linux-kernel - Re: [PATCH 3/5] uprobes: fix overflow in vma_address/find_active

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Date:	Thu, 12 Jul 2012 11:26:55 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Joe Perches <joe@...ches.com>, Ingo Molnar <mingo@...e.hu>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anton Arapov <anton@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] uprobes: fix overflow in
 vma_address/find_active_uprobe

* Oleg Nesterov <oleg@...hat.com> [2012-07-09 12:54:45]:

> On 07/08, Joe Perches wrote:
> >
> > On Sun, 2012-07-08 at 22:30 +0200, Oleg Nesterov wrote:
> > > @@ -1450,7 +1450,7 @@ static struct uprobe *find_active_uprobe(unsigned long bp_vaddr, int *is_swbp)
> > >
> > >  			inode = vma->vm_file->f_mapping->host;
> > >  			offset = bp_vaddr - vma->vm_start;
> > > -			offset += (vma->vm_pgoff << PAGE_SHIFT);
> > > +			offset += ((loff_t)vma->vm_pgoff << PAGE_SHIFT);
> >
> > It's be nice to take remove the unnecessary parenthesis
> > and make it consistent with the vaddr use above it too.
> 
> OK, please find v2 below.
> 
> ------------------------------------------------------------------------------
> Subject: [PATCH] uprobes: fix overflow in vma_address/find_active_uprobe
> 
> vma->vm_pgoff is "unsigned long", it should be promoted to loff_t
> before the multiplication to avoid the overflow.
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>

Acked-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>

> ---
>  kernel/events/uprobes.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
> index 47c4e24..6194edb 100644
> --- a/kernel/events/uprobes.c
> +++ b/kernel/events/uprobes.c
> @@ -117,7 +117,7 @@ static loff_t vma_address(struct vm_area_struct *vma, loff_t offset)
>  	loff_t vaddr;
> 
>  	vaddr = vma->vm_start + offset;
> -	vaddr -= vma->vm_pgoff << PAGE_SHIFT;
> +	vaddr -= (loff_t)vma->vm_pgoff << PAGE_SHIFT;
> 
>  	return vaddr;
>  }
> @@ -1450,7 +1450,7 @@ static struct uprobe *find_active_uprobe(unsigned long bp_vaddr, int *is_swbp)
> 
>  			inode = vma->vm_file->f_mapping->host;
>  			offset = bp_vaddr - vma->vm_start;
> -			offset += (vma->vm_pgoff << PAGE_SHIFT);
> +			offset += (loff_t)vma->vm_pgoff << PAGE_SHIFT;
>  			uprobe = find_uprobe(inode, offset);
>  		}
> 

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