CVE - CVE-2021-47007

CVE-ID
CVE-2021-47007	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: f2fs: fix panic during f2fs_resize_fs() f2fs_resize_fs() hangs in below callstack with testcase: - mkfs 16GB image & mount image - dd 8GB fileA - dd 8GB fileB - sync - rm fileA - sync - resize filesystem to 8GB kernel BUG at segment.c:2484! Call Trace: allocate_segment_by_default+0x92/0xf0 [f2fs] f2fs_allocate_data_block+0x44b/0x7e0 [f2fs] do_write_page+0x5a/0x110 [f2fs] f2fs_outplace_write_data+0x55/0x100 [f2fs] f2fs_do_write_data_page+0x392/0x850 [f2fs] move_data_page+0x233/0x320 [f2fs] do_garbage_collect+0x14d9/0x1660 [f2fs] free_segment_range+0x1f7/0x310 [f2fs] f2fs_resize_fs+0x118/0x330 [f2fs] __f2fs_ioctl+0x487/0x3680 [f2fs] __x64_sys_ioctl+0x8e/0xd0 do_syscall_64+0x33/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The root cause is we forgot to check that whether we have enough space in resized filesystem to store all valid blocks in before-resizing filesystem, then allocator will run out-of-space during block migration in free_segment_range().
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/1c20a4896409f5ca1c770e1880c33d0a28a8b10f URL:https://git.kernel.org/stable/c/1c20a4896409f5ca1c770e1880c33d0a28a8b10f MISC:https://git.kernel.org/stable/c/3ab0598e6d860ef49d029943ba80f627c15c15d6 URL:https://git.kernel.org/stable/c/3ab0598e6d860ef49d029943ba80f627c15c15d6 MISC:https://git.kernel.org/stable/c/822054e5026c43b1dd60cf387dd999e95ee2ecc2 URL:https://git.kernel.org/stable/c/822054e5026c43b1dd60cf387dd999e95ee2ecc2 MISC:https://git.kernel.org/stable/c/860afd680d9cc1dabd61cda3cd246f60aa1eb705 URL:https://git.kernel.org/stable/c/860afd680d9cc1dabd61cda3cd246f60aa1eb705
Assigning CNA
kernel.org
Date Record Created
20240227	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 (20240227)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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