linux-kernel - Re: [PATCH] uprobes/x86: fix detection of 32-bit user mode

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Date:   Mon, 19 Aug 2019 20:43:03 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Sebastian Mayr <me@....st>
cc:     Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] uprobes/x86: fix detection of 32-bit user mode

On Mon, 19 Aug 2019, Sebastian Mayr wrote:
> > @@ -1056,7 +1056,7 @@ bool arch_uprobe_skip_sstep(struct arch_uprobe
> > *auprobe, struct pt_regs *regs)
> >  unsigned long
> >  arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr,
> > struct pt_regs *regs)
> >  {
> > -	int rasize = sizeof_long(), nleft;
> > +	int rasize = sizeof_long(regs), nleft;
> >  	unsigned long orig_ret_vaddr = 0; /* clear high bits for 32-bit 
> > apps */
> >  
> >  	if (copy_from_user(&orig_ret_vaddr, (void __user *)regs->sp,
> > rasize))
> 
> Any feedback on this patch would be greatly appreciated.

Sorry, fell through the cracks. Thanks for the reminder!