lkml.org 
[lkml]   [2015]   [Mar]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] capabilities: Ambient capability set V2
On Thu, 5 Mar 2015, Serge E. Hallyn wrote:

> > >
> > > So I'd say drop this change ^
> >
> > Then the ambient caps get ignored for a executables that have capabilities
> > seton the file?
>
> Yes. Those are assumed to already know what they're doing.

Do they? What if there is a LD_PRELOAD library that redirects socket calls
and that needs raw device access (there are actually a number of software
packages like that to reduce the latency of network I/O. See for example
Solarflare's software products and the current rsocket libary in OFED.
There are cap issues if the rsocket library should be made useful for
Ethernet instead of infiniband).

> Why? Do you foresee cases where a file that has fP set needs capabilities
> that aren't in its fP?

Yes due to the library issues.

> It seems more likely that they'll risk misbehaving due to an unexpected set
> of caps.

The userspace driver code in the library wont work since it does not have
the caps to access the raw device registers.


\
 
 \ /
  Last update: 2015-03-05 20:01    [W:3.433 / U:0.856 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site