[PATCH bpf-next v2 1/2] bpf: Allow usage of BPF ringbuffer in sleepable programs

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The BPF ringbuffer map is pre-allocated and the implementation logic
does not rely on disabling preemption or per-cpu data structures. Using
the BPF ringbuffer sleepable LSM and tracing programs does not trigger
any warnings with DEBUG_ATOMIC_SLEEP, DEBUG_PREEMPT,
PROVE_RCU and PROVE_LOCKING and LOCKDEP enabled.

This allows helpers like bpf_copy_from_user and bpf_ima_inode_hash to
write to the BPF ring buffer from sleepable BPF programs.

Acked-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
Signed-off-by: KP Singh <kpsingh@xxxxxxxxxx>
---
 kernel/bpf/verifier.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 5e09632efddb..4c33b4840438 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -10024,6 +10024,8 @@ static int check_map_prog_compatibility(struct bpf_verifier_env *env,
 				return -EINVAL;
 			}
 			break;
+		case BPF_MAP_TYPE_RINGBUF:
+			break;
 		default:
 			verbose(env,
 				"Sleepable programs can only use array and hash maps\n");
-- 
2.30.0.365.g02bc693789-goog




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