linux-kernel - Re: [PATCH] JFS: ensure link targets are NULL-terminated

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Message-ID: <e9e943910812111234h3e2bbc1bh934a6605f30b5fea@mail.gmail.com>
Date:	Thu, 11 Dec 2008 20:34:46 +0000
From:	"Duane Griffin" <duaneg@...da.com>
To:	"Dave Kleikamp" <shaggy@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	"Boaz Harrosh" <bharrosh@...asas.com>,
	Dave.Kleikamp.shaggy@...tin.ibm.com,
	jfs-discussion@...ts.sourceforge.net
Subject: Re: [PATCH] JFS: ensure link targets are NULL-terminated

2008/12/11 Dave Kleikamp <shaggy@...ux.vnet.ibm.com>:
> Thanks.
>
> I came up with an alternate patch that I like slightly better.  This one
> null-terminates the string when the inode is read rather than every time
> the link is followed, and at the proper place (i_size).  It's not a big
> deal, since the symlink will be corrupted either way.  What do you think
> of this patch?
>
> Signed-off-by: Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
>
> diff --git a/fs/jfs/inode.c b/fs/jfs/inode.c
> index 2103397..b00ee9f 100644
> --- a/fs/jfs/inode.c
> +++ b/fs/jfs/inode.c
> @@ -59,8 +59,14 @@ struct inode *jfs_iget(struct super_block *sb, unsigned long ino)
>                if (inode->i_size >= IDATASIZE) {
>                        inode->i_op = &page_symlink_inode_operations;
>                        inode->i_mapping->a_ops = &jfs_aops;
> -               } else
> +               } else {
>                        inode->i_op = &jfs_symlink_inode_operations;
> +                       /*
> +                        * The inline data should be null-terminated, but
> +                        * don't let on-disk corruption crash the kernel
> +                        */
> +                       JFS_IP(inode)->i_inline[inode->i_size] = '\0';
> +               }
>        } else {
>                inode->i_op = &jfs_file_inode_operations;
>                init_special_inode(inode, inode->i_mode, inode->i_rdev);

Yes, I prefer your version too :)

I'll rework the other patches similarly, where appropriate. Thanks!

Cheers,
Duane.

-- 
"I never could learn to drink that blood and call it wine" - Bob Dylan
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