| 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-2021-47477: comedi: dt9812: fix DMA buffers on stack |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| comedi: dt9812: fix DMA buffers on stack |
| |
| USB transfer buffers are typically mapped for DMA and must not be |
| allocated on the stack or transfers will fail. |
| |
| Allocate proper transfer buffers in the various command helpers and |
| return an error on short transfers instead of acting on random stack |
| data. |
| |
| Note that this also fixes a stack info leak on systems where DMA is not |
| used as 32 bytes are always sent to the device regardless of how short |
| the command is. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47477 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 2.6.29 with commit 63274cd7d38a3322d90b66a5bc976de1fb899051 and fixed in 4.4.292 with commit a6af69768d5cb4b2528946d53be5fa19ade37723 |
| Issue introduced in 2.6.29 with commit 63274cd7d38a3322d90b66a5bc976de1fb899051 and fixed in 4.9.290 with commit 365a346cda82f51d835c49136a00a9df8a78c7f2 |
| Issue introduced in 2.6.29 with commit 63274cd7d38a3322d90b66a5bc976de1fb899051 and fixed in 4.14.255 with commit 8a52bc480992c7c9da3ebfea456af731f50a4b97 |
| Issue introduced in 2.6.29 with commit 63274cd7d38a3322d90b66a5bc976de1fb899051 and fixed in 4.19.217 with commit 39ea61037ae78f14fa121228dd962ea3280eacf3 |
| Issue introduced in 2.6.29 with commit 63274cd7d38a3322d90b66a5bc976de1fb899051 and fixed in 5.4.159 with commit 3efb7af8ac437085b6c776e5b54830b149d86efe |
| Issue introduced in 2.6.29 with commit 63274cd7d38a3322d90b66a5bc976de1fb899051 and fixed in 5.10.79 with commit 786f5b03450454557ff858a8bead5d7c0cbf78d6 |
| Issue introduced in 2.6.29 with commit 63274cd7d38a3322d90b66a5bc976de1fb899051 and fixed in 5.14.18 with commit 3ac273d154d634e2034508a14db82a95d7ad12ed |
| Issue introduced in 2.6.29 with commit 63274cd7d38a3322d90b66a5bc976de1fb899051 and fixed in 5.15.2 with commit 20cebb8b620dc987e55ddc46801de986e081757e |
| Issue introduced in 2.6.29 with commit 63274cd7d38a3322d90b66a5bc976de1fb899051 and fixed in 5.16 with commit 536de747bc48262225889a533db6650731ab25d3 |
| |
| 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-2021-47477 |
| 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/comedi/drivers/dt9812.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/a6af69768d5cb4b2528946d53be5fa19ade37723 |
| https://git.kernel.org/stable/c/365a346cda82f51d835c49136a00a9df8a78c7f2 |
| https://git.kernel.org/stable/c/8a52bc480992c7c9da3ebfea456af731f50a4b97 |
| https://git.kernel.org/stable/c/39ea61037ae78f14fa121228dd962ea3280eacf3 |
| https://git.kernel.org/stable/c/3efb7af8ac437085b6c776e5b54830b149d86efe |
| https://git.kernel.org/stable/c/786f5b03450454557ff858a8bead5d7c0cbf78d6 |
| https://git.kernel.org/stable/c/3ac273d154d634e2034508a14db82a95d7ad12ed |
| https://git.kernel.org/stable/c/20cebb8b620dc987e55ddc46801de986e081757e |
| https://git.kernel.org/stable/c/536de747bc48262225889a533db6650731ab25d3 |
