From: Vivek Goyal Date: Wed, 13 Jul 2016 14:44:53 +0000 (-0400) Subject: selinux: Implement dentry_create_files_as() hook X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=a518b0a5b0d7f3397e065acb956bca9635aa892d;p=linux-beck.git selinux: Implement dentry_create_files_as() hook 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 Acked-by: Stephen Smalley Signed-off-by: Paul Moore --- diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index f9d398bc9dcd..e15e56081c0c 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -2848,6 +2848,27 @@ 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, @@ -6098,6 +6119,7 @@ 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),