{"id":"CVE-2023-53231","revision":"016805cabe284741ae60dd83d5fdabca","records":[{"revision":"016805cabe284741ae60dd83d5fdabca","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2023-53231","aliases":[],"title":"erofs: Fix detection of atomic context","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: Fix detection of atomic context\n\nCurrent check for atomic context is not sufficient as\nz_erofs_decompressqueue_endio can be called under rcu lock\nfrom blk_mq_flush_plug_list(). See the stacktrace [1]\n\nIn such case we should hand off the decompression work for async\nprocessing rather than trying to do sync decompression in current\ncontext. Patch fixes the detection by checking for\nrcu_read_lock_any_held() and while at it use more appropriate\n!in_task() check than in_atomic().\n\nBackground: Historically erofs would always schedule a kworker for\ndecompression which would incur the scheduling cost regardless of\nthe context. But z_erofs_decompressqueue_endio() may not always\nbe in atomic context and we could actually benefit from doing the\ndecompression in z_erofs_decompressqueue_endio() if we are in\nthread context, for example when running with dm-verity.\nThis optimization was later added in patch [2] which has shown\nimprovement in performance benchmarks.\n\n==============================================\n[1] Problem stacktrace\n[name:core&]BUG: sleeping function called from invalid context at kernel/locking/mutex.c:291\n[name:core&]in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 1615, name: CpuMonitorServi\n[name:core&]preempt_count: 0, expected: 0\n[name:core&]RCU nest depth: 1, expected: 0\nCPU: 7 PID: 1615 Comm: CpuMonitorServi Tainted: G S W OE 6.1.25-android14-5-maybe-dirty-mainline #1\nHardware name: MT6897 (DT)\nCall trace:\n dump_backtrace+0x108/0x15c\n show_stack+0x20/0x30\n dump_stack_lvl+0x6c/0x8c\n dump_stack+0x20/0x48\n __might_resched+0x1fc/0x308\n __might_sleep+0x50/0x88\n mutex_lock+0x2c/0x110\n z_erofs_decompress_queue+0x11c/0xc10\n z_erofs_decompress_kickoff+0x110/0x1a4\n z_erofs_decompressqueue_endio+0x154/0x180\n bio_endio+0x1b0/0x1d8\n __dm_io_complete+0x22c/0x280\n clone_endio+0xe4/0x280\n bio_endio+0x1b0/0x1d8\n blk_update_request+0x138/0x3a4\n blk_mq_plug_issue_direct+0xd4/0x19c\n blk_mq_flush_plug_list+0x2b0/0x354\n __blk_flush_plug+0x110/0x160\n blk_finish_plug+0x30/0x4c\n read_pages+0x2fc/0x370\n page_cache_ra_unbounded+0xa4/0x23c\n page_cache_ra_order+0x290/0x320\n do_sync_mmap_readahead+0x108/0x2c0\n filemap_fault+0x19c/0x52c\n __do_fault+0xc4/0x114\n handle_mm_fault+0x5b4/0x1168\n do_page_fault+0x338/0x4b4\n do_translation_fault+0x40/0x60\n do_mem_abort+0x60/0xc8\n el0_da+0x4c/0xe0\n el0t_64_sync_handler+0xd4/0xfc\n el0t_64_sync+0x1a0/0x1a4\n\n[2] Link: https://lore.kernel.org/all/20210317035448.13921-1-huangjianan@oppo.com/","state":0,"publishedAt":"2025-09-15T14:22:03.599+00:00","modifiedAt":"2026-10-03T10:54:50.262+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"fs/erofs/zdata.c\"\n ],\n \"versions\": [\n {\n \"version\": \"aea1286dcbbb87cf33595c2ac8b153c29a4611cb\",\n \"lessThan\": \"c3446e50fb4dc39e2dfb5951a57bc175d38f68be\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"aea1286dcbbb87cf33595c2ac8b153c29a4611cb\",\n \"lessThan\": \"96bcd9650e15901201d964eef5f79d18a81daac8\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"aea1286dcbbb87cf33595c2ac8b153c29a4611cb\",\n \"lessThan\": \"597fb60c75132719687e173b75cab8f6eb1ca657\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"aea1286dcbbb87cf33595c2ac8b153c29a4611cb\",\n \"lessThan\": \"12d0a24afd9ea58e581ea64d64e066f2027b28d9\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"fs/erofs/zdata.c\"\n ],\n \"versions\": [\n {\n \"version\": \"4.19\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"4.19\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.222\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.189\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.4.7\",\n \"lessThanOrEqual\": \"6.4.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.5\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/c3446e50fb4dc39e2dfb5951a57bc175d38f68be","https://git.kernel.org/stable/c/96bcd9650e15901201d964eef5f79d18a81daac8","https://git.kernel.org/stable/c/597fb60c75132719687e173b75cab8f6eb1ca657","https://git.kernel.org/stable/c/12d0a24afd9ea58e581ea64d64e066f2027b28d9"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-53231","license":"CVE Program Terms of Use","key":"cve-program:CVE-2023-53231","identifiers":["CVE-2023-53231"]},"retained":false,"historicalAffected":[]}],"coverage":[]}