diff mbox series

[PATCHv9,bpf-next,01/13] bpf: Allow return values 0 and 1 for kprobe session

Message ID 20241108134544.480660-2-jolsa@kernel.org (mailing list archive)
State Accepted
Commit 1c9b65d7b5698f2e01f8f845ffbfd4fdb267cfb6
Delegated to: BPF
Headers show
Series bpf: Add uprobe session support | expand

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netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 5 this patch: 5
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers warning 5 maintainers not CCed: martin.lau@linux.dev kpsingh@kernel.org song@kernel.org eddyz87@gmail.com yonghong.song@linux.dev
netdev/build_clang success Errors and warnings before: 3 this patch: 3
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Commit Message

Jiri Olsa Nov. 8, 2024, 1:45 p.m. UTC 
The kprobe session program can return only 0 or 1,
instruct verifier to check for that.

Fixes: 535a3692ba72 ("bpf: Add support for kprobe session attach")
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 kernel/bpf/verifier.c | 9 +++++++++
 1 file changed, 9 insertions(+)
diff mbox series

Patch

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 7958d6ff6b73..7d8ed377b35d 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -16024,6 +16024,15 @@  static int check_return_code(struct bpf_verifier_env *env, int regno, const char
 			return -ENOTSUPP;
 		}
 		break;
+	case BPF_PROG_TYPE_KPROBE:
+		switch (env->prog->expected_attach_type) {
+		case BPF_TRACE_KPROBE_SESSION:
+			range = retval_range(0, 1);
+			break;
+		default:
+			return 0;
+		}
+		break;
 	case BPF_PROG_TYPE_SK_LOOKUP:
 		range = retval_range(SK_DROP, SK_PASS);
 		break;