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Move sbin overlay creation to magiskinit

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This commit is contained in:
topjohnwu
2019-02-09 01:51:46 -05:00
parent 08e3405394
commit c8491d008f
8 changed files with 214 additions and 163 deletions
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75
native/jni/utils/selinux.cpp
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@@ -1,6 +1,9 @@
#include <dlfcn.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <syscall.h>
#include <sys/xattr.h>
#include "magisk.h"
#include "utils.h"
@@ -11,27 +14,73 @@
#define ADB_CON "u:object_r:adb_data_file:s0"
#define MAGISK_CON "u:object_r:" SEPOL_FILE_DOMAIN ":s0"
// Stub implementations
// Stub implementation
static void v_s(char *s) { delete[] s; }
static int stub(const char *) { return 0; }
static int i_s(const char *) { return 0; }
static int stub(const char *, const char *) { return 0; }
static int i_ss(const char *, const char *) { return 0; }
static int i_ssp(const char *, char ** sp) {
*sp = new char[1]();
static int stub(const char *, char **ctx) {
*ctx = strdup("");
return 0;
}
// Builtin implementation
static void __freecon(char *s) {
free(s);
}
static int __setcon(const char *ctx) {
int fd = open("/proc/self/attr/current", O_WRONLY | O_CLOEXEC);
if (fd < 0)
return fd;
size_t len = strlen(ctx) + 1;
int rc = write(fd, ctx, len);
close(fd);
return rc != len;
}
static int __getfilecon(const char *path, char **ctx) {
char buf[1024];
int rc = syscall(__NR_getxattr, path, XATTR_NAME_SELINUX, buf, sizeof(buf) - 1);
if (rc > 0)
*ctx = strdup(buf);
return rc;
}
static int __lgetfilecon(const char *path, char **ctx) {
char buf[1024];
int rc = syscall(__NR_lgetxattr, path, XATTR_NAME_SELINUX, buf, sizeof(buf) - 1);
if (rc > 0)
*ctx = strdup(buf);
return rc;
}
static int __setfilecon(const char *path, const char *ctx) {
return syscall(__NR_setxattr, path, XATTR_NAME_SELINUX, ctx, strlen(ctx) + 1, 0);
}
static int __lsetfilecon(const char *path, const char *ctx) {
return syscall(__NR_lsetxattr, path, XATTR_NAME_SELINUX, ctx, strlen(ctx) + 1, 0);
}
// Function pointers
void (*freecon)(char *) = v_s;
int (*setcon)(const char *) = i_s;
int (*getfilecon)(const char *, char **) = i_ssp;
int (*lgetfilecon)(const char *, char **) = i_ssp;
int (*setfilecon)(const char *, const char *) = i_ss;
int (*lsetfilecon)(const char *, const char *) = i_ss;
void (*freecon)(char *) = __freecon;
int (*setcon)(const char *) = stub;
int (*getfilecon)(const char *, char **) = stub;
int (*lgetfilecon)(const char *, char **) = stub;
int (*setfilecon)(const char *, const char *) = stub;
int (*lsetfilecon)(const char *, const char *) = stub;
void selinux_builtin_impl() {
setcon = __setcon;
getfilecon = __getfilecon;
lgetfilecon = __lgetfilecon;
setfilecon = __setfilecon;
setfilecon = __lsetfilecon;
}
void dload_selinux() {
void *handle = dlopen("libselinux.so", RTLD_LAZY);