dynamic shadow.\n");
- Report(
- "space_size = %p, largest_gap_found = %p, max_occupied_addr = %p, "
- "new_max_vm = %p\n",
- space_size, largest_gap_found, max_occupied_addr, new_max_vm);
- CHECK(0 && "cannot place shadow");
- }
- RestrictMemoryToMaxAddress(new_max_vm);
- kHighMemEnd = new_max_vm - 1;
- space_size = kHighShadowEnd + left_padding;
- VReport(2, "FindDynamicShadowStart, space_size = %p\n", space_size);
- shadow_start = FindAvailableMemoryRange(space_size, alignment, granularity,
- nullptr, nullptr);
- if (shadow_start == 0) {
- Report("Unable to find a memory range after restricting VM.\n");
- CHECK(0 && "cannot place shadow after restricting vm");
- }
- }
- CHECK_NE((uptr)0, shadow_start);
- CHECK(IsAligned(shadow_start, alignment));
- return shadow_start;
-}
-
-// No-op. Mac does not support static linkage anyway.
-void AsanCheckDynamicRTPrereqs() {}
-
-// No-op. Mac does not support static linkage anyway.
-void AsanCheckIncompatibleRT() {}
-
-void AsanApplyToGlobals(globals_op_fptr op, const void *needle) {
- // Find the Mach-O header for the image containing the needle
- Dl_info info;
- int err = dladdr(needle, &info);
- if (err == 0) return;
-
-#if __LP64__
- const struct mach_header_64 *mh = (struct mach_header_64 *)info.dli_fbase;
-#else
- const struct mach_header *mh = (struct mach_header *)info.dli_fbase;
-#endif
-
- // Look up the __asan_globals section in that image and register its globals
- unsigned long size = 0;
- __asan_global *globals = (__asan_global *)getsectiondata(
- mh,
- "__DATA", "__asan_globals",
- &size);
-
- if (!globals) return;
- if (size % sizeof(__asan_global) != 0) return;
- op(globals, size / sizeof(__asan_global));
-}
-
-void ReadContextStack(void *context, uptr *stack, uptr *ssize) {
- UNIMPLEMENTED();
-}
-
-// Support for the following functions from libdispatch on Mac OS:
-// dispatch_async_f()
-// dispatch_async()
-// dispatch_sync_f()
-// dispatch_sync()
-// dispatch_after_f()
-// dispatch_after()
-// dispatch_group_async_f()
-// dispatch_group_async()
-// TODO(glider): libdispatch API contains other functions that we don't support
-// yet.
-//
-// dispatch_sync() and dispatch_sync_f() are synchronous, although chances are
-// they can cause jobs to run on a thread different from the current one.
-// TODO(glider): if so, we need a test for this (otherwise we should remove
-// them).
-//
-// The following functions use dispatch_barrier_async_f() (which isn't a library
-// function but is exported) and are thus supported:
-// dispatch_source_set_cancel_handler_f()
-// dispatch_source_set_cancel_handler()
-// dispatch_source_set_event_handler_f()
-// dispatch_source_set_event_handler()
-//
-// The reference manual for Grand Central Dispatch is available at
-// http://developer.apple.com/library/mac/#documentation/Performance/Reference/GCD_libdispatch_Ref/Reference/reference.html
-// The implementation details are at
-// http://libdispatch.macosforge.org/trac/browser/trunk/src/queue.c
-
-typedef void* dispatch_group_t;
-typedef void* dispatch_queue_t;
-typedef void* dispatch_source_t;
-typedef u64 dispatch_time_t;
-typedef void (*dispatch_function_t)(void *block);
-typedef void* (*worker_t)(void *block);
-
-// A wrapper for the ObjC blocks used to support libdispatch.
-typedef struct {
- void *block;
- dispatch_function_t func;
- u32 parent_tid;
-} asan_block_context_t;
-
-ALWAYS_INLINE
-void asan_register_worker_thread(int parent_tid, StackTrace *stack) {
- AsanThread *t = GetCurrentThread();
- if (!t) {
- t = AsanThread::Create(/* start_routine */ nullptr, /* arg */ nullptr,
- parent_tid, stack, /* detached */ true);
- t->Init();
- asanThreadRegistry().StartThread(t->tid(), GetTid(),
- /* workerthread */ true, 0);
- SetCurrentThread(t);
- }
-}
-
-// For use by only those functions that allocated the context via
-// alloc_asan_context().
-extern "C"
-void asan_dispatch_call_block_and_release(void *block) {
- GET_STACK_TRACE_THREAD;
- asan_block_context_t *context = (asan_block_context_t*)block;
- VReport(2,
- "asan_dispatch_call_block_and_release(): "
- "context: %p, pthread_self: %p\n",
- block, pthread_self());
- asan_register_worker_thread(context->parent_tid, &stack);
- // Call the original dispatcher for the block.
- context->func(context->block);
- asan_free(context, &stack, FROM_MALLOC);
-}
-
-} // namespace __asan
-
-using namespace __asan; // NOLINT
-
-// Wrap |ctxt| and |func| into an asan_block_context_t.
-// The caller retains control of the allocated context.
-extern "C"
-asan_block_context_t *alloc_asan_context(void *ctxt, dispatch_function_t func,
- BufferedStackTrace *stack) {
- asan_block_context_t *asan_ctxt =
- (asan_block_context_t*) asan_malloc(sizeof(asan_block_context_t), stack);
- asan_ctxt->block = ctxt;
- asan_ctxt->func = func;
- asan_ctxt->parent_tid = GetCurrentTidOrInvalid();
- return asan_ctxt;
-}
-
-// Define interceptor for dispatch_*_f function with the three most common
-// parameters: dispatch_queue_t, context, dispatch_function_t.
-#define INTERCEPT_DISPATCH_X_F_3(dispatch_x_f) \
- INTERCEPTOR(void, dispatch_x_f, dispatch_queue_t dq, void *ctxt, \
- dispatch_function_t func) { \
- GET_STACK_TRACE_THREAD; \
- asan_block_context_t *asan_ctxt = alloc_asan_context(ctxt, func, &stack); \
- if (Verbosity() >= 2) { \
- Report(#dispatch_x_f "(): context: %p, pthread_self: %p\n", \
- asan_ctxt, pthread_self()); \
- PRINT_CURRENT_STACK(); \
- } \
- return REAL(dispatch_x_f)(dq, (void*)asan_ctxt, \
- asan_dispatch_call_block_and_release); \
- }
-
-INTERCEPT_DISPATCH_X_F_3(dispatch_async_f)
-INTERCEPT_DISPATCH_X_F_3(dispatch_sync_f)
-INTERCEPT_DISPATCH_X_F_3(dispatch_barrier_async_f)
-
-INTERCEPTOR(void, dispatch_after_f, dispatch_time_t when,
- dispatch_queue_t dq, void *ctxt,
- dispatch_function_t func) {
- GET_STACK_TRACE_THREAD;
- asan_block_context_t *asan_ctxt = alloc_asan_context(ctxt, func, &stack);
- if (Verbosity() >= 2) {
- Report("dispatch_after_f: %p\n", asan_ctxt);
- PRINT_CURRENT_STACK();
- }
- return REAL(dispatch_after_f)(when, dq, (void*)asan_ctxt,
- asan_dispatch_call_block_and_release);
-}
-
-INTERCEPTOR(void, dispatch_group_async_f, dispatch_group_t group,
- dispatch_queue_t dq, void *ctxt,
- dispatch_function_t func) {
- GET_STACK_TRACE_THREAD;
- asan_block_context_t *asan_ctxt = alloc_asan_context(ctxt, func, &stack);
- if (Verbosity() >= 2) {
- Report("dispatch_group_async_f(): context: %p, pthread_self: %p\n",
- asan_ctxt, pthread_self());
- PRINT_CURRENT_STACK();
- }
- REAL(dispatch_group_async_f)(group, dq, (void*)asan_ctxt,
- asan_dispatch_call_block_and_release);
-}
-
-#if !defined(MISSING_BLOCKS_SUPPORT)
-extern "C" {
-void dispatch_async(dispatch_queue_t dq, void(^work)(void));
-void dispatch_group_async(dispatch_group_t dg, dispatch_queue_t dq,
- void(^work)(void));
-void dispatch_after(dispatch_time_t when, dispatch_queue_t queue,
- void(^work)(void));
-void dispatch_source_set_cancel_handler(dispatch_source_t ds,
- void(^work)(void));
-void dispatch_source_set_event_handler(dispatch_source_t ds, void(^work)(void));
-}
-
-#define GET_ASAN_BLOCK(work) \
- void (^asan_block)(void); \
- int parent_tid = GetCurrentTidOrInvalid(); \
- asan_block = ^(void) { \
- GET_STACK_TRACE_THREAD; \
- asan_register_worker_thread(parent_tid, &stack); \
- work(); \
- }
-
-INTERCEPTOR(void, dispatch_async,
- dispatch_queue_t dq, void(^work)(void)) {
- ENABLE_FRAME_POINTER;
- GET_ASAN_BLOCK(work);
- REAL(dispatch_async)(dq, asan_block);
-}
-
-INTERCEPTOR(void, dispatch_group_async,
- dispatch_group_t dg, dispatch_queue_t dq, void(^work)(void)) {
- ENABLE_FRAME_POINTER;
- GET_ASAN_BLOCK(work);
- REAL(dispatch_group_async)(dg, dq, asan_block);
-}
-
-INTERCEPTOR(void, dispatch_after,
- dispatch_time_t when, dispatch_queue_t queue, void(^work)(void)) {
- ENABLE_FRAME_POINTER;
- GET_ASAN_BLOCK(work);
- REAL(dispatch_after)(when, queue, asan_block);
-}
-
-INTERCEPTOR(void, dispatch_source_set_cancel_handler,
- dispatch_source_t ds, void(^work)(void)) {
- if (!work) {
- REAL(dispatch_source_set_cancel_handler)(ds, work);
- return;
- }
- ENABLE_FRAME_POINTER;
- GET_ASAN_BLOCK(work);
- REAL(dispatch_source_set_cancel_handler)(ds, asan_block);
-}
-
-INTERCEPTOR(void, dispatch_source_set_event_handler,
- dispatch_source_t ds, void(^work)(void)) {
- ENABLE_FRAME_POINTER;
- GET_ASAN_BLOCK(work);
- REAL(dispatch_source_set_event_handler)(ds, asan_block);
-}
-#endif
-
-#endif // SANITIZER_MAC
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