| { |
| "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/filemap: make MAX_PAGECACHE_ORDER acceptable to xarray\n\nPatch series \"mm/filemap: Limit page cache size to that supported by\nxarray\", v2.\n\nCurrently, xarray can't support arbitrary page cache size. More details\ncan be found from the WARN_ON() statement in xas_split_alloc(). In our\ntest whose code is attached below, we hit the WARN_ON() on ARM64 system\nwhere the base page size is 64KB and huge page size is 512MB. The issue\nwas reported long time ago and some discussions on it can be found here\n[1].\n\n[1] https://www.spinics.net/lists/linux-xfs/msg75404.html\n\nIn order to fix the issue, we need to adjust MAX_PAGECACHE_ORDER to one\nsupported by xarray and avoid PMD-sized page cache if needed. The code\nchanges are suggested by David Hildenbrand.\n\nPATCH[1] adjusts MAX_PAGECACHE_ORDER to that supported by xarray\nPATCH[2-3] avoids PMD-sized page cache in the synchronous readahead path\nPATCH[4] avoids PMD-sized page cache for shmem files if needed\n\nTest program\n============\n# cat test.c\n#define _GNU_SOURCE\n#include <stdio.h>\n#include <stdlib.h>\n#include <unistd.h>\n#include <string.h>\n#include <fcntl.h>\n#include <errno.h>\n#include <sys/syscall.h>\n#include <sys/mman.h>\n\n#define TEST_XFS_FILENAME\t\"/tmp/data\"\n#define TEST_SHMEM_FILENAME\t\"/dev/shm/data\"\n#define TEST_MEM_SIZE\t\t0x20000000\n\nint main(int argc, char **argv)\n{\n\tconst char *filename;\n\tint fd = 0;\n\tvoid *buf = (void *)-1, *p;\n\tint pgsize = getpagesize();\n\tint ret;\n\n\tif (pgsize != 0x10000) {\n\t\tfprintf(stderr, \"64KB base page size is required\\n\");\n\t\treturn -EPERM;\n\t}\n\n\tsystem(\"echo force > /sys/kernel/mm/transparent_hugepage/shmem_enabled\");\n\tsystem(\"rm -fr /tmp/data\");\n\tsystem(\"rm -fr /dev/shm/data\");\n\tsystem(\"echo 1 > /proc/sys/vm/drop_caches\");\n\n\t/* Open xfs or shmem file */\n\tfilename = TEST_XFS_FILENAME;\n\tif (argc > 1 && !strcmp(argv[1], \"shmem\"))\n\t\tfilename = TEST_SHMEM_FILENAME;\n\n\tfd = open(filename, O_CREAT | O_RDWR | O_TRUNC);\n\tif (fd < 0) {\n\t\tfprintf(stderr, \"Unable to open <%s>\\n\", filename);\n\t\treturn -EIO;\n\t}\n\n\t/* Extend file size */\n\tret = ftruncate(fd, TEST_MEM_SIZE);\n\tif (ret) {\n\t\tfprintf(stderr, \"Error %d to ftruncate()\\n\", ret);\n\t\tgoto cleanup;\n\t}\n\n\t/* Create VMA */\n\tbuf = mmap(NULL, TEST_MEM_SIZE,\n\t\t PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);\n\tif (buf == (void *)-1) {\n\t\tfprintf(stderr, \"Unable to mmap <%s>\\n\", filename);\n\t\tgoto cleanup;\n\t}\n\n\tfprintf(stdout, \"mapped buffer at 0x%p\\n\", buf);\n\tret = madvise(buf, TEST_MEM_SIZE, MADV_HUGEPAGE);\n if (ret) {\n\t\tfprintf(stderr, \"Unable to madvise(MADV_HUGEPAGE)\\n\");\n\t\tgoto cleanup;\n\t}\n\n\t/* Populate VMA */\n\tret = madvise(buf, TEST_MEM_SIZE, MADV_POPULATE_WRITE);\n\tif (ret) {\n\t\tfprintf(stderr, \"Error %d to madvise(MADV_POPULATE_WRITE)\\n\", ret);\n\t\tgoto cleanup;\n\t}\n\n\t/* Punch the file to enforce xarray split */\n\tret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,\n \t\tTEST_MEM_SIZE - pgsize, pgsize);\n\tif (ret)\n\t\tfprintf(stderr, \"Error %d to fallocate()\\n\", ret);\n\ncleanup:\n\tif (buf != (void *)-1)\n\t\tmunmap(buf, TEST_MEM_SIZE);\n\tif (fd > 0)\n\t\tclose(fd);\n\n\treturn 0;\n}\n\n# gcc test.c -o test\n# cat /proc/1/smaps | grep KernelPageSize | head -n 1\nKernelPageSize: 64 kB\n# ./test shmem\n :\n------------[ cut here ]------------\nWARNING: CPU: 17 PID: 5253 at lib/xarray.c:1025 xas_split_alloc+0xf8/0x128\nModules linked in: nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib \\\nnft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct \\\nnft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 \\\nip_set nf_tables rfkill nfnetlink vfat fat virtio_balloon \\\ndrm fuse xfs libcrc32c crct10dif_ce ghash_ce sha2_ce sha256_arm64 \\\nvirtio_net sha1_ce net_failover failover virtio_console virtio_blk \\\ndimlib virtio_mmio\nCPU: 17 PID: 5253 Comm: test Kdump: loaded Tainted: G W 6.10.0-rc5-gavin+ #12\nHardware name: QEMU KVM Virtual Machine, BIOS edk2-20240524-1.el9 05/24/2024\npstate: 83400005 (Nzcv daif +PAN -UAO +TC\n---truncated---" |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "include/linux/pagemap.h" |
| ], |
| "versions": [ |
| { |
| "version": "793917d997df2e432f3e9ac126e4482d68256d01", |
| "lessThan": "a0c42ddd0969fdc760a85e20e267776028a7ca4e", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "793917d997df2e432f3e9ac126e4482d68256d01", |
| "lessThan": "333c5539a31f48828456aa9997ec2808f06a699a", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "793917d997df2e432f3e9ac126e4482d68256d01", |
| "lessThan": "099d90642a711caae377f53309abfe27e8724a8b", |
| "status": "affected", |
| "versionType": "git" |
| } |
| ] |
| }, |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "affected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "include/linux/pagemap.h" |
| ], |
| "versions": [ |
| { |
| "version": "5.18", |
| "status": "affected" |
| }, |
| { |
| "version": "0", |
| "lessThan": "5.18", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.6.41", |
| "lessThanOrEqual": "6.6.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.9.10", |
| "lessThanOrEqual": "6.9.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.10", |
| "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": "5.18", |
| "versionEndExcluding": "6.6.41" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "5.18", |
| "versionEndExcluding": "6.9.10" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "5.18", |
| "versionEndExcluding": "6.10" |
| } |
| ] |
| } |
| ] |
| } |
| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/a0c42ddd0969fdc760a85e20e267776028a7ca4e" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/333c5539a31f48828456aa9997ec2808f06a699a" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/099d90642a711caae377f53309abfe27e8724a8b" |
| } |
| ], |
| "title": "mm/filemap: make MAX_PAGECACHE_ORDER acceptable to xarray", |
| "x_generator": { |
| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2024-42243", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
