| From bippy-7c5fe7eed585 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2022-49747: erofs/zmap.c: Fix incorrect offset calculation |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| erofs/zmap.c: Fix incorrect offset calculation |
| |
| Effective offset to add to length was being incorrectly calculated, |
| which resulted in iomap->length being set to 0, triggering a WARN_ON |
| in iomap_iter_done(). |
| |
| Fix that, and describe it in comments. |
| |
| This was reported as a crash by syzbot under an issue about a warning |
| encountered in iomap_iter_done(), but unrelated to erofs. |
| |
| C reproducer: https://syzkaller.appspot.com/text?tag=ReproC&x=1037a6b2880000 |
| Kernel config: https://syzkaller.appspot.com/text?tag=KernelConfig&x=e2021a61197ebe02 |
| Dashboard link: https://syzkaller.appspot.com/bug?extid=a8e049cd3abd342936b6 |
| |
| The Linux kernel CVE team has assigned CVE-2022-49747 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.15 with commit eadcd6b5a1eb39866ab8d8a3e4f2e51bc51a2350 and fixed in 5.15.92 with commit 2144859229c1e74f52d3ea067338d314a83a8afb |
| Issue introduced in 5.15 with commit eadcd6b5a1eb39866ab8d8a3e4f2e51bc51a2350 and fixed in 6.1.10 with commit 9f31d8c889d9a4e47bfcc6c4537d0c9f89fe582c |
| Issue introduced in 5.15 with commit eadcd6b5a1eb39866ab8d8a3e4f2e51bc51a2350 and fixed in 6.2 with commit 6acd87d50998ef0afafc441613aeaf5a8f5c9eff |
| |
| Please see https://www.kernel.org for 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-2022-49747 |
| 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: |
| fs/erofs/zmap.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/2144859229c1e74f52d3ea067338d314a83a8afb |
| https://git.kernel.org/stable/c/9f31d8c889d9a4e47bfcc6c4537d0c9f89fe582c |
| https://git.kernel.org/stable/c/6acd87d50998ef0afafc441613aeaf5a8f5c9eff |
