[PATCH bpf-next 2/6] bpf: remove minimum size restrictions on verifier log buffer

Andrii Nakryiko
2023-03-16T18:33:18Z

It's not clear why we have 128 as minimum size, but it makes testing
harder and seems unnecessary, as we carefully handle truncation
scenarios and use proper snprintf variants. So remove this limitation
and just enfore positive length for log buffer.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
---
kernel/bpf/log.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/bpf/log.c b/kernel/bpf/log.c
index 920061e38d2e..1974891fc324 100644
--- a/kernel/bpf/log.c
+++ b/kernel/bpf/log.c
@@ -11,7 +11,7 @@

bool bpf_verifier_log_attr_valid(const struct bpf_verifier_log *log)
{
- return log->len_total >= 128 && log->len_total <= UINT_MAX >> 2 &&
+ return log->len_total > 0 && log->len_total <= UINT_MAX >> 2 &&
log->level && log->ubuf && !(log->level & ~BPF_LOG_MASK);
}

--
2.34.1