summaryrefslogtreecommitdiff
path: root/kernel/bpf
diff options
context:
space:
mode:
authorAlexei Starovoitov <ast@kernel.org>2019-10-28 20:24:26 -0700
committerDaniel Borkmann <daniel@iogearbox.net>2019-10-30 16:22:55 +0100
commit15ab09bdca616538597fe4d2eb4db3c2d28716ba (patch)
tree6bfe97e74e387d3b4941d653bac5aafc3c2cc83d /kernel/bpf
parenta566e35f1e8b4b3be1e96a804d1cca38b578167c (diff)
downloadlinux-15ab09bdca616538597fe4d2eb4db3c2d28716ba.tar.gz
bpf: Enforce 'return 0' in BTF-enabled raw_tp programs
The return value of raw_tp programs is ignored by __bpf_trace_run() that calls them. The verifier also allows any value to be returned. For BTF-enabled raw_tp lets enforce 'return 0', so that return value can be used for something in the future. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/20191029032426.1206762-1-ast@kernel.org
Diffstat (limited to 'kernel/bpf')
-rw-r--r--kernel/bpf/verifier.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index c59778c0fc4d..6b0de04f8b91 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -6279,6 +6279,11 @@ static int check_return_code(struct bpf_verifier_env *env)
case BPF_PROG_TYPE_CGROUP_SYSCTL:
case BPF_PROG_TYPE_CGROUP_SOCKOPT:
break;
+ case BPF_PROG_TYPE_RAW_TRACEPOINT:
+ if (!env->prog->aux->attach_btf_id)
+ return 0;
+ range = tnum_const(0);
+ break;
default:
return 0;
}