From: Baoquan He <bhe@redhat.com>
To: Brian Gerst <brgerst@gmail.com>
Cc: Borislav Petkov <bp@alien8.de>, Yinghai Lu <yinghai@kernel.org>,
Juergen Gross <jgross@suse.com>,
thgarnie@google.com, Andy Lutomirski <luto@kernel.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Alexander Kuleshov <kuleshovmail@gmail.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
borntraeger@de.ibm.com, sds@tycho.nsa.gov,
kirill.shutemov@linux.intel.com, jroedel@suse.de,
Kees Cook <keescook@chromium.org>,
"Williams, Dan J" <dan.j.williams@intel.com>,
Mark Salter <msalter@redhat.com>, Borislav Petkov <bp@suse.de>,
corbet@lwn.net, matt@codeblueprint.co.uk,
guangrong.xiao@linux.intel.com, aneesh.kumar@linux.vnet.ibm.com,
Ingo Molnar <mingo@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
toshi.kani@hpe.com, alpopov@ptsecurity.com,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Jan Beulich <JBeulich@suse.com>,
Andrew Morton <akpm@linux-foundation.org>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Denys Vlasenko <dvlasenk@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
dyoung@redhat.com, Thomas Gleixner <tglx@linutronix.de>,
Dmitry Vyukov <dvyukov@google.com>,
lv.zheng@intel.com, schwidefsky@de.ibm.com,
linux-tip-commits@vger.kernel.org
Subject: Re: [tip:x86/boot] x86/mm: Enable KASLR for physical mapping memory regions
Date: Mon, 15 Aug 2016 07:26:57 +0800 [thread overview]
Message-ID: <20160814232657.GA10704@x1.redhat.com> (raw)
In-Reply-To: <CAMzpN2h-CV2e1F_8u5GYkwaFkzoERfi9a83DEO7OeKEJB0RYTg@mail.gmail.com>
On 08/14/16 at 12:25am, Brian Gerst wrote:
> On Fri, Jul 8, 2016 at 4:35 PM, tip-bot for Thomas Garnier
> <tipbot@zytor.com> wrote:
> > Commit-ID: 021182e52fe01c1f7b126f97fd6ba048dc4234fd
> > Gitweb: http://git.kernel.org/tip/021182e52fe01c1f7b126f97fd6ba048dc4234fd
> > Author: Thomas Garnier <thgarnie@google.com>
> > AuthorDate: Tue, 21 Jun 2016 17:47:03 -0700
> > Committer: Ingo Molnar <mingo@kernel.org>
> > CommitDate: Fri, 8 Jul 2016 17:35:15 +0200
> >
> > x86/mm: Enable KASLR for physical mapping memory regions
> >
> > Add the physical mapping in the list of randomized memory regions.
> >
> > The physical memory mapping holds most allocations from boot and heap
> > allocators. Knowing the base address and physical memory size, an attacker
> > can deduce the PDE virtual address for the vDSO memory page. This attack
> > was demonstrated at CanSecWest 2016, in the following presentation:
> >
> > "Getting Physical: Extreme Abuse of Intel Based Paged Systems":
> > https://github.com/n3k/CansecWest2016_Getting_Physical_Extreme_Abuse_of_Intel_Based_Paging_Systems/blob/master/Presentation/CanSec2016_Presentation.pdf
> >
> > (See second part of the presentation).
> >
> > The exploits used against Linux worked successfully against 4.6+ but
> > fail with KASLR memory enabled:
> >
> > https://github.com/n3k/CansecWest2016_Getting_Physical_Extreme_Abuse_of_Intel_Based_Paging_Systems/tree/master/Demos/Linux/exploits
> >
> > Similar research was done at Google leading to this patch proposal.
> >
> > Variants exists to overwrite /proc or /sys objects ACLs leading to
> > elevation of privileges. These variants were tested against 4.6+.
> >
> > The page offset used by the compressed kernel retains the static value
> > since it is not yet randomized during this boot stage.
>
> This patch is causing my system to fail to boot. The last messages
> that are printed before it hangs are:
>
> [ 0.195652] smpboot: CPU0: AMD Phenom(tm) II X6 1055T Processor
> (family: 0x10, model: 0xa, stepping: 0x0)
> [ 0.195656] Performance Events: AMD PMU driver.
> [ 0.195659] ... version: 0
> [ 0.195660] ... bit width: 48
> [ 0.195660] ... generic registers: 4
> [ 0.195661] ... value mask: 0000ffffffffffff
> [ 0.195662] ... max period: 00007fffffffffff
> [ 0.195663] ... fixed-purpose events: 0
> [ 0.195664] ... event mask: 000000000000000f
> [ 0.196185] NMI watchdog: enabled on all CPUs, permanently consumes
> one hw-PMU counter.
> [ 0.196291] x86: Booting SMP configuration:
> [ 0.196292] .... node #0, CPUs: #1
>
> I'm taking a guess here, but it may be that this is interfering with
> the APIC accesses.
Seems it hang when startup 2nd cpu. It may give more information if
add below line to the beginning of arch/x86/kernel/smpboot.c and
rebuild bzImage.
#define DEBUG
>
> --
> Brian Gerst
next prev parent reply other threads:[~2016-08-14 23:27 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-22 0:46 [PATCH v7 0/9] x86/mm: memory area address KASLR Kees Cook
2016-06-22 0:46 ` [PATCH v7 1/9] x86/mm: Refactor KASLR entropy functions Kees Cook
2016-07-08 20:33 ` [tip:x86/boot] " tip-bot for Thomas Garnier
2016-06-22 0:46 ` [PATCH v7 2/9] x86/mm: Update physical mapping variable names (x86_64) Kees Cook
2016-07-08 20:34 ` [tip:x86/boot] x86/mm: Update physical mapping variable names tip-bot for Thomas Garnier
2016-06-22 0:47 ` [PATCH v7 3/9] x86/mm: PUD VA support for physical mapping (x86_64) Kees Cook
2016-07-08 20:34 ` [tip:x86/boot] x86/mm: Add PUD VA support for physical mapping tip-bot for Thomas Garnier
2016-06-22 0:47 ` [PATCH v7 4/9] x86/mm: Separate variable for trampoline PGD (x86_64) Kees Cook
2016-07-08 20:35 ` [tip:x86/boot] x86/mm: Separate variable for trampoline PGD tip-bot for Thomas Garnier
2016-06-22 0:47 ` [PATCH v7 5/9] x86/mm: Implement ASLR for kernel memory regions (x86_64) Kees Cook
2016-07-08 20:35 ` [tip:x86/boot] x86/mm: Implement ASLR for kernel memory regions tip-bot for Thomas Garnier
2016-06-22 0:47 ` [PATCH v7 6/9] x86/mm: Enable KASLR for physical mapping memory region (x86_64) Kees Cook
2016-07-08 20:35 ` [tip:x86/boot] x86/mm: Enable KASLR for physical mapping memory regions tip-bot for Thomas Garnier
2016-08-14 4:25 ` Brian Gerst
2016-08-14 23:26 ` Baoquan He [this message]
2016-08-16 11:31 ` Brian Gerst
2016-08-16 13:42 ` Borislav Petkov
2016-08-16 13:49 ` Borislav Petkov
2016-08-16 15:54 ` Borislav Petkov
2016-08-16 17:50 ` Borislav Petkov
2016-08-16 19:49 ` Kees Cook
2016-08-16 21:01 ` Borislav Petkov
2016-08-17 0:31 ` Brian Gerst
2016-08-17 9:11 ` Borislav Petkov
2016-08-17 10:19 ` Ingo Molnar
2016-08-17 11:33 ` Borislav Petkov
2016-08-18 10:49 ` [tip:x86/urgent] x86/microcode/AMD: Fix initrd loading with CONFIG_RANDOMIZE_MEMORY=y tip-bot for Borislav Petkov
2016-06-22 0:47 ` [PATCH v7 7/9] x86/mm: Enable KASLR for vmalloc memory region (x86_64) Kees Cook
2016-07-08 20:36 ` [tip:x86/boot] x86/mm: Enable KASLR for vmalloc memory regions tip-bot for Thomas Garnier
2016-06-22 0:47 ` [PATCH v7 8/9] x86/mm: Enable KASLR for vmemmap memory region (x86_64) Kees Cook
2016-06-22 0:47 ` [PATCH v7 9/9] x86/mm: Memory hotplug support for KASLR memory randomization (x86_64) Kees Cook
2016-07-08 20:36 ` [tip:x86/boot] x86/mm: Add memory hotplug support for KASLR memory randomization tip-bot for Thomas Garnier
2016-06-22 12:47 ` [kernel-hardening] [PATCH v7 0/9] x86/mm: memory area address KASLR Jason Cooper
2016-06-22 15:59 ` Thomas Garnier
2016-06-22 17:05 ` Kees Cook
2016-06-23 19:33 ` Jason Cooper
2016-06-23 19:45 ` Sandy Harris
2016-06-23 19:59 ` Kees Cook
2016-06-23 20:19 ` Jason Cooper
2016-06-23 20:16 ` Jason Cooper
2016-06-23 19:58 ` Kees Cook
2016-06-23 20:05 ` Ard Biesheuvel
2016-06-24 1:11 ` Jason Cooper
2016-06-24 10:54 ` Ard Biesheuvel
2016-06-24 16:02 ` devicetree random-seed properties, was: "Re: [PATCH v7 0/9] x86/mm: memory area address KASLR" Jason Cooper
2016-06-24 19:04 ` Kees Cook
2016-06-24 20:40 ` Andy Lutomirski
2016-06-30 21:48 ` Jason Cooper
2016-06-30 21:48 ` Jason Cooper
2016-07-07 22:24 ` [PATCH v7 0/9] x86/mm: memory area address KASLR Kees Cook
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