From: Ingo Molnar <mingo@kernel.org>
To: Dave Hansen <dave@sr71.net>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Andy Lutomirski <luto@kernel.org>, Borislav Petkov <bp@alien8.de>,
Kees Cook <keescook@google.com>
Subject: Re: [PATCH 26/26] x86, pkeys: Documentation
Date: Thu, 1 Oct 2015 13:17:18 +0200 [thread overview]
Message-ID: <20151001111718.GA25333@gmail.com> (raw)
In-Reply-To: <56044A88.7030203@sr71.net>
* Dave Hansen <dave@sr71.net> wrote:
> > If yes then this could be a significant security feature / usecase for pkeys:
> > executable sections of shared libraries and binaries could be mapped with pkey
> > access disabled. If I read the Intel documentation correctly then that should
> > be possible.
>
> Agreed. I've even heard from some researchers who are interested in this:
>
> https://www.infsec.cs.uni-saarland.de/wp-content/uploads/sites/2/2014/10/nuernberger2014ccs_disclosure.pdf
So could we try to add an (opt-in) kernel option that enables this transparently
and automatically for all PROT_EXEC && !PROT_WRITE mappings, without any
user-space changes and syscalls necessary?
Beyond the security improvement, this would enable this hardware feature on most
x86 Linux distros automatically, on supported hardware, which is good for testing.
Assuming it boots up fine on a typical distro, i.e. assuming that there are no
surprises where PROT_READ && PROT_EXEC sections are accessed as data.
Thanks,
Ingo
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next prev parent reply other threads:[~2015-10-01 11:17 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-16 17:49 [PATCH 00/26] [RFCv2] x86: Memory Protection Keys Dave Hansen
2015-09-16 17:49 ` [PATCH 02/26] x86, pkeys: Add Kconfig option Dave Hansen
2015-09-16 17:49 ` [PATCH 04/26] x86, pku: define new CR4 bit Dave Hansen
2015-09-16 17:49 ` [PATCH 01/26] x86, fpu: add placeholder for Processor Trace XSAVE state Dave Hansen
2015-09-16 17:49 ` [PATCH 03/26] x86, pkeys: cpuid bit definition Dave Hansen
2015-09-16 17:49 ` [PATCH 06/26] x86, pkeys: PTE bits for storing protection key Dave Hansen
2015-09-16 17:49 ` [PATCH 05/26] x86, pkey: add PKRU xsave fields and data structure(s) Dave Hansen
2015-09-22 19:53 ` Thomas Gleixner
2015-09-22 19:58 ` Dave Hansen
2015-09-16 17:49 ` [PATCH 07/26] x86, pkeys: new page fault error code bit: PF_PK Dave Hansen
2015-09-16 17:49 ` [PATCH 11/26] x86, pkeys: add functions for set/fetch PKRU Dave Hansen
2015-09-22 20:05 ` Thomas Gleixner
2015-09-22 20:22 ` Dave Hansen
2015-09-16 17:49 ` [PATCH 10/26] x86, pkeys: notify userspace about protection key faults Dave Hansen
2015-09-22 20:03 ` Thomas Gleixner
2015-09-22 20:21 ` Dave Hansen
2015-09-22 20:27 ` Thomas Gleixner
2015-09-22 20:29 ` Dave Hansen
2015-09-23 8:05 ` Ingo Molnar
2015-09-24 9:23 ` Ingo Molnar
2015-09-24 9:30 ` Ingo Molnar
2015-09-24 17:41 ` Dave Hansen
2015-09-25 7:11 ` Ingo Molnar
2015-09-25 23:18 ` Dave Hansen
2015-09-26 6:20 ` Ingo Molnar
2015-09-27 22:39 ` Dave Hansen
2015-09-28 5:59 ` Ingo Molnar
2015-09-24 17:15 ` Dave Hansen
2015-09-28 19:25 ` Christian Borntraeger
2015-09-28 19:32 ` Dave Hansen
2015-09-16 17:49 ` [PATCH 08/26] x86, pkeys: store protection in high VMA flags Dave Hansen
2015-09-16 17:49 ` [PATCH 09/26] x86, pkeys: arch-specific protection bits Dave Hansen
2015-09-16 17:49 ` [PATCH 14/26] x86, pkeys: check VMAs and PTEs for protection keys Dave Hansen
2015-09-16 17:49 ` [PATCH 12/26] mm: factor out VMA fault permission checking Dave Hansen
2015-09-16 17:49 ` [PATCH 13/26] mm: simplify get_user_pages() PTE bit handling Dave Hansen
2015-09-16 17:49 ` [PATCH 16/26] x86, pkeys: dump PKRU with other kernel registers Dave Hansen
2015-09-16 17:49 ` [PATCH 17/26] x86, pkeys: dump PTE pkey in /proc/pid/smaps Dave Hansen
2015-09-16 17:49 ` [PATCH 15/26] x86, pkeys: optimize fault handling in access_error() Dave Hansen
2015-09-16 17:49 ` [PATCH 20/26] [NEWSYSCALL] mm: implement new mprotect_pkey() system call Dave Hansen
2015-09-16 17:49 ` [PATCH 19/26] [NEWSYSCALL] mm, multi-arch: pass a protection key in to calc_vm_flag_bits() Dave Hansen
2015-09-16 17:49 ` [PATCH 18/26] x86, pkeys: add Kconfig prompt to existing config option Dave Hansen
2015-09-16 17:49 ` [PATCH 21/26] [NEWSYSCALL] x86: wire up mprotect_key() system call Dave Hansen
2015-09-16 17:49 ` [PATCH 22/26] [HIJACKPROT] mm: Pass the 4-bit protection key in via PROT_ bits to syscalls Dave Hansen
2015-09-16 17:49 ` [PATCH 23/26] [HIJACKPROT] x86, pkeys: add x86 version of arch_validate_prot() Dave Hansen
2015-09-16 17:49 ` [PATCH 25/26] x86, pkeys: actually enable Memory Protection Keys in CPU Dave Hansen
2015-09-16 17:49 ` [PATCH 24/26] [HIJACKPROT] x86, pkeys: mask off pkeys bits in mprotect() Dave Hansen
2015-09-16 17:49 ` [PATCH 26/26] x86, pkeys: Documentation Dave Hansen
2015-09-20 8:55 ` Ingo Molnar
2015-09-21 4:34 ` Dave Hansen
2015-09-24 9:49 ` Ingo Molnar
2015-09-24 19:10 ` Dave Hansen
2015-09-24 19:17 ` Andy Lutomirski
2015-09-25 7:16 ` Ingo Molnar
2015-09-25 6:15 ` Ingo Molnar
2015-10-01 11:17 ` Ingo Molnar [this message]
2015-10-01 20:39 ` Kees Cook
2015-10-01 20:45 ` Andy Lutomirski
2015-10-02 6:23 ` Ingo Molnar
2015-10-02 17:50 ` Dave Hansen
2015-10-03 7:27 ` Ingo Molnar
2015-10-06 23:28 ` Dave Hansen
2015-10-07 7:11 ` Ingo Molnar
2015-10-16 15:12 ` Dave Hansen
2015-10-21 18:55 ` Andy Lutomirski
2015-10-21 19:11 ` Dave Hansen
2015-10-21 23:22 ` Andy Lutomirski
2015-10-01 20:58 ` Dave Hansen
2015-10-01 22:33 ` Dave Hansen
2015-10-01 22:35 ` Kees Cook
2015-10-01 22:39 ` Dave Hansen
2015-10-01 22:48 ` Linus Torvalds
2015-10-01 22:56 ` Dave Hansen
2015-10-02 1:38 ` Linus Torvalds
2015-10-02 18:08 ` Dave Hansen
2015-10-02 7:09 ` Ingo Molnar
2015-10-03 6:59 ` Ingo Molnar
2015-10-02 11:49 ` Paolo Bonzini
2015-10-02 11:58 ` Linus Torvalds
2015-10-02 12:14 ` Paolo Bonzini
2015-10-03 6:46 ` Ingo Molnar
2015-10-01 22:57 ` Andy Lutomirski
2015-10-02 6:09 ` Ingo Molnar
2015-10-03 8:17 ` Ingo Molnar
2015-10-07 20:24 ` Dave Hansen
2015-10-07 20:39 ` Andy Lutomirski
2015-10-07 20:47 ` Dave Hansen
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