Bugzilla – Bug 1227847
VUL-0: CVE-2024-40917: kernel: memblock: make memblock_set_node() also warn about use of MAX_NUMNODES
Last modified: 2024-07-15 15:15:02 UTC
In the Linux kernel, the following vulnerability has been resolved: memblock: make memblock_set_node() also warn about use of MAX_NUMNODES On an (old) x86 system with SRAT just covering space above 4Gb: ACPI: SRAT: Node 0 PXM 0 [mem 0x100000000-0xfffffffff] hotplug the commit referenced below leads to this NUMA configuration no longer being refused by a CONFIG_NUMA=y kernel (previously NUMA: nodes only cover 6144MB of your 8185MB e820 RAM. Not used. No NUMA configuration found Faking a node at [mem 0x0000000000000000-0x000000027fffffff] was seen in the log directly after the message quoted above), because of memblock_validate_numa_coverage() checking for NUMA_NO_NODE (only). This in turn led to memblock_alloc_range_nid()'s warning about MAX_NUMNODES triggering, followed by a NULL deref in memmap_init() when trying to access node 64's (NODE_SHIFT=6) node data. To compensate said change, make memblock_set_node() warn on and adjust a passed in value of MAX_NUMNODES, just like various other functions already do. References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-40917 https://www.cve.org/CVERecord?id=CVE-2024-40917 https://git.kernel.org/stable/c/22f742b8f738918f683198a18ec3c691acda14c4 https://git.kernel.org/stable/c/e0eec24e2e199873f43df99ec39773ad3af2bff7 https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-40917.mbox