1 files changed, 0 insertions, 271 deletions
diff --git a/kernel/bpf/token.c b/kernel/bpf/token.c
deleted file mode 100644
index a86fccd57e2d..000000000000
--- a/kernel/bpf/token.c
+++ /dev/null
@@ -1,271 +0,0 @@
-#include <linux/bpf.h>
-#include <linux/vmalloc.h>
-#include <linux/fdtable.h>
-#include <linux/file.h>
-#include <linux/fs.h>
-#include <linux/kernel.h>
-#include <linux/idr.h>
-#include <linux/namei.h>
-#include <linux/user_namespace.h>
-#include <linux/security.h>
-
-bool bpf_token_capable(const struct bpf_token *token, int cap)
-{
-	/* BPF token allows ns_capable() level of capabilities, but only if
-	 * token's userns is *exactly* the same as current user's userns
-	 */
-	if (token && current_user_ns() == token->userns) {
-		if (ns_capable(token->userns, cap) ||
-		    (cap != CAP_SYS_ADMIN && ns_capable(token->userns, CAP_SYS_ADMIN)))
-			return security_bpf_token_capable(token, cap) == 0;
-	}
-	/* otherwise fallback to capable() checks */
-	return capable(cap) || (cap != CAP_SYS_ADMIN && capable(CAP_SYS_ADMIN));
-}
-
-void bpf_token_inc(struct bpf_token *token)
-{
-	atomic64_inc(&token->refcnt);
-}
-
-static void bpf_token_free(struct bpf_token *token)
-{
-	security_bpf_token_free(token);
-	put_user_ns(token->userns);
-	kvfree(token);
-}
-
-static void bpf_token_put_deferred(struct work_struct *work)
-{
-	struct bpf_token *token = container_of(work, struct bpf_token, work);
-
-	bpf_token_free(token);
-}
-
-void bpf_token_put(struct bpf_token *token)
-{
-	if (!token)
-		return;
-
-	if (!atomic64_dec_and_test(&token->refcnt))
-		return;
-
-	INIT_WORK(&token->work, bpf_token_put_deferred);
-	schedule_work(&token->work);
-}
-
-static int bpf_token_release(struct inode *inode, struct file *filp)
-{
-	struct bpf_token *token = filp->private_data;
-
-	bpf_token_put(token);
-	return 0;
-}
-
-static void bpf_token_show_fdinfo(struct seq_file *m, struct file *filp)
-{
-	struct bpf_token *token = filp->private_data;
-	u64 mask;
-
-	BUILD_BUG_ON(__MAX_BPF_CMD >= 64);
-	mask = (1ULL << __MAX_BPF_CMD) - 1;
-	if ((token->allowed_cmds & mask) == mask)
-		seq_printf(m, "allowed_cmds:\tany\n");
-	else
-		seq_printf(m, "allowed_cmds:\t0x%llx\n", token->allowed_cmds);
-
-	BUILD_BUG_ON(__MAX_BPF_MAP_TYPE >= 64);
-	mask = (1ULL << __MAX_BPF_MAP_TYPE) - 1;
-	if ((token->allowed_maps & mask) == mask)
-		seq_printf(m, "allowed_maps:\tany\n");
-	else
-		seq_printf(m, "allowed_maps:\t0x%llx\n", token->allowed_maps);
-
-	BUILD_BUG_ON(__MAX_BPF_PROG_TYPE >= 64);
-	mask = (1ULL << __MAX_BPF_PROG_TYPE) - 1;
-	if ((token->allowed_progs & mask) == mask)
-		seq_printf(m, "allowed_progs:\tany\n");
-	else
-		seq_printf(m, "allowed_progs:\t0x%llx\n", token->allowed_progs);
-
-	BUILD_BUG_ON(__MAX_BPF_ATTACH_TYPE >= 64);
-	mask = (1ULL << __MAX_BPF_ATTACH_TYPE) - 1;
-	if ((token->allowed_attachs & mask) == mask)
-		seq_printf(m, "allowed_attachs:\tany\n");
-	else
-		seq_printf(m, "allowed_attachs:\t0x%llx\n", token->allowed_attachs);
-}
-
-#define BPF_TOKEN_INODE_NAME "bpf-token"
-
-static const struct inode_operations bpf_token_iops = { };
-
-static const struct file_operations bpf_token_fops = {
-	.release	= bpf_token_release,
-	.show_fdinfo	= bpf_token_show_fdinfo,
-};
-
-int bpf_token_create(union bpf_attr *attr)
-{
-	struct bpf_mount_opts *mnt_opts;
-	struct bpf_token *token = NULL;
-	struct user_namespace *userns;
-	struct inode *inode;
-	struct file *file;
-	struct path path;
-	struct fd f;
-	umode_t mode;
-	int err, fd;
-
-	f = fdget(attr->token_create.bpffs_fd);
-	if (!f.file)
-		return -EBADF;
-
-	path = f.file->f_path;
-	path_get(&path);
-	fdput(f);
-
-	if (path.dentry != path.mnt->mnt_sb->s_root) {
-		err = -EINVAL;
-		goto out_path;
-	}
-	if (path.mnt->mnt_sb->s_op != &bpf_super_ops) {
-		err = -EINVAL;
-		goto out_path;
-	}
-	err = path_permission(&path, MAY_ACCESS);
-	if (err)
-		goto out_path;
-
-	userns = path.dentry->d_sb->s_user_ns;
-	/*
-	 * Enforce that creators of BPF tokens are in the same user
-	 * namespace as the BPF FS instance. This makes reasoning about
-	 * permissions a lot easier and we can always relax this later.
-	 */
-	if (current_user_ns() != userns) {
-		err = -EPERM;
-		goto out_path;
-	}
-	if (!ns_capable(userns, CAP_BPF)) {
-		err = -EPERM;
-		goto out_path;
-	}
-
-	mnt_opts = path.dentry->d_sb->s_fs_info;
-	if (mnt_opts->delegate_cmds == 0 &&
-	    mnt_opts->delegate_maps == 0 &&
-	    mnt_opts->delegate_progs == 0 &&
-	    mnt_opts->delegate_attachs == 0) {
-		err = -ENOENT; /* no BPF token delegation is set up */
-		goto out_path;
-	}
-
-	mode = S_IFREG | ((S_IRUSR | S_IWUSR) & ~current_umask());
-	inode = bpf_get_inode(path.mnt->mnt_sb, NULL, mode);
-	if (IS_ERR(inode)) {
-		err = PTR_ERR(inode);
-		goto out_path;
-	}
-
-	inode->i_op = &bpf_token_iops;
-	inode->i_fop = &bpf_token_fops;
-	clear_nlink(inode); /* make sure it is unlinked */
-
-	file = alloc_file_pseudo(inode, path.mnt, BPF_TOKEN_INODE_NAME, O_RDWR, &bpf_token_fops);
-	if (IS_ERR(file)) {
-		iput(inode);
-		err = PTR_ERR(file);
-		goto out_path;
-	}
-
-	token = kvzalloc(sizeof(*token), GFP_USER);
-	if (!token) {
-		err = -ENOMEM;
-		goto out_file;
-	}
-
-	atomic64_set(&token->refcnt, 1);
-
-	/* remember bpffs owning userns for future ns_capable() checks */
-	token->userns = get_user_ns(userns);
-
-	token->allowed_cmds = mnt_opts->delegate_cmds;
-	token->allowed_maps = mnt_opts->delegate_maps;
-	token->allowed_progs = mnt_opts->delegate_progs;
-	token->allowed_attachs = mnt_opts->delegate_attachs;
-
-	err = security_bpf_token_create(token, attr, &path);
-	if (err)
-		goto out_token;
-
-	fd = get_unused_fd_flags(O_CLOEXEC);
-	if (fd < 0) {
-		err = fd;
-		goto out_token;
-	}
-
-	file->private_data = token;
-	fd_install(fd, file);
-
-	path_put(&path);
-	return fd;
-
-out_token:
-	bpf_token_free(token);
-out_file:
-	fput(file);
-out_path:
-	path_put(&path);
-	return err;
-}
-
-struct bpf_token *bpf_token_get_from_fd(u32 ufd)
-{
-	struct fd f = fdget(ufd);
-	struct bpf_token *token;
-
-	if (!f.file)
-		return ERR_PTR(-EBADF);
-	if (f.file->f_op != &bpf_token_fops) {
-		fdput(f);
-		return ERR_PTR(-EINVAL);
-	}
-
-	token = f.file->private_data;
-	bpf_token_inc(token);
-	fdput(f);
-
-	return token;
-}
-
-bool bpf_token_allow_cmd(const struct bpf_token *token, enum bpf_cmd cmd)
-{
-	/* BPF token can be used only within exactly the same userns in which
-	 * it was created
-	 */
-	if (!token || current_user_ns() != token->userns)
-		return false;
-	if (!(token->allowed_cmds & (1ULL << cmd)))
-		return false;
-	return security_bpf_token_cmd(token, cmd) == 0;
-}
-
-bool bpf_token_allow_map_type(const struct bpf_token *token, enum bpf_map_type type)
-{
-	if (!token || type >= __MAX_BPF_MAP_TYPE)
-		return false;
-
-	return token->allowed_maps & (1ULL << type);
-}
-
-bool bpf_token_allow_prog_type(const struct bpf_token *token,
-			       enum bpf_prog_type prog_type,
-			       enum bpf_attach_type attach_type)
-{
-	if (!token || prog_type >= __MAX_BPF_PROG_TYPE || attach_type >= __MAX_BPF_ATTACH_TYPE)
-		return false;
-
-	return (token->allowed_progs & (1ULL << prog_type)) &&
-	       (token->allowed_attachs & (1ULL << attach_type));
-}