linux-kernel - Re: [PATCH 0/5] Collected vdso/vsyscall fixes for 3.1

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Date:	Wed, 27 Jul 2011 11:30:15 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Andrew Lutomirski <luto@....edu>
Cc:	x86@...nel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	jeremy@...p.org, keir.xen@...il.com, xen-devel@...ts.xensource.com,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH 0/5] Collected vdso/vsyscall fixes for 3.1

> > Anyhow, removed the benchmark code and ran it on 64-bit:
> >
> > sh-4.1# /test_vsyscall  test
> > Testing gettimeofday...
> > [  109.552261] test_vsyscall[2462] trap invalid opcode ip:400c8d sp:7fff84fab470 error:0 in test_vsyscall[400000+2000]
> > Illegal instruction
> > sh-4.1# /test_vsyscall  intcc
> > About to execute int 0xcc from RIP = 400959
> > [  114.137150] test_vsyscall[2463] illegal int 0xcc (exploit attempt?) ip:400959 cs:e033 sp:7fff8b328310 ax:2c si:0 di:7fff8b3280f0
> > Caught SIGSEGV: Segmentation fault (Signal sent by the kernel [(nil)])RIP = 400959
> >
> > [This is on git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git #testing, which
> > has todays linus/master and your patchset]
> >
> 
> I'll set up Xen.  Something's clearly still buggy.

You sure? This is what I get when I boot baremetal:

sh-4.1# 
sh-4.1# xen-detect 
Not running on Xen.
sh-4.1# /test_vsyscall test
Testing gettimeo[   84.442819] test_vsyscall[3175] trap invalid opcode ip:400c8d sp:7fffa8a72dc0 error:0fday...
 in test_vsyscall[400000+2000]
Illegal instruction
sh-4.1# /test_vsyscall intcc
About to execute[   87.549820] test_vsyscall[3176] illegal int 0xcc (exploit attempt?) ip:400959 cs:33 sp:7fff0ccddff0 ax:2c s^G^G^G^G^G^G^Gsh-4.1# 
sh-4.1# /test_vsyscall intcc
About to execute[   90.283817] test_vsyscall[3177] illegal int 0xcc (exploit attempt?) ip:400959 cs:33 sp:7fffae8a8b40 ax:2c son fault (Signal sent by the kernel [(nil)])RIP = 400959

Unless the whole paravirt kernel is buggy. Hadn't tried to boot non-paravirt.
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