[PATCH 5.10 136/563] bpf: Adjust BTF log size limit.

[Greg Kroah-Hartman]

From: Alexei Starovoitov <ast@xxxxxxxxxx>

[ Upstream commit c5a2d43e998a821701029f23e25b62f9188e93ff ]

Make BTF log size limit to be the same as the verifier log size limit.
Otherwise tools that progressively increase log size and use the same log
for BTF loading and program loading will be hitting hard to debug EINVAL.

Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx>
Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
Link: https://lore.kernel.org/bpf/20211201181040.23337-7-alexei.starovoitov@xxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 kernel/bpf/btf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index aaf2fbaa0cc76..72534a6f4b96e 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -4135,7 +4135,7 @@ static struct btf *btf_parse(void __user *btf_data, u32 btf_data_size,
 		log->len_total = log_size;
 
 		/* log attributes have to be sane */
-		if (log->len_total < 128 || log->len_total > UINT_MAX >> 8 ||
+		if (log->len_total < 128 || log->len_total > UINT_MAX >> 2 ||
 		    !log->level || !log->ubuf) {
 			err = -EINVAL;
 			goto errout;
-- 
2.34.1