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Bug 599059: Always store length at the end of shared memory segments as a 32-bit value. Don't use "sizeof(size_t)" because that differs between i386 and x86_64 and causes crashes when running i386 plugins from a x86_64 host. r=cjones a=blocking-b7

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This commit is contained in:
Josh Aas 2010-09-24 02:31:47 -04:00
parent 17e54103a7
commit e14ca98532
2 changed files with 9 additions and 8 deletions
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11
ipc/glue/Shmem.cpp
View File

@ -370,6 +370,8 @@ Shmem::Alloc(IHadBetterBeIPDLCodeCallingThis_OtherwiseIAmADoodyhead,
SharedMemoryType aType,
bool aProtect)
{
NS_ASSERTION(aNBytes <= PR_UINT32_MAX, "Will truncate shmem segment size!");
size_t pageSize = SharedMemory::SystemPageSize();
SharedMemory* segment = nsnull;
// |2*pageSize| is for the front and back sentinel
@ -395,7 +397,6 @@ Shmem::Alloc(IHadBetterBeIPDLCodeCallingThis_OtherwiseIAmADoodyhead,
// initialize the segment with Shmem-internal information
Header* header = reinterpret_cast<Header*>(frontSentinel);
memcpy(header->mMagic, sMagic, sizeof(sMagic));
NS_ASSERTION(aNBytes <= PR_UINT32_MAX, "Will truncate shmem segment size!");
header->mSize = static_cast<uint32>(aNBytes);
if (aProtect)
@ -493,11 +494,11 @@ Shmem::Alloc(IHadBetterBeIPDLCodeCallingThis_OtherwiseIAmADoodyhead,
SharedMemory *segment = nsnull;
if (aType == SharedMemory::TYPE_BASIC)
segment = CreateSegment(PageAlignedSize(aNBytes + sizeof(size_t)),
segment = CreateSegment(PageAlignedSize(aNBytes + sizeof(uint32)),
SharedMemoryBasic::NULLHandle());
#ifdef MOZ_HAVE_SHAREDMEMORYSYSV
else if (aType == SharedMemory::TYPE_SYSV)
segment = CreateSegment(PageAlignedSize(aNBytes + sizeof(size_t)),
segment = CreateSegment(PageAlignedSize(aNBytes + sizeof(uint32)),
SharedMemorySysV::NULLHandle());
#endif
else
@ -507,7 +508,7 @@ Shmem::Alloc(IHadBetterBeIPDLCodeCallingThis_OtherwiseIAmADoodyhead,
if (!segment)
return 0;
*PtrToSize(segment) = aNBytes;
*PtrToSize(segment) = static_cast<uint32>(aNBytes);
return segment;
}
@ -560,7 +561,7 @@ Shmem::OpenExisting(IHadBetterBeIPDLCodeCallingThis_OtherwiseIAmADoodyhead,
return 0;
// this is the only validity check done OPT builds
if (size != *PtrToSize(segment))
if (size != static_cast<size_t>(*PtrToSize(segment)))
NS_RUNTIMEABORT("Alloc() segment size disagrees with OpenExisting()'s");
return segment;

6
ipc/glue/Shmem.h
View File

@ -122,7 +122,7 @@ public:
mSize(0),
mId(aId)
{
mSize = *PtrToSize(mSegment);
mSize = static_cast<size_t>(*PtrToSize(mSegment));
}
#else
Shmem(IHadBetterBeIPDLCodeCallingThis_OtherwiseIAmADoodyhead,
@ -274,12 +274,12 @@ private:
void AssertInvariants() const
{ }
static size_t*
static uint32*
PtrToSize(SharedMemory* aSegment)
{
char* endOfSegment =
reinterpret_cast<char*>(aSegment->memory()) + aSegment->Size();
return reinterpret_cast<size_t*>(endOfSegment - sizeof(size_t));
return reinterpret_cast<uint32*>(endOfSegment - sizeof(uint32));
}
#else