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Message-ID: <4833013D.8020506@qumranet.com> Date: Tue, 20 May 2008 19:50:05 +0300 From: Avi Kivity <avi@...ranet.com> To: Pavel Machek <pavel@...e.cz> CC: Andrew Morton <akpm@...l.org>, Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org Subject: Re: [PATCH] Make LIST_POISON less deadly Pavel Machek wrote: > On Sun 2008-05-18 18:38:14, Avi Kivity wrote: > >> The list macros use LIST_POISON1 and LIST_POISON2 as undereferencable >> pointers in order to trap erronous use of freed list_heads. Unfortunately >> userspace can arrange for those pointers to actually be dereferencable, >> potentially turning an oops to an expolit. >> >> To avoid this allow architectures (currently x86_64 only) to override >> the default values for these pointers with truly-undereferncable values. >> This is easy on x86_64 as the virtual address space is smaller than >> the range spanned by pointer values. >> > > "Security hole unless arch maintainer does _foo_" sounds > scary. Especially when i386 is hard to fix... > It's a potential security hole. You need to find a list corruption first. The patch prevents escalation of the oops into a code injection. i386 is fixable, though it will take more work than x86_64. -- error compiling committee.c: too many arguments to function -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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