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Label pages mapped by linker_allocator

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(cherry picked from commit 51a22a12ab)

Bug: 17013324
Change-Id: I345c9d0fecc29d3626c5be01cc3c0ed1583ac361
This commit is contained in:
Dmitriy Ivanov 2014-08-08 16:57:15 -07:00
parent 8a84d383fb
commit 4bea4c631f
3 changed files with 32 additions and 5 deletions
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6
libc/bionic/dlmalloc.c
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@ -16,6 +16,7 @@
#include "dlmalloc.h" #include "dlmalloc.h"
#include "private/bionic_prctl.h"
#include "private/libc_logging.h" #include "private/libc_logging.h"
// Send dlmalloc errors to the log. // Send dlmalloc errors to the log.
@ -30,11 +31,6 @@ static void* named_anonymous_mmap(size_t length);
#define MMAP(s) named_anonymous_mmap(s) #define MMAP(s) named_anonymous_mmap(s)
#define DIRECT_MMAP(s) named_anonymous_mmap(s) #define DIRECT_MMAP(s) named_anonymous_mmap(s)
// Local definitions of custom prctl arguments to set a vma name in Android kernels.
#include <sys/prctl.h>
#define PR_SET_VMA 0x53564d41
#define PR_SET_VMA_ANON_NAME 0
// Ugly inclusion of C file so that bionic specific #defines configure dlmalloc. // Ugly inclusion of C file so that bionic specific #defines configure dlmalloc.
#include "../upstream-dlmalloc/malloc.c" #include "../upstream-dlmalloc/malloc.c"

26
libc/private/bionic_prctl.h Normal file
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@ -0,0 +1,26 @@
/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef BIONIC_PRCTL_H
#define BIONIC_PRCTL_H
#include <sys/prctl.h>
// This is only supported by Android kernels, so it's not in the uapi headers.
#define PR_SET_VMA 0x53564d41
#define PR_SET_VMA_ANON_NAME 0
#endif // BIONIC_PRCTL_H

5
linker/linker_allocator.cpp
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@ -18,6 +18,8 @@
#include <sys/mman.h> #include <sys/mman.h>
#include <unistd.h> #include <unistd.h>
#include "private/bionic_prctl.h"
struct LinkerAllocatorPage { struct LinkerAllocatorPage {
LinkerAllocatorPage* next; LinkerAllocatorPage* next;
uint8_t bytes[PAGE_SIZE-sizeof(LinkerAllocatorPage*)]; uint8_t bytes[PAGE_SIZE-sizeof(LinkerAllocatorPage*)];
@ -96,6 +98,9 @@ void LinkerBlockAllocator::create_new_page() {
if (page == MAP_FAILED) { if (page == MAP_FAILED) {
abort(); // oom abort(); // oom
} }
prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, page, PAGE_SIZE, "linker_alloc");
memset(page, 0, PAGE_SIZE); memset(page, 0, PAGE_SIZE);
FreeBlockInfo* first_block = reinterpret_cast<FreeBlockInfo*>(page->bytes); FreeBlockInfo* first_block = reinterpret_cast<FreeBlockInfo*>(page->bytes);