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SubjectRe: [PATCH] nfs: Fix NFS v4 client handling of MAY_EXEC in nfs_permission.
Frank Filz wrote:
> Sorry for the resend, got lkml address wrong...
>
> The problem is that permission checking is skipped if atomic open is
> possible, but when exec opens a file, it just opens it O_READONLY which
> means EXEC permission will not be checked at that time.
>
> This problem is observed by the following sequence (executed as root):
>
> mount -t nfs4 server:/ /mnt4
> echo "ls" >/mnt4/foo
> chmod 744 /mnt4/foo
> su guest -c "mnt4/foo"
>
> Signed-off-by: Frank Filz <ffilzlnx@us.ibm.com>

Tested-by: Eugene Teo <eugeneteo@kernel.sg>

Thanks, Eugene


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