| { |
| "containers": { |
| "cna": { |
| "providerMetadata": { |
| "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" |
| }, |
| "descriptions": [ |
| { |
| "lang": "en", |
| "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/core: Disable page allocation in task_tick_mm_cid()\n\nWith KASAN and PREEMPT_RT enabled, calling task_work_add() in\ntask_tick_mm_cid() may cause the following splat.\n\n[ 63.696416] BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48\n[ 63.696416] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 610, name: modprobe\n[ 63.696416] preempt_count: 10001, expected: 0\n[ 63.696416] RCU nest depth: 1, expected: 1\n\nThis problem is caused by the following call trace.\n\n sched_tick() [ acquire rq->__lock ]\n -> task_tick_mm_cid()\n -> task_work_add()\n -> __kasan_record_aux_stack()\n -> kasan_save_stack()\n -> stack_depot_save_flags()\n -> alloc_pages_mpol_noprof()\n -> __alloc_pages_noprof()\n\t -> get_page_from_freelist()\n\t -> rmqueue()\n\t -> rmqueue_pcplist()\n\t -> __rmqueue_pcplist()\n\t -> rmqueue_bulk()\n\t -> rt_spin_lock()\n\nThe rq lock is a raw_spinlock_t. We can't sleep while holding\nit. IOW, we can't call alloc_pages() in stack_depot_save_flags().\n\nThe task_tick_mm_cid() function with its task_work_add() call was\nintroduced by commit 223baf9d17f2 (\"sched: Fix performance regression\nintroduced by mm_cid\") in v6.4 kernel.\n\nFortunately, there is a kasan_record_aux_stack_noalloc() variant that\ncalls stack_depot_save_flags() while not allowing it to allocate\nnew pages. To allow task_tick_mm_cid() to use task_work without\npage allocation, a new TWAF_NO_ALLOC flag is added to enable calling\nkasan_record_aux_stack_noalloc() instead of kasan_record_aux_stack()\nif set. The task_tick_mm_cid() function is modified to add this new flag.\n\nThe possible downside is the missing stack trace in a KASAN report due\nto new page allocation required when task_work_add_noallloc() is called\nwhich should be rare." |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "include/linux/task_work.h", |
| "kernel/sched/core.c", |
| "kernel/task_work.c" |
| ], |
| "versions": [ |
| { |
| "version": "223baf9d17f25e2608dbdff7232c095c1e612268", |
| "lessThan": "509c29d0d26f68a6f6d0a05cb1a89725237e2b87", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "223baf9d17f25e2608dbdff7232c095c1e612268", |
| "lessThan": "ce0241ef83eed55f675376e8a3605d23de53d875", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "223baf9d17f25e2608dbdff7232c095c1e612268", |
| "lessThan": "73ab05aa46b02d96509cb029a8d04fca7bbde8c7", |
| "status": "affected", |
| "versionType": "git" |
| } |
| ] |
| }, |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "affected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "include/linux/task_work.h", |
| "kernel/sched/core.c", |
| "kernel/task_work.c" |
| ], |
| "versions": [ |
| { |
| "version": "6.4", |
| "status": "affected" |
| }, |
| { |
| "version": "0", |
| "lessThan": "6.4", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.6.59", |
| "lessThanOrEqual": "6.6.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.11.6", |
| "lessThanOrEqual": "6.11.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.12", |
| "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": "6.4", |
| "versionEndExcluding": "6.6.59" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "6.4", |
| "versionEndExcluding": "6.11.6" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "6.4", |
| "versionEndExcluding": "6.12" |
| } |
| ] |
| } |
| ] |
| } |
| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/509c29d0d26f68a6f6d0a05cb1a89725237e2b87" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/ce0241ef83eed55f675376e8a3605d23de53d875" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/73ab05aa46b02d96509cb029a8d04fca7bbde8c7" |
| } |
| ], |
| "title": "sched/core: Disable page allocation in task_tick_mm_cid()", |
| "x_generator": { |
| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2024-50140", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
