linux-kernel - RE: [char-misc v2] mei: trace: treat reg parameter as string

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Message-ID: <CY5PR11MB6366A429654AFBFAA5D41825ED85A@CY5PR11MB6366.namprd11.prod.outlook.com>
Date: Thu, 8 Jan 2026 07:42:22 +0000
From: "Usyskin, Alexander" <alexander.usyskin@...el.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC: "Abliyev, Reuven" <reuven.abliyev@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [char-misc v2] mei: trace: treat reg parameter as string

> Subject: Re: [char-misc v2] mei: trace: treat reg parameter as string
> 
> On Thu, Jan 08, 2026 at 08:57:02AM +0200, Alexander Usyskin wrote:
> > Use the string wrapper to check sanity of the reg parameters,
> > store it value independently and prevent internal kernel data leaks.
> > Trace subsystem refuses to emit event with plain char*,
> > without the wrapper.
> >
> > Cc: stable@...r.kernel.org
> 
> Does this really fix a bug?  If not, there's no need for cc: stable or:
> 
> > Fixes: a0a927d06d79 ("mei: me: add io register tracing")
> 
> That line as well.
> 
> thanks,
> 
> greg k-h

Without this patch the events are not emitted at all, they are dropped
by trace security checker.

- - 
Thanks,
Sasha