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113 lines
6.7 KiB
JSON
113 lines
6.7 KiB
JSON
{
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"data_version": "4.0",
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"data_type": "CVE",
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"data_format": "MITRE",
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"CVE_data_meta": {
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"ID": "CVE-2024-50140",
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"ASSIGNER": "cve@kernel.org",
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"STATE": "PUBLIC"
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},
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"description": {
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"description_data": [
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{
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"lang": "eng",
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"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."
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}
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]
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},
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"problemtype": {
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"problemtype_data": [
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{
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"description": [
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{
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"lang": "eng",
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"value": "n/a"
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}
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]
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}
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]
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},
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"affects": {
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"vendor": {
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"vendor_data": [
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{
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"vendor_name": "Linux",
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"product": {
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"product_data": [
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{
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"product_name": "Linux",
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"version": {
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"version_data": [
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{
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"version_affected": "<",
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"version_name": "223baf9d17f2",
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"version_value": "509c29d0d26f"
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},
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{
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"version_value": "not down converted",
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"x_cve_json_5_version_data": {
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"versions": [
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{
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"version": "6.4",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.4",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.59",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.11.6",
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"lessThanOrEqual": "6.11.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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],
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"defaultStatus": "affected"
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}
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}
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]
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}
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}
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]
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}
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}
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]
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}
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},
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"references": {
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"reference_data": [
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{
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"url": "https://git.kernel.org/stable/c/509c29d0d26f68a6f6d0a05cb1a89725237e2b87",
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"refsource": "MISC",
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"name": "https://git.kernel.org/stable/c/509c29d0d26f68a6f6d0a05cb1a89725237e2b87"
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},
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{
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"url": "https://git.kernel.org/stable/c/ce0241ef83eed55f675376e8a3605d23de53d875",
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"refsource": "MISC",
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"name": "https://git.kernel.org/stable/c/ce0241ef83eed55f675376e8a3605d23de53d875"
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},
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{
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"url": "https://git.kernel.org/stable/c/73ab05aa46b02d96509cb029a8d04fca7bbde8c7",
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"refsource": "MISC",
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"name": "https://git.kernel.org/stable/c/73ab05aa46b02d96509cb029a8d04fca7bbde8c7"
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}
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]
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},
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"generator": {
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"engine": "bippy-8e903de6a542"
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}
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} |