Description

In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix NULL pointer dereference in nilfs_palloc_commit_free_entry() Syzbot reported a null-ptr-deref bug: NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 1 PID: 3603 Comm: segctord Not tainted 6.1.0-rc2-syzkaller-00105-gb229b6ca5abb #0 Hardware name: Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 RIP: 0010:nilfs_palloc_commit_free_entry+0xe5/0x6b0 fs/nilfs2/alloc.c:608 Code: 00 00 00 00 fc ff df 80 3c 02 00 0f 85 cd 05 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 73 08 49 8d 7e 10 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 26 05 00 00 49 8b 46 10 be a6 00 00 00 48 c7 c7 RSP: 0018:ffffc90003dff830 EFLAGS: 00010212 RAX: dffffc0000000000 RBX: ffff88802594e218 RCX: 000000000000000d RDX: 0000000000000002 RSI: 0000000000002000 RDI: 0000000000000010 RBP: ffff888071880222 R08: 0000000000000005 R09: 000000000000003f R10: 000000000000000d R11: 0000000000000000 R12: ffff888071880158 R13: ffff88802594e220 R14: 0000000000000000 R15: 0000000000000004 FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb1c08316a8 CR3: 0000000018560000 CR4: 0000000000350ee0 Call Trace: <TASK> nilfs_dat_commit_free fs/nilfs2/dat.c:114 [inline] nilfs_dat_commit_end+0x464/0x5f0 fs/nilfs2/dat.c:193 nilfs_dat_commit_update+0x26/0x40 fs/nilfs2/dat.c:236 nilfs_btree_commit_update_v+0x87/0x4a0 fs/nilfs2/btree.c:1940 nilfs_btree_commit_propagate_v fs/nilfs2/btree.c:2016 [inline] nilfs_btree_propagate_v fs/nilfs2/btree.c:2046 [inline] nilfs_btree_propagate+0xa00/0xd60 fs/nilfs2/btree.c:2088 nilfs_bmap_propagate+0x73/0x170 fs/nilfs2/bmap.c:337 nilfs_collect_file_data+0x45/0xd0 fs/nilfs2/segment.c:568 nilfs_segctor_apply_buffers+0x14a/0x470 fs/nilfs2/segment.c:1018 nilfs_segctor_scan_file+0x3f4/0x6f0 fs/nilfs2/segment.c:1067 nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1197 [inline] nilfs_segctor_collect fs/nilfs2/segment.c:1503 [inline] nilfs_segctor_do_construct+0x12fc/0x6af0 fs/nilfs2/segment.c:2045 nilfs_segctor_construct+0x8e3/0xb30 fs/nilfs2/segment.c:2379 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2487 [inline] nilfs_segctor_thread+0x3c3/0xf30 fs/nilfs2/segment.c:2570 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 </TASK> ... If DAT metadata file is corrupted on disk, there is a case where req->pr_desc_bh is NULL and blocknr is 0 at nilfs_dat_commit_end() during a b-tree operation that cascadingly updates ancestor nodes of the b-tree, because nilfs_dat_commit_alloc() for a lower level block can initialize the blocknr on the same DAT entry between nilfs_dat_prepare_end() and nilfs_dat_commit_end(). If this happens, nilfs_dat_commit_end() calls nilfs_dat_commit_free() without valid buffer heads in req->pr_desc_bh and req->pr_bitmap_bh, and causes the NULL pointer dereference above in nilfs_palloc_commit_free_entry() function, which leads to a crash. Fix this by adding a NULL check on req->pr_desc_bh and req->pr_bitmap_bh before nilfs_palloc_commit_free_entry() in nilfs_dat_commit_free(). This also calls nilfs_error() in that case to notify that there is a fatal flaw in the filesystem metadata and prevent further operations.

Metrics

 

CVSS Version 4.0 CVSS Version 3.x CVSS Version 2.0

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CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

NIST: NVD

Base Score:  5.5 MEDIUM

Vector:  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS 2.0 Severity and Vector Strings:

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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Hyperlink	Resource
https://git.kernel.org/stable/c/165c7a3b27a3857ebf57f626b9f38b48b6792e68	Patch
https://git.kernel.org/stable/c/2f2c59506ae39496588ceb8b88bdbdbaed895d63	Patch
https://git.kernel.org/stable/c/33021419fd81efd3d729a7f19341ba4b98fe66ce	Patch
https://git.kernel.org/stable/c/381b84f60e549ea98cec4666c6c728b1b3318756	Patch
https://git.kernel.org/stable/c/9a130b72e6bd1fb07fc3cde839dc6fb53da76f07	Patch
https://git.kernel.org/stable/c/bc3fd3293887b4cf84a9109700faeb82de533c89	Patch
https://git.kernel.org/stable/c/e858917ab785afe83c14f5ac141301216ccda847	Patch
https://git.kernel.org/stable/c/f0a0ccda18d6fd826d7c7e7ad48a6ed61c20f8b4	Patch

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-476	NULL Pointer Dereference	NIST

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Change History

2 change records found show changes

Initial Analysis by NIST 10/25/2024 10:35:25 AM

Action	Type	Old Value	New Value
Added	CVSS V3.1		NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Added	CWE		NIST CWE-476
Added	CPE Configuration		Record truncated, showing 500 of 1122 characters. View Entire Change Record OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 4.9.335 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.10 up to (excluding) 4.14.301 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.15 up to (excluding) 4.19.268 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.20 up to (excluding) 5.4.226 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up t
Changed	Reference Type	https://git.kernel.org/stable/c/165c7a3b27a3857ebf57f626b9f38b48b6792e68 No Types Assigned	https://git.kernel.org/stable/c/165c7a3b27a3857ebf57f626b9f38b48b6792e68 Patch
Changed	Reference Type	https://git.kernel.org/stable/c/2f2c59506ae39496588ceb8b88bdbdbaed895d63 No Types Assigned	https://git.kernel.org/stable/c/2f2c59506ae39496588ceb8b88bdbdbaed895d63 Patch
Changed	Reference Type	https://git.kernel.org/stable/c/33021419fd81efd3d729a7f19341ba4b98fe66ce No Types Assigned	https://git.kernel.org/stable/c/33021419fd81efd3d729a7f19341ba4b98fe66ce Patch
Changed	Reference Type	https://git.kernel.org/stable/c/381b84f60e549ea98cec4666c6c728b1b3318756 No Types Assigned	https://git.kernel.org/stable/c/381b84f60e549ea98cec4666c6c728b1b3318756 Patch
Changed	Reference Type	https://git.kernel.org/stable/c/9a130b72e6bd1fb07fc3cde839dc6fb53da76f07 No Types Assigned	https://git.kernel.org/stable/c/9a130b72e6bd1fb07fc3cde839dc6fb53da76f07 Patch
Changed	Reference Type	https://git.kernel.org/stable/c/bc3fd3293887b4cf84a9109700faeb82de533c89 No Types Assigned	https://git.kernel.org/stable/c/bc3fd3293887b4cf84a9109700faeb82de533c89 Patch
Changed	Reference Type	https://git.kernel.org/stable/c/e858917ab785afe83c14f5ac141301216ccda847 No Types Assigned	https://git.kernel.org/stable/c/e858917ab785afe83c14f5ac141301216ccda847 Patch
Changed	Reference Type	https://git.kernel.org/stable/c/f0a0ccda18d6fd826d7c7e7ad48a6ed61c20f8b4 No Types Assigned	https://git.kernel.org/stable/c/f0a0ccda18d6fd826d7c7e7ad48a6ed61c20f8b4 Patch

New CVE Received from kernel.org 10/21/2024 4:15:12 PM

Action	Type	Old Value	New Value
Added	Description		Record truncated, showing 500 of 3581 characters. View Entire Change Record In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix NULL pointer dereference in nilfs_palloc_commit_free_entry() Syzbot reported a null-ptr-deref bug: NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 1 PID: 3603 Comm: segctord Not t
Added	Reference		kernel.org https://git.kernel.org/stable/c/165c7a3b27a3857ebf57f626b9f38b48b6792e68 [No types assigned]
Added	Reference		kernel.org https://git.kernel.org/stable/c/2f2c59506ae39496588ceb8b88bdbdbaed895d63 [No types assigned]
Added	Reference		kernel.org https://git.kernel.org/stable/c/33021419fd81efd3d729a7f19341ba4b98fe66ce [No types assigned]
Added	Reference		kernel.org https://git.kernel.org/stable/c/381b84f60e549ea98cec4666c6c728b1b3318756 [No types assigned]
Added	Reference		kernel.org https://git.kernel.org/stable/c/9a130b72e6bd1fb07fc3cde839dc6fb53da76f07 [No types assigned]
Added	Reference		kernel.org https://git.kernel.org/stable/c/bc3fd3293887b4cf84a9109700faeb82de533c89 [No types assigned]
Added	Reference		kernel.org https://git.kernel.org/stable/c/e858917ab785afe83c14f5ac141301216ccda847 [No types assigned]
Added	Reference		kernel.org https://git.kernel.org/stable/c/f0a0ccda18d6fd826d7c7e7ad48a6ed61c20f8b4 [No types assigned]