| From bippy-1.2.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2022-21546: scsi: target: Fix WRITE_SAME No Data Buffer crash |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| scsi: target: Fix WRITE_SAME No Data Buffer crash |
| |
| In newer version of the SBC specs, we have a NDOB bit that indicates there |
| is no data buffer that gets written out. If this bit is set using commands |
| like "sg_write_same --ndob" we will crash in target_core_iblock/file's |
| execute_write_same handlers when we go to access the se_cmd->t_data_sg |
| because its NULL. |
| |
| This patch adds a check for the NDOB bit in the common WRITE SAME code |
| because we don't support it. And, it adds a check for zero SG elements in |
| each handler in case the initiator tries to send a normal WRITE SAME with |
| no data buffer. |
| |
| The Linux kernel CVE team has assigned CVE-2022-21546 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.4.294 with commit 54e57be2573cf0b8bf650375fd8752987b6c3d3b |
| Fixed in 5.10.238 with commit d8e6a27e9238dd294d6f2f401655f300dca20899 |
| Fixed in 5.15.182 with commit 4226622647e3e5ac06d3ebc1605b917446157510 |
| Fixed in 5.19 with commit ccd3f449052449a917a3e577d8ba0368f43b8f29 |
| |
| 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-2022-21546 |
| 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: |
| drivers/target/target_core_file.c |
| drivers/target/target_core_iblock.c |
| drivers/target/target_core_sbc.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/54e57be2573cf0b8bf650375fd8752987b6c3d3b |
| https://git.kernel.org/stable/c/d8e6a27e9238dd294d6f2f401655f300dca20899 |
| https://git.kernel.org/stable/c/4226622647e3e5ac06d3ebc1605b917446157510 |
| https://git.kernel.org/stable/c/ccd3f449052449a917a3e577d8ba0368f43b8f29 |
