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padata: add separate cpuhp node for CPUHP_PADATA_DEAD
commit3c2214b602
upstream. Removing the pcrypt module triggers this: general protection fault, probably for non-canonical address 0xdead000000000122 CPU: 5 PID: 264 Comm: modprobe Not tainted 5.6.0+ #2 Hardware name: QEMU Standard PC RIP: 0010:__cpuhp_state_remove_instance+0xcc/0x120 Call Trace: padata_sysfs_release+0x74/0xce kobject_put+0x81/0xd0 padata_free+0x12/0x20 pcrypt_exit+0x43/0x8ee [pcrypt] padata instances wrongly use the same hlist node for the online and dead states, so __padata_free()'s second cpuhp remove call chokes on the node that the first poisoned. cpuhp multi-instance callbacks only walk forward in cpuhp_step->list and the same node is linked in both the online and dead lists, so the list corruption that results from padata_alloc() adding the node to a second list without removing it from the first doesn't cause problems as long as no instances are freed. Avoid the issue by giving each state its own node. Fixes:894c9ef978
("padata: validate cpumask without removed CPU during offline") Signed-off-by: Daniel Jordan <daniel.m.jordan@oracle.com> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Steffen Klassert <steffen.klassert@secunet.com> Cc: linux-crypto@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: stable@vger.kernel.org # v5.4+ Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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parent
2b1207801c
commit
93175d935d
2 changed files with 12 additions and 8 deletions
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@ -138,7 +138,8 @@ struct parallel_data {
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/**
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* struct padata_instance - The overall control structure.
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*
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* @cpu_notifier: cpu hotplug notifier.
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* @cpu_online_node: Linkage for CPU online callback.
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* @cpu_dead_node: Linkage for CPU offline callback.
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* @wq: The workqueue in use.
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* @pd: The internal control structure.
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* @cpumask: User supplied cpumasks for parallel and serial works.
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@ -150,7 +151,8 @@ struct parallel_data {
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* @flags: padata flags.
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*/
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struct padata_instance {
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struct hlist_node node;
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struct hlist_node cpu_online_node;
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struct hlist_node cpu_dead_node;
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struct workqueue_struct *wq;
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struct parallel_data *pd;
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struct padata_cpumask cpumask;
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@ -748,7 +748,7 @@ static int padata_cpu_online(unsigned int cpu, struct hlist_node *node)
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struct padata_instance *pinst;
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int ret;
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pinst = hlist_entry_safe(node, struct padata_instance, node);
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pinst = hlist_entry_safe(node, struct padata_instance, cpu_online_node);
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if (!pinst_has_cpu(pinst, cpu))
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return 0;
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@ -763,7 +763,7 @@ static int padata_cpu_dead(unsigned int cpu, struct hlist_node *node)
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struct padata_instance *pinst;
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int ret;
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pinst = hlist_entry_safe(node, struct padata_instance, node);
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pinst = hlist_entry_safe(node, struct padata_instance, cpu_dead_node);
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if (!pinst_has_cpu(pinst, cpu))
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return 0;
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@ -779,8 +779,9 @@ static enum cpuhp_state hp_online;
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static void __padata_free(struct padata_instance *pinst)
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{
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#ifdef CONFIG_HOTPLUG_CPU
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cpuhp_state_remove_instance_nocalls(CPUHP_PADATA_DEAD, &pinst->node);
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cpuhp_state_remove_instance_nocalls(hp_online, &pinst->node);
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cpuhp_state_remove_instance_nocalls(CPUHP_PADATA_DEAD,
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&pinst->cpu_dead_node);
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cpuhp_state_remove_instance_nocalls(hp_online, &pinst->cpu_online_node);
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#endif
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padata_stop(pinst);
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@ -964,9 +965,10 @@ static struct padata_instance *padata_alloc(struct workqueue_struct *wq,
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mutex_init(&pinst->lock);
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#ifdef CONFIG_HOTPLUG_CPU
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cpuhp_state_add_instance_nocalls_cpuslocked(hp_online, &pinst->node);
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cpuhp_state_add_instance_nocalls_cpuslocked(hp_online,
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&pinst->cpu_online_node);
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cpuhp_state_add_instance_nocalls_cpuslocked(CPUHP_PADATA_DEAD,
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&pinst->node);
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&pinst->cpu_dead_node);
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#endif
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return pinst;
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