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Bug 1565744. r=kmag,bobowen

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Differential Revision: https://phabricator.services.mozilla.com/D39380

--HG--
extra : moz-landing-system : lando
This commit is contained in:
Jed Davis 2019-08-05 14:56:42 +00:00
parent 26bdfd6480
commit eb40cac898
1 changed files with 39 additions and 2 deletions
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41
dom/ipc/MemMapSnapshot.cpp
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@ -8,11 +8,20 @@
#include "base/eintr_wrapper.h"
#include "base/file_util.h"
#include "mozilla/Assertions.h"
#include "mozilla/ResultExtensions.h"
#include "mozilla/ScopeExit.h"
#include "mozilla/ipc/FileDescriptorUtils.h"
#include "nsIFile.h"
#ifdef XP_WIN
# include "mozilla/RandomNum.h"
# include "mozilla/WindowsVersion.h"
# include "nsDebug.h"
# include "nsString.h"
# include <windows.h>
#endif
#ifdef XP_UNIX
# include <sys/stat.h>
#endif
@ -44,8 +53,36 @@ Result<Ok, nsresult> MemMapSnapshot::Finalize(AutoMemMap& aMem) {
#if defined(XP_WIN)
Result<Ok, nsresult> MemMapSnapshot::Create(size_t aSize) {
HANDLE handle = CreateFileMapping(INVALID_HANDLE_VALUE, nullptr,
PAGE_READWRITE, 0, DWORD(aSize), nullptr);
SECURITY_ATTRIBUTES sa;
SECURITY_DESCRIPTOR sd;
ACL dacl;
sa.nLength = sizeof(sa);
sa.lpSecurityDescriptor = &sd;
sa.bInheritHandle = FALSE;
if (NS_WARN_IF(!InitializeAcl(&dacl, sizeof(dacl), ACL_REVISION)) ||
NS_WARN_IF(
!InitializeSecurityDescriptor(&sd, SECURITY_DESCRIPTOR_REVISION)) ||
NS_WARN_IF(!SetSecurityDescriptorDacl(&sd, TRUE, &dacl, FALSE))) {
return Err(NS_ERROR_FAILURE);
}
nsAutoStringN<sizeof("MozSharedMem_") + 16 * 4> name;
if (!IsWin8Point1OrLater()) {
name.AssignLiteral("MozSharedMem_");
for (size_t i = 0; i < 4; ++i) {
Maybe<uint64_t> randomNum = RandomUint64();
if (NS_WARN_IF(randomNum.isNothing())) {
return Err(NS_ERROR_UNEXPECTED);
}
name.AppendPrintf("%016llx", *randomNum);
}
}
HANDLE handle =
CreateFileMapping(INVALID_HANDLE_VALUE, &sa, PAGE_READWRITE, 0,
DWORD(aSize), name.IsEmpty() ? nullptr : name.get());
if (!handle) {
return Err(NS_ERROR_FAILURE);