| From bippy-5f407fcff5a0 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-2022-48635: fsdax: Fix infinite loop in dax_iomap_rw() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| fsdax: Fix infinite loop in dax_iomap_rw() |
| |
| I got an infinite loop and a WARNING report when executing a tail command |
| in virtiofs. |
| |
| WARNING: CPU: 10 PID: 964 at fs/iomap/iter.c:34 iomap_iter+0x3a2/0x3d0 |
| Modules linked in: |
| CPU: 10 PID: 964 Comm: tail Not tainted 5.19.0-rc7 |
| Call Trace: |
| <TASK> |
| dax_iomap_rw+0xea/0x620 |
| ? __this_cpu_preempt_check+0x13/0x20 |
| fuse_dax_read_iter+0x47/0x80 |
| fuse_file_read_iter+0xae/0xd0 |
| new_sync_read+0xfe/0x180 |
| ? 0xffffffff81000000 |
| vfs_read+0x14d/0x1a0 |
| ksys_read+0x6d/0xf0 |
| __x64_sys_read+0x1a/0x20 |
| do_syscall_64+0x3b/0x90 |
| entry_SYSCALL_64_after_hwframe+0x63/0xcd |
| |
| The tail command will call read() with a count of 0. In this case, |
| iomap_iter() will report this WARNING, and always return 1 which casuing |
| the infinite loop in dax_iomap_rw(). |
| |
| Fixing by checking count whether is 0 in dax_iomap_rw(). |
| |
| The Linux kernel CVE team has assigned CVE-2022-48635 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.15 with commit ca289e0b95afa973d204c77a4ad5c37e06145fbf and fixed in 5.15.71 with commit 929ef155e1da41c06f4d8ca86ae12b851a83a744 |
| Issue introduced in 5.15 with commit ca289e0b95afa973d204c77a4ad5c37e06145fbf and fixed in 5.19.12 with commit 60644dffac87b1bb47bdb393aa29d5f2ffcf41a0 |
| Issue introduced in 5.15 with commit ca289e0b95afa973d204c77a4ad5c37e06145fbf and fixed in 6.0 with commit 17d9c15c9b9e7fb285f7ac5367dfb5f00ff575e3 |
| |
| 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-2022-48635 |
| 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/dax.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/929ef155e1da41c06f4d8ca86ae12b851a83a744 |
| https://git.kernel.org/stable/c/60644dffac87b1bb47bdb393aa29d5f2ffcf41a0 |
| https://git.kernel.org/stable/c/17d9c15c9b9e7fb285f7ac5367dfb5f00ff575e3 |
