{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"MEDIUM" }, "category":"csaf_vex", "csaf_version":"2.0", "distribution":{ "tlp":{ "label":"WHITE", "url":"https:/www.first.org/tlp/" } }, "lang":"en", "notes":[ { "text":"In the Linux kernel, the following vulnerability has been resolved:mm/filemap: make MAX_PAGECACHE_ORDER acceptable to xarrayPatch series mm/filemap: Limit page cache size to that supported byxarray , v2.Currently, xarray can t support arbitrary page cache size. More detailscan be found from the WARN_ON() statement in xas_split_alloc(). In ourtest whose code is attached below, we hit the WARN_ON() on ARM64 systemwhere the base page size is 64KB and huge page size is 512MB. The issuewas reported long time ago and some discussions on it can be found here[1].[1] https://www.spinics.net/lists/linux-xfs/msg75404.htmlIn order to fix the issue, we need to adjust MAX_PAGECACHE_ORDER to onesupported by xarray and avoid PMD-sized page cache if needed. The codechanges are suggested by David Hildenbrand.PATCH[1] adjusts MAX_PAGECACHE_ORDER to that supported by xarrayPATCH[2-3] avoids PMD-sized page cache in the synchronous readahead pathPATCH[4] avoids PMD-sized page cache for shmem files if neededTest program============# cat test.c#define _GNU_SOURCE#include #include #include #include #include #include #include #include #define TEST_XFS_FILENAME /tmp/data #define TEST_SHMEM_FILENAME /dev/shm/data #define TEST_MEM_SIZE 0x20000000int main(int argc, char **argv){ const char *filename; int fd = 0; void *buf = (void *)-1, *p; int pgsize = getpagesize(); int ret; if (pgsize != 0x10000) { fprintf(stderr, 64KB base page size is required n ); return -EPERM; } system( echo force > /sys/kernel/mm/transparent_hugepage/shmem_enabled ); system( rm -fr /tmp/data ); system( rm -fr /dev/shm/data ); system( echo 1 > /proc/sys/vm/drop_caches ); /* Open xfs or shmem file */ filename = TEST_XFS_FILENAME; if (argc > 1 && !strcmp(argv[1], shmem )) filename = TEST_SHMEM_FILENAME; fd = open(filename, O_CREAT | O_RDWR | O_TRUNC); if (fd < 0) { fprintf(stderr, Unable to open <%s> n , filename); return -EIO; } /* Extend file size */ ret = ftruncate(fd, TEST_MEM_SIZE); if (ret) { fprintf(stderr, Error %d to ftruncate() n , ret); goto cleanup; } /* Create VMA */ buf = mmap(NULL, TEST_MEM_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); if (buf == (void *)-1) { fprintf(stderr, Unable to mmap <%s> n , filename); goto cleanup; } fprintf(stdout, mapped buffer at 0x%p n , buf); ret = madvise(buf, TEST_MEM_SIZE, MADV_HUGEPAGE); if (ret) { fprintf(stderr, Unable to madvise(MADV_HUGEPAGE) n ); goto cleanup; } /* Populate VMA */ ret = madvise(buf, TEST_MEM_SIZE, MADV_POPULATE_WRITE); if (ret) { fprintf(stderr, Error %d to madvise(MADV_POPULATE_WRITE) n , ret); goto cleanup; } /* Punch the file to enforce xarray split */ ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE, TEST_MEM_SIZE - pgsize, pgsize); if (ret) fprintf(stderr, Error %d to fallocate() n , ret);cleanup: if (buf != (void *)-1) munmap(buf, TEST_MEM_SIZE); if (fd > 0) close(fd); return 0;}# gcc test.c -o test# cat /proc/1/smaps | grep KernelPageSize | head -n 1KernelPageSize: 64 kB# ./test shmem :------------[ cut here ]------------WARNING: CPU: 17 PID: 5253 at lib/xarray.c:1025 xas_split_alloc+0xf8/0x128Modules linked in: nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set nf_tables rfkill nfnetlink vfat fat virtio_balloon drm fuse xfs libcrc32c crct10dif_ce ghash_ce sha2_ce sha256_arm64 virtio_net sha1_ce net_failover failover virtio_console virtio_blk dimlib virtio_mmioCPU: 17 PID: 5253 Comm: test Kdump: loaded Tainted: G W 6.10.0-rc5-gavin+ #12Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20240524-1.el9 05/24/2024pstate: 83400005 (Nzcv daif +PAN -UAO +TC---truncated---", "category":"general", "title":"Synopsis" } ], "publisher":{ "issuing_authority":"openEuler security committee", "name":"openEuler", "namespace":"https://www.openeuler.org", "contact_details":"openeuler-security@openeuler.org", "category":"vendor" }, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2024-42243" }, { "summary":"CVE-2024-42243 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2024/csaf-openeuler-cve-2024-42243.json" }, { "summary":"openEuler-SA-2024-2124", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2024-2124" }, { "summary":"CVE-2024-42243", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2024-42243&packageName=kernel" } ], "title":"openEuler cve CVE-2024-42243", "tracking":{ "initial_release_date":"2024-09-14T20:21:42+08:00", "revision_history":[ { "date":"2024-09-14T20:21:42+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2024-09-14T20:21:42+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2024-09-14T20:21:42+08:00", "id":"CVE-2024-42243", "version":"1.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { "name":"openEuler", "category":"vendor", "branches":[ { "name":"openEuler", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:24.03-LTS" }, "product_id":"openEuler-24.03-LTS", "name":"openEuler-24.03-LTS" }, "name":"openEuler-24.03-LTS", "category":"product_version" } ], "category":"product_name" }, { "name":"aarch64", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:24.03-LTS" }, "product_id":"bpftool-6.6.0-41.0.0.48.oe2403.aarch64.rpm", "name":"bpftool-6.6.0-41.0.0.48.oe2403.aarch64.rpm" }, "name":"bpftool-6.6.0-41.0.0.48.oe2403.aarch64.rpm", "category":"product_version" }, { "product":{ 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More detailscan be found from the WARN_ON() statement in xas_split_alloc(). In ourtest whose code is attached below, we hit the WARN_ON() on ARM64 systemwhere the base page size is 64KB and huge page size is 512MB. The issuewas reported long time ago and some discussions on it can be found here[1].[1] https://www.spinics.net/lists/linux-xfs/msg75404.htmlIn order to fix the issue, we need to adjust MAX_PAGECACHE_ORDER to onesupported by xarray and avoid PMD-sized page cache if needed. The codechanges are suggested by David Hildenbrand.PATCH[1] adjusts MAX_PAGECACHE_ORDER to that supported by xarrayPATCH[2-3] avoids PMD-sized page cache in the synchronous readahead pathPATCH[4] avoids PMD-sized page cache for shmem files if neededTest program============# cat test.c#define _GNU_SOURCE#include #include #include #include #include #include #include #include #define TEST_XFS_FILENAME /tmp/data #define TEST_SHMEM_FILENAME /dev/shm/data #define TEST_MEM_SIZE 0x20000000int main(int argc, char **argv){ const char *filename; int fd = 0; void *buf = (void *)-1, *p; int pgsize = getpagesize(); int ret; if (pgsize != 0x10000) { fprintf(stderr, 64KB base page size is required n ); return -EPERM; } system( echo force > /sys/kernel/mm/transparent_hugepage/shmem_enabled ); system( rm -fr /tmp/data ); system( rm -fr /dev/shm/data ); system( echo 1 > /proc/sys/vm/drop_caches ); /* Open xfs or shmem file */ filename = TEST_XFS_FILENAME; if (argc > 1 && !strcmp(argv[1], shmem )) filename = TEST_SHMEM_FILENAME; fd = open(filename, O_CREAT | O_RDWR | O_TRUNC); if (fd < 0) { fprintf(stderr, Unable to open <%s> n , filename); return -EIO; } /* Extend file size */ ret = ftruncate(fd, TEST_MEM_SIZE); if (ret) { fprintf(stderr, Error %d to ftruncate() n , ret); goto cleanup; } /* Create VMA */ buf = mmap(NULL, TEST_MEM_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); if (buf == (void *)-1) { fprintf(stderr, Unable to mmap <%s> n , filename); goto cleanup; } fprintf(stdout, mapped buffer at 0x%p n , buf); ret = madvise(buf, TEST_MEM_SIZE, MADV_HUGEPAGE); if (ret) { fprintf(stderr, Unable to madvise(MADV_HUGEPAGE) n ); goto cleanup; } /* Populate VMA */ ret = madvise(buf, TEST_MEM_SIZE, MADV_POPULATE_WRITE); if (ret) { fprintf(stderr, Error %d to madvise(MADV_POPULATE_WRITE) n , ret); goto cleanup; } /* Punch the file to enforce xarray split */ ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE, TEST_MEM_SIZE - pgsize, pgsize); if (ret) fprintf(stderr, Error %d to fallocate() n , ret);cleanup: if (buf != (void *)-1) munmap(buf, TEST_MEM_SIZE); if (fd > 0) close(fd); return 0;}# gcc test.c -o test# cat /proc/1/smaps | grep KernelPageSize | head -n 1KernelPageSize: 64 kB# ./test shmem :------------[ cut here ]------------WARNING: CPU: 17 PID: 5253 at lib/xarray.c:1025 xas_split_alloc+0xf8/0x128Modules linked in: nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set nf_tables rfkill nfnetlink vfat fat virtio_balloon drm fuse xfs libcrc32c crct10dif_ce ghash_ce sha2_ce sha256_arm64 virtio_net sha1_ce net_failover failover virtio_console virtio_blk dimlib virtio_mmioCPU: 17 PID: 5253 Comm: test Kdump: loaded Tainted: G W 6.10.0-rc5-gavin+ #12Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20240524-1.el9 05/24/2024pstate: 83400005 (Nzcv daif +PAN -UAO +TC---truncated---", "category":"description", 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"category":"impact" } ], "title":"CVE-2024-42243" } ] }