Configuring an instance's parallel mask without any online CPUs... echo 2 > /sys/kernel/pcrypt/pencrypt/parallel_cpumask echo 0 > /sys/devices/system/cpu/cpu1/online ...makes tcrypt mode=215 crash like this: divide error: 0000 [#1] SMP PTI CPU: 4 PID: 283 Comm: modprobe Not tainted 5.4.0-rc8-padata-doc-v2+ #2 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20191013_105130-anatol 04/01/2014 RIP: 0010:padata_do_parallel+0x114/0x300 Call Trace: pcrypt_aead_encrypt+0xc0/0xd0 [pcrypt] crypto_aead_encrypt+0x1f/0x30 do_mult_aead_op+0x4e/0xdf [tcrypt] test_mb_aead_speed.constprop.0.cold+0x226/0x564 [tcrypt] do_test+0x28c2/0x4d49 [tcrypt] tcrypt_mod_init+0x55/0x1000 [tcrypt] ... cpumask_weight() in padata_cpu_hash() returns 0 because the mask has no CPUs. The problem is __padata_remove_cpu() checks for valid masks too early and so doesn't mark the instance PADATA_INVALID as expected, which would have made padata_do_parallel() return error before doing the division. Fix by introducing a second padata CPU hotplug state before CPUHP_BRINGUP_CPU so that __padata_remove_cpu() sees the online mask without @cpu. No need for the second argument to padata_replace() since @cpu is now already missing from the online mask. Fixes: 33e54450683c ("padata: Handle empty padata cpumasks") Signed-off-by: Daniel Jordan <daniel.m.jordan@xxxxxxxxxx> Cc: Eric Biggers <ebiggers@xxxxxxxxxx> Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Cc: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> Cc: Steffen Klassert <steffen.klassert@xxxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: linux-crypto@xxxxxxxxxxxxxxx Cc: linux-kernel@xxxxxxxxxxxxxxx --- include/linux/cpuhotplug.h | 1 + kernel/padata.c | 30 ++++++++++++++++++------------ 2 files changed, 19 insertions(+), 12 deletions(-) diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h index 068793a619ca..2d55cee638fc 100644 --- a/include/linux/cpuhotplug.h +++ b/include/linux/cpuhotplug.h @@ -59,6 +59,7 @@ enum cpuhp_state { CPUHP_IOMMU_INTEL_DEAD, CPUHP_LUSTRE_CFS_DEAD, CPUHP_AP_ARM_CACHE_B15_RAC_DEAD, + CPUHP_PADATA_DEAD, CPUHP_WORKQUEUE_PREP, CPUHP_POWER_NUMA_PREPARE, CPUHP_HRTIMERS_PREPARE, diff --git a/kernel/padata.c b/kernel/padata.c index 9e3c4df75907..a2fa6223e1a0 100644 --- a/kernel/padata.c +++ b/kernel/padata.c @@ -512,7 +512,7 @@ static int padata_replace_one(struct padata_shell *ps) return 0; } -static int padata_replace(struct padata_instance *pinst, int cpu) +static int padata_replace(struct padata_instance *pinst) { int notification_mask = 0; struct padata_shell *ps; @@ -523,16 +523,12 @@ static int padata_replace(struct padata_instance *pinst, int cpu) cpumask_copy(pinst->omask, pinst->rcpumask.pcpu); cpumask_and(pinst->rcpumask.pcpu, pinst->cpumask.pcpu, cpu_online_mask); - if (cpu >= 0) - cpumask_clear_cpu(cpu, pinst->rcpumask.pcpu); if (!cpumask_equal(pinst->omask, pinst->rcpumask.pcpu)) notification_mask |= PADATA_CPU_PARALLEL; cpumask_copy(pinst->omask, pinst->rcpumask.cbcpu); cpumask_and(pinst->rcpumask.cbcpu, pinst->cpumask.cbcpu, cpu_online_mask); - if (cpu >= 0) - cpumask_clear_cpu(cpu, pinst->rcpumask.cbcpu); if (!cpumask_equal(pinst->omask, pinst->rcpumask.cbcpu)) notification_mask |= PADATA_CPU_SERIAL; @@ -624,7 +620,7 @@ static int __padata_set_cpumasks(struct padata_instance *pinst, cpumask_copy(pinst->cpumask.pcpu, pcpumask); cpumask_copy(pinst->cpumask.cbcpu, cbcpumask); - err = padata_setup_cpumasks(pinst) ?: padata_replace(pinst, -1); + err = padata_setup_cpumasks(pinst) ?: padata_replace(pinst); if (valid) __padata_start(pinst); @@ -715,7 +711,7 @@ static int __padata_add_cpu(struct padata_instance *pinst, int cpu) int err = 0; if (cpumask_test_cpu(cpu, cpu_online_mask)) { - err = padata_replace(pinst, -1); + err = padata_replace(pinst); if (padata_validate_cpumask(pinst, pinst->cpumask.pcpu) && padata_validate_cpumask(pinst, pinst->cpumask.cbcpu)) @@ -729,12 +725,12 @@ static int __padata_remove_cpu(struct padata_instance *pinst, int cpu) { int err = 0; - if (cpumask_test_cpu(cpu, cpu_online_mask)) { + if (!cpumask_test_cpu(cpu, cpu_online_mask)) { if (!padata_validate_cpumask(pinst, pinst->cpumask.pcpu) || !padata_validate_cpumask(pinst, pinst->cpumask.cbcpu)) __padata_stop(pinst); - err = padata_replace(pinst, cpu); + err = padata_replace(pinst); } return err; @@ -761,7 +757,7 @@ static int padata_cpu_online(unsigned int cpu, struct hlist_node *node) return ret; } -static int padata_cpu_prep_down(unsigned int cpu, struct hlist_node *node) +static int padata_cpu_dead(unsigned int cpu, struct hlist_node *node) { struct padata_instance *pinst; int ret; @@ -782,6 +778,7 @@ static enum cpuhp_state hp_online; static void __padata_free(struct padata_instance *pinst) { #ifdef CONFIG_HOTPLUG_CPU + cpuhp_state_remove_instance_nocalls(CPUHP_PADATA_DEAD, &pinst->node); cpuhp_state_remove_instance_nocalls(hp_online, &pinst->node); #endif @@ -989,6 +986,8 @@ static struct padata_instance *padata_alloc(const char *name, #ifdef CONFIG_HOTPLUG_CPU cpuhp_state_add_instance_nocalls_cpuslocked(hp_online, &pinst->node); + cpuhp_state_add_instance_nocalls_cpuslocked(CPUHP_PADATA_DEAD, + &pinst->node); #endif put_online_cpus(); @@ -1101,17 +1100,24 @@ static __init int padata_driver_init(void) int ret; ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "padata:online", - padata_cpu_online, - padata_cpu_prep_down); + padata_cpu_online, NULL); if (ret < 0) return ret; hp_online = ret; + + ret = cpuhp_setup_state_multi(CPUHP_PADATA_DEAD, "padata:dead", + NULL, padata_cpu_dead); + if (ret < 0) { + cpuhp_remove_multi_state(hp_online); + return ret; + } return 0; } module_init(padata_driver_init); static __exit void padata_driver_exit(void) { + cpuhp_remove_multi_state(CPUHP_PADATA_DEAD); cpuhp_remove_multi_state(hp_online); } module_exit(padata_driver_exit); -- 2.24.0