diff options
| author | Vivek Goyal <vgoyal@redhat.com> | 2016-07-13 16:44:48 +0200 |
|---|---|---|
| committer | Paul Moore <paul@paul-moore.com> | 2016-08-09 02:41:52 +0200 |
| commit | 56909eb3f559103196ecbf2c08c923e0804980fb (patch) | |
| tree | 5a0df1c21ea1acec5730298ef08df8b8d930cfe4 | |
| parent | security, overlayfs: provide copy up security hook for unioned files (diff) | |
| download | linux-56909eb3f559103196ecbf2c08c923e0804980fb.tar.xz linux-56909eb3f559103196ecbf2c08c923e0804980fb.zip | |
selinux: Implementation for inode_copy_up() hook
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>
| -rw-r--r-- | security/selinux/hooks.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 880f9533863f..40597ed00ba9 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -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), |