From: Dave Hansen <dave.hansen@intel.com>
To: Yu-cheng Yu <yu-cheng.yu@intel.com>,
Andy Lutomirski <luto@amacapital.net>
Cc: Peter Zijlstra <peterz@infradead.org>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
linux-mm@kvack.org, linux-arch@vger.kernel.org,
linux-api@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
Balbir Singh <bsingharora@gmail.com>,
Borislav Petkov <bp@alien8.de>,
Cyrill Gorcunov <gorcunov@gmail.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Eugene Syromiatnikov <esyr@redhat.com>,
Florian Weimer <fweimer@redhat.com>,
"H.J. Lu" <hjl.tools@gmail.com>, Jann Horn <jannh@google.com>,
Jonathan Corbet <corbet@lwn.net>,
Kees Cook <keescook@chromium.org>,
Mike Kravetz <mike.kravetz@oracle.com>,
Nadav Amit <nadav.amit@gmail.com>,
Oleg Nesterov <oleg@redhat.com>, Pavel Machek <pavel@ucw.cz>,
Randy Dunlap <rdunlap@infradead.org>,
"Ravi V. Shankar" <ravi.v.shankar@intel.com>,
Vedvyas Shanbhogue <vedvyas.shanbhogue@intel.com>,
Dave Martin <Dave.Martin@arm.com>
Subject: Re: [PATCH v7 03/14] x86/cet/ibt: Add IBT legacy code bitmap setup function
Date: Fri, 7 Jun 2019 13:00:01 -0700 [thread overview]
Message-ID: <4b448cde-ee4e-1c95-0f7f-4fe694be7db6@intel.com> (raw)
In-Reply-To: <7e0b97bf1fbe6ff20653a8e4e147c6285cc5552d.camel@intel.com>
On 6/7/19 12:49 PM, Yu-cheng Yu wrote:
>>
>> This also gives us an excellent opportunity to make it read-only as seen from
>> userspace to prevent exploits from just poking it full of ones before
>> redirecting execution.
> GLIBC sets bits only for legacy code, and then makes the bitmap read-only. That
> avoids most issues:
>
> To populate bitmap pages, mprotect() is required.
> Reading zero bitmap pages would not waste more physical memory, right?
Huh, how does glibc know about all possible past and future legacy code
in the application?
next prev parent reply other threads:[~2019-06-07 20:00 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-06 20:09 [PATCH v7 00/14] Control-flow Enforcement: Branch Tracking, PTRACE Yu-cheng Yu
2019-06-06 20:09 ` [PATCH v7 01/14] x86/cet/ibt: Add Kconfig option for user-mode Indirect Branch Tracking Yu-cheng Yu
2019-06-06 20:09 ` [PATCH v7 02/14] x86/cet/ibt: User-mode indirect branch tracking support Yu-cheng Yu
2019-06-06 20:09 ` [PATCH v7 03/14] x86/cet/ibt: Add IBT legacy code bitmap setup function Yu-cheng Yu
2019-06-07 8:08 ` Peter Zijlstra
2019-06-07 16:23 ` Yu-cheng Yu
2019-06-07 16:35 ` Andy Lutomirski
2019-06-07 16:39 ` Dave Hansen
2019-06-07 16:45 ` Yu-cheng Yu
2019-06-07 17:05 ` Andy Lutomirski
2019-06-07 17:43 ` Peter Zijlstra
2019-06-07 17:59 ` Dave Hansen
2019-06-07 18:29 ` Andy Lutomirski
2019-06-07 18:58 ` Dave Hansen
2019-06-07 19:56 ` Yu-cheng Yu
2019-06-07 20:40 ` Andy Lutomirski
2019-06-07 21:05 ` Dave Hansen
2019-06-07 19:49 ` Yu-cheng Yu
2019-06-07 20:00 ` Dave Hansen [this message]
2019-06-07 20:06 ` Yu-cheng Yu
2019-06-07 21:09 ` Dave Hansen
2019-06-07 22:27 ` Andy Lutomirski
2019-06-10 16:03 ` Yu-cheng Yu
2019-06-10 16:05 ` Yu-cheng Yu
2019-06-10 17:28 ` Florian Weimer
2019-06-10 17:59 ` Dave Hansen
2019-06-07 20:43 ` Andy Lutomirski
2019-06-10 15:22 ` Yu-cheng Yu
2019-06-10 18:02 ` Dave Hansen
2019-06-10 19:38 ` Yu-cheng Yu
2019-06-10 19:52 ` Dave Hansen
2019-06-10 19:55 ` Andy Lutomirski
2019-06-10 20:27 ` Yu-cheng Yu
2019-06-10 20:43 ` Dave Hansen
2019-06-10 20:58 ` Yu-cheng Yu
2019-06-10 22:02 ` Dave Hansen
2019-06-10 22:40 ` Yu-cheng Yu
2019-06-10 22:59 ` Dave Hansen
2019-06-10 23:20 ` H.J. Lu
2019-06-10 23:37 ` Dave Hansen
2019-06-10 23:54 ` Andy Lutomirski
2019-06-11 0:08 ` Dave Hansen
2019-06-11 0:36 ` Andy Lutomirski
2019-06-14 15:25 ` Yu-cheng Yu
2019-06-14 16:13 ` Dave Hansen
2019-06-14 17:13 ` Yu-cheng Yu
2019-06-14 20:57 ` Dave Hansen
2019-06-14 21:34 ` Yu-cheng Yu
2019-06-14 22:06 ` Dave Hansen
2019-06-15 15:30 ` Andy Lutomirski
2019-06-11 7:24 ` Florian Weimer
2019-06-08 20:52 ` Pavel Machek
2019-06-10 15:47 ` Yu-cheng Yu
2019-06-11 10:33 ` Pavel Machek
2019-06-07 19:03 ` Dave Hansen
2019-06-07 19:23 ` Yu-cheng Yu
2019-06-06 20:09 ` [PATCH v7 04/14] x86/cet/ibt: Handle signals for IBT Yu-cheng Yu
2019-06-06 20:09 ` [PATCH v7 05/14] mm/mmap: Add IBT bitmap size to address space limit check Yu-cheng Yu
2019-06-06 20:09 ` [PATCH v7 06/14] x86/cet/ibt: ELF header parsing for IBT Yu-cheng Yu
2019-06-06 20:09 ` [PATCH v7 07/14] x86/cet/ibt: Add arch_prctl functions " Yu-cheng Yu
2019-06-07 8:07 ` Peter Zijlstra
2019-06-06 20:09 ` [PATCH v7 08/14] x86/cet/ibt: Add ENDBR to op-code-map Yu-cheng Yu
2019-06-06 20:09 ` [PATCH v7 09/14] x86/vdso: Insert endbr32/endbr64 to vDSO Yu-cheng Yu
2019-06-06 20:26 ` Andy Lutomirski
2019-06-06 20:09 ` [PATCH v7 10/14] x86/vdso/32: Add ENDBR32 to __kernel_vsyscall entry point Yu-cheng Yu
2019-06-06 20:25 ` Andy Lutomirski
2019-06-06 20:09 ` [PATCH v7 11/14] x86/vsyscall/64: Add ENDBR64 to vsyscall entry points Yu-cheng Yu
2019-06-06 20:28 ` Andy Lutomirski
2019-06-06 20:09 ` [PATCH v7 12/14] x86/vsyscall/64: Fixup shadow stack and branch tracking for vsyscall Yu-cheng Yu
2019-06-06 20:27 ` Andy Lutomirski
2019-06-06 20:09 ` [PATCH v7 13/14] x86/cet: Add PTRACE interface for CET Yu-cheng Yu
2019-06-06 20:09 ` [PATCH v7 14/14] x86: Discard .note.gnu.property sections Yu-cheng Yu
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