linux-kernel - Re: [PATCH 1/4] mm/gup: Add FOLL

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Thu, 7 Jul 2022 11:06:49 -0400
From:   Peter Xu <peterx@...hat.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Linux MM Mailing List <linux-mm@...ck.org>,
        Sean Christopherson <seanjc@...gle.com>
Subject: Re: [PATCH 1/4] mm/gup: Add FOLL_INTERRUPTIBLE

On Mon, Jul 04, 2022 at 11:48:17PM +0100, Matthew Wilcox wrote:
> On Wed, Jun 22, 2022 at 05:36:53PM -0400, Peter Xu wrote:
> > +/*
> > + * GUP always responds to fatal signals.  When FOLL_INTERRUPTIBLE is
> > + * specified, it'll also respond to generic signals.  The caller of GUP
> > + * that has FOLL_INTERRUPTIBLE should take care of the GUP interruption.
> > + */
> > +static bool gup_signal_pending(unsigned int flags)
> > +{
> > +	if (fatal_signal_pending(current))
> > +		return true;
> > +
> > +	if (!(flags & FOLL_INTERRUPTIBLE))
> > +		return false;
> > +
> > +	return signal_pending(current);
> > +}
> 
> This should resemble signal_pending_state() more closely, if indeed not
> be a wrapper of signal_pending_state().

Could you be more specific?  Note that the only thing that should affect
the signal handling here is FOLL_INTERRUPTIBLE, we don't allow anything
else being passed in, e.g. we don't take TASK_INTERRUPTIBLE or TASK_*.

Thanks,

-- 
Peter Xu