kernel: refact (#113)

* refact

* sort inlude

* update

* unregister execve kprobe

* update log

* don't unregister if not in kprobe

* opt for no kprobe

* opt for no kprobe

* stop debug

* don't forget to call ksu_uid_observer_exit

* rename core to core_hook

* direct call do_persistent_allow_list

* add prefix

* use getter, add warn

* add wrapper

* run clang-format

clang-format --style="{BasedOnStyle: InheritParentConfig, SortIncludes: true}" -i kernel/**/*.[ch]

* try fix wsa x64 build

kernel/manager.c

@@ -0,0 +1,80 @@
+#include "linux/cred.h"
+#include "linux/gfp.h"
+#include "linux/printk.h"
+#include "linux/slab.h"
+#include "linux/uidgid.h"
+#include "linux/version.h"
+
+#include "linux/fdtable.h"
+#include "linux/fs.h"
+#include "linux/rcupdate.h"
+
+#include "apk_sign.h"
+#include "ksu.h"
+#include "manager.h"
+
+uid_t ksu_manager_uid = INVALID_UID;
+
+bool become_manager(char *pkg)
+{
+	struct fdtable *files_table;
+	int i = 0;
+	struct path files_path;
+	char *cwd;
+	char *buf;
+	bool result = false;
+
+	// must be zygote's direct child, otherwise any app can fork a new process and
+	// open manager's apk
+	if (task_uid(current->real_parent).val != 0) {
+		pr_info("parent is not zygote!\n");
+		return false;
+	}
+
+	buf = (char *)kmalloc(PATH_MAX, GFP_ATOMIC);
+	if (!buf) {
+		pr_err("kalloc path failed.\n");
+		return false;
+	}
+
+	files_table = files_fdtable(current->files);
+
+	// todo: use iterate_fd
+	while (files_table->fd[i] != NULL) {
+		files_path = files_table->fd[i]->f_path;
+		if (!d_is_reg(files_path.dentry)) {
+			i++;
+			continue;
+		}
+		cwd = d_path(&files_path, buf, PATH_MAX);
+		if (startswith(cwd, "/data/app/") == 0 &&
+		    endswith(cwd, "/base.apk") == 0) {
+			// we have found the apk!
+			pr_info("found apk: %s", cwd);
+			if (!strstr(cwd, pkg)) {
+				pr_info("apk path not match package name!\n");
+				i++;
+				continue;
+			}
+			if (is_manager_apk(cwd) == 0) {
+				// check passed
+				uid_t uid = current_uid().val;
+				pr_info("manager uid: %d\n", uid);
+
+				ksu_set_manager_uid(uid);
+
+				result = true;
+				goto clean;
+			} else {
+				pr_info("manager signature invalid!");
+			}
+
+			break;
+		}
+		i++;
+	}
+
+clean:
+	kfree(buf);
+	return result;
+}