From: "Madhavan T. Venkataraman" <madvenka@linux.microsoft.com>
To: David Laight <David.Laight@ACULAB.COM>,
'Mark Rutland' <mark.rutland@arm.com>
Cc: Andy Lutomirski <luto@kernel.org>,
Kernel Hardening <kernel-hardening@lists.openwall.com>,
Linux API <linux-api@vger.kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
Linux FS Devel <linux-fsdevel@vger.kernel.org>,
linux-integrity <linux-integrity@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
LSM List <linux-security-module@vger.kernel.org>,
Oleg Nesterov <oleg@redhat.com>, X86 ML <x86@kernel.org>
Subject: Re: [PATCH v1 0/4] [RFC] Implement Trampoline File Descriptor
Date: Tue, 4 Aug 2020 09:48:11 -0500
Message-ID: <5f3c9616-52f5-f539-a39f-3fd3ada4f0aa@linux.microsoft.com> (raw)
In-Reply-To: <c898918d18f34fd5b004cd1549b6a99e@AcuMS.aculab.com>
On 8/4/20 9:33 AM, David Laight wrote:
>>> If you look at the libffi reference patch I have included, the architecture
>>> specific changes to use trampfd just involve a single C function call to
>>> a common code function.
> No idea what libffi is, but it must surely be simpler to
> rewrite it to avoid nested function definitions.
Sorry if I wasn't clear.
libffi is a separate use case and GCC nested functions is a separate one.
libffi is not used to solve the nested function stuff.
For nested functions, GCC generates trampoline code and arranges to
place it on the stack and execute it.
I agree with your other points about nested function implementation.
Madhavan
> Or find a book from the 1960s on how to do recursive
> calls and nested functions in FORTRAN-IV.
>
> David
>
> -
> Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
> Registration No: 1397386 (Wales)
next prev parent reply index
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <aefc85852ea518982e74b233e11e16d2e707bc32>
2020-07-28 13:10 ` madvenka
2020-07-28 13:10 ` [PATCH v1 1/4] [RFC] fs/trampfd: Implement the trampoline file descriptor API madvenka
2020-07-28 14:50 ` Oleg Nesterov
2020-07-28 14:58 ` Madhavan T. Venkataraman
2020-07-28 16:06 ` Oleg Nesterov
2020-07-28 13:10 ` [PATCH v1 2/4] [RFC] x86/trampfd: Provide support for the trampoline file descriptor madvenka
2020-07-30 9:06 ` Greg KH
2020-07-30 14:25 ` Madhavan T. Venkataraman
2020-07-28 13:10 ` [PATCH v1 3/4] [RFC] arm64/trampfd: " madvenka
2020-07-28 13:10 ` [PATCH v1 4/4] [RFC] arm/trampfd: " madvenka
2020-07-28 15:13 ` [PATCH v1 0/4] [RFC] Implement Trampoline File Descriptor David Laight
2020-07-28 16:32 ` Madhavan T. Venkataraman
2020-07-28 17:16 ` Andy Lutomirski
2020-07-28 18:52 ` Madhavan T. Venkataraman
2020-07-29 8:36 ` David Laight
2020-07-29 17:55 ` Madhavan T. Venkataraman
[not found] ` <81d744c0-923e-35ad-6063-8b186f6a153c@linux.microsoft.com>
2020-07-29 5:16 ` Andy Lutomirski
2020-07-28 16:05 ` Casey Schaufler
2020-07-28 16:49 ` Madhavan T. Venkataraman
2020-07-28 17:05 ` James Morris
2020-07-28 17:08 ` Madhavan T. Venkataraman
2020-07-28 17:31 ` Andy Lutomirski
2020-07-28 19:01 ` Madhavan T. Venkataraman
2020-07-29 13:29 ` Florian Weimer
2020-07-30 13:09 ` David Laight
2020-08-02 11:56 ` Pavel Machek
2020-08-03 8:08 ` David Laight
2020-08-03 15:57 ` Madhavan T. Venkataraman
2020-07-30 14:42 ` Madhavan T. Venkataraman
[not found] ` <6540b4b7-3f70-adbf-c922-43886599713a@linux.microsoft.com>
2020-07-30 20:54 ` Andy Lutomirski
2020-07-31 17:13 ` Madhavan T. Venkataraman
2020-07-31 18:31 ` Mark Rutland
2020-08-03 8:27 ` David Laight
2020-08-03 16:03 ` Madhavan T. Venkataraman
2020-08-03 16:57 ` David Laight
2020-08-03 17:00 ` Madhavan T. Venkataraman
2020-08-03 17:58 ` Madhavan T. Venkataraman
2020-08-04 13:55 ` Mark Rutland
2020-08-04 14:33 ` David Laight
2020-08-04 14:44 ` David Laight
2020-08-04 14:48 ` Madhavan T. Venkataraman [this message]
2020-08-04 15:46 ` Madhavan T. Venkataraman
2020-08-02 13:57 ` Florian Weimer
2020-08-02 18:54 ` Madhavan T. Venkataraman
2020-08-02 20:00 ` Andy Lutomirski
2020-08-02 22:58 ` Madhavan T. Venkataraman
2020-08-03 18:36 ` Madhavan T. Venkataraman
2020-08-10 17:34 ` Madhavan T. Venkataraman
2020-08-11 21:12 ` Madhavan T. Venkataraman
2020-08-03 8:23 ` David Laight
2020-08-03 15:59 ` Madhavan T. Venkataraman
2020-07-31 18:09 ` Mark Rutland
2020-07-31 20:08 ` Madhavan T. Venkataraman
2020-08-03 16:57 ` Madhavan T. Venkataraman
2020-08-04 14:30 ` Mark Rutland
2020-08-06 17:26 ` Madhavan T. Venkataraman
2020-08-08 22:17 ` Pavel Machek
2020-08-11 12:41 ` Madhavan T. Venkataraman
2020-08-11 13:08 ` Pavel Machek
2020-08-11 15:54 ` Madhavan T. Venkataraman
2020-08-12 10:06 ` Mark Rutland
2020-08-12 18:47 ` Madhavan T. Venkataraman
2020-08-19 18:53 ` Mickaël Salaün
2020-09-01 15:42 ` Mark Rutland
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