Bugzilla – Bug 1226594
VUL-0: CVE-2024-38543: kernel: lib/test_hmm.c: handle src_pfns and dst_pfns allocation failure
Last modified: 2024-07-08 15:11:43 UTC
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. References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-38543 https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-38543.mbox 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 https://www.cve.org/CVERecord?id=CVE-2024-38543
This is a selftest driver for HMM. We do compile it on SLE15-SP5 which is the only one that would need the fix. I really do not see any actual security implications that we should be worried about. CCing Vlastimil for awareness. I would go with WONTFIX.
Ack