Date: Tue, 6 Sep 2011 09:05:54 +0400 From: Solar Designer <solar@...nwall.com> To: kernel-hardening@...ts.openwall.com Subject: Re: [RFC] x86, mm: start mmap allocation for libs from low addresses On Mon, Sep 05, 2011 at 04:46:47PM +0400, Vasiliy Kulikov wrote: > Hmm, yes, looks like I've lost the thread some time ago :( A good > description definitely needs much longer and scrupulous analysis. Or alternatively it may choose not to go into detail at all, which is a safer bet. ;-) > Probably there is a public paper with a review/analysis/benefits of > ASCII-armor that we're able to refer in the patch description? I cannot > find any rigorous paper, unfortunately. I'm not aware of such paper. > On Sun, Sep 04, 2011 at 03:57 +0400, Solar Designer wrote: > > solar@...t:~/kernel/mainline/linux-3.0.4 $ fgrep -rl CONFIG_VM86 . > > ./arch/x86/kernel/Makefile > > ./arch/x86/kernel/entry_32.S > > ./arch/x86/include/asm/vm86.h > > ./arch/x86/include/asm/processor-flags.h > > > > Looks like there's no Kconfig option for this - perhaps add it with a > > separate patch? > > Since 2.6.x CONFIG_ prefix is not used in Kconfig files: > > $ grep -w VM86 arch/x86/Kconfig > config VM86 > bool "Enable VM86 support" if EXPERT Oh, of course. Sometimes I say/do dumb things. Turns out this stuff is also present in RHEL5/OpenVZ kernels, so we might want to turn on CONFIG_EMBEDDED and disable CONFIG_VM86 in Owl kernel builds, even before we move to newer kernels. Alexander
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