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Message-ID: <Pine.BSM.4.64L.2512291543140.1510@herc.mirbsd.org>
Date: Mon, 29 Dec 2025 15:46:51 +0000 (UTC)
From: Thorsten Glaser <tg@...bsd.de>
To: musl@...ts.openwall.com
Subject: Re: Re: [PATCH] fix CMSG_NXTHDR result when cmsghdr ends
exactly before __MHDR_END
Gabriel Hansson dixit:
>To comment a bit further on this: The question is more about whether
>zero-sized payloads should be allowed or not.
I think so.
cmsg lengths are great fun anyway, see for example:
https://github.com/mirabilos/ECN-Bits/blob/master/c/lib/rdmsg.c
Basically, the actual length is the declared length minus the
length of the header… and alignment!
And yes, 0 is possible, it’s basically a flexible array member.
Thankfully, filling them is moderately more straightforward:
https://github.com/mirabilos/ECN-Bits/blob/master/c/lib/mkcmsg.c
I hadn’t tested these with musl, only glibc on Linux, WSL 1 and 2,
MidnightBSD (FreeBSD), NetBSD, Mac OSX, Android.
bye,
//mirabilos
--
<ch> you introduced a merge commit │<mika> % g rebase -i HEAD^^
<mika> sorry, no idea and rebasing just fscked │<mika> Segmentation
<ch> should have cloned into a clean repo │ fault (core dumped)
<ch> if I rebase that now, it's really ugh │<mika:#grml> wuahhhhhh
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