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From: "Ahmed S. Darwish" <darwish.07@gmail.com>
To: "Linus Torvalds" <torvalds@linux-foundation.org>
Cc: "Pavel Machek" <pavel@ucw.cz>,
	"Casey Schaufler" <casey@schaufler-ca.com>,
	akpm@linux-foundation.org, linux-security-module@vger.kernel.org,
	linux-kernel@vger.kernel.org, "Al Viro" <viro@ftp.linux.org.uk>
Subject: Re: [PATCH] Smackv10: Smack rules grammar + their stateful parser
Date: Tue, 6 Nov 2007 01:38:22 +0200
Message-ID: <1865922a0711051538n61c5d979kac61652166da14e2@mail.gmail.com> (raw)
In-Reply-To: <alpine.LFD.0.999.0711050818200.15101@woody.linux-foundation.org>

On 11/5/07, Linus Torvalds <torvalds@linux-foundation.org> wrote:
>
>
> On Mon, 5 Nov 2007, Ahmed S. Darwish wrote:
>
> > On Sun, Nov 04, 2007 at 12:28:48PM +0000, Pavel Machek wrote:
> > >
> > > Can we avoid string parsers in the kernel?
> > >
> >
> > Ok, Could someone suggest a better idea please ?.
>
> I personally think string parsers are *much* better than the alternatives
> (which basically boil down to nasty binary interfaces)
>
> > I thought about packing the rules in a structure and sending
> > it over an ioctl() command. Is this applicable ?
>
> That's *MUCH* worse.
>
> Strings are nice. They aren't that complex, and as long as it's not a
> performance-critical area, there are basically no downsides.
>
> Binary structures and ioctl's are *much* worse. They are totally
> undebuggable with generic tools (think "echo" or "strace"), and they are a
> total nightmare to parse across architectures and pointer sizes.
>
> So the rule should be: always use strings if at all possible and relevant.
> If the data is fundamentally binary, it shouldn't be re-coded to ascii (no
> real advantage), but if the data is "stringish", and there aren't big
> performance issues, then keep it as strings.
>

Thanks a lot for such a kind advice. I'll keep that in my mind.

Regards,

-- 
Ahmed S. Darwish
Homepage: http://darwish.07.googlepages.com
Blog: http://darwish-07.blogspot.com

  parent reply index

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-11-02 20:50 [PATCH] Version 10 (2.6.24-rc1) Smack: Simplified Mandatory Access Control Kernel Casey Schaufler
2007-11-03 16:43 ` [PATCH] Smackv10: Smack rules grammar + their stateful parser Ahmed S. Darwish
2007-11-03 18:30   ` Kyle Moffett
2007-11-03 22:12     ` Ahmed S. Darwish
2007-11-04 12:28   ` Pavel Machek
2007-11-04 13:23     ` Ahmed S. Darwish
2007-11-04 16:37       ` Casey Schaufler
2007-11-05  9:41     ` Ahmed S. Darwish
2007-11-05 16:21       ` Linus Torvalds
2007-11-05 21:56         ` Tetsuo Handa
2007-11-06 10:00           ` Adrian Bunk
2007-11-06 12:27             ` Tetsuo Handa
2007-11-06 13:58               ` Adrian Bunk
2007-11-06 14:32                 ` Tetsuo Handa
2007-11-06 14:59                   ` Adrian Bunk
2007-11-06 15:27                     ` Tetsuo Handa
2007-11-06 22:42                       ` Adrian Bunk
2007-11-05 23:38         ` Ahmed S. Darwish [this message]
2007-11-06  8:06         ` Adrian Bunk
2007-11-06 15:39           ` Linus Torvalds
2007-11-06 23:00             ` Adrian Bunk
2007-11-06 23:08               ` Linus Torvalds
2007-11-07  0:07                 ` Adrian Bunk
2007-11-07  0:27                   ` Linus Torvalds
2007-11-07  0:43                     ` Adrian Bunk
2007-11-07  1:03                       ` Tetsuo Handa
2007-11-07  1:06                       ` Linus Torvalds
2007-11-07  1:59                         ` Adrian Bunk
2007-11-07  4:09                           ` Linus Torvalds
2007-11-07 15:08                           ` Alan Cox
2007-11-04 20:06   ` Ahmed S. Darwish
2007-11-05  0:56   ` [PATCH] Smackv10: Smack rules grammar + their stateful parser(2) Ahmed S. Darwish
2007-11-10 17:05     ` Jakob Oestergaard
2007-11-10 19:45       ` Ahmed S. Darwish
2007-11-11 12:44     ` Pavel Machek
2007-11-11 18:37       ` Ahmed S. Darwish
2007-11-06  6:33   ` [PATCH] Smackv10: Smack rules grammar + their stateful parser Adrian Bunk
2007-11-06  8:26     ` Kyle Moffett
2007-11-06  8:56       ` Adrian Bunk
2007-11-06 11:02         ` Alan Cox
2007-11-06 11:34         ` Ahmed S. Darwish
2007-11-06 11:47           ` Adrian Bunk
2007-11-06 12:23             ` Ahmed S. Darwish
2007-11-06 12:49               ` Kyle Moffett
2007-11-06 13:34                 ` Adrian Bunk
2007-11-06 14:05                   ` Ahmed S. Darwish
2007-11-06 14:10                     ` Adrian Bunk
2007-11-06 14:30                       ` Ahmed S. Darwish
2007-11-06 15:53                 ` Linus Torvalds
2007-11-07 10:56                   ` [PATCH] Fix isspace() and other ctype.h functions to ignore chars 128-255 Kyle Moffett

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