bpf: Disable migration when freeing stashed local kptr using obj drop
When a local kptr is stashed in a map and freed when the map goes away,
currently an error like the below appears:
[ 39.195695] BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u32:15/2875
[ 39.196549] caller is bpf_mem_free+0x56/0xc0
[ 39.196958] CPU: 15 PID: 2875 Comm: kworker/u32:15 Tainted: G O 6.2.0-13016-g22df776a9a86 #4477
[ 39.197897] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
[ 39.198949] Workqueue: events_unbound bpf_map_free_deferred
[ 39.199470] Call Trace:
[ 39.199703] <TASK>
[ 39.199911] dump_stack_lvl+0x60/0x70
[ 39.200267] check_preemption_disabled+0xbf/0xe0
[ 39.200704] bpf_mem_free+0x56/0xc0
[ 39.201032] ? bpf_obj_new_impl+0xa0/0xa0
[ 39.201430] bpf_obj_free_fields+0x1cd/0x200
[ 39.201838] array_map_free+0xad/0x220
[ 39.202193] ? finish_task_switch+0xe5/0x3c0
[ 39.202614] bpf_map_free_deferred+0xea/0x210
[ 39.203006] ? lockdep_hardirqs_on_prepare+0xe/0x220
[ 39.203460] process_one_work+0x64f/0xbe0
[ 39.203822] ? pwq_dec_nr_in_flight+0x110/0x110
[ 39.204264] ? do_raw_spin_lock+0x107/0x1c0
[ 39.204662] ? lockdep_hardirqs_on_prepare+0xe/0x220
[ 39.205107] worker_thread+0x74/0x7a0
[ 39.205451] ? process_one_work+0xbe0/0xbe0
[ 39.205818] kthread+0x171/0x1a0
[ 39.206111] ? kthread_complete_and_exit+0x20/0x20
[ 39.206552] ret_from_fork+0x1f/0x30
[ 39.206886] </TASK>
This happens because the call to __bpf_obj_drop_impl I added in the patch
adding support for stashing local kptrs doesn't disable migration. Prior
to that patch, __bpf_obj_drop_impl logic only ran when called by a BPF
progarm, whereas now it can be called from map free path, so it's
necessary to explicitly disable migration.
Also, refactor a bit to just call __bpf_obj_drop_impl directly instead
of bothering w/ dtor union and setting pointer-to-obj_drop.
Fixes: c8e1875409
("bpf: Support __kptr to local kptrs")
Reported-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Dave Marchevsky <davemarchevsky@fb.com>
Link: https://lore.kernel.org/r/20230313214641.3731908-1-davemarchevsky@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
parent
22df776a9a
commit
9e36a204bd
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@ -190,18 +190,14 @@ enum btf_field_type {
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};
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typedef void (*btf_dtor_kfunc_t)(void *);
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typedef void (*btf_dtor_obj_drop)(void *, const struct btf_record *);
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struct btf_field_kptr {
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struct btf *btf;
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struct module *module;
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union {
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/* dtor used if btf_is_kernel(btf), otherwise the type
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* is program-allocated and obj_drop is used
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*/
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btf_dtor_kfunc_t dtor;
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btf_dtor_obj_drop obj_drop;
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};
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/* dtor used if btf_is_kernel(btf), otherwise the type is
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* program-allocated, dtor is NULL, and __bpf_obj_drop_impl is used
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*/
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btf_dtor_kfunc_t dtor;
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u32 btf_id;
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};
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@ -3551,8 +3551,6 @@ static int btf_find_field(const struct btf *btf, const struct btf_type *t,
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return -EINVAL;
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}
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extern void __bpf_obj_drop_impl(void *p, const struct btf_record *rec);
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static int btf_parse_kptr(const struct btf *btf, struct btf_field *field,
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struct btf_field_info *info)
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{
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@ -3578,7 +3576,7 @@ static int btf_parse_kptr(const struct btf *btf, struct btf_field *field,
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/* Type exists only in program BTF. Assume that it's a MEM_ALLOC
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* kptr allocated via bpf_obj_new
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*/
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field->kptr.dtor = (void *)&__bpf_obj_drop_impl;
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field->kptr.dtor = NULL;
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id = info->kptr.type_id;
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kptr_btf = (struct btf *)btf;
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btf_get(kptr_btf);
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@ -650,6 +650,8 @@ void bpf_obj_free_timer(const struct btf_record *rec, void *obj)
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bpf_timer_cancel_and_free(obj + rec->timer_off);
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}
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extern void __bpf_obj_drop_impl(void *p, const struct btf_record *rec);
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void bpf_obj_free_fields(const struct btf_record *rec, void *obj)
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{
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const struct btf_field *fields;
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@ -679,9 +681,11 @@ void bpf_obj_free_fields(const struct btf_record *rec, void *obj)
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pointee_struct_meta = btf_find_struct_meta(field->kptr.btf,
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field->kptr.btf_id);
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WARN_ON_ONCE(!pointee_struct_meta);
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field->kptr.obj_drop(xchgd_field, pointee_struct_meta ?
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pointee_struct_meta->record :
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NULL);
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migrate_disable();
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__bpf_obj_drop_impl(xchgd_field, pointee_struct_meta ?
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pointee_struct_meta->record :
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NULL);
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migrate_enable();
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} else {
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field->kptr.dtor(xchgd_field);
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}
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