From: Jakub Sitnicki <jakub@cloudflare.com>
To: linux-man@vger.kernel.org
Cc: bpf@vger.kernel.org, Alejandro Colomar <alx.manpages@gmail.com>,
Michael Kerrisk <mtk.manpages@gmail.com>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>
Subject: [PATCH] bpf.2: Note that unused fields and padding in bpf_attr must be zero
Date: Mon, 25 Apr 2022 18:08:03 +0200 [thread overview]
Message-ID: <20220425160803.114851-1-jakub@cloudflare.com> (raw)
In a discussion regarding a potential backward incompatible change [1],
Andrii Nakryiko points out that unused bytes of bpf_attr should be
zero. Add this bit of information to the bpf(2) man page.
[1] https://lore.kernel.org/bpf/CAEf4BzbT4vQBnZzdD00SuPCDkeb4Cm=F6PLUoO_3X93UQD5hbQ@mail.gmail.com/
Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
---
man2/bpf.2 | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/man2/bpf.2 b/man2/bpf.2
index 2d257eaa6..ee57226ee 100644
--- a/man2/bpf.2
+++ b/man2/bpf.2
@@ -142,7 +142,7 @@ provided via
.IR attr ,
which is a pointer to a union of type
.I bpf_attr
-(see below).
+(see below). The unused fields and padding must be zeroed out before the call.
The
.I size
argument is the size of the union pointed to by
--
2.35.1
next reply other threads:[~2022-04-25 16:08 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-25 16:08 Jakub Sitnicki [this message]
2022-04-25 21:01 ` [PATCH] bpf.2: Note that unused fields and padding in bpf_attr must be zero Alejandro Colomar
2022-04-26 9:05 ` Jakub Sitnicki
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