From: Gregory Price <gourry@gourry.net>
To: Thomas Gleixner <tglx@kernel.org>
Cc: linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
kernel-team@meta.com, corbet@lwn.net, skhan@linuxfoundation.org,
peterz@infradead.org, luto@kernel.org, akpm@linux-foundation.org,
feng.tang@linux.alibaba.com, pmladek@suse.com,
mhiramat@kernel.org, marc.herbert@linux.intel.com,
joel.granados@kernel.org, lirongqing@baidu.com, kees@kernel.org,
nathan@kernel.org, linusw@kernel.org, arnd@arndb.de,
deller@gmx.de, jpoimboe@kernel.org, ruanjinjie@huawei.com,
lukas.bulwahn@redhat.com, ryan.roberts@arm.com, ojeda@kernel.org
Subject: Re: [PATCH 2/2] kernel/entry: add kernel.syscall_user_dispatch sysctl
Date: Fri, 3 Jul 2026 13:26:17 -0400 [thread overview]
Message-ID: <akfwuanT7Ot3KD6R@fedora> (raw)
In-Reply-To: <877bncm5y7.ffs@fw13>
> > + /* Arming can be denied at runtime via sysctl, disarming is allowed */
> > + if (mode != PR_SYS_DISPATCH_OFF && !syscall_user_dispatch_allowed)
> > + return -EPERM;
>
> That might be similar to other sysctls, but if an application had it
> enabled prior to the sysctl=off toggle, then that application will
> suddenly fail in operation if it requires to move the dispatch window.
>
If the admin is turning it off globally, is that not exactly what the
admin wants? The alternative is a hard disable that will simply result
in undefined behavior (windows syscall ABI being interpreted at a linux
syscall) instead of failing gracefully on the re-arm.
This seemed like the better option.
~Gregory
next prev parent reply other threads:[~2026-07-03 17:26 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-27 20:55 [PATCH 1/2] kernel/entry: add CONFIG_SYSCALL_USER_DISPATCH to compile SUD out Gregory Price
2026-06-27 20:55 ` [PATCH 2/2] kernel/entry: add kernel.syscall_user_dispatch sysctl Gregory Price
2026-07-03 15:46 ` Thomas Gleixner
2026-07-03 17:26 ` Gregory Price [this message]
2026-07-03 19:06 ` Thomas Gleixner
2026-07-03 15:39 ` [PATCH 1/2] kernel/entry: add CONFIG_SYSCALL_USER_DISPATCH to compile SUD out Thomas Gleixner
2026-07-03 17:22 ` Gregory Price
2026-07-03 19:05 ` Thomas Gleixner
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