lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Message-ID: <2024030248-CVE-2023-52501-75ba@gregkh> Date: Sat, 2 Mar 2024 22:52:46 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2023-52501: ring-buffer: Do not attempt to read past "commit" Description =========== In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Do not attempt to read past "commit" When iterating over the ring buffer while the ring buffer is active, the writer can corrupt the reader. There's barriers to help detect this and handle it, but that code missed the case where the last event was at the very end of the page and has only 4 bytes left. The checks to detect the corruption by the writer to reads needs to see the length of the event. If the length in the first 4 bytes is zero then the length is stored in the second 4 bytes. But if the writer is in the process of updating that code, there's a small window where the length in the first 4 bytes could be zero even though the length is only 4 bytes. That will cause rb_event_length() to read the next 4 bytes which could happen to be off the allocated page. To protect against this, fail immediately if the next event pointer is less than 8 bytes from the end of the commit (last byte of data), as all events must be a minimum of 8 bytes anyway. The Linux kernel CVE team has assigned CVE-2023-52501 to this issue. Affected and fixed versions =========================== Fixed in 5.10.198 with commit cee5151c5410 Fixed in 5.15.134 with commit 344f2f3e61a9 Fixed in 6.1.56 with commit b08a4938229d Fixed in 6.5.6 with commit 75fc9e99b3a7 Fixed in 6.6 with commit 95a404bd60af Please see https://www.kernel.org or a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2023-52501 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: kernel/trace/ring_buffer.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/cee5151c5410e868826b8afecfb356f3799ebea3 https://git.kernel.org/stable/c/344f2f3e61a90f0150c754796ec9a17fcaeec03d https://git.kernel.org/stable/c/b08a4938229dbb530a35c41b83002a1457c6ff49 https://git.kernel.org/stable/c/75fc9e99b3a71006720ad1e029db11a4b5c32d4a https://git.kernel.org/stable/c/95a404bd60af6c4d9d8db01ad14fe8957ece31ca
Powered by blists - more mailing lists