From: Anton Blanchard <anton@samba.org>
To: Andrew Morton <akpm@osdl.org>
Cc: Jesper Juhl <juhl-lkml@dif.dk>,
linux-kernel@vger.kernel.org, ericy@cais.com
Subject: Re: [PATCH][RFC] invalid ELF binaries can execute - better sanity checking
Date: Fri, 9 Jan 2004 15:15:36 +1100 [thread overview]
Message-ID: <20040109041536.GB25504@krispykreme> (raw)
In-Reply-To: <20040108192021.6c2aea60.akpm@osdl.org>
> I've always had little confidence in the elf loader. The problem is
> complex, the code quality is not high and the consequences of an error are
> severe.
One thing I noticed is that we only obey execute permission on load
sections. On ppc32 the PLT is in the bss area and must be executable:
[27] .sbss PROGBITS 100ba10c 0aa10c 000a14 00 WA 0 0 8
[28] .plt PROGBITS 100bab20 0aab20 000834 00 WAX 0 0 4
[29] .bss NOBITS 100bb358 0ab354 003f90 00 WA 0 0 8
When I did per page execute for ppc64 we fell apart because the current
elf loader just creates a single region of non executable memory
regardless of what the binary asks for.
Anton
next prev parent reply other threads:[~2004-01-09 4:16 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-09 2:19 Jesper Juhl
2004-01-09 2:27 ` Jesper Juhl
2004-01-09 3:20 ` Andrew Morton
2004-01-09 3:36 ` Valdis.Kletnieks
2004-01-09 3:40 ` Jesper Juhl
2004-01-09 20:20 ` Maciej Zenczykowski
2004-01-09 20:41 ` Christoph Hellwig
2004-01-10 0:27 ` Xavier Bestel
2004-01-10 2:27 ` Maciej Zenczykowski
2004-01-10 9:52 ` Xavier Bestel
2004-01-10 13:41 ` Jesper Juhl
2004-01-10 22:38 ` Maciej Zenczykowski
2004-01-10 22:45 ` Jesper Juhl
2004-01-10 14:05 ` Willy Tarreau
2004-01-22 19:24 ` [PATCH][RFC] invalid ELF binaries can execute - better sanitychecking Adrian Bunk
2004-01-09 3:36 ` [PATCH][RFC] invalid ELF binaries can execute - better sanity checking Jesper Juhl
2004-01-09 4:15 ` Anton Blanchard [this message]
2004-01-09 10:28 ` Jakub Jelinek
2004-01-09 10:50 ` Jesper Juhl
2004-01-09 18:08 ` Mike Fedyk
2004-01-09 18:25 ` Jesper Juhl
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