[lkml]   [2007]   [Oct]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: "Fix ATAPI transfer lengths" causes CD writing regression
Jens Axboe wrote:
> Right, that's of course problematic... There has to be a way to recover
> that situation though, or you can't export any user command issue
> facility.

You cannot hope to handle all possible effects arising from an app
providing an invalid sg header / cdb.

Once you start talking "recovery" you are already screwed: we are
talking about low-level hardware commands that are passed straight to
the hardware. It is trivial to lock up hardware, brick hardware, and
corrupt data at that level.

If this is NOT a privileged app, we must update the command validation
to ensure that invalid commands are not transported to the hardware.

If this is a privileged app, our work is done. Fix the app. We gave
root rope, and he took it.

I even venture to say that "accept anything, clean up afterwards" is
/impossible/ to implement, in addition to being dangerous.


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2007-10-31 17:09    [W:0.056 / U:21.416 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site