linux-kernel - [PATCH] bpf: return EOPNOTSUPP when JIT is needed and not possible

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Message-Id: <20211209134038.41388-1-cascardo@canonical.com>
Date:   Thu,  9 Dec 2021 10:40:38 -0300
From:   Thadeu Lima de Souza Cascardo <cascardo@...onical.com>
To:     bpf@...r.kernel.org
Cc:     netdev@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        linux-kernel@...r.kernel.org
Subject: [PATCH] bpf: return EOPNOTSUPP when JIT is needed and not possible

When a CBPF program is JITed and CONFIG_BPF_JIT_ALWAYS_ON is enabled, and
the JIT fails, it would return ENOTSUPP, which is not a valid userspace
error code.  Instead, EOPNOTSUPP should be returned.

Fixes: 290af86629b2 ("bpf: introduce BPF_JIT_ALWAYS_ON config")
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...onical.com>
---
 kernel/bpf/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index de3e5bc6781f..5c89bae0d6f9 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -1931,7 +1931,7 @@ struct bpf_prog *bpf_prog_select_runtime(struct bpf_prog *fp, int *err)
 		fp = bpf_int_jit_compile(fp);
 		bpf_prog_jit_attempt_done(fp);
 		if (!fp->jited && jit_needed) {
-			*err = -ENOTSUPP;
+			*err = -EOPNOTSUPP;
 			return fp;
 		}
 	} else {
-- 
2.32.0