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From: Matthew Wilcox <willy@infradead.org>
To: Gabriel Krisman Bertazi <krisman@collabora.com>
Cc: tglx@linutronix.de, linux-kernel@vger.kernel.org,
	kernel@collabora.com, luto@kernel.org, gofmanp@gmail.com,
	keescook@chromium.org, linux-kselftest@vger.kernel.org,
	shuah@kernel.org
Subject: Re: [PATCH v4 1/2] kernel: Implement selective syscall userspace redirection
Date: Thu, 16 Jul 2020 22:06:01 +0100	[thread overview]
Message-ID: <20200716210601.GN12769@casper.infradead.org> (raw)
In-Reply-To: <20200716193141.4068476-2-krisman@collabora.com>

On Thu, Jul 16, 2020 at 03:31:40PM -0400, Gabriel Krisman Bertazi wrote:
> selector is an optional pointer to a char-sized userspace memory region
> that has a key switch for the mechanism. This key switch is set to
> either PR_SYS_DISPATCH_ON, PR_SYS_DISPATCH_OFF to enable and disable the
> redirection without calling the kernel.
> 
> The feature is meant to be set per-thread and it is disabled on
> fork/clone/execv.

Disabled on exec.  Disabled in the child on clone/fork (and vfork, I
think).

That means we don't need to worry about it interacting badly with
a setuid program, right?


  reply	other threads:[~2020-07-16 21:06 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-16 19:31 [PATCH v4 0/2] Syscall User Redirection Gabriel Krisman Bertazi
2020-07-16 19:31 ` [PATCH v4 1/2] kernel: Implement selective syscall userspace redirection Gabriel Krisman Bertazi
2020-07-16 21:06   ` Matthew Wilcox [this message]
2020-07-16 21:26     ` Kees Cook
2020-07-17  0:20   ` Andy Lutomirski
2020-07-17  2:15     ` Gabriel Krisman Bertazi
2020-07-17  4:48       ` Andy Lutomirski
2020-07-21 12:06         ` Mark Rutland
2020-07-20  9:23     ` Thomas Gleixner
2020-07-20  9:44       ` Will Deacon
2020-07-20 10:08   ` Thomas Gleixner
2020-07-20 13:46     ` Gabriel Krisman Bertazi
2020-07-16 19:31 ` [PATCH v4 2/2] selftests: Add kselftest for syscall user dispatch Gabriel Krisman Bertazi
2020-07-16 20:04 ` [PATCH v4 0/2] Syscall User Redirection Kees Cook
2020-07-16 20:22   ` Christian Brauner
2020-07-16 20:25     ` Kees Cook
2020-07-16 20:29       ` Christian Brauner
2020-07-16 20:30         ` Gabriel Krisman Bertazi
2020-07-16 21:06           ` Carlos O'Donell
2020-08-02 12:01 ` Pavel Machek
2020-08-04 14:26   ` Gabriel Krisman Bertazi

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