| Name | CVE-2022-48976 |
| Description | In the Linux kernel, the following vulnerability has been resolved:
netfilter: flowtable_offload: fix using __this_cpu_add in preemptible
flow_offload_queue_work() can be called in workqueue without
bh disabled, like the call trace showed in my act_ct testing,
calling NF_FLOW_TABLE_STAT_INC() there would cause a call
trace:
BUG: using __this_cpu_add() in preemptible [00000000] code: kworker/u4:0/138560
caller is flow_offload_queue_work+0xec/0x1b0 [nf_flow_table]
Workqueue: act_ct_workqueue tcf_ct_flow_table_cleanup_work [act_ct]
Call Trace:
<TASK>
dump_stack_lvl+0x33/0x46
check_preemption_disabled+0xc3/0xf0
flow_offload_queue_work+0xec/0x1b0 [nf_flow_table]
nf_flow_table_iterate+0x138/0x170 [nf_flow_table]
nf_flow_table_free+0x140/0x1a0 [nf_flow_table]
tcf_ct_flow_table_cleanup_work+0x2f/0x2b0 [act_ct]
process_one_work+0x6a3/0x1030
worker_thread+0x8a/0xdf0
This patch fixes it by using NF_FLOW_TABLE_STAT_INC_ATOMIC()
instead in flow_offload_queue_work().
Note that for FLOW_CLS_REPLACE branch in flow_offload_queue_work(),
it may not be called in preemptible path, but it's good to use
NF_FLOW_TABLE_STAT_INC_ATOMIC() for all cases in
flow_offload_queue_work(). |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
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The information below is based on the following data on fixed versions.