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Summary:
Currently `TransferBatch` are located within the same memory regions as
"regular" chunks. This is not ideal for security: they make for an interesting
target to overwrite, and are not protected by the frontend (namely, Scudo).
To solve this, we re-introduce `kUseSeparateSizeClassForBatch` for the 32-bit
Primary allowing for `TransferBatch` to end up in their own memory region.
Currently only Scudo would use this new feature, the default behavior remains
unchanged. The separate `kBatchClassID` was used for a brief period of time
previously but removed when the 64-bit ended up using the "free array".
Reviewers: alekseyshl, kcc, eugenis
Reviewed By: alekseyshl
Subscribers: llvm-commits, kubamracek
Differential Revision: https://reviews.llvm.org/D37082
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@311891 91177308-0d34-0410-b5e6-96231b3b80d8
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VeryCompactSizeClassMap for testing purposes
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@280266 91177308-0d34-0410-b5e6-96231b3b80d8
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git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@280185 91177308-0d34-0410-b5e6-96231b3b80d8
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allocator and one for 64-bit one. NFC. The two imlementations will diverge in the following changes.
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@279495 91177308-0d34-0410-b5e6-96231b3b80d8
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allocator's transfer batches. This saves 2x memory for the transfer batches (up to ~1.5% overall in some cases)
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@278179 91177308-0d34-0410-b5e6-96231b3b80d8
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SizeClassAllocator64/SizeClassAllocator32 because we actually need different iplementations for the 64- and 32-bit case. NFC; the following patches will make the TransferBatch implementations differ
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@277899 91177308-0d34-0410-b5e6-96231b3b80d8
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Second attempt after failed r276383 which was reverted.
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@277554 91177308-0d34-0410-b5e6-96231b3b80d8
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git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@276456 91177308-0d34-0410-b5e6-96231b3b80d8
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git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@276383 91177308-0d34-0410-b5e6-96231b3b80d8
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default). When true, it will cause all TransferBatches to be allocated on a separate dedicated size class, which improves security and may potentially simplify memory reclamation. However in the current state this may cause up to 3% extra memory usage. Subsequent changes should bring this overhead down
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@276377 91177308-0d34-0410-b5e6-96231b3b80d8
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SizeClassMap::MaxCached; ensure that TransferBatch size is a power of two, refactor TransferBatch creation/destruction into separate functions.
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@276318 91177308-0d34-0410-b5e6-96231b3b80d8
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git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@276195 91177308-0d34-0410-b5e6-96231b3b80d8
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