MarcoBuster/Magisk
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More fail proof to magiskinit

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This commit is contained in:
topjohnwu 2017-12-05 21:05:20 +08:00
parent 39a6bd33ce
commit 742dc137ed
1 changed files with 24 additions and 14 deletions
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16
core/jni/core/magiskinit.c
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@ -21,6 +21,7 @@
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
@ -385,7 +386,6 @@ static void magisk_init_daemon() {
exit(1);
}
}
exit(0);
}
int main(int argc, char *argv[]) {
@ -403,6 +403,14 @@ int main(int argc, char *argv[]) {
return dump_magiskrc(argv[3], 0755);
}
// Prevent file descriptor confusion
mknod("/null", S_IFCHR | 0666, makedev(1, 3));
int null = open("/null", O_RDWR | O_CLOEXEC);
unlink("/null");
dup3(null, STDIN_FILENO, O_CLOEXEC);
dup3(null, STDOUT_FILENO, O_CLOEXEC);
dup3(null, STDERR_FILENO, O_CLOEXEC);
// Extract and link files
mkdir("/overlay", 0000);
dump_magiskrc("/overlay/init.magisk.rc", 0750);
@ -456,6 +464,8 @@ int main(int argc, char *argv[]) {
link("/.backup/init", "/init");
}
// Only patch initramfs if not intended to run in recovery (legacy devices)
if (access("/etc/recovery.fstab", F_OK) != 0) {
int overlay = open("/overlay", O_RDONLY | O_CLOEXEC);
mv_dir(overlay, root);
@ -467,13 +477,13 @@ int main(int argc, char *argv[]) {
patch_ramdisk();
patch_sepolicy();
umount("/vendor");
if (fork_dont_care() == 0) {
strcpy(argv[0], "magiskinit");
magisk_init_daemon();
}
}
umount("/vendor");
// Finally, give control back!
execv("/init", argv);
}