Update to working versionv0.1

Still way off from something usable by someone else but it already works
for me.

1 files changed, 60 insertions, 0 deletions

diff --git a/child.c b/child.c
new file mode 100644
index 0000000..d087064
--- /dev/null
+++ b/child.c
@@ -0,0 +1,60 @@
+/* uroot - User's root
+ *   child.c Source file for child with unshared resources
+ *
+ * Copyright (C) 2018 Karel Kočí
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+#define _GNU_SOURCE
+#include "child.h"
+#include <stdlib.h>
+#include <sys/mount.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+#include "utils.h"
+
+int child_main(void *_args) {
+	struct child_args *args = _args;
+	sigpipe_wait(args->sigpipe);
+
+	// Change some mount points to private
+	mount("none", "/", NULL, MS_REC | MS_PRIVATE, NULL);
+	assert_perror(errno);
+	/*
+	mount("none", "/proc", NULL, MS_REC | MS_PRIVATE, NULL);
+	assert_perror(errno);
+	mount("none", "/sys", NULL, MS_REC | MS_PRIVATE, NULL);
+	assert_perror(errno);
+	*/
+	// Mount new proc filesystem for this namespace
+	mount("proc", "/proc", "proc", MS_NOSUID | MS_NODEV | MS_NOEXEC, NULL);
+	assert_perror(errno);
+	//mount("binfmt_misc", "/proc/sys/fs/binfmt_misc", "binfmt_misc", MS_NOSUID|MS_NODEV|MS_NOEXEC, NULL);
+	//assert_perror(errno);
+
+	if (args->argc <= 1) {
+		const char *shell = get_shell();
+		execl(shell, shell, NULL);
+	} else {
+		char *new_argv[args->argc + 1];
+		memcpy(new_argv, args->argv + 1, args->argc * sizeof *new_argv);
+		new_argv[args->argc] = NULL;
+		execvp(args->argv[1], new_argv);
+		assert_perror(errno);
+	}
+	return 1;
+}