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Date: Thu, 7 Aug 2008 09:49:20 +0200 From: Pavel Machek <pavel@...e.cz> To: Michael Davidson <md@...gle.com> Cc: mingo@...hat.com, tglx@...utronix.de, linux-kernel@...r.kernel.org Subject: Re: [PATCH] x86: prevent binaries from making system calls using the wrong syscall interface > Prevent binaries from making system calls using other than one > of the "normal" system call interfaces for that binary type. > > Currently there is nothing to prevent 64 bit binaries from > attempting to make system calls using the 32 bit system call > interfaces and vice versa. I thought this was a feature? > Index: linux-2.6.26.2/arch/x86/ia32/ia32entry.S > =================================================================== > --- linux-2.6.26.2.orig/arch/x86/ia32/ia32entry.S 2008-08-06 09:19:01.000000000 -0700 > +++ linux-2.6.26.2/arch/x86/ia32/ia32entry.S 2008-08-06 13:34:54.566992000 -0700 > @@ -123,6 +123,8 @@ > .quad 1b,ia32_badarg > .previous > GET_THREAD_INFO(%r10) > + testl $_TIF_IA32,threadinfo_flags(%r10) > + jz ia32_bad_abi > orl $TS_COMPAT,threadinfo_status(%r10) > testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP),threadinfo_flags(%r10) > CFI_REMEMBER_STATE ...and slowing down all syscalls for this is certainly bad idea. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- 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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