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commit e006c0b0d909f8a5715d3ad55c47ce626e70473e Author: Nika Layzell nika@thelayzells.com AuthorDate: Mon Mar 21 14:37:50 2022 +0000
Bug 1757805 - Add additional assertions around shmem size, r=ipc-reviewers,handyman a=RyanVM
Differential Revision: https://phabricator.services.mozilla.com/D140097 --- ipc/glue/Shmem.cpp | 10 ++++++++++ ipc/glue/Shmem.h | 7 ------- 2 files changed, 10 insertions(+), 7 deletions(-)
diff --git a/ipc/glue/Shmem.cpp b/ipc/glue/Shmem.cpp index 00bec892fabe5..7bcd4c7709134 100644 --- a/ipc/glue/Shmem.cpp +++ b/ipc/glue/Shmem.cpp @@ -241,6 +241,9 @@ Shmem::Shmem(PrivateIPDLCaller, SharedMemory* aSegment, id_t aId) mSize = static_cast<size_t>(header->mSize);
size_t pageSize = SharedMemory::SystemPageSize(); + MOZ_ASSERT(mSegment->Size() - (2 * pageSize) >= mSize, + "illegal size in shared memory segment"); + // transition into the "mapped" state by protecting the front and // back sentinels (which guard against buffer under/overflows) mSegment->Protect(frontSentinel, pageSize, RightsNone); @@ -373,6 +376,13 @@ void Shmem::Dealloc(PrivateIPDLCaller, SharedMemory* aSegment) {
#else // !defined(DEBUG)
+Shmem::Shmem(PrivateIPDLCaller, SharedMemory* aSegment, id_t aId) + : mSegment(aSegment), mData(aSegment->memory()), mSize(0), mId(aId) { + mSize = static_cast<size_t>(*PtrToSize(mSegment)); + MOZ_RELEASE_ASSERT(mSegment->Size() - sizeof(uint32_t) >= mSize, + "illegal size in shared memory segment"); +} + // static already_AddRefedShmem::SharedMemory Shmem::Alloc(PrivateIPDLCaller, size_t aNBytes, diff --git a/ipc/glue/Shmem.h b/ipc/glue/Shmem.h index 48a3779d2c286..cb0bb024f8c3c 100644 --- a/ipc/glue/Shmem.h +++ b/ipc/glue/Shmem.h @@ -84,14 +84,7 @@ class Shmem final {
Shmem(const Shmem& aOther) = default;
-#if !defined(DEBUG) - Shmem(PrivateIPDLCaller, SharedMemory* aSegment, id_t aId) - : mSegment(aSegment), mData(aSegment->memory()), mSize(0), mId(aId) { - mSize = static_cast<size_t>(*PtrToSize(mSegment)); - } -#else Shmem(PrivateIPDLCaller, SharedMemory* aSegment, id_t aId); -#endif
~Shmem() { // Shmem only holds a "weak ref" to the actual segment, which is