lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Sat, 25 Nov 2017 13:41:54 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Ingo Molnar <mingo@...nel.org>
cc:     linux-kernel@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...capital.net>,
        "H . Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 22/43] x86/mm/kaiser: Prepare assembly for entry/exit
 CR3 switching

On Sat, 25 Nov 2017, Thomas Gleixner wrote:

> On Fri, 24 Nov 2017, Ingo Molnar wrote:
> > @@ -1288,6 +1308,8 @@ ENTRY(error_entry)
> >  	 * from user mode due to an IRET fault.
> >  	 */
> >  	SWAPGS
> > +	/* We have user CR3.  Change to kernel CR3. */
> > +	SWITCH_TO_KERNEL_CR3 scratch_reg=%rax
> >  
> >  .Lerror_entry_from_usermode_after_swapgs:
> >  	/* Put us onto the real thread stack. */
> > @@ -1333,6 +1355,7 @@ ENTRY(error_entry)
> >  	 * gsbase and proceed.  We'll fix up the exception and land in
> >  	 * .Lgs_change's error handler with kernel gsbase.
> >  	 */
> > +	SWITCH_TO_KERNEL_CR3 scratch_reg=%rax
> >  	SWAPGS
> 
> This is wrong. SWAPGS needs to come first.

With this fixed:

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>

Powered by blists - more mailing lists