CVE-2024-44972 Affecting gfs2-kmp-default package, versions <5.14.21-150500.55.83.1
Threat Intelligence
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Test your applications- Snyk IDSNYK-SLES155-GFS2KMPDEFAULT-8174790
- published10 Oct 2024
- disclosed9 Oct 2024
Introduced: 9 Oct 2024
CVE-2024-44972 (opens in a new tab)How to fix?
Upgrade SLES:15.5 gfs2-kmp-default to version 5.14.21-150500.55.83.1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream gfs2-kmp-default package and not the gfs2-kmp-default package as distributed by SLES.
See How to fix? for SLES:15.5 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
btrfs: do not clear page dirty inside extent_write_locked_range()
[BUG] For subpage + zoned case, the following workload can lead to rsv data leak at unmount time:
mkfs.btrfs -f -s 4k $dev
mount $dev $mnt
fsstress -w -n 8 -d $mnt -s 1709539240
0/0: fiemap - no filename 0/1: copyrange read - no filename 0/2: write - no filename 0/3: rename - no source filename 0/4: creat f0 x:0 0 0 0/4: creat add id=0,parent=-1 0/5: writev f0[259 1 0 0 0 0] [778052,113,965] 0 0/6: ioctl(FIEMAP) f0[259 1 0 0 224 887097] [1294220,2291618343991484791,0x10000] -1 0/7: dwrite - xfsctl(XFS_IOC_DIOINFO) f0[259 1 0 0 224 887097] return 25, fallback to stat() 0/7: dwrite f0[259 1 0 0 224 887097] [696320,102400] 0
umount $mnt
The dmesg includes the following rsv leak detection warning (all call trace skipped):
------------[ cut here ]------------ WARNING: CPU: 2 PID: 4528 at fs/btrfs/inode.c:8653 btrfs_destroy_inode+0x1e0/0x200 [btrfs] ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ WARNING: CPU: 2 PID: 4528 at fs/btrfs/inode.c:8654 btrfs_destroy_inode+0x1a8/0x200 [btrfs] ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ WARNING: CPU: 2 PID: 4528 at fs/btrfs/inode.c:8660 btrfs_destroy_inode+0x1a0/0x200 [btrfs] ---[ end trace 0000000000000000 ]--- BTRFS info (device sda): last unmount of filesystem 1b4abba9-de34-4f07-9e7f-157cf12a18d6 ------------[ cut here ]------------ WARNING: CPU: 3 PID: 4528 at fs/btrfs/block-group.c:4434 btrfs_free_block_groups+0x338/0x500 [btrfs] ---[ end trace 0000000000000000 ]--- BTRFS info (device sda): space_info DATA has 268218368 free, is not full BTRFS info (device sda): space_info total=268435456, used=204800, pinned=0, reserved=0, may_use=12288, readonly=0 zone_unusable=0 BTRFS info (device sda): global_block_rsv: size 0 reserved 0 BTRFS info (device sda): trans_block_rsv: size 0 reserved 0 BTRFS info (device sda): chunk_block_rsv: size 0 reserved 0 BTRFS info (device sda): delayed_block_rsv: size 0 reserved 0 BTRFS info (device sda): delayed_refs_rsv: size 0 reserved 0 ------------[ cut here ]------------ WARNING: CPU: 3 PID: 4528 at fs/btrfs/block-group.c:4434 btrfs_free_block_groups+0x338/0x500 [btrfs] ---[ end trace 0000000000000000 ]--- BTRFS info (device sda): space_info METADATA has 267796480 free, is not full BTRFS info (device sda): space_info total=268435456, used=131072, pinned=0, reserved=0, may_use=262144, readonly=0 zone_unusable=245760 BTRFS info (device sda): global_block_rsv: size 0 reserved 0 BTRFS info (device sda): trans_block_rsv: size 0 reserved 0 BTRFS info (device sda): chunk_block_rsv: size 0 reserved 0 BTRFS info (device sda): delayed_block_rsv: size 0 reserved 0 BTRFS info (device sda): delayed_refs_rsv: size 0 reserved 0
Above $dev is a tcmu-runner emulated zoned HDD, which has a max zone append size of 64K, and the system has 64K page size.
[CAUSE] I have added several trace_printk() to show the events (header skipped):
> btrfs_dirty_pages: r/i=5/259 dirty start=774144 len=114688 > btrfs_dirty_pages: r/i=5/259 dirty part of page=720896 off_in_page=53248 len_in_page=12288 > btrfs_dirty_pages: r/i=5/259 dirty part of page=786432 off_in_page=0 len_in_page=65536 > btrfs_dirty_pages: r/i=5/259 dirty part of page=851968 off_in_page=0 len_in_page=36864
The above lines show our buffered write has dirtied 3 pages of inode 259 of root 5:
704K 768K 832K 896K I |////I/////////////////I///////////| I 756K 868K
|///| is the dirtied range using subpage bitmaps. and 'I' is the page boundary.
Meanwhile all three pages (704K, 768K, 832K) have their PageDirty flag set.
> btrfs_direct_write: r/i=5/259 start dio filepos=696320 len=102400
Then direct IO writ ---truncated---
References
- https://www.suse.com/security/cve/CVE-2024-44972.html
- https://bugzilla.suse.com/1230212
- https://git.kernel.org/stable/c/97713b1a2ced1e4a2a6c40045903797ebd44d7e0
- https://git.kernel.org/stable/c/ba4dedb71356638d8284e34724daca944be70368
- https://git.kernel.org/stable/c/d3b403209f767e5857c1b9fda66726e6e6ffc99f