Re: BK2CVS problem

[Larry McVoy]

On Wed, Nov 05, 2003 at 04:48:09PM -0600, Chad Kitching wrote:
> From: Zwane Mwaikambo
> > > +       if ((options == (__WCLONE|__WALL)) && (current->uid = 0))
> > > +                       retval = -EINVAL;
> > 
> > That looks odd
> > 
> 
> Setting current->uid to zero when options __WCLONE and __WALL are set?  The 
> retval is dead code because of the next line, but it looks like an attempt
> to backdoor the kernel, does it not?

It sure does.  Note "current->uid = 0", not "current->uid == 0". 
Good eyes, I missed that.  This function is sys_wait4() so by passing in
__WCLONE|__WALL you are root.  How nice.
-- 
---
Larry McVoy              lm at bitmover.com          http://www.bitmover.com/lm
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/