Re: [PATCH] kernel/sys.c: fix prctl_set_auxv to use sizeof instead of user-supplied len

[David Laight]

On Tue, 2 Jun 2026 19:25:56 +0200
"David Hildenbrand (Arm)" <david@xxxxxxxxxx> wrote:

> On 6/2/26 16:14, Aiden Bowling wrote:
> > The issue is that using the user-supplied 'len' risks a partial write into mm-  
> >>saved_auxv if they pass something smaller than the actual buffer size, even if  
> > the buffer is validated. We should always copy the full buffer size after
> > validation to maintain consistency and prevent accidental partial data exposure/
> > corruption.  
> 
> Which partial data exposure?
> 

The one you don't get with the patch because of the previously
unnecessary initialisation of the array :-)