On 07/13/2016 10:44 AM, Vivek Goyal wrote:
> Calculate what would be the label of newly created file and set that secid
> in the passed creds.
>
> Context of the task which is actually creating file is retrieved from
> set of creds passed in. (old->security).
>
> Signed-off-by: Vivek Goyal <vgoyal@xxxxxxxxxx>
Acked-by: Stephen Smalley <sds@xxxxxxxxxxxxx>
> ---
> security/selinux/hooks.c | 22 ++++++++++++++++++++++
> 1 file changed, 22 insertions(+)
>
> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> index ae11fd9..77eb5a8 100644
> --- a/security/selinux/hooks.c
> +++ b/security/selinux/hooks.c
> @@ -2825,6 +2825,27 @@ static int selinux_dentry_init_security(struct dentry *dentry, int mode,
> return security_sid_to_context(newsid, (char **)ctx, ctxlen);
> }
>
> +static int selinux_dentry_create_files_as(struct dentry *dentry, int mode,
> + struct qstr *name,
> + const struct cred *old,
> + struct cred *new)
> +{
> + u32 newsid;
> + int rc;
> + struct task_security_struct *tsec;
> +
> + rc = selinux_determine_inode_label(old->security,
> + d_inode(dentry->d_parent), name,
> + inode_mode_to_security_class(mode),
> + &newsid);
> + if (rc)
> + return rc;
> +
> + tsec = new->security;
> + tsec->create_sid = newsid;
> + return 0;
> +}
> +
> static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
> const struct qstr *qstr,
> const char **name,
> @@ -6066,6 +6087,7 @@ static struct security_hook_list selinux_hooks[] = {
> LSM_HOOK_INIT(sb_parse_opts_str, selinux_parse_opts_str),
>
> LSM_HOOK_INIT(dentry_init_security, selinux_dentry_init_security),
> + LSM_HOOK_INIT(dentry_create_files_as, selinux_dentry_create_files_as),
>
> LSM_HOOK_INIT(inode_alloc_security, selinux_inode_alloc_security),
> LSM_HOOK_INIT(inode_free_security, selinux_inode_free_security),
>
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