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    Subject[PATCH 5/8] SELinux: Stub in copy-up handling
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    Date
    Provide stubs for union/overlay copy-up handling.  The xattr copy up stub
    discards lower SELinux xattrs rather than letting them be copied up so that
    the security label on the copy doesn't get corrupted.

    Signed-off-by: David Howells <dhowells@redhat.com>
    ---

    security/selinux/hooks.c | 16 ++++++++++++++++
    1 file changed, 16 insertions(+)

    diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
    index ffa5a642629a..c5d893e2ff23 100644
    --- a/security/selinux/hooks.c
    +++ b/security/selinux/hooks.c
    @@ -3200,6 +3200,20 @@ static void selinux_inode_getsecid(const struct inode *inode, u32 *secid)
    *secid = isec->sid;
    }

    +static int selinux_inode_copy_up(struct dentry *src, struct dentry *dst)
    +{
    + return 0;
    +}
    +
    +static int selinux_inode_copy_up_xattr(struct dentry *src, struct dentry *dst,
    + const char *name, void *value,
    + size_t *size)
    +{
    + if (strcmp(name, XATTR_NAME_SELINUX) == 0)
    + return 1; /* Discard */
    + return 0;
    +}
    +
    /* file security operations */

    static int selinux_revalidate_file_permission(struct file *file, int mask)
    @@ -5917,6 +5931,8 @@ static struct security_operations selinux_ops = {
    .inode_setsecurity = selinux_inode_setsecurity,
    .inode_listsecurity = selinux_inode_listsecurity,
    .inode_getsecid = selinux_inode_getsecid,
    + .inode_copy_up = selinux_inode_copy_up,
    + .inode_copy_up_xattr = selinux_inode_copy_up_xattr,

    .file_permission = selinux_file_permission,
    .file_alloc_security = selinux_file_alloc_security,


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