Bug 1447556
| Summary: | glibc: malloc: check for chunk_size == next->prev->chunk_size in unlink | ||
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| Product: | Red Hat Enterprise Linux 7 | Reporter: | Florian Weimer <fweimer> |
| Component: | glibc | Assignee: | DJ Delorie <dj> |
| Status: | CLOSED ERRATA | QA Contact: | Sergey Kolosov <skolosov> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 7.4 | CC: | ashankar, dj, fweimer, mcermak, mnewsome, pfrankli, skolosov |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | glibc-2.17-197.el7 | Doc Type: | Enhancement |
| Doc Text: |
This patch adds an additional check for applications which change memory outside of the range allocated by malloc(), thus further hardening the malloc internals against both accidental and malicious overflows.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2018-04-10 13:58:28 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | |||
| Bug Blocks: | 1473718 | ||
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2018:0805 |
We should backport this additional upstream hardening: commit 17f487b7afa7cd6c316040f3e6c86dc96b2eec30 Author: DJ Delorie <dj> Date: Fri Mar 17 15:31:38 2017 -0400 Further harden glibc malloc metadata against 1-byte overflows. Additional check for chunk_size == next->prev->chunk_size in unlink() 2017-03-17 Chris Evans <scarybeasts> * malloc/malloc.c (unlink): Add consistency check between size and next->prev->size, to further harden against 1-byte overflows. This is on top of the hardening in bug 1326739.