gsd-2024-26904
Vulnerability from gsd
Modified
2024-02-20 06:02
Details
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.
Aliases
{ "gsd": { "metadata": { "exploitCode": "unknown", "remediation": "unknown", "reportConfidence": "confirmed", "type": "vulnerability" }, "osvSchema": { "aliases": [ "CVE-2024-26904" ], "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix data race at btrfs_use_block_rsv() when accessing block reserve\n\nAt btrfs_use_block_rsv() we read the size of a block reserve without\nlocking its spinlock, which makes KCSAN complain because the size of a\nblock reserve is always updated while holding its spinlock. The report\nfrom KCSAN is the following:\n\n [653.313148] BUG: KCSAN: data-race in btrfs_update_delayed_refs_rsv [btrfs] / btrfs_use_block_rsv [btrfs]\n\n [653.314755] read to 0x000000017f5871b8 of 8 bytes by task 7519 on cpu 0:\n [653.314779] btrfs_use_block_rsv+0xe4/0x2f8 [btrfs]\n [653.315606] btrfs_alloc_tree_block+0xdc/0x998 [btrfs]\n [653.316421] btrfs_force_cow_block+0x220/0xe38 [btrfs]\n [653.317242] btrfs_cow_block+0x1ac/0x568 [btrfs]\n [653.318060] btrfs_search_slot+0xda2/0x19b8 [btrfs]\n [653.318879] btrfs_del_csums+0x1dc/0x798 [btrfs]\n [653.319702] __btrfs_free_extent.isra.0+0xc24/0x2028 [btrfs]\n [653.320538] __btrfs_run_delayed_refs+0xd3c/0x2390 [btrfs]\n [653.321340] btrfs_run_delayed_refs+0xae/0x290 [btrfs]\n [653.322140] flush_space+0x5e4/0x718 [btrfs]\n [653.322958] btrfs_preempt_reclaim_metadata_space+0x102/0x2f8 [btrfs]\n [653.323781] process_one_work+0x3b6/0x838\n [653.323800] worker_thread+0x75e/0xb10\n [653.323817] kthread+0x21a/0x230\n [653.323836] __ret_from_fork+0x6c/0xb8\n [653.323855] ret_from_fork+0xa/0x30\n\n [653.323887] write to 0x000000017f5871b8 of 8 bytes by task 576 on cpu 3:\n [653.323906] btrfs_update_delayed_refs_rsv+0x1a4/0x250 [btrfs]\n [653.324699] btrfs_add_delayed_data_ref+0x468/0x6d8 [btrfs]\n [653.325494] btrfs_free_extent+0x76/0x120 [btrfs]\n [653.326280] __btrfs_mod_ref+0x6a8/0x6b8 [btrfs]\n [653.327064] btrfs_dec_ref+0x50/0x70 [btrfs]\n [653.327849] walk_up_proc+0x236/0xa50 [btrfs]\n [653.328633] walk_up_tree+0x21c/0x448 [btrfs]\n [653.329418] btrfs_drop_snapshot+0x802/0x1328 [btrfs]\n [653.330205] btrfs_clean_one_deleted_snapshot+0x184/0x238 [btrfs]\n [653.330995] cleaner_kthread+0x2b0/0x2f0 [btrfs]\n [653.331781] kthread+0x21a/0x230\n [653.331800] __ret_from_fork+0x6c/0xb8\n [653.331818] ret_from_fork+0xa/0x30\n\nSo add a helper to get the size of a block reserve while holding the lock.\nReading the field while holding the lock instead of using the data_race()\nannotation is used in order to prevent load tearing.", "id": "GSD-2024-26904", "modified": "2024-02-20T06:02:29.176425Z", "schema_version": "1.4.0" } }, "namespaces": { "cve.org": { "CVE_data_meta": { "ASSIGNER": "cve@kernel.org", "ID": "CVE-2024-26904", "STATE": "PUBLIC" }, "affects": { "vendor": { "vendor_data": [ { "product": { "product_data": [ { "product_name": "Linux", "version": { "version_data": [ { "version_affected": "\u003c", "version_name": "1da177e4c3f4", "version_value": "2daa2a8e895e" }, { "version_value": "not down converted", "x_cve_json_5_version_data": { "defaultStatus": "affected", "versions": [ { "lessThanOrEqual": "5.4.*", "status": "unaffected", "version": "5.4.273", "versionType": "custom" }, { "lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.83", "versionType": "custom" }, { "lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.23", "versionType": "custom" }, { "lessThanOrEqual": "6.7.*", "status": "unaffected", "version": "6.7.11", "versionType": "custom" }, { "lessThanOrEqual": "*", "status": "unaffected", "version": "6.8", "versionType": "original_commit_for_fix" } ] } } ] } } ] }, "vendor_name": "Linux" } ] } }, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": { "description_data": [ { "lang": "eng", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix data race at btrfs_use_block_rsv() when accessing block reserve\n\nAt btrfs_use_block_rsv() we read the size of a block reserve without\nlocking its spinlock, which makes KCSAN complain because the size of a\nblock reserve is always updated while holding its spinlock. The report\nfrom KCSAN is the following:\n\n [653.313148] BUG: KCSAN: data-race in btrfs_update_delayed_refs_rsv [btrfs] / btrfs_use_block_rsv [btrfs]\n\n [653.314755] read to 0x000000017f5871b8 of 8 bytes by task 7519 on cpu 0:\n [653.314779] btrfs_use_block_rsv+0xe4/0x2f8 [btrfs]\n [653.315606] btrfs_alloc_tree_block+0xdc/0x998 [btrfs]\n [653.316421] btrfs_force_cow_block+0x220/0xe38 [btrfs]\n [653.317242] btrfs_cow_block+0x1ac/0x568 [btrfs]\n [653.318060] btrfs_search_slot+0xda2/0x19b8 [btrfs]\n [653.318879] btrfs_del_csums+0x1dc/0x798 [btrfs]\n [653.319702] __btrfs_free_extent.isra.0+0xc24/0x2028 [btrfs]\n [653.320538] __btrfs_run_delayed_refs+0xd3c/0x2390 [btrfs]\n [653.321340] btrfs_run_delayed_refs+0xae/0x290 [btrfs]\n [653.322140] flush_space+0x5e4/0x718 [btrfs]\n [653.322958] btrfs_preempt_reclaim_metadata_space+0x102/0x2f8 [btrfs]\n [653.323781] process_one_work+0x3b6/0x838\n [653.323800] worker_thread+0x75e/0xb10\n [653.323817] kthread+0x21a/0x230\n [653.323836] __ret_from_fork+0x6c/0xb8\n [653.323855] ret_from_fork+0xa/0x30\n\n [653.323887] write to 0x000000017f5871b8 of 8 bytes by task 576 on cpu 3:\n [653.323906] btrfs_update_delayed_refs_rsv+0x1a4/0x250 [btrfs]\n [653.324699] btrfs_add_delayed_data_ref+0x468/0x6d8 [btrfs]\n [653.325494] btrfs_free_extent+0x76/0x120 [btrfs]\n [653.326280] __btrfs_mod_ref+0x6a8/0x6b8 [btrfs]\n [653.327064] btrfs_dec_ref+0x50/0x70 [btrfs]\n [653.327849] walk_up_proc+0x236/0xa50 [btrfs]\n [653.328633] walk_up_tree+0x21c/0x448 [btrfs]\n [653.329418] btrfs_drop_snapshot+0x802/0x1328 [btrfs]\n [653.330205] btrfs_clean_one_deleted_snapshot+0x184/0x238 [btrfs]\n [653.330995] cleaner_kthread+0x2b0/0x2f0 [btrfs]\n [653.331781] kthread+0x21a/0x230\n [653.331800] __ret_from_fork+0x6c/0xb8\n [653.331818] ret_from_fork+0xa/0x30\n\nSo add a helper to get the size of a block reserve while holding the lock.\nReading the field while holding the lock instead of using the data_race()\nannotation is used in order to prevent load tearing." } ] }, "generator": { "engine": "bippy-d175d3acf727" }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "n/a" } ] } ] }, "references": { "reference_data": [ { "name": "https://git.kernel.org/stable/c/2daa2a8e895e6dc2395f8628c011bcf1e019040d", "refsource": "MISC", "url": "https://git.kernel.org/stable/c/2daa2a8e895e6dc2395f8628c011bcf1e019040d" }, { "name": "https://git.kernel.org/stable/c/ab1be3f1aa7799f99155488c28eacaef65eb68fb", "refsource": "MISC", "url": "https://git.kernel.org/stable/c/ab1be3f1aa7799f99155488c28eacaef65eb68fb" }, { "name": "https://git.kernel.org/stable/c/f6d4d29a12655b42a13cec038c2902bb7efc50ed", "refsource": "MISC", "url": "https://git.kernel.org/stable/c/f6d4d29a12655b42a13cec038c2902bb7efc50ed" }, { "name": "https://git.kernel.org/stable/c/7e9422d35d574b646269ca46010a835ca074b310", "refsource": "MISC", "url": "https://git.kernel.org/stable/c/7e9422d35d574b646269ca46010a835ca074b310" }, { "name": "https://git.kernel.org/stable/c/c7bb26b847e5b97814f522686068c5628e2b3646", "refsource": "MISC", "url": "https://git.kernel.org/stable/c/c7bb26b847e5b97814f522686068c5628e2b3646" } ] } }, "nvd.nist.gov": { "cve": { "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix data race at btrfs_use_block_rsv() when accessing block reserve\n\nAt btrfs_use_block_rsv() we read the size of a block reserve without\nlocking its spinlock, which makes KCSAN complain because the size of a\nblock reserve is always updated while holding its spinlock. The report\nfrom KCSAN is the following:\n\n [653.313148] BUG: KCSAN: data-race in btrfs_update_delayed_refs_rsv [btrfs] / btrfs_use_block_rsv [btrfs]\n\n [653.314755] read to 0x000000017f5871b8 of 8 bytes by task 7519 on cpu 0:\n [653.314779] btrfs_use_block_rsv+0xe4/0x2f8 [btrfs]\n [653.315606] btrfs_alloc_tree_block+0xdc/0x998 [btrfs]\n [653.316421] btrfs_force_cow_block+0x220/0xe38 [btrfs]\n [653.317242] btrfs_cow_block+0x1ac/0x568 [btrfs]\n [653.318060] btrfs_search_slot+0xda2/0x19b8 [btrfs]\n [653.318879] btrfs_del_csums+0x1dc/0x798 [btrfs]\n [653.319702] __btrfs_free_extent.isra.0+0xc24/0x2028 [btrfs]\n [653.320538] __btrfs_run_delayed_refs+0xd3c/0x2390 [btrfs]\n [653.321340] btrfs_run_delayed_refs+0xae/0x290 [btrfs]\n [653.322140] flush_space+0x5e4/0x718 [btrfs]\n [653.322958] btrfs_preempt_reclaim_metadata_space+0x102/0x2f8 [btrfs]\n [653.323781] process_one_work+0x3b6/0x838\n [653.323800] worker_thread+0x75e/0xb10\n [653.323817] kthread+0x21a/0x230\n [653.323836] __ret_from_fork+0x6c/0xb8\n [653.323855] ret_from_fork+0xa/0x30\n\n [653.323887] write to 0x000000017f5871b8 of 8 bytes by task 576 on cpu 3:\n [653.323906] btrfs_update_delayed_refs_rsv+0x1a4/0x250 [btrfs]\n [653.324699] btrfs_add_delayed_data_ref+0x468/0x6d8 [btrfs]\n [653.325494] btrfs_free_extent+0x76/0x120 [btrfs]\n [653.326280] __btrfs_mod_ref+0x6a8/0x6b8 [btrfs]\n [653.327064] btrfs_dec_ref+0x50/0x70 [btrfs]\n [653.327849] walk_up_proc+0x236/0xa50 [btrfs]\n [653.328633] walk_up_tree+0x21c/0x448 [btrfs]\n [653.329418] btrfs_drop_snapshot+0x802/0x1328 [btrfs]\n [653.330205] btrfs_clean_one_deleted_snapshot+0x184/0x238 [btrfs]\n [653.330995] cleaner_kthread+0x2b0/0x2f0 [btrfs]\n [653.331781] kthread+0x21a/0x230\n [653.331800] __ret_from_fork+0x6c/0xb8\n [653.331818] ret_from_fork+0xa/0x30\n\nSo add a helper to get the size of a block reserve while holding the lock.\nReading the field while holding the lock instead of using the data_race()\nannotation is used in order to prevent load tearing." } ], "id": "CVE-2024-26904", "lastModified": "2024-04-17T12:48:07.510", "metrics": {}, "published": "2024-04-17T11:15:11.113", "references": [ { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2daa2a8e895e6dc2395f8628c011bcf1e019040d" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7e9422d35d574b646269ca46010a835ca074b310" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ab1be3f1aa7799f99155488c28eacaef65eb68fb" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c7bb26b847e5b97814f522686068c5628e2b3646" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f6d4d29a12655b42a13cec038c2902bb7efc50ed" } ], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis" } } } }
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