lkml.org 
[lkml]   [2011]   [May]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [GIT pull] x86 vdso updates
Ingo Molnar writes:
>
> * Andrew Lutomirski <luto@mit.edu> wrote:
>
> > On Fri, May 27, 2011 at 7:36 AM, Andrew Lutomirski <luto@mit.edu> wrote:
> > > 3. Add int 0xcc and use it from vgettimeofday.  It will SIGSEGV if
> > > called from a user address (so it has no risk of ever becoming ABI)
> > > and it will do gettimeofday if called from the right address.  (I like
...
> > Make it a real syscall but with extra constraints. It would have the
> > same calling convention as the syscall instruction, but it would turn
> > into SIGKILL if the calling address isn't in the VSYSCALL page

This will make things difficult for user-space dynamic binary instrumentation
applications, since these normally execute generated code at different
addresses than the original code.

Is there a safe fallback for this particular vsyscall?

/Mikael
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2011-05-29 16:43    [W:0.089 / U:0.236 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site