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Open Source and information security mailing list archives
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Date: Tue, 27 Nov 2007 11:38:24 +1100 (EST) From: James Morris <jmorris@...ei.org> To: Eric Paris <eparis@...hat.com> cc: linux-kernel@...r.kernel.org, sds@...ho.nsa.gov, selinux@...ho.nsa.gov, alan@...hat.com, chrisw@...hat.com, hpa@...or.com, akpm@...ux-foundation.org Subject: Re: [PATCH 3/3-v2] security: allow capable check to permit mmap or low vm space On Mon, 26 Nov 2007, Eric Paris wrote: > On a kernel with CONFIG_SECURITY but without an LSM which implements > security_file_mmap it is impossible for an application to mmap addresses > lower than mmap_min_addr. Based on a suggestion from a developer in the > openwall community this patch adds a check for CAP_SYS_RAWIO. It is > assumed that any process with this capability can harm the system a lot > more easily than writing some stuff on the zero page and then trying to > get the kernel to trip over itself. It also means that programs like X > on i686 which use vm86 emulation can work even with mmap_min_addr set. > > Signed-off-by: Eric Paris <eparis@...hat.com> Applied to git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/selinux-2.6.git#for-akpm If nobody hollers, I'll push it to Linus when the next merge window opens. - James -- James Morris <jmorris@...ei.org> - 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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