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From: Alexei Starovoitov <ast@kernel.org>
Date: Wed, 1 Dec 2021 10:10:29 -0800
Subject: bpf: Adjust BTF log size limit.
Git-commit: c5a2d43e998a821701029f23e25b62f9188e93ff
Patch-mainline: v5.17-rc1
References: git-fixes
X-Info: dependent patch for 866de407444398bc8140ea70de1dba5f91cc34ac

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@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20211201181040.23337-7-alexei.starovoitov@gmail.com

Signed-off-by: Tony Jones <tonyj@suse.de>
---
 kernel/bpf/btf.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -3420,7 +3420,7 @@ static struct btf *btf_parse(void __user
 		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;