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UPSTREAM: bpf: Add schedule points in batch ops

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commit 75134f16e7dd0007aa474b281935c5f42e79f2c8 upstream.

syzbot reported various soft lockups caused by bpf batch operations.

 INFO: task kworker/1:1:27 blocked for more than 140 seconds.
 INFO: task hung in rcu_barrier

Nothing prevents batch ops to process huge amount of data,
we need to add schedule points in them.

Note that maybe_wait_bpf_programs(map) calls from
generic_map_delete_batch() can be factorized by moving
the call after the loop.

This will be done later in -next tree once we get this fix merged,
unless there is strong opinion doing this optimization sooner.

Fixes: aa2e93b8e58e ("bpf: Add generic support for update and delete batch ops")
Fixes: cb4d03ab499d ("bpf: Add generic support for lookup batch op")
Reported-by: syzbot <syzkaller@googlegroups.com>
Change-Id: I11ed1b3c8662ad2e2212ff61a09525c6c5fae83b
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Acked-by: Brian Vazquez <brianvv@google.com>
Link: https://lore.kernel.org/bpf/20220217181902.808742-1-eric.dumazet@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eric Dumazet 2022-02-17 10:19:02 -08:00 • committed by basamaryan
commit e0312eb2a2
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1 changed files with 3 additions and 0 deletions
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3
kernel/bpf/syscall.c
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@ -1304,6 +1304,7 @@ int generic_map_delete_batch(struct bpf_map *map,
maybe_wait_bpf_programs(map);
if (err)
break;
cond_resched();
}
if (copy_to_user(&uattr->batch.count, &cp, sizeof(cp)))
err = -EFAULT;
@ -1361,6 +1362,7 @@ int generic_map_update_batch(struct bpf_map *map,
if (err)
break;
cond_resched();
}
if (copy_to_user(&uattr->batch.count, &cp, sizeof(cp)))
@ -1458,6 +1460,7 @@ int generic_map_lookup_batch(struct bpf_map *map,
swap(prev_key, key);
retry = MAP_LOOKUP_RETRIES;
cp++;
cond_resched();
}
if (err == -EFAULT)