{"uuid": "ad583958-be9c-44a0-8221-31974090845d", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "2a075640-a300-48a4-bb44-bc6130783b9b", "vulnerability": "CVE-2024-44972", "type": "seen", "source": "https://t.me/cvedetector/4831", "content": "{\n  \"Source\": \"CVE FEED\",\n  \"Title\": \"CVE-2024-44972 - Linux Btrfs RSV Data Leak\", \n  \"Content\": \"CVE ID : CVE-2024-44972 \nPublished : Sept. 4, 2024, 7:15 p.m. | 36\u00a0minutes ago \nDescription : In the Linux kernel, the following vulnerability has been resolved:  \n  \nbtrfs: do not clear page dirty inside extent_write_locked_range()  \n  \n[BUG]  \nFor subpage + zoned case, the following workload can lead to rsv data  \nleak at unmount time:  \n  \n  # mkfs.btrfs -f -s 4k $dev  \n  # mount $dev $mnt  \n  # fsstress -w -n 8 -d $mnt -s 1709539240  \n  0/0: fiemap - no filename  \n  0/1: copyrange read - no filename  \n  0/2: write - no filename  \n  0/3: rename - no source filename  \n  0/4: creat f0 x:0 0 0  \n  0/4: creat add id=0,parent=-1  \n  0/5: writev f0[259 1 0 0 0 0] [778052,113,965] 0  \n  0/6: ioctl(FIEMAP) f0[259 1 0 0 224 887097] [1294220,2291618343991484791,0x10000] -1  \n  0/7: dwrite - xfsctl(XFS_IOC_DIOINFO) f0[259 1 0 0 224 887097] return 25, fallback to stat()  \n  0/7: dwrite f0[259 1 0 0 224 887097] [696320,102400] 0  \n  # umount $mnt  \n  \nThe dmesg includes the following rsv leak detection warning (all call  \ntrace skipped):  \n  \n  ------------[ cut here ]------------  \n  WARNING: CPU: 2 PID: 4528 at fs/btrfs/inode.c:8653 btrfs_destroy_inode+0x1e0/0x200 [btrfs]  \n  ---[ end trace 0000000000000000 ]---  \n  ------------[ cut here ]------------  \n  WARNING: CPU: 2 PID: 4528 at fs/btrfs/inode.c:8654 btrfs_destroy_inode+0x1a8/0x200 [btrfs]  \n  ---[ end trace 0000000000000000 ]---  \n  ------------[ cut here ]------------  \n  WARNING: CPU: 2 PID: 4528 at fs/btrfs/inode.c:8660 btrfs_destroy_inode+0x1a0/0x200 [btrfs]  \n  ---[ end trace 0000000000000000 ]---  \n  BTRFS info (device sda): last unmount of filesystem 1b4abba9-de34-4f07-9e7f-157cf12a18d6  \n  ------------[ cut here ]------------  \n  WARNING: CPU: 3 PID: 4528 at fs/btrfs/block-group.c:4434 btrfs_free_block_groups+0x338/0x500 [btrfs]  \n  ---[ end trace 0000000000000000 ]---  \n  BTRFS info (device sda): space_info DATA has 268218368 free, is not full  \n  BTRFS info (device sda): space_info total=268435456, used=204800, pinned=0, reserved=0, may_use=12288, readonly=0 zone_unusable=0  \n  BTRFS info (device sda): global_block_rsv: size 0 reserved 0  \n  BTRFS info (device sda): trans_block_rsv: size 0 reserved 0  \n  BTRFS info (device sda): chunk_block_rsv: size 0 reserved 0  \n  BTRFS info (device sda): delayed_block_rsv: size 0 reserved 0  \n  BTRFS info (device sda): delayed_refs_rsv: size 0 reserved 0  \n  ------------[ cut here ]------------  \n  WARNING: CPU: 3 PID: 4528 at fs/btrfs/block-group.c:4434 btrfs_free_block_groups+0x338/0x500 [btrfs]  \n  ---[ end trace 0000000000000000 ]---  \n  BTRFS info (device sda): space_info METADATA has 267796480 free, is not full  \n  BTRFS info (device sda): space_info total=268435456, used=131072, pinned=0, reserved=0, may_use=262144, readonly=0 zone_unusable=245760  \n  BTRFS info (device sda): global_block_rsv: size 0 reserved 0  \n  BTRFS info (device sda): trans_block_rsv: size 0 reserved 0  \n  BTRFS info (device sda): chunk_block_rsv: size 0 reserved 0  \n  BTRFS info (device sda): delayed_block_rsv: size 0 reserved 0  \n  BTRFS info (device sda): delayed_refs_rsv: size 0 reserved 0  \n  \nAbove $dev is a tcmu-runner emulated zoned HDD, which has a max zone  \nappend size of 64K, and the system has 64K page size.  \n  \n[CAUSE]  \nI have added several trace_printk() to show the events (header skipped):  \n  \n  > btrfs_dirty_pages: r/i=5/259 dirty start=774144 len=114688  \n  > btrfs_dirty_pages: r/i=5/259 dirty part of page=720896 off_in_page=53248 len_in_page=12288  \n  > btrfs_dirty_pages: r/i=5/259 dirty part of page=786432 off_in_page=0 len_in_page=65536  \n  > btrfs_dirty_pages: r/i=5/259 dirty part of page=851968 off_in_page=0 len_in_page=36864  \n  \nThe above lines show our buffered write has dirtied 3 pages of inode  \n259 of root 5:  \n  \n  704K             768K              832K              896K  \n  I           |////I/////////////////I///////////|     I  \n              756K                     [...]", "creation_timestamp": "2024-09-04T21:56:06.000000Z"}