CVE-2024-42241 — mm/shmem: disable PMD-sized page cache if needed

Affected: Linux

In the Linux kernel, the following vulnerability has been resolved:

mm/shmem: disable PMD-sized page cache if needed

For shmem files, it's possible that PMD-sized page cache can't be supported by xarray. For example, 512MB page cache on ARM64 when the base page size is 64KB can't be supported by xarray. It leads to errors as the following messages indicate when this sort of xarray entry is split.

WARNING: CPU: 34 PID: 7578 at lib/xarray.c:1025 xas_split_alloc+0xf8/0x128 Modules linked in: binfmt_misc 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 rfkill nf_tables nfnetlink vfat fat virtio_balloon drm fuse xfs \ libcrc32c crct10dif_ce ghash_ce sha2_ce sha256_arm64 sha1_ce virtio_net \ net_failover virtio_console virtio_blk failover dimlib virtio_mmio CPU: 34 PID: 7578 Comm: test Kdump: loaded Tainted: G W 6.10.0-rc5-gavin+ #9 Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20240524-1.el9 05/24/2024 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : xas_split_alloc+0xf8/0x128 lr : split_huge_page_to_list_to_order+0x1c4/0x720 sp : ffff8000882af5f0 x29: ffff8000882af5f0 x28: ffff8000882af650 x27: ffff8000882af768 x26: 0000000000000cc0 x25: 000000000000000d x24: ffff00010625b858 x23: ffff8000882af650 x22: ffffffdfc0900000 x21: 0000000000000000 x20: 0000000000000000 x19: ffffffdfc0900000 x18: 0000000000000…

RHSA-2024:6744 — Red Hat Security Advisory: kernel security update

kernel: tty: n_gsm: require CAP_NET_ADMIN to attach N_GSM0710 ldisc kernel: Bluetooth: af_bluetooth: Fix deadlock kernel: crypto: qat - resolve race condition during AER recovery kernel: scsi: qedf: Ensure the copied buf is NUL terminated kernel: cppc_cpufreq: Fix possible null pointer dereference kernel: cpufreq: exit() callback is optional kernel: ACPICA: Revert "ACPICA: avoid Info: mapping multiple BARs. Your kernel is fine." kernel: sched/deadline: Fix task_struct reference leak kernel: mm/filemap: skip to create PMD-sized page cache if needed kernel: mm/shmem: disable PMD-sized page cache if needed kernel: mm/filemap: make MAX_PAGECACHE_ORDER acceptable to xarray kernel: net, sunrpc: Remap EPERM in case of connection failure in xs_tcp_setup_socket

Most recent entries from all

CVE-2024-42241 — mm/shmem: disable PMD-sized page cache if needed

RHSA-2024:6744 — Red Hat Security Advisory: kernel security update