From: Oleg Nesterov <oleg@redhat.com>
To: Tycho Andersen <tycho@tycho.pizza>
Cc: coverity-bot <keescook@chromium.org>,
Christian Brauner <brauner@kernel.org>,
Nicholas Piggin <npiggin@gmail.com>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Peng Zhang <zhangpeng.00@bytedance.com>,
Ard Biesheuvel <ardb@kernel.org>,
Luis Chamberlain <mcgrof@kernel.org>,
Heiko Carstens <hca@linux.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Suren Baghdasaryan <surenb@google.com>,
Thomas Gleixner <tglx@linutronix.de>,
Mateusz Guzik <mjguzik@gmail.com>,
Dmitry Vyukov <dvyukov@google.com>,
Tycho Andersen <tandersen@netflix.com>,
Mike Christie <michael.christie@oracle.com>,
"Paul E. McKenney" <paulmck@kernel.org>,
linux-kernel@vger.kernel.org,
"Gustavo A. R. Silva" <gustavo@embeddedor.com>,
linux-next@vger.kernel.org, linux-hardening@vger.kernel.org
Subject: Re: Coverity: __do_sys_pidfd_send_signal(): UNINIT
Date: Wed, 14 Feb 2024 18:55:55 +0100 [thread overview]
Message-ID: <20240214175555.GC16265@redhat.com> (raw)
In-Reply-To: <ZczLyDCN+zG6imTd@tycho.pizza>
Hi Tycho,
let me repeat just in case, I am fine either way, whatever you and
Christian prefer. In particular, I agree in advance if you decide
to not change the current code, it is correct even if it can fool
the tools.
That said,
On 02/14, Tycho Andersen wrote:
>
> On Wed, Feb 14, 2024 at 10:06:41AM +0100, Oleg Nesterov wrote:
> >
> > - /* Ensure that only a single signal scope determining flag is set. */
> > - if (hweight32(flags & PIDFD_SEND_SIGNAL_FLAGS) > 1)
> > + switch (flags) {
> > + case 0:
> > + /* but see the PIDFD_THREAD check below */
>
> Why not put that bit inline?
Not sure I understand what does "inline" mean... but let me reply
anyway.
We want to check the "flags" argument at the start, we do not want to
delay the "case 0:" check until we have f.file (so that we can check
f.file->f_flags).
but perhaps this is another case when I misunderstand you.
> But I guess the hweight and flags mask
> are intended to be future proofness for flags that don't fit into this
> switch.
Yes I see, but
> That said, your patch reads better than the way it is in the
> tree and is what I was thinking.
this was my point.
And if we add more flags, we will need to update the "switch" stmt anyway.
But again, I won't insist. This is cosmetic afer all.
Oleg.
next prev parent reply other threads:[~2024-02-14 17:57 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-13 23:59 Coverity: __do_sys_pidfd_send_signal(): UNINIT coverity-bot
2024-02-14 0:18 ` Tycho Andersen
2024-02-14 9:03 ` Oleg Nesterov
2024-02-14 9:06 ` Oleg Nesterov
2024-02-14 14:18 ` Tycho Andersen
2024-02-14 17:55 ` Oleg Nesterov [this message]
2024-02-14 18:11 ` Tycho Andersen
2024-02-14 19:18 ` Oleg Nesterov
2024-02-16 12:37 ` Christian Brauner
2024-02-14 18:51 ` Kees Cook
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20240214175555.GC16265@redhat.com \
--to=oleg@redhat.com \
--cc=akpm@linux-foundation.org \
--cc=ardb@kernel.org \
--cc=bigeasy@linutronix.de \
--cc=brauner@kernel.org \
--cc=dvyukov@google.com \
--cc=gustavo@embeddedor.com \
--cc=hca@linux.ibm.com \
--cc=keescook@chromium.org \
--cc=linux-hardening@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-next@vger.kernel.org \
--cc=mcgrof@kernel.org \
--cc=michael.christie@oracle.com \
--cc=mjguzik@gmail.com \
--cc=npiggin@gmail.com \
--cc=paulmck@kernel.org \
--cc=surenb@google.com \
--cc=tandersen@netflix.com \
--cc=tglx@linutronix.de \
--cc=tycho@tycho.pizza \
--cc=zhangpeng.00@bytedance.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).