linux-kernel - Re: [PATCH] kcmp: add separate Kconfig symbol for kcmp syscall

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]

Message-ID: <20200710155719.GN12769@casper.infradead.org>
Date:   Fri, 10 Jul 2020 16:57:19 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     Cyrill Gorcunov <gorcunov@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kcmp: add separate Kconfig symbol for kcmp syscall

On Fri, Jul 10, 2020 at 09:56:31AM +0200, Rasmus Villemoes wrote:
> The ability to check open file descriptions for equality (without
> resorting to unreliable fstat() and fcntl(F_GETFL) comparisons) can be
> useful outside of the checkpoint/restore use case - for example,
> systemd uses kcmp() to deduplicate the per-service file descriptor
> store.
> 
> Make it possible to have the kcmp() syscall without the full
> CONFIG_CHECKPOINT_RESTORE.

If systemd is using it, is it even worth making it conditional any more?
Maybe for CONFIG_EXPERT builds, it could be de-selectable.