CVE-2024-57885: mm/kmemleak: fix sleeping function called from invalid context at print message
Description
In the Linux kernel, the following vulnerability has been resolved:
mm/kmemleak: fix sleeping function called from invalid context at print message
Address a bug in the kernel that triggers a "sleeping function called from
invalid context" warning when /sys/kernel/debug/kmemleak is printed under
specific conditions:
- CONFIG_PREEMPT_RT=y
- Set SELinux as the LSM for the system
- Set kptr_restrict to 1
- kmemleak buffer contains at least one item
BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48
in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 136, name: cat
preempt_count: 1, expected: 0
RCU nest depth: 2, expected: 2
6 locks held by cat/136:
#0: ffff32e64bcbf950 (&p->lock){+.+.}-{3:3}, at: seq_read_iter+0xb8/0xe30
#1: ffffafe6aaa9dea0 (scan_mutex){+.+.}-{3:3}, at: kmemleak_seq_start+0x34/0x128
#3: ffff32e6546b1cd0 (&object->lock){....}-{2:2}, at: kmemleak_seq_show+0x3c/0x1e0
#4: ffffafe6aa8d8560 (rcu_read_lock){....}-{1:2}, at: has_ns_capability_noaudit+0x8/0x1b0
#5: ffffafe6aabbc0f8 (notif_lock){+.+.}-{2:2}, at: avc_compute_av+0xc4/0x3d0
irq event stamp: 136660
hardirqs last enabled at (136659): [] _raw_spin_unlock_irqrestore+0xa8/0xd8
hardirqs last disabled at (136660): [] _raw_spin_lock_irqsave+0x8c/0xb0
softirqs last enabled at (0): [] copy_process+0x11d8/0x3df8
softirqs last disabled at (0): [<0000000000000000>] 0x0
Preemption disabled at:
[] kmemleak_seq_show+0x3c/0x1e0
CPU: 1 UID: 0 PID: 136 Comm: cat Tainted: G ...
Classification
CVE ID: CVE-2024-57885
Affected Products
Vendor: Linux
Product: Linux
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.05% (probability of being exploited)
EPSS Percentile: 17.81% (scored less or equal to compared to others)
EPSS Date: 2025-02-13 (when was this score calculated)
References
https://git.kernel.org/stable/c/86d946f3f9992aaa12abcfd09f925446c2cd42a2https://git.kernel.org/stable/c/64b2d32f22597b2a1dc83ac600b2426588851a97
https://git.kernel.org/stable/c/cddc76b165161a02ff14c4d84d0f5266d9d32b9e