The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - mm/filemap: make MAX_PAGECACHE_ORDER acceptable to xarray Patch series mm/filemap: Limit page cache size     to that supported by xarray, v2. Currently, xarray can't support arbitrary page cache size. More details     can be found from the WARN_ON() statement in xas_split_alloc(). In our test whose code is attached below,     we hit the WARN_ON() on ARM64 system where the base page size is 64KB and huge page size is 512MB. The     issue was reported long time ago and some discussions on it can be found here [1]. [1]     https://www.spinics.net/lists/linux-xfs/msg75404.html In order to fix the issue, we need to adjust     MAX_PAGECACHE_ORDER to one supported by xarray and avoid PMD-sized page cache if needed. The code changes     are suggested by David Hildenbrand. PATCH[1] adjusts MAX_PAGECACHE_ORDER to that supported by xarray     PATCH[2-3] avoids PMD-sized page cache in the synchronous readahead path PATCH[4] avoids PMD-sized page     cache for shmem files if needed Test program ============ # cat test.c #define _GNU_SOURCE #include     <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #include <fcntl.h> #include     <errno.h> #include <sys/syscall.h> #include <sys/mman.h> #define TEST_XFS_FILENAME /tmp/data #define     TEST_SHMEM_FILENAME /dev/shm/data #define TEST_MEM_SIZE 0x20000000 int 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 1 KernelPageSize: 64     kB # ./test shmem : ------------[ cut here ]------------ WARNING: CPU: 17 PID: 5253 at lib/xarray.c:1025     xas_split_alloc+0xf8/0x128 Modules 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_mmio CPU: 17 PID: 5253 Comm: test Kdump: loaded Tainted: G W     6.10.0-rc5-gavin+ #12 Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20240524-1.el9 05/24/2024 pstate:
    83400005 (Nzcv daif +PAN -UAO +TC ---truncated--- (CVE-2024-42243)

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Linux Distros Unpatched Vulnerability : CVE-2024-42243

medium Nessus Plugin ID 229329

Version 1.6