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selinux: Implementation for inode_copy_up() hook

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A file is being copied up for overlay file system. Prepare a new set of
creds and set create_sid appropriately so that new file is created with
appropriate label.

Overlay inode has right label for both context and non-context mount
cases. In case of non-context mount, overlay inode will have the label
of lower file and in case of context mount, overlay inode will have
the label from context= mount option.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Vivek Goyal 2016-07-13 10:44:48 -04:00 committed by Paul Moore
parent d8ad8b4961
commit 56909eb3f5
1 changed files with 21 additions and 0 deletions
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21
security/selinux/hooks.c
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@ -3293,6 +3293,26 @@ static void selinux_inode_getsecid(struct inode *inode, u32 *secid)
*secid = isec->sid;
}
static int selinux_inode_copy_up(struct dentry *src, struct cred **new)
{
u32 sid;
struct task_security_struct *tsec;
struct cred *new_creds = *new;
if (new_creds == NULL) {
new_creds = prepare_creds();
if (!new_creds)
return -ENOMEM;
}
tsec = new_creds->security;
/* Get label from overlay inode and set it in create_sid */
selinux_inode_getsecid(d_inode(src), &sid);
tsec->create_sid = sid;
*new = new_creds;
return 0;
}
/* file security operations */
static int selinux_revalidate_file_permission(struct file *file, int mask)
@ -6088,6 +6108,7 @@ static struct security_hook_list selinux_hooks[] = {
LSM_HOOK_INIT(inode_setsecurity, selinux_inode_setsecurity),
LSM_HOOK_INIT(inode_listsecurity, selinux_inode_listsecurity),
LSM_HOOK_INIT(inode_getsecid, selinux_inode_getsecid),
LSM_HOOK_INIT(inode_copy_up, selinux_inode_copy_up),
LSM_HOOK_INIT(file_permission, selinux_file_permission),
LSM_HOOK_INIT(file_alloc_security, selinux_file_alloc_security),