Re: [RFC][PATCH] objtool: STAC/CLAC validation

[mailing lists removed because this is a potentially large source of exploits]

On Fri, Feb 22, 2019 at 2:26 PM Peter Zijlstra [off-list ref] wrote:

On Fri, Feb 22, 2019 at 07:10:34PM +0100, Thomas Gleixner wrote:

quoted

But correct :)

quoted

I agree, that a function which is doing the actual copy should be callable,
but random other functions? NO!

So find the below patch -- which spotted fail in ptrace.c

Um, wait a moment.  You didn't find an oddity in ptrace.c.  You found
a giant freaking error in uaccess.h.

Am I missing something?  How are there not zillions of instances of
this that your patch ought to catch?  Or is genregs_get() really the
only example?