| { |
| "containers": { |
| "cna": { |
| "providerMetadata": { |
| "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" |
| }, |
| "descriptions": [ |
| { |
| "lang": "en", |
| "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/gup: reject FOLL_SPLIT_PMD with hugetlb VMAs\n\nPatch series \"mm: fixes for device-exclusive entries (hmm)\", v2.\n\nDiscussing the PageTail() call in make_device_exclusive_range() with\nWilly, I recently discovered [1] that device-exclusive handling does not\nproperly work with THP, making the hmm-tests selftests fail if THPs are\nenabled on the system.\n\nLooking into more details, I found that hugetlb is not properly fenced,\nand I realized that something that was bugging me for longer -- how\ndevice-exclusive entries interact with mapcounts -- completely breaks\nmigration/swapout/split/hwpoison handling of these folios while they have\ndevice-exclusive PTEs.\n\nThe program below can be used to allocate 1 GiB worth of pages and making\nthem device-exclusive on a kernel with CONFIG_TEST_HMM.\n\nOnce they are device-exclusive, these folios cannot get swapped out\n(proc$pid/smaps_rollup will always indicate 1 GiB RSS no matter how much\none forces memory reclaim), and when having a memory block onlined to\nZONE_MOVABLE, trying to offline it will loop forever and complain about\nfailed migration of a page that should be movable.\n\n# echo offline > /sys/devices/system/memory/memory136/state\n# echo online_movable > /sys/devices/system/memory/memory136/state\n# ./hmm-swap &\n... wait until everything is device-exclusive\n# echo offline > /sys/devices/system/memory/memory136/state\n[ 285.193431][T14882] page: refcount:2 mapcount:0 mapping:0000000000000000\n index:0x7f20671f7 pfn:0x442b6a\n[ 285.196618][T14882] memcg:ffff888179298000\n[ 285.198085][T14882] anon flags: 0x5fff0000002091c(referenced|uptodate|\n dirty|active|owner_2|swapbacked|node=1|zone=3|lastcpupid=0x7ff)\n[ 285.201734][T14882] raw: ...\n[ 285.204464][T14882] raw: ...\n[ 285.207196][T14882] page dumped because: migration failure\n[ 285.209072][T14882] page_owner tracks the page as allocated\n[ 285.210915][T14882] page last allocated via order 0, migratetype\n Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_COMP|__GFP_ZERO),\n id 14926, tgid 14926 (hmm-swap), ts 254506295376, free_ts 227402023774\n[ 285.216765][T14882] post_alloc_hook+0x197/0x1b0\n[ 285.218874][T14882] get_page_from_freelist+0x76e/0x3280\n[ 285.220864][T14882] __alloc_frozen_pages_noprof+0x38e/0x2740\n[ 285.223302][T14882] alloc_pages_mpol+0x1fc/0x540\n[ 285.225130][T14882] folio_alloc_mpol_noprof+0x36/0x340\n[ 285.227222][T14882] vma_alloc_folio_noprof+0xee/0x1a0\n[ 285.229074][T14882] __handle_mm_fault+0x2b38/0x56a0\n[ 285.230822][T14882] handle_mm_fault+0x368/0x9f0\n...\n\nThis series fixes all issues I found so far. There is no easy way to fix\nwithout a bigger rework/cleanup. I have a bunch of cleanups on top (some\nprevious sent, some the result of the discussion in v1) that I will send\nout separately once this landed and I get to it.\n\nI wish we could just use some special present PROT_NONE PTEs instead of\nthese (non-present, non-none) fake-swap entries; but that just results in\nthe same problem we keep having (lack of spare PTE bits), and staring at\nother similar fake-swap entries, that ship has sailed.\n\nWith this series, make_device_exclusive() doesn't actually belong into\nmm/rmap.c anymore, but I'll leave moving that for another day.\n\nI only tested this series with the hmm-tests selftests due to lack of HW,\nso I'd appreciate some testing, especially if the interaction between two\nGPUs wanting a device-exclusive entry works as expected.\n\n<program>\n#include <stdio.h>\n#include <fcntl.h>\n#include <stdint.h>\n#include <unistd.h>\n#include <stdlib.h>\n#include <string.h>\n#include <sys/mman.h>\n#include <sys/ioctl.h>\n#include <linux/types.h>\n#include <linux/ioctl.h>\n\n#define HMM_DMIRROR_EXCLUSIVE _IOWR('H', 0x05, struct hmm_dmirror_cmd)\n\nstruct hmm_dmirror_cmd {\n\t__u64 addr;\n\t__u64 ptr;\n\t__u64 npages;\n\t__u64 cpages;\n\t__u64 faults;\n};\n\nconst size_t size = 1 * 1024 * 1024 * 1024ul;\nconst size_t chunk_size = 2 * 1024 * 1024ul;\n\nint m\n---truncated---" |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "mm/gup.c" |
| ], |
| "versions": [ |
| { |
| "version": "9cb28da54643ad464c47585cd5866c30b0218e67", |
| "lessThan": "2e877ff3492267def06dd50cb165dc9ab8838e7d", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "9cb28da54643ad464c47585cd5866c30b0218e67", |
| "lessThan": "48d28417c66cce2f3b0ba773fcb6695a56eff220", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "9cb28da54643ad464c47585cd5866c30b0218e67", |
| "lessThan": "fd900832e8440046627b60697687ab5d04398008", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "9cb28da54643ad464c47585cd5866c30b0218e67", |
| "lessThan": "8977752c8056a6a094a279004a49722da15bace3", |
| "status": "affected", |
| "versionType": "git" |
| } |
| ] |
| }, |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "affected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "mm/gup.c" |
| ], |
| "versions": [ |
| { |
| "version": "6.10", |
| "status": "affected" |
| }, |
| { |
| "version": "0", |
| "lessThan": "6.10", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.12.23", |
| "lessThanOrEqual": "6.12.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.13.11", |
| "lessThanOrEqual": "6.13.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.14.2", |
| "lessThanOrEqual": "6.14.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.15", |
| "lessThanOrEqual": "*", |
| "status": "unaffected", |
| "versionType": "original_commit_for_fix" |
| } |
| ] |
| } |
| ], |
| "cpeApplicability": [ |
| { |
| "nodes": [ |
| { |
| "operator": "OR", |
| "negate": false, |
| "cpeMatch": [ |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "6.10", |
| "versionEndExcluding": "6.12.23" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "6.10", |
| "versionEndExcluding": "6.13.11" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "6.10", |
| "versionEndExcluding": "6.14.2" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "6.10", |
| "versionEndExcluding": "6.15" |
| } |
| ] |
| } |
| ] |
| } |
| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/2e877ff3492267def06dd50cb165dc9ab8838e7d" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/48d28417c66cce2f3b0ba773fcb6695a56eff220" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/fd900832e8440046627b60697687ab5d04398008" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/8977752c8056a6a094a279004a49722da15bace3" |
| } |
| ], |
| "title": "mm/gup: reject FOLL_SPLIT_PMD with hugetlb VMAs", |
| "x_generator": { |
| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2025-22034", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
