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From: Arvind Sankar <nivedita@alum.mit.edu>
To: Solar Designer <solar@openwall.com>
Cc: Florian Weimer <fweimer@redhat.com>, Pavel Machek <pavel@ucw.cz>,
	madvenka@linux.microsoft.com,
	kernel-hardening@lists.openwall.com, linux-api@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-fsdevel@vger.kernel.org, linux-integrity@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	linux-security-module@vger.kernel.org, oleg@redhat.com,
	x86@kernel.org, luto@kernel.org, David.Laight@ACULAB.COM,
	mark.rutland@arm.com, mic@digikod.net,
	Rich Felker <dalias@libc.org>
Subject: Re: [PATCH v2 0/4] [RFC] Implement Trampoline File Descriptor
Date: Wed, 23 Sep 2020 14:49:30 -0400	[thread overview]
Message-ID: <20200923184930.GA1352963@rani.riverdale.lan> (raw)
In-Reply-To: <20200923181136.GA8846@openwall.com>

On Wed, Sep 23, 2020 at 08:11:36PM +0200, Solar Designer wrote:
> On Wed, Sep 23, 2020 at 04:39:31PM +0200, Florian Weimer wrote:
> > * Solar Designer:
> > 
> > > While I share my opinion here, I don't mean that to block Madhavan's
> > > work.  I'd rather defer to people more knowledgeable in current userland
> > > and ABI issues/limitations and plans on dealing with those, especially
> > > to Florian Weimer.  I haven't seen Florian say anything specific for or
> > > against Madhavan's proposal, and I'd like to.  (Have I missed that?)
> 
> [...]
> > I think it's unnecessary for the libffi use case.
> [...]
> 
> > I don't know if kernel support could
> > make sense in this context, but it would be a completely different
> > patch.
> 
> Thanks.  Are there currently relevant use cases where the proposed
> trampfd would be useful and likely actually made use of by userland -
> e.g., specific userland project developers saying they'd use it, or
> Madhavan intending to develop and contribute userland patches?
> 
> Alexander

The trampoline it provides in this version can be implemented completely
in userspace. The kernel part of it is essentially just providing a way
to do text relocations without needing a WX mapping, but the text
relocations would be unnecessary in the first place if the trampoline
was position-independent code.

  reply	other threads:[~2020-09-23 18:49 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <210d7cd762d5307c2aa1676705b392bd445f1baa>
2020-09-16 15:08 ` madvenka
2020-09-16 15:08   ` [PATCH v2 1/4] [RFC] fs/trampfd: Implement the trampoline file descriptor API madvenka
2020-09-16 15:08   ` [PATCH v2 2/4] [RFC] x86/trampfd: Provide support for the trampoline file descriptor madvenka
2020-09-16 15:08   ` [PATCH v2 3/4] [RFC] arm64/trampfd: " madvenka
2020-09-16 15:08   ` [PATCH v2 4/4] [RFC] arm/trampfd: " madvenka
2020-09-17  1:04   ` [PATCH v2 0/4] [RFC] Implement Trampoline File Descriptor Florian Weimer
2020-09-17 15:36     ` Madhavan T. Venkataraman
2020-09-17 15:57       ` Madhavan T. Venkataraman
2020-09-17 16:01         ` Florian Weimer
2020-09-23  1:46       ` Arvind Sankar
2020-09-23  9:11         ` Arvind Sankar
2020-09-23 19:17           ` Madhavan T. Venkataraman
2020-09-23 19:51             ` Arvind Sankar
2020-09-23 23:51               ` Madhavan T. Venkataraman
2020-09-24 20:23               ` Madhavan T. Venkataraman
2020-09-24 20:52                 ` Florian Weimer
2020-09-25 22:22                   ` Madhavan T. Venkataraman
2020-09-27 18:25                     ` Madhavan T. Venkataraman
2020-09-24 22:13                 ` Pavel Machek
2020-09-24 23:43                 ` Arvind Sankar
2020-09-25 22:44                   ` Madhavan T. Venkataraman
2020-09-26 15:55                     ` Arvind Sankar
2020-09-27 17:59                       ` Madhavan T. Venkataraman
2020-09-22 21:53 ` madvenka
2020-09-22 21:53   ` [PATCH v2 1/4] [RFC] fs/trampfd: Implement the trampoline file descriptor API madvenka
2020-09-22 21:53   ` [PATCH v2 2/4] [RFC] x86/trampfd: Provide support for the trampoline file descriptor madvenka
2020-09-22 21:53   ` [PATCH v2 3/4] [RFC] arm64/trampfd: " madvenka
2020-09-22 21:53   ` [PATCH v2 4/4] [RFC] arm/trampfd: " madvenka
2020-09-22 21:54   ` [PATCH v2 0/4] [RFC] Implement Trampoline File Descriptor Madhavan T. Venkataraman
2020-09-23  8:14   ` Pavel Machek
2020-09-23  9:14     ` Solar Designer
2020-09-23 14:11       ` Solar Designer
2020-09-23 15:18         ` Pavel Machek
2020-09-23 18:00           ` Solar Designer
2020-09-23 18:21             ` Solar Designer
2020-09-23 14:39       ` Florian Weimer
2020-09-23 18:09         ` Andy Lutomirski
2020-09-23 18:11         ` Solar Designer
2020-09-23 18:49           ` Arvind Sankar [this message]
2020-09-23 23:53         ` Madhavan T. Venkataraman
2020-09-23 19:41       ` Madhavan T. Venkataraman
2020-09-23 18:10     ` James Morris
2020-09-23 18:32     ` Madhavan T. Venkataraman
2020-09-23  8:42   ` Pavel Machek
2020-09-23 18:56     ` Madhavan T. Venkataraman
2020-09-23 20:51       ` Pavel Machek
2020-09-23 23:04         ` Madhavan T. Venkataraman
2020-09-24 16:44         ` Mickaël Salaün
2020-09-24 22:05           ` Pavel Machek
2020-09-25 10:12             ` Mickaël Salaün

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