From: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
To: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@kernel.org>, Ingo Molnar <mingo@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Peter Zijlstra <peterz@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
Brian Gerst <brgerst@gmail.com>,
Chris Metcalf <cmetcalf@mellanox.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Huang Rui <ray.huang@amd.com>, Jiri Slaby <jslaby@suse.cz>,
Jonathan Corbet <corbet@lwn.net>,
"Michael S. Tsirkin" <mst@redhat.com>,
Paul Gortmaker <paul.gortmaker@windriver.com>,
Vlastimil Babka <vbabka@suse.cz>, Chen Yucong <slaoub@gmail.com>,
"Ravi V. Shankar" <ravi.v.shankar@intel.com>,
Shuah Khan <shuah@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
X86 ML <x86@kernel.org>, "Neri, Ricardo" <ricardo.neri@intel.com>,
Dave Hansen <dave.hansen@intel.com>,
Denys Vlasenko <dvlasenk@redhat.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-arch <linux-arch@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: [PATCH v9 02/29] x86/boot: Relocate definition of the initial state of CR0
Date: Fri, 27 Oct 2017 12:02:19 -0700 [thread overview]
Message-ID: <20171027190219.GA7057@voyager> (raw)
In-Reply-To: <20171026125513.GB12068@nazgul.tnic>
On Thu, Oct 26, 2017 at 02:55:13PM +0200, Borislav Petkov wrote:
> On Thu, Oct 26, 2017 at 02:02:02AM -0700, Andy Lutomirski wrote:
> > I'm assuming that UMIP_REPORTED_CR0 will never change. If CR0 gets a
> > new field that we set some day, then I assume that CR0_STATE would add
> > that bit but UMIP_REPORTED_CR0 would not.
>
> Yeah, let's do that when it is actually needed.
Thanks Andy! I reasoned that for UMIP could report CR0_STATE a value that
is already revealed in the source code. Thus, if CR0 ever changes at run
time, an attacker could only see what is set programmatically.
BR,
Ricardo
next prev parent reply other threads:[~2017-10-27 19:03 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-04 3:54 [PATCH v9 00/29] x86: Enable User-Mode Instruction Prevention Ricardo Neri
2017-10-04 3:54 ` [PATCH v9 01/29] x86/mm: Relocate page fault error codes to traps.h Ricardo Neri
2017-10-04 3:54 ` [PATCH v9 02/29] x86/boot: Relocate definition of the initial state of CR0 Ricardo Neri
2017-10-26 7:51 ` Andy Lutomirski
2017-10-26 9:00 ` Borislav Petkov
2017-10-26 9:02 ` Andy Lutomirski
2017-10-26 12:55 ` Borislav Petkov
2017-10-27 19:02 ` Ricardo Neri [this message]
2017-10-04 3:54 ` [PATCH v9 03/29] ptrace,x86: Make user_64bit_mode() available to 32-bit builds Ricardo Neri
2017-10-04 3:54 ` [PATCH v9 04/29] uprobes/x86: Use existing definitions for segment override prefixes Ricardo Neri
2017-10-04 3:54 ` [PATCH v9 05/29] x86/mpx: Simplify handling of errors when computing linear addresses Ricardo Neri
2017-10-04 3:54 ` [PATCH v9 06/29] x86/mpx: Use signed variables to compute effective addresses Ricardo Neri
2017-10-05 9:41 ` Borislav Petkov
2017-10-05 17:38 ` Neri, Ricardo
2017-10-04 3:54 ` [PATCH v9 07/29] x86/mpx: Do not use SIB.index if its value is 100b and ModRM.mod is not 11b Ricardo Neri
2017-10-04 3:54 ` [PATCH v9 08/29] x86/mpx: Do not use SIB.base if its value is 101b and ModRM.mod = 0 Ricardo Neri
2017-10-04 3:54 ` [PATCH v9 09/29] x86/mpx, x86/insn: Relocate insn util functions to a new insn-eval file Ricardo Neri
2017-10-04 3:54 ` [PATCH v9 10/29] x86/insn-eval: Do not BUG on invalid register type Ricardo Neri
2017-10-07 16:22 ` Borislav Petkov
2017-10-09 23:56 ` Ricardo Neri
2017-10-04 3:54 ` [PATCH v9 11/29] x86/insn-eval: Add a utility function to get register offsets Ricardo Neri
2017-10-04 3:54 ` [PATCH v9 12/29] x86/insn-eval: Add utility function to identify string instructions Ricardo Neri
2017-10-04 3:54 ` [PATCH v9 13/29] x86/insn-eval: Add utility functions to get segment selector Ricardo Neri
2017-10-10 22:41 ` Borislav Petkov
2017-10-12 1:12 ` Ricardo Neri
2017-10-12 9:48 ` Borislav Petkov
2017-10-13 1:08 ` Ricardo Neri
2017-10-13 11:37 ` Borislav Petkov
2017-10-13 18:43 ` Ricardo Neri
2017-10-17 9:35 ` Borislav Petkov
2017-10-17 20:31 ` Ricardo Neri
2017-10-18 20:29 ` Borislav Petkov
2017-10-19 6:30 ` Ricardo Neri
2017-10-20 7:55 ` Borislav Petkov
2017-10-20 18:05 ` Ricardo Neri
2017-10-04 3:54 ` [PATCH v9 14/29] x86/insn-eval: Add utility function to get segment descriptor Ricardo Neri
2017-10-11 14:57 ` Borislav Petkov
2017-10-12 0:45 ` Ricardo Neri
2017-10-04 3:54 ` [PATCH v9 15/29] x86/insn-eval: Add utility functions to get segment descriptor base address and limit Ricardo Neri
2017-10-11 15:15 ` Borislav Petkov
2017-10-11 19:57 ` Ricardo Neri
2017-10-11 20:16 ` Borislav Petkov
2017-10-12 1:24 ` Ricardo Neri
2017-10-12 16:02 ` Borislav Petkov
2017-10-04 3:54 ` [PATCH v9 16/29] x86/insn-eval: Add function to get default params of code segment Ricardo Neri
2017-10-12 16:31 ` Borislav Petkov
2017-10-12 18:27 ` Ricardo Neri
2017-10-04 3:54 ` [PATCH v9 17/29] x86/insn-eval: Indicate a 32-bit displacement if ModRM.mod is 0 and ModRM.rm is 101b Ricardo Neri
2017-10-20 15:44 ` Borislav Petkov
2017-10-20 18:07 ` Ricardo Neri
2017-10-04 3:54 ` [PATCH v9 18/29] x86/insn-eval: Incorporate segment base in linear address computation Ricardo Neri
2017-10-20 16:08 ` Borislav Petkov
2017-10-20 18:10 ` Ricardo Neri
2017-10-04 3:54 ` [PATCH v9 19/29] x86/insn-eval: Add support to resolve 32-bit address encodings Ricardo Neri
2017-10-20 17:12 ` Borislav Petkov
2017-10-20 18:24 ` Ricardo Neri
2017-10-20 18:38 ` Borislav Petkov
2017-10-20 19:16 ` Ricardo Neri
2017-10-20 22:04 ` Borislav Petkov
2017-10-04 3:54 ` [PATCH v9 20/29] x86/insn-eval: Add wrapper function for 32 and 64-bit addresses Ricardo Neri
2017-10-04 3:54 ` [PATCH v9 21/29] x86/insn-eval: Handle 32-bit address encodings in virtual-8086 mode Ricardo Neri
2017-10-04 3:54 ` [PATCH v9 22/29] x86/insn-eval: Add support to resolve 16-bit addressing encodings Ricardo Neri
2017-10-04 3:54 ` [PATCH v9 23/29] x86/cpufeature: Add User-Mode Instruction Prevention definitions Ricardo Neri
2017-10-04 3:54 ` [PATCH v9 24/29] x86: Add emulation code for UMIP instructions Ricardo Neri
2017-10-04 3:54 ` [PATCH v9 25/29] x86/umip: Force a page fault when unable to copy emulated result to user Ricardo Neri
2017-10-26 7:59 ` Andy Lutomirski
2017-10-27 21:46 ` Ricardo Neri
2017-10-04 3:54 ` [PATCH v9 26/29] x86: Enable User-Mode Instruction Prevention Ricardo Neri
2017-10-04 3:54 ` [PATCH v9 27/29] x86/traps: Fixup general protection faults caused by UMIP Ricardo Neri
2017-10-04 3:54 ` [PATCH v9 28/29] selftests/x86: Add tests for User-Mode Instruction Prevention Ricardo Neri
2017-10-04 3:54 ` [PATCH v9 29/29] selftests/x86: Add tests for instruction str and sldt Ricardo Neri
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