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From: Jeff Layton <jlayton@kernel.org>
To: "Matthew Wilcox (Oracle)" <willy@infradead.org>,
	linux-fsdevel@vger.kernel.org
Cc: ericvh@gmail.com, lucho@ionkov.net, viro@zeniv.linux.org.uk,
	idryomov@gmail.com, mark@fasheh.com, jlbec@evilplan.org,
	joseph.qi@linux.alibaba.com,
	v9fs-developer@lists.sourceforge.net,
	linux-kernel@vger.kernel.org, ceph-devel@vger.kernel.org,
	ocfs2-devel@oss.oracle.com, linux-btrfs@vger.kernel.org,
	clm@fb.com, josef@toxicpanda.com, dsterba@suse.com,
	stable@vger.kernel.org
Subject: Re: [PATCH 3/7] ceph: Promote to unsigned long long before shifting
Date: Tue, 06 Oct 2020 07:29:00 -0400
Message-ID: <c00f08a9891c878ee9483aa9d05b4e28c2a5791a.camel@kernel.org> (raw)
In-Reply-To: <20201004180428.14494-4-willy@infradead.org>

On Sun, 2020-10-04 at 19:04 +0100, Matthew Wilcox (Oracle) wrote:
> On 32-bit systems, this shift will overflow for files larger than 4GB.
> 
> Cc: stable@vger.kernel.org
> Fixes: 61f68816211e ("ceph: check caps in filemap_fault and page_mkwrite")
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
> ---
>  fs/ceph/addr.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
> index 6ea761c84494..970e5a094035 100644
> --- a/fs/ceph/addr.c
> +++ b/fs/ceph/addr.c
> @@ -1522,7 +1522,7 @@ static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf)
>  	struct ceph_inode_info *ci = ceph_inode(inode);
>  	struct ceph_file_info *fi = vma->vm_file->private_data;
>  	struct page *pinned_page = NULL;
> -	loff_t off = vmf->pgoff << PAGE_SHIFT;
> +	loff_t off = (loff_t)vmf->pgoff << PAGE_SHIFT;
>  	int want, got, err;
>  	sigset_t oldset;
>  	vm_fault_t ret = VM_FAULT_SIGBUS;

Good catch! Would you like us to take this in via the ceph tree, or are
you planning to submit altogether upstream? Either way:

Reviewed-by: Jeff Layton <jlayton@kernel.org>


  reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-04 18:04 [PATCH 0/7] Fix a pile of 4GB file problems on 32-bit Matthew Wilcox (Oracle)
2020-10-04 18:04 ` [PATCH 1/7] 9P: Cast to loff_t before multiplying Matthew Wilcox (Oracle)
2020-10-07  5:48   ` Christoph Hellwig
2020-10-07 18:47     ` Matthew Wilcox
2020-10-26 17:14   ` Dominique Martinet
2020-10-04 18:04 ` [PATCH 2/7] buffer: Promote to unsigned long long before shifting Matthew Wilcox (Oracle)
2020-10-04 18:04 ` [PATCH 3/7] ceph: " Matthew Wilcox (Oracle)
2020-10-06 11:29   ` Jeff Layton [this message]
2020-10-06 17:20   ` Jeff Layton
2020-10-04 18:04 ` [PATCH 4/7] ocfs2: " Matthew Wilcox (Oracle)
2020-10-04 18:04 ` [PATCH 5/7] btrfs: " Matthew Wilcox (Oracle)
2020-10-09 14:18   ` Josef Bacik
2020-10-26 17:02   ` David Sterba
2020-10-04 18:04 ` [PATCH 6/7] " Matthew Wilcox (Oracle)
2020-10-09 14:18   ` Josef Bacik
2020-10-26 16:35   ` David Sterba
2020-10-26 16:44     ` Matthew Wilcox
2020-10-26 17:03       ` David Sterba
2020-10-04 18:04 ` [PATCH 7/7] btrfs: Promote to unsigned long long before multiplying Matthew Wilcox (Oracle)
2020-10-26 16:21   ` David Sterba

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