[lkml]   [2012]   [May]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] scsi: Silence unnecessary warnings about ioctl to partition
> Sure, but then disallowing the ioctls for processes with CAP_SYS_RAWIO
> will not cause regressions and _can_ happen. The transition period only

The user has CAP_SYS_RAWIO, they can already do it by poking the
registers on the chip directly. It is a nonsense to attempt to block or
warn about this.

> up and implement a very restrictive filter for SCSI commands sent to
> partition.

The process has CAP_SYS_RAWIO it can already bypass any check you try and
put in place.

> The right patch is one that prepares for these step,

Doesn't look very right to me.

> for example. It
> leaves the warning only for SG_IO, and silently blocks the rest (more
> rationale in the commit message there).

Even the printk in that patch is wrong. We have capabilities. Being a
"root" user is a meaningless distinction here so your ratelimited printk
isn't just bogus - its wrong. It may have got into RHEL somehow but the
kernel QA process is a bit higher standard than this proposed patch.

A process with CAP_SYS_RAWIO has total power. It's assumed to know what
it is doing. Trying to block it doing stuff like that simply makes
authors do them via different more crass methods.


 \ /
  Last update: 2012-05-02 13:41    [W:0.122 / U:1.172 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site