| 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-2024-38543: lib/test_hmm.c: handle src_pfns and dst_pfns allocation failure |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| lib/test_hmm.c: handle src_pfns and dst_pfns allocation failure |
| |
| The kcalloc() in dmirror_device_evict_chunk() will return null if the |
| physical memory has run out. As a result, if src_pfns or dst_pfns is |
| dereferenced, the null pointer dereference bug will happen. |
| |
| Moreover, the device is going away. If the kcalloc() fails, the pages |
| mapping a chunk could not be evicted. So add a __GFP_NOFAIL flag in |
| kcalloc(). |
| |
| Finally, as there is no need to have physically contiguous memory, Switch |
| kcalloc() to kvcalloc() in order to avoid failing allocations. |
| |
| The Linux kernel CVE team has assigned CVE-2024-38543 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.8 with commit b2ef9f5a5cb37643ca5def3516c546457074b882 and fixed in 6.1.93 with commit 1a21fdeea502658e315bd939409b755974f4fb64 |
| Issue introduced in 5.8 with commit b2ef9f5a5cb37643ca5def3516c546457074b882 and fixed in 6.6.33 with commit 65e528a69cb3ed4a286c45b4afba57461c8b5b33 |
| Issue introduced in 5.8 with commit b2ef9f5a5cb37643ca5def3516c546457074b882 and fixed in 6.8.12 with commit ce47e8ead9a72834cc68431d53f8092ce69bebb7 |
| Issue introduced in 5.8 with commit b2ef9f5a5cb37643ca5def3516c546457074b882 and fixed in 6.9.3 with commit 3b20d18f475bd17309db640dbe7d7c7ebb5bc2bc |
| Issue introduced in 5.8 with commit b2ef9f5a5cb37643ca5def3516c546457074b882 and fixed in 6.10 with commit c2af060d1c18beaec56351cf9c9bcbbc5af341a3 |
| |
| 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-2024-38543 |
| 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: |
| lib/test_hmm.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/1a21fdeea502658e315bd939409b755974f4fb64 |
| https://git.kernel.org/stable/c/65e528a69cb3ed4a286c45b4afba57461c8b5b33 |
| https://git.kernel.org/stable/c/ce47e8ead9a72834cc68431d53f8092ce69bebb7 |
| https://git.kernel.org/stable/c/3b20d18f475bd17309db640dbe7d7c7ebb5bc2bc |
| https://git.kernel.org/stable/c/c2af060d1c18beaec56351cf9c9bcbbc5af341a3 |
