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132 lines (110 loc) · 4.25 KB
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/*
* Copyright (C) 2014, 2015 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "Sizes.h"
#include "Zone.h"
namespace bmalloc {
template<typename T> static void remoteRead(task_t task, memory_reader_t reader, vm_address_t remotePointer, T& result)
{
void* tmp = nullptr;
kern_return_t error = reader(task, remotePointer, sizeof(T), &tmp);
// This read sometimes fails for unknown reasons (<rdar://problem/14093757>).
// Avoid a crash by skipping the memcpy when this happens.
if (error || !tmp) {
fprintf(stderr, "bmalloc: error reading remote process: 0x%x\n", error);
return;
}
memcpy(&result, tmp, sizeof(T));
}
// These function pointers are invoked unconditionally on all zones by various
// system tools. We don't support any of these features, but we provide
// just enough functionality not to crash.
static size_t good_size(malloc_zone_t*, size_t size)
{
return size;
}
static boolean_t check(malloc_zone_t*)
{
return true;
}
static void print(malloc_zone_t*, boolean_t)
{
}
static void log(malloc_zone_t*, void*)
{
}
static void force_lock(malloc_zone_t*)
{
}
static void force_unlock(malloc_zone_t*)
{
}
static void statistics(malloc_zone_t*, malloc_statistics_t* statistics)
{
memset(statistics, 0, sizeof(malloc_statistics_t));
}
static size_t zoneSize(malloc_zone_t*, const void*)
{
// Our zone is not public API, so no pointer can belong to us.
return 0;
}
// This function runs inside the leaks process.
static kern_return_t enumerator(task_t task, void* context, unsigned type_mask, vm_address_t zone_address, memory_reader_t reader, vm_range_recorder_t recorder)
{
Zone remoteZone(task, reader, zone_address);
for (auto* chunk : remoteZone.chunks()) {
vm_range_t range = { reinterpret_cast<vm_address_t>(chunk), chunkSize };
if ((type_mask & MALLOC_PTR_REGION_RANGE_TYPE))
(*recorder)(task, context, MALLOC_PTR_REGION_RANGE_TYPE, &range, 1);
if ((type_mask & MALLOC_PTR_IN_USE_RANGE_TYPE))
(*recorder)(task, context, MALLOC_PTR_IN_USE_RANGE_TYPE, &range, 1);
}
return 0;
}
// The memory analysis API requires the contents of this struct to be a static
// constant in the program binary. The leaks process will load this struct
// out of the program binary (and not out of the running process).
static malloc_introspection_t zoneIntrospect = {
.enumerator = bmalloc::enumerator,
.good_size = bmalloc::good_size,
.check = bmalloc::check,
.print = bmalloc::print,
.log = bmalloc::log,
.force_lock = bmalloc::force_lock,
.force_unlock = bmalloc::force_unlock,
.statistics = bmalloc::statistics
};
Zone::Zone()
{
malloc_zone_t::size = &bmalloc::zoneSize;
malloc_zone_t::zone_name = "WebKit Malloc";
malloc_zone_t::introspect = &bmalloc::zoneIntrospect;
malloc_zone_t::version = 4;
malloc_zone_register(this);
}
Zone::Zone(task_t task, memory_reader_t reader, vm_address_t remotePointer)
{
remoteRead(task, reader, remotePointer, *this);
}
} // namespace bmalloc