linux-kernel - Re: [PATCH v7 6/7] mseal, system mappings: uprobe mapping

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]

Message-ID: <97c821e6-e59f-4a7b-a309-acbb81108b86@lucifer.local>
Date: Fri, 28 Feb 2025 10:39:09 +0000
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Jeff Xu <jeffxu@...omium.org>
Cc: Oleg Nesterov <oleg@...hat.com>, akpm@...ux-foundation.org,
        keescook@...omium.org, jannh@...gle.com, torvalds@...ux-foundation.org,
        vbabka@...e.cz, Liam.Howlett@...cle.com, adhemerval.zanella@...aro.org,
        avagin@...il.com, benjamin@...solutions.net,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
        linux-mm@...ck.org, jorgelo@...omium.org, sroettger@...gle.com,
        hch@....de, ojeda@...nel.org, thomas.weissschuh@...utronix.de,
        adobriyan@...il.com, johannes@...solutions.net,
        pedro.falcato@...il.com, hca@...ux.ibm.com, willy@...radead.org,
        anna-maria@...utronix.de, mark.rutland@....com,
        linus.walleij@...aro.org, Jason@...c4.com, deller@....de,
        rdunlap@...radead.org, davem@...emloft.net, peterx@...hat.com,
        f.fainelli@...il.com, gerg@...nel.org, dave.hansen@...ux.intel.com,
        mingo@...nel.org, ardb@...nel.org, mhocko@...e.com,
        42.hyeyoo@...il.com, peterz@...radead.org, ardb@...gle.com,
        enh@...gle.com, rientjes@...gle.com, groeck@...omium.org,
        mpe@...erman.id.au, aleksandr.mikhalitsyn@...onical.com,
        mike.rapoport@...il.com
Subject: Re: [PATCH v7 6/7] mseal, system mappings: uprobe mapping

On Thu, Feb 27, 2025 at 03:38:47PM -0800, Jeff Xu wrote:
> On Wed, Feb 26, 2025 at 10:25 AM Lorenzo Stoakes
> <lorenzo.stoakes@...cle.com> wrote:
> >
> > On Wed, Feb 26, 2025 at 07:20:50PM +0100, Oleg Nesterov wrote:
> > > On 02/26, Lorenzo Stoakes wrote:
> > > >
> > > > Like I said, Jeff opposes the change. I disagree with him, and agree with you,
> > > > because this is very silly.
> > > >
> > > > But I don't want to hold up this series with that discussion (this is for his
> > > > sake...)
> > >
> > > Neither me, so lets go with VM_SEALED_SYSMAP.
> > >
> > > My only objection is that
> > >
> > >       vm_flags = VM_EXEC|VM_MAYEXEC|VM_DONTCOPY|VM_IO;
> > >       vm_flags |= VM_SEALED_SYSMAP;
> > >
> > > looks unnecessarily confusing to me,
> > >
> > >       vm_flags = VM_EXEC|VM_MAYEXEC|VM_DONTCOPY|VM_IO|VM_SEALED_SYSMAP;
> > >
> > > or just
> > >
> > >       vma = _install_special_mapping(...,
> > >                               VM_EXEC|VM_MAYEXEC|VM_DONTCOPY|VM_IO|VM_SEALED_SYSMAP,
> > >                               ...
> > >
> > > looks more readable. But this is cosmetic/subjective, so I won't argue/insist.
> >
> > Agreed. This would be good.
> >
> > >
> > > > Jeff - perhaps drop this and let's return to it in a follow up so this series
> > > > isn't held up?
> > >
> > > Up to you and Jeff.
> > >
> > > But this patch looks "natural" to me in this series.
> >
> > OK, I mean in that case I'm ok with it as-is, as you confirms there's no
> > issue, I've looked at the code and there's no issue.
> >
> > It was only if we wanted to try the VM_SEALED thing, i.e. _always_ seal
> > then it'd do better outside of the series as there'd be a discussion about
> > maybe changing this CONFIG_64BIT thing yada yada.
> >
> > >
> > > Oleg.
> > >
> >
> > Jeff - in that case, do NOT drop this one :P but do please look at the
> > above style nit.
> >
> Ok.

Thanks :)

>
>
> > Let's keep things moving... :)