CVE - CVE-2022-48731

CVE-ID
CVE-2022-48731	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: mm/kmemleak: avoid scanning potential huge holes When using devm_request_free_mem_region() and devm_memremap_pages() to add ZONE_DEVICE memory, if requested free mem region's end pfn were huge(e.g., 0x400000000), the node_end_pfn() will be also huge (see move_pfn_range_to_zone()). Thus it creates a huge hole between node_start_pfn() and node_end_pfn(). We found on some AMD APUs, amdkfd requested such a free mem region and created a huge hole. In such a case, following code snippet was just doing busy test_bit() looping on the huge hole. for (pfn = start_pfn; pfn < end_pfn; pfn++) { struct page *page = pfn_to_online_page(pfn); if (!page) continue; ... } So we got a soft lockup: watchdog: BUG: soft lockup - CPU#6 stuck for 26s! [bash:1221] CPU: 6 PID: 1221 Comm: bash Not tainted 5.15.0-custom #1 RIP: 0010:pfn_to_online_page+0x5/0xd0 Call Trace: ? kmemleak_scan+0x16a/0x440 kmemleak_write+0x306/0x3a0 ? common_file_perm+0x72/0x170 full_proxy_write+0x5c/0x90 vfs_write+0xb9/0x260 ksys_write+0x67/0xe0 __x64_sys_write+0x1a/0x20 do_syscall_64+0x3b/0xc0 entry_SYSCALL_64_after_hwframe+0x44/0xae I did some tests with the patch. (1) amdgpu module unloaded before the patch: real 0m0.976s user 0m0.000s sys 0m0.968s after the patch: real 0m0.981s user 0m0.000s sys 0m0.973s (2) amdgpu module loaded before the patch: real 0m35.365s user 0m0.000s sys 0m35.354s after the patch: real 0m1.049s user 0m0.000s sys 0m1.042s
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/352715593e81b917ce1b321e794549815b850134 URL:https://git.kernel.org/stable/c/352715593e81b917ce1b321e794549815b850134 MISC:https://git.kernel.org/stable/c/a5389c80992f0001ee505838fe6a8b20897ce96e URL:https://git.kernel.org/stable/c/a5389c80992f0001ee505838fe6a8b20897ce96e MISC:https://git.kernel.org/stable/c/c10a0f877fe007021d70f9cada240f42adc2b5db URL:https://git.kernel.org/stable/c/c10a0f877fe007021d70f9cada240f42adc2b5db MISC:https://git.kernel.org/stable/c/cebb0aceb21ad91429617a40e3a17444fabf1529 URL:https://git.kernel.org/stable/c/cebb0aceb21ad91429617a40e3a17444fabf1529 MISC:https://git.kernel.org/stable/c/d3533ee20e9a0e2e8f60384da7450d43d1c63d1a URL:https://git.kernel.org/stable/c/d3533ee20e9a0e2e8f60384da7450d43d1c63d1a
Assigning CNA
kernel.org
Date Record Created
20240620	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240620)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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