From: Andrii Nakryiko <andrii@kernel.org>
To: <bpf@vger.kernel.org>, <ast@kernel.org>, <daniel@iogearbox.net>,
<martin.lau@kernel.org>
Cc: <andrii@kernel.org>, <kernel-team@meta.com>
Subject: [PATCH bpf-next 2/6] bpf: remove minimum size restrictions on verifier log buffer
Date: Fri, 17 Mar 2023 15:03:47 -0700 [thread overview]
Message-ID: <20230317220351.2970665-3-andrii@kernel.org> (raw)
In-Reply-To: <20230317220351.2970665-1-andrii@kernel.org>
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
next prev parent reply other threads:[~2023-03-17 22:04 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-17 22:03 [PATCH bpf-next 0/6] BPF verifier rotating log Andrii Nakryiko
2023-03-17 22:03 ` [PATCH bpf-next 1/6] bpf: split off basic BPF verifier log into separate file Andrii Nakryiko
2023-03-17 22:03 ` Andrii Nakryiko [this message]
2023-03-17 22:03 ` [PATCH bpf-next 3/6] bpf: switch BPF verifier log to be a rotating log by default Andrii Nakryiko
2023-03-17 22:05 ` Andrii Nakryiko
2023-03-17 23:02 ` Daniel Borkmann
2023-03-17 23:12 ` Andrii Nakryiko
2023-03-20 16:10 ` Lorenz Bauer
2023-03-20 18:55 ` Andrii Nakryiko
2023-03-21 16:18 ` Lorenz Bauer
2023-03-22 21:27 ` Andrii Nakryiko
2023-03-17 22:03 ` [PATCH bpf-next 4/6] libbpf: don't enfore verifier log levels on libbpf side Andrii Nakryiko
2023-03-17 22:03 ` [PATCH bpf-next 5/6] selftests/bpf: add more veristat control over verifier log options Andrii Nakryiko
2023-03-17 22:03 ` [PATCH bpf-next 6/6] selftests/bpf: add fixed vs rotating verifier log tests Andrii Nakryiko
-- strict thread matches above, loose matches on Subject: below --
2023-03-16 18:30 [PATCH bpf-next 0/6] BPF verifier rotating log Andrii Nakryiko
2023-03-16 18:30 ` [PATCH bpf-next 2/6] bpf: remove minimum size restrictions on verifier log buffer Andrii Nakryiko
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