linux-kernel - Re: Add a new fchmodat4() syscall, v2

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: Windows password security audit tool. GUI, reports in PDF.

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

Date:   Tue, 09 Jun 2020 15:52:17 +0200
From:   Florian Weimer <fweimer@...hat.com>
To:     Palmer Dabbelt <palmer@...ive.com>
Cc:     viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-api@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>, rth@...ddle.net,
        ink@...assic.park.msu.ru, mattst88@...il.com,
        linux@...linux.org.uk, catalin.marinas@....com, will@...nel.org,
        tony.luck@...el.com, fenghua.yu@...el.com, geert@...ux-m68k.org,
        monstr@...str.eu, ralf@...ux-mips.org, paul.burton@...s.com,
        jhogan@...nel.org, James.Bottomley@...senPartnership.com,
        deller@....de, benh@...nel.crashing.org, paulus@...ba.org,
        mpe@...erman.id.au, heiko.carstens@...ibm.com, gor@...ux.ibm.com,
        borntraeger@...ibm.com, ysato@...rs.sourceforge.jp,
        dalias@...c.org, davem@...emloft.net, luto@...nel.org,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        x86@...nel.org, peterz@...radead.org, acme@...nel.org,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, dhowells@...hat.com, firoz.khan@...aro.org,
        stefan@...er.ch, schwidefsky@...ibm.com, axboe@...nel.dk,
        christian@...uner.io, hare@...e.com, deepa.kernel@...il.com,
        tycho@...ho.ws, kim.phillips@....com, linux-alpha@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org,
        linux-m68k@...ts.linux-m68k.org, linux-mips@...r.kernel.org,
        linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
        sparclinux@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: Add a new fchmodat4() syscall, v2

* Palmer Dabbelt:

> This patch set adds fchmodat4(), a new syscall. The actual
> implementation is super simple: essentially it's just the same as
> fchmodat(), but LOOKUP_FOLLOW is conditionally set based on the flags.
> I've attempted to make this match "man 2 fchmodat" as closely as
> possible, which says EINVAL is returned for invalid flags (as opposed to
> ENOTSUPP, which is currently returned by glibc for AT_SYMLINK_NOFOLLOW).
> I have a sketch of a glibc patch that I haven't even compiled yet, but
> seems fairly straight-forward:

What's the status here?  We'd really like to see this system call in the
kernel because our emulation in glibc has its problems (especially if
/proc is not mounted).

Thanks,
Florian