CVE-2024-58070

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

bpf: bpf_local_storage: Always use bpf_mem_alloc in PREEMPT_RT

In PREEMPT_RT, kmalloc(GFP_ATOMIC) is still not safe in non preemptible

context. bpf_mem_alloc must be used in PREEMPT_RT. This patch is

to enforce bpf_mem_alloc in the bpf_local_storage when CONFIG_PREEMPT_RT

is enabled.

[ 35.118559] BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48

[ 35.118566] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1832, name: test_progs

[ 35.118569] preempt_count: 1, expected: 0

[ 35.118571] RCU nest depth: 1, expected: 1

[ 35.118577] INFO: lockdep is turned off.

...

[ 35.118647] __might_resched+0x433/0x5b0

[ 35.118677] rt_spin_lock+0xc3/0x290

[ 35.118700] ___slab_alloc+0x72/0xc40

[ 35.118723] __kmalloc_noprof+0x13f/0x4e0

[ 35.118732] bpf_map_kzalloc+0xe5/0x220

[ 35.118740] bpf_selem_alloc+0x1d2/0x7b0

[ 35.118755] bpf_local_storage_update+0x2fa/0x8

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References