On Wed, 2010-07-07 at 10:31 -0400, David P. Quigley wrote:
> There is a time where we need to calculate a context without the
> inode having been created yet. To do this we take the negative dentry and
> calculate a context based on the process and the parent directory contexts.
>
> Signed-off-by: Matthew N. Dodd <Matthew.Dodd@xxxxxxxxxx>
> Signed-off-by: David P. Quigley <dpquigl@xxxxxxxxxxxxx>
> ---
> include/linux/security.h | 22 ++++++++++++++++++++++
> security/capability.c | 6 ++++++
> security/security.c | 7 +++++++
> security/selinux/hooks.c | 32 ++++++++++++++++++++++++++++++++
> 4 files changed, 67 insertions(+), 0 deletions(-)
>
> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> index 5feecb4..435c51f 100644
> --- a/security/selinux/hooks.c
> +++ b/security/selinux/hooks.c
> @@ -2577,6 +2577,37 @@ static void selinux_inode_free_security(struct inode *inode)
> inode_free_security(inode);
> }
>
> +static int selinux_dentry_init_security(struct dentry *dentry, int mode, void **ctx, u32 *ctxlen)
> +{
> + struct cred *cred = current_cred();
> + struct task_security_struct *tsec;
> + struct inode_security_struct *dsec;
> + struct superblock_security_struct *sbsec;
> + struct inode *dir = dentry->d_parent->d_inode;
Locking?
> + u32 newsid;
> + int rc;
> +
> + tsec = cred->security;
> + dsec = dir->i_security;
> + sbsec = dir->i_sb->s_security;
> +
> + if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) {
The logic in selinux_inode_init_security() has changed to use
(sbsec->flags & SE_SBLABELSUPP) instead. Possibly you should factor the
common code into a helper.
> + newsid = tsec->create_sid;
> + } else {
> + rc = security_transition_sid(tsec->sid, dsec->sid,
> + inode_mode_to_security_class(mode),
> + &newsid);
> + if (rc) {
> + printk(KERN_WARNING "%s: "
> + "security_transition_sid failed, rc=%d\n",
> + __FUNCTION__, -rc);
> + return rc;
> + }
> + }
> +
> + return security_sid_to_context(newsid, (char **)ctx, ctxlen);
> +}
> +
> static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
> char **name, void **value,
> size_t *len)
> @@ -5484,6 +5515,7 @@ static struct security_operations selinux_ops = {
> .sb_clone_mnt_opts = selinux_sb_clone_mnt_opts,
> .sb_parse_opts_str = selinux_parse_opts_str,
>
> + .dentry_init_security = selinux_dentry_init_security,
>
> .inode_alloc_security = selinux_inode_alloc_security,
> .inode_free_security = selinux_inode_free_security,
--
Stephen Smalley
National Security Agency
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