Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix data race at btrfs_use_block_rsv() when accessing block reserve At btrfs_use_block_rsv() we read the size of a block reserve without locking its spinlock, which makes KCSAN complain because the size of a block reserve is always updated while holding its spinlock. The report from KCSAN is the following: [653.313148] BUG: KCSAN: data-race in btrfs_update_delayed_refs_rsv [btrfs] / btrfs_use_block_rsv [btrfs] [653.314755] read to 0x000000017f5871b8 of 8 bytes by task 7519 on cpu 0: [653.314779] btrfs_use_block_rsv+0xe4/0x2f8 [btrfs] [653.315606] btrfs_alloc_tree_block+0xdc/0x998 [btrfs] [653.316421] btrfs_force_cow_block+0x220/0xe38 [btrfs] [653.317242] btrfs_cow_block+0x1ac/0x568 [btrfs] [653.318060] btrfs_search_slot+0xda2/0x19b8 [btrfs] [653.318879] btrfs_del_csums+0x1dc/0x798 [btrfs] [653.319702] __btrfs_free_extent.isra.0+0xc24/0x2028 [btrfs] [653.320538] __btrfs_run_delayed_refs+0xd3c/0x2390 [btrfs] [653.321340] btrfs_run_delayed_refs+0xae/0x290 [btrfs] [653.322140] flush_space+0x5e4/0x718 [btrfs] [653.322958] btrfs_preempt_reclaim_metadata_space+0x102/0x2f8 [btrfs] [653.323781] process_one_work+0x3b6/0x838 [653.323800] worker_thread+0x75e/0xb10 [653.323817] kthread+0x21a/0x230 [653.323836] __ret_from_fork+0x6c/0xb8 [653.323855] ret_from_fork+0xa/0x30 [653.323887] write to 0x000000017f5871b8 of 8 bytes by task 576 on cpu 3: [653.323906] btrfs_update_delayed_refs_rsv+0x1a4/0x250 [btrfs] [653.324699] btrfs_add_delayed_data_ref+0x468/0x6d8 [btrfs] [653.325494] btrfs_free_extent+0x76/0x120 [btrfs] [653.326280] __btrfs_mod_ref+0x6a8/0x6b8 [btrfs] [653.327064] btrfs_dec_ref+0x50/0x70 [btrfs] [653.327849] walk_up_proc+0x236/0xa50 [btrfs] [653.328633] walk_up_tree+0x21c/0x448 [btrfs] [653.329418] btrfs_drop_snapshot+0x802/0x1328 [btrfs] [653.330205] btrfs_clean_one_deleted_snapshot+0x184/0x238 [btrfs] [653.330995] cleaner_kthread+0x2b0/0x2f0 [btrfs] [653.331781] kthread+0x21a/0x230 [653.331800] __ret_from_fork+0x6c/0xb8 [653.331818] ret_from_fork+0xa/0x30 So add a helper to get the size of a block reserve while holding the lock. Reading the field while holding the lock instead of using the data_race() annotation is used in order to prevent load tearing.

Severity

 

CVSS Version 3.x CVSS Version 2.0

CVSS 3.x Severity and Metrics:

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

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

CVSS 2.0 Severity and Metrics:

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have not published a CVSS score for this CVE at this time. NVD Analysts use publicly available information at the time of analysis to associate CVSS vector strings.

References to Advisories, Solutions, and Tools

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Hyperlink	Resource
https://git.kernel.org/stable/c/2daa2a8e895e6dc2395f8628c011bcf1e019040d	Patch
https://git.kernel.org/stable/c/7e9422d35d574b646269ca46010a835ca074b310	Patch
https://git.kernel.org/stable/c/ab1be3f1aa7799f99155488c28eacaef65eb68fb	Patch
https://git.kernel.org/stable/c/c7bb26b847e5b97814f522686068c5628e2b3646	Patch
https://git.kernel.org/stable/c/f6d4d29a12655b42a13cec038c2902bb7efc50ed	Patch

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-667	Improper Locking	NIST

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Change History

2 change records found show changes

Initial Analysis by NIST 4/29/2024 3:42:55 PM

Action	Type	Old Value	New Value
Added	CPE Configuration		OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 5.4.273 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 6.1.83 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.23 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.7.11
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-667
Changed	Reference Type	https://git.kernel.org/stable/c/2daa2a8e895e6dc2395f8628c011bcf1e019040d No Types Assigned	https://git.kernel.org/stable/c/2daa2a8e895e6dc2395f8628c011bcf1e019040d Patch
Changed	Reference Type	https://git.kernel.org/stable/c/7e9422d35d574b646269ca46010a835ca074b310 No Types Assigned	https://git.kernel.org/stable/c/7e9422d35d574b646269ca46010a835ca074b310 Patch
Changed	Reference Type	https://git.kernel.org/stable/c/ab1be3f1aa7799f99155488c28eacaef65eb68fb No Types Assigned	https://git.kernel.org/stable/c/ab1be3f1aa7799f99155488c28eacaef65eb68fb Patch
Changed	Reference Type	https://git.kernel.org/stable/c/c7bb26b847e5b97814f522686068c5628e2b3646 No Types Assigned	https://git.kernel.org/stable/c/c7bb26b847e5b97814f522686068c5628e2b3646 Patch
Changed	Reference Type	https://git.kernel.org/stable/c/f6d4d29a12655b42a13cec038c2902bb7efc50ed No Types Assigned	https://git.kernel.org/stable/c/f6d4d29a12655b42a13cec038c2902bb7efc50ed Patch

New CVE Received by NIST 4/17/2024 7:15:11 AM

Action	Type	Old Value	New Value
Added	Description		Record truncated, showing 500 of 2364 characters. View Entire Change Record In the Linux kernel, the following vulnerability has been resolved: btrfs: fix data race at btrfs_use_block_rsv() when accessing block reserve At btrfs_use_block_rsv() we read the size of a block reserve without locking its spinlock, which makes KCSAN complain because the size of a block reserve is always updated while holding its spinlock. The report from KCSAN is the following: [653.313148] BUG: KCSAN: data-race in btrfs_update_delayed_refs_rsv [btrfs] / btrfs_use_block_rsv [btrfs] [65
Added	Reference		kernel.org https://git.kernel.org/stable/c/2daa2a8e895e6dc2395f8628c011bcf1e019040d [No types assigned]
Added	Reference		kernel.org https://git.kernel.org/stable/c/7e9422d35d574b646269ca46010a835ca074b310 [No types assigned]
Added	Reference		kernel.org https://git.kernel.org/stable/c/ab1be3f1aa7799f99155488c28eacaef65eb68fb [No types assigned]
Added	Reference		kernel.org https://git.kernel.org/stable/c/c7bb26b847e5b97814f522686068c5628e2b3646 [No types assigned]
Added	Reference		kernel.org https://git.kernel.org/stable/c/f6d4d29a12655b42a13cec038c2902bb7efc50ed [No types assigned]