Re: [NEW-PATCH] exec: allow > 2GB executables to run on 64-bit systems

[Dave Anderson <anderson@redhat.com>]

Andi Kleen wrote:
> Since Dave didn't post an updated patch. This is how I think what
> the patch should be. I also changed sys_uselib just to be complete.

Thanks Andi -- I just tested open_exec() w/O_LARGEFILE on an
i386 with a 2.5GB+ binary (mostly debuginfo), and it works as
expected.  Interesting to note that the test binary couldn't
be compiled with i386 gcc, but it could be built with x86_64
gcc -m32.

Dave


> ----
>
>
> Always use O_LARGEFILE for opening executables
>
> This allows to use executables >2GB.
>
> Based on a patch by Dave Anderson
>
> Signed-off-by: Andi Kleen <ak@suse.de>
>
> Index: linux-2.6.24-rc3/fs/exec.c
> ===================================================================
> --- linux-2.6.24-rc3.orig/fs/exec.c
> +++ linux-2.6.24-rc3/fs/exec.c
> @@ -119,7 +119,7 @@ asmlinkage long sys_uselib(const char __
>  	if (error)
>  		goto exit;
>  
> -	file = nameidata_to_filp(&nd, O_RDONLY);
> +	file = nameidata_to_filp(&nd, O_RDONLY|O_LARGEFILE);
>  	error = PTR_ERR(file);
>  	if (IS_ERR(file))
>  		goto out;
> @@ -658,7 +658,8 @@ struct file *open_exec(const char *name)
>  			int err = vfs_permission(&nd, MAY_EXEC);
>  			file = ERR_PTR(err);
>  			if (!err) {
> -				file = nameidata_to_filp(&nd, O_RDONLY);
> +				file = nameidata_to_filp(&nd,
> +							O_RDONLY|O_LARGEFILE);
>  				if (!IS_ERR(file)) {
>  					err = deny_write_access(file);
>  					if (err) {


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