From: Konrad Rzeszutek Wilk Subject: Re: [PATCH 0/5] Collected vdso/vsyscall fixes for 3.1 Date: Wed, 27 Jul 2011 11:30:15 -0400 Message-ID: <20110727153015.GA16688@dumpdata.com> References: <20110727145745.GA11872@dumpdata.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Return-path: Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Andrew Lutomirski Cc: jeremy@goop.org, xen-devel@lists.xensource.com, x86@kernel.org, Linux Kernel Mailing List , virtualization@lists.linux-foundation.org, keir.xen@gmail.com List-Id: xen-devel@lists.xenproject.org > > Anyhow, removed the benchmark code and ran it on 64-bit: > > > > sh-4.1# /test_vsyscall =A0test > > Testing gettimeofday... > > [ =A0109.552261] test_vsyscall[2462] trap invalid opcode ip:400c8d sp= :7fff84fab470 error:0 in test_vsyscall[400000+2000] > > Illegal instruction > > sh-4.1# /test_vsyscall =A0intcc > > About to execute int 0xcc from RIP =3D 400959 > > [ =A0114.137150] test_vsyscall[2463] illegal int 0xcc (exploit attemp= t?) ip:400959 cs:e033 sp:7fff8b328310 ax:2c si:0 di:7fff8b3280f0 > > Caught SIGSEGV: Segmentation fault (Signal sent by the kernel [(nil)]= )RIP =3D 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] > > >=20 > I'll set up Xen. Something's clearly still buggy. You sure? This is what I get when I boot baremetal: sh-4.1#=20 sh-4.1# xen-detect=20 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 (expl= oit attempt?) ip:400959 cs:33 sp:7fff0ccddff0 ax:2c s^G^G^G^G^G^G^Gsh-4.1= #=20 sh-4.1# /test_vsyscall intcc About to execute[ 90.283817] test_vsyscall[3177] illegal int 0xcc (expl= oit attempt?) ip:400959 cs:33 sp:7fffae8a8b40 ax:2c son fault (Signal sen= t by the kernel [(nil)])RIP =3D 400959 Unless the whole paravirt kernel is buggy. Hadn't tried to boot non-parav= irt.