linux-ext4 - Re: [bug report] misc/fsck.c: Processes may kill other processes.

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Date:   Mon, 10 Oct 2022 10:09:44 +0200
From:   Karel Zak <kzak@...hat.com>
To:     Lukas Czerner <lczerner@...hat.com>
Cc:     zhanchengbin <zhanchengbin1@...wei.com>,
        Theodore Ts'o <tytso@....edu>, linux-ext4@...r.kernel.org,
        liuzhiqiang26@...wei.com, linfeilong <linfeilong@...wei.com>
Subject: Re: [bug report] misc/fsck.c: Processes may kill other processes.

On Fri, Sep 30, 2022 at 09:20:42AM +0200, Lukas Czerner wrote:
> On Fri, Sep 30, 2022 at 09:42:52AM +0800, zhanchengbin wrote:
> > 
> > 
> > On 2022/9/29 19:28, Lukas Czerner wrote:
> > > Hi,
> > > 
> > > indeed we'd like to avoid killing the instance that was not ran because
> > > of noexecute. Can you try the following patch?
> > > 
> > > Thanks!
> > > -Lukas
> > 
> > Yes, you're right, I think we can fix it in this way.
> > 
> > diff --git a/misc/fsck.c b/misc/fsck.c
> > index 1f6ec7d9..91edbf17 100644
> > --- a/misc/fsck.c
> > +++ b/misc/fsck.c
> > @@ -547,6 +547,8 @@ static int kill_all(int signum)
> >         for (inst = instance_list; inst; inst = inst->next) {
> >                 if (inst->flags & FLAG_DONE)
> >                         continue;
> > +               if (inst->pid == -1)
> > +                       continue;
> 
> Yeah, that works as well although I find the "if (noexecute)" condition
> more obvious. We can do both. Also rather than checking for -1 we can
> check for <= 0 since anything other than real pid at this point is a bug.
> 
> Feel free to send a proper patch.

Yes, please. It would be nice to have the same solution in the both
(e2fsprogs and util-linux) trees.

    Karel

-- 
 Karel Zak  <kzak@...hat.com>
 http://karelzak.blogspot.com