netdev - Re: [PATCH net v2] scm: fix negative fds with SO

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Message-ID: <CAJqdLrr1oet6F_EQSaiSfwnMCvt0Omvicw5Ed7FkiyrQagfgMQ@mail.gmail.com>
Date: Mon, 18 Nov 2024 15:59:50 +0100
From: Alexander Mikhalitsyn <alexander@...alicyn.com>
To: stsp <stsp2@...dex.ru>
Cc: linux-kernel@...r.kernel.org, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Simon Horman <horms@...nel.org>, Christian Brauner <brauner@...nel.org>, Kees Cook <kees@...nel.org>, 
	Kuniyuki Iwashima <kuniyu@...zon.com>, netdev@...r.kernel.org
Subject: Re: [PATCH net v2] scm: fix negative fds with SO_PASSPIDFD

Am So., 17. Nov. 2024 um 11:11 Uhr schrieb stsp <stsp2@...dex.ru>:
>
> 17.11.2024 13:04, stsp пишет:
> > 17.11.2024 12:40, Alexander Mikhalitsyn пишет:
> >> Hi Stas,
> >>
> >> Actually, it's not a forgotten check. It's intended behavior to pass
> >> through errors from pidfd_prepare() to
> >> the userspace. In my first version [1] of the patch I tried to return
> >> ESRCH instead of EINVAL in your case, but
> >> then during discussions we decided to remove that.
> >>
> >> [1]
> >> https://lore.kernel.org/all/20230316131526.283569-2-aleksandr.mikhalitsyn@canonical.com/
> > Yes, the patch you referenced above,
> > only calls put_cmsg() with an error code.
> >
> > But the code I can see now in git, does
> > much more. Namely,
> > if (pidfd_file)
> >     fd_install(pidfd, pidfd_file);
> Ah, I guess pidfd_file is a culprit.

Hey,

Precisely, when an error happens then pidfd_file is NULL.

Kind regards,
Alex

> Thanks.