linux-kernel - Re: Fwd: fs/exec.c core dumping on NFS mounted directory

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Date:	Fri, 25 Jun 2010 16:01:17 -0400
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	Lei Sun <leisun124@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Fwd: fs/exec.c core dumping on NFS mounted directory

On Fri, 2010-06-25 at 12:32 -0700, Lei Sun wrote:
>   In 2.6.3x, I am logging in as a root and running app from NFS
> mounted directory. The app crashed with 0 bytes core file (I have set
> "ulimit -c unlimited", so it's not an issue).
> 
> Proposed patch:
> 
> --- exec.c 2010-05-19 17:33:16.000000000 -0700
> +++ exec.c.new 2010-05-19 17:33:07.000000000 -0700
> @@ -1859,7 +1859,7 @@
>      * Dont allow local users get cute and trick others to coredump
>      * into their pre-created files:
>      */
> - if (inode->i_uid != current_fsuid())
> + if (inode->i_bytes != 0 && inode->i_uid != current_fsuid())
>         goto close_fail;
> 
>     if (!file->f_op)
> 
... which would go ahead and reintroduce bugzilla entry 3043, but only
for those filesystems that set inode->i_bytes to zero:
           https://bugzilla.kernel.org/show_bug.cgi?id=3043

NACKed...

Trond

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