lkml.org 
[lkml]   [2016]   [Feb]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [kernel-hardening] [PATCH] arm64: vdso: Mark vDSO code as read-only
On Thu, Feb 11, 2016 at 03:19:20PM +0100, Ard Biesheuvel wrote:

>> diff --git a/arch/arm64/kernel/vdso/vdso.S b/arch/arm64/kernel/vdso/vdso.S
>> index 60c1db5..db7c0f2 100644
>> --- a/arch/arm64/kernel/vdso/vdso.S
>> +++ b/arch/arm64/kernel/vdso/vdso.S
>> @@ -24,6 +24,7 @@
>> __PAGE_ALIGNED_DATA
>
>^^ You can get rid of this now as well

Can we? The page is getting mapped to userspace, and if we didn't
page align it, we could leak kernel read-only data to every userspace
process.

David

\
 
 \ /
  Last update: 2016-02-13 01:41    [W:0.742 / U:0.172 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site