GHSA-355G-892P-7FP8
Vulnerability from github – Published: 2024-12-27 15:31 – Updated: 2025-11-03 21:31In the Linux kernel, the following vulnerability has been resolved:
kcsan: Turn report_filterlist_lock into a raw_spinlock
Ran Xiaokai reports that with a KCSAN-enabled PREEMPT_RT kernel, we can see splats like:
| BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48 | in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 0, name: swapper/1 | preempt_count: 10002, expected: 0 | RCU nest depth: 0, expected: 0 | no locks held by swapper/1/0. | irq event stamp: 156674 | hardirqs last enabled at (156673): [] do_idle+0x1f9/0x240 | hardirqs last disabled at (156674): [] sysvec_apic_timer_interrupt+0x14/0xc0 | softirqs last enabled at (0): [] copy_process+0xfc7/0x4b60 | softirqs last disabled at (0): [<0000000000000000>] 0x0 | Preemption disabled at: | [] paint_ptr+0x2a/0x90 | CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.11.0+ #3 | Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-0-ga698c8995f-prebuilt.qemu.org 04/01/2014 | Call Trace: | | dump_stack_lvl+0x7e/0xc0 | dump_stack+0x1d/0x30 | __might_resched+0x1a2/0x270 | rt_spin_lock+0x68/0x170 | kcsan_skip_report_debugfs+0x43/0xe0 | print_report+0xb5/0x590 | kcsan_report_known_origin+0x1b1/0x1d0 | kcsan_setup_watchpoint+0x348/0x650 | __tsan_unaligned_write1+0x16d/0x1d0 | hrtimer_interrupt+0x3d6/0x430 | __sysvec_apic_timer_interrupt+0xe8/0x3a0 | sysvec_apic_timer_interrupt+0x97/0xc0 |
On a detected data race, KCSAN's reporting logic checks if it should filter the report. That list is protected by the report_filterlist_lock non-raw spinlock which may sleep on RT kernels.
Since KCSAN may report data races in any context, convert it to a raw_spinlock.
This requires being careful about when to allocate memory for the filter list itself which can be done via KCSAN's debugfs interface. Concurrent modification of the filter list via debugfs should be rare: the chosen strategy is to optimistically pre-allocate memory before the critical section and discard if unused.
{
"affected": [],
"aliases": [
"CVE-2024-56610"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-12-27T15:15:20Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nkcsan: Turn report_filterlist_lock into a raw_spinlock\n\nRan Xiaokai reports that with a KCSAN-enabled PREEMPT_RT kernel, we can see\nsplats like:\n\n| BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48\n| in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 0, name: swapper/1\n| preempt_count: 10002, expected: 0\n| RCU nest depth: 0, expected: 0\n| no locks held by swapper/1/0.\n| irq event stamp: 156674\n| hardirqs last enabled at (156673): [\u003cffffffff81130bd9\u003e] do_idle+0x1f9/0x240\n| hardirqs last disabled at (156674): [\u003cffffffff82254f84\u003e] sysvec_apic_timer_interrupt+0x14/0xc0\n| softirqs last enabled at (0): [\u003cffffffff81099f47\u003e] copy_process+0xfc7/0x4b60\n| softirqs last disabled at (0): [\u003c0000000000000000\u003e] 0x0\n| Preemption disabled at:\n| [\u003cffffffff814a3e2a\u003e] paint_ptr+0x2a/0x90\n| CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.11.0+ #3\n| Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-0-ga698c8995f-prebuilt.qemu.org 04/01/2014\n| Call Trace:\n| \u003cIRQ\u003e\n| dump_stack_lvl+0x7e/0xc0\n| dump_stack+0x1d/0x30\n| __might_resched+0x1a2/0x270\n| rt_spin_lock+0x68/0x170\n| kcsan_skip_report_debugfs+0x43/0xe0\n| print_report+0xb5/0x590\n| kcsan_report_known_origin+0x1b1/0x1d0\n| kcsan_setup_watchpoint+0x348/0x650\n| __tsan_unaligned_write1+0x16d/0x1d0\n| hrtimer_interrupt+0x3d6/0x430\n| __sysvec_apic_timer_interrupt+0xe8/0x3a0\n| sysvec_apic_timer_interrupt+0x97/0xc0\n| \u003c/IRQ\u003e\n\nOn a detected data race, KCSAN\u0027s reporting logic checks if it should\nfilter the report. That list is protected by the report_filterlist_lock\n*non-raw* spinlock which may sleep on RT kernels.\n\nSince KCSAN may report data races in any context, convert it to a\nraw_spinlock.\n\nThis requires being careful about when to allocate memory for the filter\nlist itself which can be done via KCSAN\u0027s debugfs interface. Concurrent\nmodification of the filter list via debugfs should be rare: the chosen\nstrategy is to optimistically pre-allocate memory before the critical\nsection and discard if unused.",
"id": "GHSA-355g-892p-7fp8",
"modified": "2025-11-03T21:31:55Z",
"published": "2024-12-27T15:31:54Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-56610"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0ab4951c1473c7d1ceaf1232eb927109cd1c4859"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/59458fa4ddb47e7891c61b4a928d13d5f5b00aa0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/889a0d3a35fdedba1c5dcb6410c95c32421680ec"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/dca4e74a918586913d251c0b359e8cc96a3883ea"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ea6588abcc15d68fdeae777ffe3dd74c02eab407"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f4f2ef66d288ea796ddb8ecbdc2df074ab2d5f4d"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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