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Annotate PageAllocator for MSan.

Browse source 
PageAllocator maps memory via sys_mmap(), implemented in
linux_syscall_support.h. We need to explicitly inform MSan that this memory is
initialized.

Patch by Sergey Matveev <earthdok@chromium.org>

BUG=chromium:394028

Review URL: https://breakpad.appspot.com/2744002/


git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1356 4c0a9323-5329-0410-9bdc-e9ce6186880e
This commit is contained in:
mark@chromium.org 2014-07-22 14:24:21 +00:00
parent 561f818735
commit c41b7fc414
1 changed files with 10 additions and 0 deletions
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10
src/common/memory.h
View file

@ -38,6 +38,10 @@
#include <memory> #include <memory>
#include <vector> #include <vector>
#if defined(MEMORY_SANITIZER)
#include <sanitizer/msan_interface.h>
#endif
#ifdef __APPLE__ #ifdef __APPLE__
#define sys_mmap mmap #define sys_mmap mmap
#define sys_mmap2 mmap #define sys_mmap2 mmap
@ -120,6 +124,12 @@ class PageAllocator {
if (a == MAP_FAILED) if (a == MAP_FAILED)
return NULL; return NULL;
#if defined(MEMORY_SANITIZER)
// We need to indicate to MSan that memory allocated through sys_mmap is
// initialized, since linux_syscall_support.h doesn't have MSan hooks.
__msan_unpoison(a, page_size_ * num_pages);
#endif
struct PageHeader *header = reinterpret_cast<PageHeader*>(a); struct PageHeader *header = reinterpret_cast<PageHeader*>(a);
header->next = last_; header->next = last_;
header->num_pages = num_pages; header->num_pages = num_pages;