Replay allocators #52
Open
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
mjp41
force-pushed
the
replay_allocators
branch
3 times, most recently
from
7ee9d21 to
2bc2acc
Compare
Asan delays reallocation to increase the likelyhood of catching a UAF. This adds a simple free list allocator that tries to reuse allocations quickly to increase the chance of an ABA problem being detected.
mjp41
force-pushed
the
replay_allocators
branch
from
4485f76 to
2deb47a
Compare
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Add an extra option to the heap to allow for deterministic reallocation of memory.
To detect certain ABA issues, we require memory to be reallocated quickly. In Asan this is not the case, as it delays reallocation to improve the chances of catching use-after-free bugs.
This takes advantage of the refactoring in #51 to enable an alternative heap implementation that is integrated with systematic testing to allow objects to be reused.
This will address #50.
[Note initially contains the changes for #51, but will be removed once that lands on main.]