netdev - Re: [PATCH v1 net] net: Allow larger buffer than peer address for SO

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Message-ID: <20230821191113.72311580@kernel.org>
Date: Mon, 21 Aug 2023 19:11:13 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Kuniyuki Iwashima <kuniyu@...zon.com>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Kuniyuki Iwashima
 <kuni1840@...il.com>, <netdev@...r.kernel.org>
Subject: Re: [PATCH v1 net] net: Allow larger buffer than peer address for
 SO_PEERNAME.

On Fri, 18 Aug 2023 17:55:52 -0700 Kuniyuki Iwashima wrote:
> For example, we usually do not know the peer name if we get an AF_UNIX
> socket by accept(), FD passing, or pidfd_getfd().  Then we get -EINVAL
> if we pass sizeof(struct sockaddr_un) to getsockopt(SO_PEERNAME).  So,
> we need to do binary search to get the exact peer name.

Sounds annoying indeed, but is it really a fix?