| { |
| "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, thp: bail out early in collapse_file for writeback page\n\nCurrently collapse_file does not explicitly check PG_writeback, instead,\npage_has_private and try_to_release_page are used to filter writeback\npages. This does not work for xfs with blocksize equal to or larger\nthan pagesize, because in such case xfs has no page->private.\n\nThis makes collapse_file bail out early for writeback page. Otherwise,\nxfs end_page_writeback will panic as follows.\n\n page:fffffe00201bcc80 refcount:0 mapcount:0 mapping:ffff0003f88c86a8 index:0x0 pfn:0x84ef32\n aops:xfs_address_space_operations [xfs] ino:30000b7 dentry name:\"libtest.so\"\n flags: 0x57fffe0000008027(locked|referenced|uptodate|active|writeback)\n raw: 57fffe0000008027 ffff80001b48bc28 ffff80001b48bc28 ffff0003f88c86a8\n raw: 0000000000000000 0000000000000000 00000000ffffffff ffff0000c3e9a000\n page dumped because: VM_BUG_ON_PAGE(((unsigned int) page_ref_count(page) + 127u <= 127u))\n page->mem_cgroup:ffff0000c3e9a000\n ------------[ cut here ]------------\n kernel BUG at include/linux/mm.h:1212!\n Internal error: Oops - BUG: 0 [#1] SMP\n Modules linked in:\n BUG: Bad page state in process khugepaged pfn:84ef32\n xfs(E)\n page:fffffe00201bcc80 refcount:0 mapcount:0 mapping:0 index:0x0 pfn:0x84ef32\n libcrc32c(E) rfkill(E) aes_ce_blk(E) crypto_simd(E) ...\n CPU: 25 PID: 0 Comm: swapper/25 Kdump: loaded Tainted: ...\n pstate: 60400005 (nZCv daif +PAN -UAO -TCO BTYPE=--)\n Call trace:\n end_page_writeback+0x1c0/0x214\n iomap_finish_page_writeback+0x13c/0x204\n iomap_finish_ioend+0xe8/0x19c\n iomap_writepage_end_bio+0x38/0x50\n bio_endio+0x168/0x1ec\n blk_update_request+0x278/0x3f0\n blk_mq_end_request+0x34/0x15c\n virtblk_request_done+0x38/0x74 [virtio_blk]\n blk_done_softirq+0xc4/0x110\n __do_softirq+0x128/0x38c\n __irq_exit_rcu+0x118/0x150\n irq_exit+0x1c/0x30\n __handle_domain_irq+0x8c/0xf0\n gic_handle_irq+0x84/0x108\n el1_irq+0xcc/0x180\n arch_cpu_idle+0x18/0x40\n default_idle_call+0x4c/0x1a0\n cpuidle_idle_call+0x168/0x1e0\n do_idle+0xb4/0x104\n cpu_startup_entry+0x30/0x9c\n secondary_start_kernel+0x104/0x180\n Code: d4210000 b0006161 910c8021 94013f4d (d4210000)\n ---[ end trace 4a88c6a074082f8c ]---\n Kernel panic - not syncing: Oops - BUG: Fatal exception in interrupt" |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "mm/khugepaged.c" |
| ], |
| "versions": [ |
| { |
| "version": "99cb0dbd47a15d395bf3faa78dc122bc5efe3fc0", |
| "lessThan": "69a7fa5cb0de06c8956b040f19a7248c8c8308ca", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "99cb0dbd47a15d395bf3faa78dc122bc5efe3fc0", |
| "lessThan": "5e669d8ab30ab61dec3c36e27b4711f07611e6fc", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "99cb0dbd47a15d395bf3faa78dc122bc5efe3fc0", |
| "lessThan": "74c42e1baacf206338b1dd6b6199ac964512b5bb", |
| "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/khugepaged.c" |
| ], |
| "versions": [ |
| { |
| "version": "5.4", |
| "status": "affected" |
| }, |
| { |
| "version": "0", |
| "lessThan": "5.4", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.10.77", |
| "lessThanOrEqual": "5.10.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.14.16", |
| "lessThanOrEqual": "5.14.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.15", |
| "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": "5.4", |
| "versionEndExcluding": "5.10.77" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "5.4", |
| "versionEndExcluding": "5.14.16" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "5.4", |
| "versionEndExcluding": "5.15" |
| } |
| ] |
| } |
| ] |
| } |
| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/69a7fa5cb0de06c8956b040f19a7248c8c8308ca" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/5e669d8ab30ab61dec3c36e27b4711f07611e6fc" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/74c42e1baacf206338b1dd6b6199ac964512b5bb" |
| } |
| ], |
| "title": "mm, thp: bail out early in collapse_file for writeback page", |
| "x_generator": { |
| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2021-47492", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
