| { |
| "containers": { |
| "cna": { |
| "providerMetadata": { |
| "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" |
| }, |
| "descriptions": [ |
| { |
| "lang": "en", |
| "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Restructure trace_clock_global() to never block\n\nIt was reported that a fix to the ring buffer recursion detection would\ncause a hung machine when performing suspend / resume testing. The\nfollowing backtrace was extracted from debugging that case:\n\nCall Trace:\n trace_clock_global+0x91/0xa0\n __rb_reserve_next+0x237/0x460\n ring_buffer_lock_reserve+0x12a/0x3f0\n trace_buffer_lock_reserve+0x10/0x50\n __trace_graph_return+0x1f/0x80\n trace_graph_return+0xb7/0xf0\n ? trace_clock_global+0x91/0xa0\n ftrace_return_to_handler+0x8b/0xf0\n ? pv_hash+0xa0/0xa0\n return_to_handler+0x15/0x30\n ? ftrace_graph_caller+0xa0/0xa0\n ? trace_clock_global+0x91/0xa0\n ? __rb_reserve_next+0x237/0x460\n ? ring_buffer_lock_reserve+0x12a/0x3f0\n ? trace_event_buffer_lock_reserve+0x3c/0x120\n ? trace_event_buffer_reserve+0x6b/0xc0\n ? trace_event_raw_event_device_pm_callback_start+0x125/0x2d0\n ? dpm_run_callback+0x3b/0xc0\n ? pm_ops_is_empty+0x50/0x50\n ? platform_get_irq_byname_optional+0x90/0x90\n ? trace_device_pm_callback_start+0x82/0xd0\n ? dpm_run_callback+0x49/0xc0\n\nWith the following RIP:\n\nRIP: 0010:native_queued_spin_lock_slowpath+0x69/0x200\n\nSince the fix to the recursion detection would allow a single recursion to\nhappen while tracing, this lead to the trace_clock_global() taking a spin\nlock and then trying to take it again:\n\nring_buffer_lock_reserve() {\n trace_clock_global() {\n arch_spin_lock() {\n queued_spin_lock_slowpath() {\n /* lock taken */\n (something else gets traced by function graph tracer)\n ring_buffer_lock_reserve() {\n trace_clock_global() {\n arch_spin_lock() {\n queued_spin_lock_slowpath() {\n /* DEAD LOCK! */\n\nTracing should *never* block, as it can lead to strange lockups like the\nabove.\n\nRestructure the trace_clock_global() code to instead of simply taking a\nlock to update the recorded \"prev_time\" simply use it, as two events\nhappening on two different CPUs that calls this at the same time, really\ndoesn't matter which one goes first. Use a trylock to grab the lock for\nupdating the prev_time, and if it fails, simply try again the next time.\nIf it failed to be taken, that means something else is already updating\nit.\n\n\nBugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=212761" |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "kernel/trace/trace_clock.c" |
| ], |
| "versions": [ |
| { |
| "version": "14131f2f98ac350ee9e73faed916d2238a8b6a0d", |
| "lessThan": "91ca6f6a91f679c8645d7f3307e03ce86ad518c4", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "14131f2f98ac350ee9e73faed916d2238a8b6a0d", |
| "lessThan": "859b47a43f5a0e5b9a92b621dc6ceaad39fb5c8b", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "14131f2f98ac350ee9e73faed916d2238a8b6a0d", |
| "lessThan": "1fca00920327be96f3318224f502e4d5460f9545", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "14131f2f98ac350ee9e73faed916d2238a8b6a0d", |
| "lessThan": "d43d56dbf452ccecc1ec735cd4b6840118005d7c", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "14131f2f98ac350ee9e73faed916d2238a8b6a0d", |
| "lessThan": "c64da3294a7d59a4bf6874c664c13be892f15f44", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "14131f2f98ac350ee9e73faed916d2238a8b6a0d", |
| "lessThan": "a33614d52e97fc8077eb0b292189ca7d964cc534", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "14131f2f98ac350ee9e73faed916d2238a8b6a0d", |
| "lessThan": "6e2418576228eeb12e7ba82edb8f9500623942ff", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "14131f2f98ac350ee9e73faed916d2238a8b6a0d", |
| "lessThan": "2a1bd74b8186d7938bf004f5603f25b84785f63e", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "14131f2f98ac350ee9e73faed916d2238a8b6a0d", |
| "lessThan": "aafe104aa9096827a429bc1358f8260ee565b7cc", |
| "status": "affected", |
| "versionType": "git" |
| } |
| ] |
| }, |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "affected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "kernel/trace/trace_clock.c" |
| ], |
| "versions": [ |
| { |
| "version": "2.6.30", |
| "status": "affected" |
| }, |
| { |
| "version": "0", |
| "lessThan": "2.6.30", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "4.4.269", |
| "lessThanOrEqual": "4.4.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "4.9.269", |
| "lessThanOrEqual": "4.9.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "4.14.233", |
| "lessThanOrEqual": "4.14.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "4.19.191", |
| "lessThanOrEqual": "4.19.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.4.118", |
| "lessThanOrEqual": "5.4.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.10.36", |
| "lessThanOrEqual": "5.10.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.11.20", |
| "lessThanOrEqual": "5.11.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.12.3", |
| "lessThanOrEqual": "5.12.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.13", |
| "lessThanOrEqual": "*", |
| "status": "unaffected", |
| "versionType": "original_commit_for_fix" |
| } |
| ] |
| } |
| ], |
| "cpeApplicability": [ |
| { |
| "nodes": [ |
| { |
| "operator": "OR", |
| "negate": false, |
| "cpeMatch": [ |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "2.6.30", |
| "versionEndExcluding": "4.4.269" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "2.6.30", |
| "versionEndExcluding": "4.9.269" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "2.6.30", |
| "versionEndExcluding": "4.14.233" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "2.6.30", |
| "versionEndExcluding": "4.19.191" |
| }, |
| { |
| "vulnerable": true, |
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| "versionStartIncluding": "2.6.30", |
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| }, |
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| "versionStartIncluding": "2.6.30", |
| "versionEndExcluding": "5.10.36" |
| }, |
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| "versionEndExcluding": "5.11.20" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "2.6.30", |
| "versionEndExcluding": "5.12.3" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "2.6.30", |
| "versionEndExcluding": "5.13" |
| } |
| ] |
| } |
| ] |
| } |
| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/91ca6f6a91f679c8645d7f3307e03ce86ad518c4" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/859b47a43f5a0e5b9a92b621dc6ceaad39fb5c8b" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/1fca00920327be96f3318224f502e4d5460f9545" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/d43d56dbf452ccecc1ec735cd4b6840118005d7c" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/c64da3294a7d59a4bf6874c664c13be892f15f44" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/a33614d52e97fc8077eb0b292189ca7d964cc534" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/6e2418576228eeb12e7ba82edb8f9500623942ff" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/2a1bd74b8186d7938bf004f5603f25b84785f63e" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/aafe104aa9096827a429bc1358f8260ee565b7cc" |
| } |
| ], |
| "title": "tracing: Restructure trace_clock_global() to never block", |
| "x_generator": { |
| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2021-46939", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
