CVE - CVE-2022-49347

CVE-ID
CVE-2022-49347	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix bug_on in ext4_writepages we got issue as follows: EXT4-fs error (device loop0): ext4_mb_generate_buddy:1141: group 0, block bitmap and bg descriptor inconsistent: 25 vs 31513 free cls ------------[ cut here ]------------ kernel BUG at fs/ext4/inode.c:2708! invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 2 PID: 2147 Comm: rep Not tainted 5.18.0-rc2-next-20220413+ #155 RIP: 0010:ext4_writepages+0x1977/0x1c10 RSP: 0018:ffff88811d3e7880 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff88811c098000 RDX: 0000000000000000 RSI: ffff88811c098000 RDI: 0000000000000002 RBP: ffff888128140f50 R08: ffffffffb1ff6387 R09: 0000000000000000 R10: 0000000000000007 R11: ffffed10250281ea R12: 0000000000000001 R13: 00000000000000a4 R14: ffff88811d3e7bb8 R15: ffff888128141028 FS: 00007f443aed9740(0000) GS:ffff8883aef00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020007200 CR3: 000000011c2a4000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> do_writepages+0x130/0x3a0 filemap_fdatawrite_wbc+0x83/0xa0 filemap_flush+0xab/0xe0 ext4_alloc_da_blocks+0x51/0x120 __ext4_ioctl+0x1534/0x3210 __x64_sys_ioctl+0x12c/0x170 do_syscall_64+0x3b/0x90 It may happen as follows: 1. write inline_data inode vfs_write new_sync_write ext4_file_write_iter ext4_buffered_write_iter generic_perform_write ext4_da_write_begin ext4_da_write_inline_data_begin -> If inline data size too small will allocate block to write, then mapping will has dirty page ext4_da_convert_inline_data_to_extent ->clear EXT4_STATE_MAY_INLINE_DATA 2. fallocate do_vfs_ioctl ioctl_preallocate vfs_fallocate ext4_fallocate ext4_convert_inline_data ext4_convert_inline_data_nolock ext4_map_blocks -> fail will goto restore data ext4_restore_inline_data ext4_create_inline_data ext4_write_inline_data ext4_set_inode_state -> set inode EXT4_STATE_MAY_INLINE_DATA 3. writepages __ext4_ioctl ext4_alloc_da_blocks filemap_flush filemap_fdatawrite_wbc do_writepages ext4_writepages if (ext4_has_inline_data(inode)) BUG_ON(ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) The root cause of this issue is we destory inline data until call ext4_writepages under delay allocation mode. But there maybe already convert from inline to extent. To solve this issue, we call filemap_flush first..
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/013f12bdedb96816aaa27ee04349f4433d361f52 URL:https://git.kernel.org/stable/c/013f12bdedb96816aaa27ee04349f4433d361f52 MISC:https://git.kernel.org/stable/c/18a759f7f99f0b65a08ff5b7e745fc405a42bde4 URL:https://git.kernel.org/stable/c/18a759f7f99f0b65a08ff5b7e745fc405a42bde4 MISC:https://git.kernel.org/stable/c/19918ec7717d87d5ab825884a46b26b21375d7ce URL:https://git.kernel.org/stable/c/19918ec7717d87d5ab825884a46b26b21375d7ce MISC:https://git.kernel.org/stable/c/1b061af037646c9cdb0afd8a8d2f1e1c06285866 URL:https://git.kernel.org/stable/c/1b061af037646c9cdb0afd8a8d2f1e1c06285866 MISC:https://git.kernel.org/stable/c/1cde35417edc0370fb0179a4e38b78a15350a8d0 URL:https://git.kernel.org/stable/c/1cde35417edc0370fb0179a4e38b78a15350a8d0 MISC:https://git.kernel.org/stable/c/73fd5b19285197078ee8a2e651d75d5b094a4de9 URL:https://git.kernel.org/stable/c/73fd5b19285197078ee8a2e651d75d5b094a4de9 MISC:https://git.kernel.org/stable/c/b2b78f5bf2d453dda3903955efee059260787a42 URL:https://git.kernel.org/stable/c/b2b78f5bf2d453dda3903955efee059260787a42 MISC:https://git.kernel.org/stable/c/de1732b5c1693ad489c5d254f124f67cb775f37d URL:https://git.kernel.org/stable/c/de1732b5c1693ad489c5d254f124f67cb775f37d MISC:https://git.kernel.org/stable/c/ef09ed5d37b84d18562b30cf7253e57062d0db05 URL:https://git.kernel.org/stable/c/ef09ed5d37b84d18562b30cf7253e57062d0db05
Assigning CNA
kernel.org
Date Record Created
20250226	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20250226)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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