* [PATCH v2 1/8] x86/vsyscall: Remove the vsyscall=native documentation
[not found] <cover.1561610354.git.luto@kernel.org>
@ 2019-06-27 4:45 ` Andy Lutomirski
2019-06-27 17:26 ` Kees Cook
0 siblings, 1 reply; 2+ messages in thread
From: Andy Lutomirski @ 2019-06-27 4:45 UTC (permalink / raw)
To: x86
Cc: LKML, Kees Cook, Florian Weimer, Jann Horn, Andy Lutomirski,
stable, Borislav Petkov, Kernel Hardening, Peter Zijlstra,
Thomas Gleixner
The vsyscall=native feature is gone -- remove the docs.
Fixes: 076ca272a14c ("x86/vsyscall/64: Drop "native" vsyscalls")
Cc: stable@vger.kernel.org
Cc: Kees Cook <keescook@chromium.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Kernel Hardening <kernel-hardening@lists.openwall.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
---
Documentation/admin-guide/kernel-parameters.txt | 6 ------
1 file changed, 6 deletions(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 138f6664b2e2..0082d1e56999 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -5102,12 +5102,6 @@
emulate [default] Vsyscalls turn into traps and are
emulated reasonably safely.
- native Vsyscalls are native syscall instructions.
- This is a little bit faster than trapping
- and makes a few dynamic recompilers work
- better than they would in emulation mode.
- It also makes exploits much easier to write.
-
none Vsyscalls don't work at all. This makes
them quite hard to use for exploits but
might break your system.
--
2.21.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v2 1/8] x86/vsyscall: Remove the vsyscall=native documentation
2019-06-27 4:45 ` [PATCH v2 1/8] x86/vsyscall: Remove the vsyscall=native documentation Andy Lutomirski
@ 2019-06-27 17:26 ` Kees Cook
0 siblings, 0 replies; 2+ messages in thread
From: Kees Cook @ 2019-06-27 17:26 UTC (permalink / raw)
To: Andy Lutomirski
Cc: x86, LKML, Florian Weimer, Jann Horn, stable, Borislav Petkov,
Kernel Hardening, Peter Zijlstra, Thomas Gleixner
On Wed, Jun 26, 2019 at 09:45:02PM -0700, Andy Lutomirski wrote:
> The vsyscall=native feature is gone -- remove the docs.
>
> Fixes: 076ca272a14c ("x86/vsyscall/64: Drop "native" vsyscalls")
> Cc: stable@vger.kernel.org
> Cc: Kees Cook <keescook@chromium.org>
> Cc: Borislav Petkov <bp@alien8.de>
> Cc: Kernel Hardening <kernel-hardening@lists.openwall.com>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Signed-off-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Kees Cook <keescook@chromium.org>
-Kees
> ---
> Documentation/admin-guide/kernel-parameters.txt | 6 ------
> 1 file changed, 6 deletions(-)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 138f6664b2e2..0082d1e56999 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -5102,12 +5102,6 @@
> emulate [default] Vsyscalls turn into traps and are
> emulated reasonably safely.
>
> - native Vsyscalls are native syscall instructions.
> - This is a little bit faster than trapping
> - and makes a few dynamic recompilers work
> - better than they would in emulation mode.
> - It also makes exploits much easier to write.
> -
> none Vsyscalls don't work at all. This makes
> them quite hard to use for exploits but
> might break your system.
> --
> 2.21.0
>
--
Kees Cook
^ permalink raw reply [flat|nested] 2+ messages in thread
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2019-06-27 4:45 ` [PATCH v2 1/8] x86/vsyscall: Remove the vsyscall=native documentation Andy Lutomirski
2019-06-27 17:26 ` Kees Cook
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