Comments (3)
chenxiaolong
commented on August 27, 2024
All other issues are currently blocked by this as my S4 is my only testing device right now (tripping KNOX disables Samsung Pay on my S6E+...).
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chenxiaolong
commented on August 27, 2024
An upcoming release will include a heavily stripped down fork of adbd, miniadbd, which can be used for debugging issues during the mbtool init stage. If enabled, it is spawned instead of the ROM's /init binary
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chenxiaolong
commented on August 27, 2024
Just ran /init through strace in miniadbd. It looks like the policy is preventing another policy from being loaded by init's stage 1 because it's initially running under the u:r:kernel:s0 context. We may want to copy /sepolicy to another file, patch it to make all types permissive, and load the temporary policy. Then, we can relabel files any way we need during the mbtool stage. Once the real /init takes over, it will load the real policy.
EDIT: Yep, patching the policy is the way to go. I originally had the incorrect assumption that I could do:
if (!selinux_set_enforcing(0)) {
LOGW("Failed to set SELinux to permissive mode");
}
// Load policy
...
but the policy is able to override the global enforcing status.
root@android:/ # umount /sys/fs/selinux
root@android:/ # /strace_static /init
execve("/init", ["/init"], [/* 16 vars */]) = 0
getrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM_INFINITY}) = 0
gettid() = 301
set_tls(0x9497c, 0xfffffe00, 0, 0x9497c, 0x94bb0) = 0
mmap2(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0) = 0xb6f59000
madvise(0xb6f59000, 8192, MADV_MERGEABLE) = -1 EINVAL (Invalid argument)
sigaltstack({ss_sp=0xb6f59000, ss_flags=0, ss_size=8192}, NULL) = 0
open("/dev/__properties__", O_RDONLY|O_NOFOLLOW) = -1 ENOENT (No such file or directory)
fstat64(7, {st_mode=S_IFREG|0600, st_size=32768, ...}) = 0
mmap2(NULL, 32768, PROT_READ, MAP_SHARED, 7, 0) = 0xb6f51000
mprotect(0x86000, 40960, PROT_READ) = 0
statfs64("/sys/fs/selinux", 88, {f_type="SYSFS_MAGIC", f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096, f_flags=4128}) = 0
open("/proc/filesystems", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
gettimeofday({1389738735, 146875}, NULL) = 0
brk(0) = 0x96000
brk(0x96000) = 0x96000
brk(0x97000) = 0x97000
read(3, "nodev\tsysfs\nnodev\trootfs\nnodev\tb"..., 1024) = 333
close(3) = 0
open("/proc/mounts", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
read(3, "rootfs / rootfs rw 0 0\ntmpfs /de"..., 1024) = 1024
read(3, "abel,relatime,discard,journal_ch"..., 1024) = 752
read(3, "", 1024) = 0
close(3) = 0
clock_gettime(CLOCK_MONOTONIC, {53, 660641049}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb6f50000
madvise(0xb6f50000, 4096, MADV_MERGEABLE) = -1 EINVAL (Invalid argument)
mprotect(0xb6f50000, 4096, PROT_READ) = 0
brk(0x98000) = 0x98000
umask(0) = 0
mkdir("/dev", 0755) = -1 EEXIST (File exists)
mkdir("/proc", 0755) = -1 EEXIST (File exists)
mkdir("/sys", 0755) = -1 EEXIST (File exists)
mount("tmpfs", "/dev", "tmpfs", MS_NOSUID, "mode=0755") = 0
mkdir("/dev/pts", 0755) = 0
mkdir("/dev/socket", 0755) = 0
mount("devpts", "/dev/pts", "devpts", 0, NULL) = 0
mount("proc", "/proc", "proc", 0, NULL) = -1 EBUSY (Device or resource busy)
mount("sysfs", "/sys", "sysfs", 0, NULL) = -1 EBUSY (Device or resource busy)
open("/dev/.booting", O_WRONLY|O_CREAT, 0) = 3
close(3) = 0
mknod("/dev/__null__", S_IFCHR|0600, makedev(1, 3)) = 0
open("/dev/__null__", O_RDWR) = 3
unlink("/dev/__null__") = 0
dup2(3, 0) = 0
dup2(3, 1) = 1
dup2(3, 2) = 2
close(3) = 0
mknod("/dev/__kmsg__", S_IFCHR|0600, makedev(1, 11)) = 0
open("/dev/__kmsg__", O_WRONLY) = 3
fcntl64(3, F_SETFD, FD_CLOEXEC) = 0
unlink("/dev/__kmsg__") = 0
write(3, "!@Boot: Start init process\n", 27) = 27
open("/dev/__properties__", O_RDWR|O_CREAT|O_EXCL|O_NOFOLLOW, 0444) = 4
fcntl64(4, F_SETFD, FD_CLOEXEC) = 0
ftruncate(4, 131072) = 0
mmap2(NULL, 131072, PROT_READ|PROT_WRITE, MAP_SHARED, 4, 0) = 0xb6f30000
close(4) = 0
open("/dev/__properties__", O_RDONLY|O_NOFOLLOW) = 4
fcntl64(4, F_SETFD, FD_CLOEXEC) = 0
open("/proc/cpuinfo", O_RDONLY) = 5
read(5, "Processor\t: ARMv7 Processor rev "..., 1023) = 395
close(5) = 0
chmod("/proc/cmdline", 0440) = 0
open("/proc/cmdline", O_RDONLY) = 5
read(5, "console=null androidboot.hardwar"..., 1023) = 868
close(5) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
futex(0xb6f30004, FUTEX_WAKE, 2147483647) = 0
access("/sys/fs/selinux", F_OK) = 0
mount("selinuxfs", "/sys/fs/selinux", "selinuxfs", 0, NULL) = 0
open("/data/security/sepolicy", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/data/security/spota/sepolicy_version", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/sepolicy_version", O_RDONLY) = 5
fstat64(5, {st_mode=S_IFREG|0644, st_size=236, ...}) = 0
brk(0x99000) = 0x99000
read(5, "VE=SEPF_SGH-M919_4.4.4_0024\nHS=6"..., 4096) = 236
close(5) = 0
open("/dev/log/main", O_WRONLY) = -1 ENOENT (No such file or directory)
open("/dev/log/radio", O_WRONLY) = -1 ENOENT (No such file or directory)
open("/dev/log/events", O_WRONLY) = -1 ENOENT (No such file or directory)
open("/dev/log/system", O_WRONLY) = -1 ENOENT (No such file or directory)
close(-1) = -1 EBADF (Bad file number)
close(-1) = -1 EBADF (Bad file number)
close(-1) = -1 EBADF (Bad file number)
open("/sepolicy", O_RDONLY|O_NOFOLLOW) = 5
fstat64(5, {st_mode=S_IFREG|0644, st_size=1438251, ...}) = 0
mmap2(NULL, 1438251, PROT_READ, MAP_PRIVATE, 5, 0) = 0xb6dd0000
madvise(0xb6dd0000, 1438251, MADV_MERGEABLE) = -1 EINVAL (Invalid argument)
open("/sys/fs/selinux/load", O_RDWR) = 6
write(6, "\214\377|\371\10\0\0\0SE Linux\32\0\0\0\1\0\0\0\10\0\0\0\7\0\0\0"..., 1438251) = -1 EACCES (Permission denied)
close(6) = 0
munmap(0xb6dd0000, 1438251) = 0
close(5) = 0
write(3, "<3>init: SELinux: Failed to load"..., 70) = 70
sync() = 0
open("/proc/sysrq-trigger", O_WRONLY) = 5
write(5, "u", 1) = 1
close(5) = 0
open("/proc/mounts", O_RDONLY) = 5
fstat64(5, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
read(5, "rootfs / rootfs rw 0 0\ntmpfs /de"..., 1024) = 1024
close(5) = 0
nanosleep({0, 100000000}, 0xbe814c00) = 0
open("/proc/mounts", O_RDONLY) = 5
fstat64(5, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
read(5, "rootfs / rootfs rw 0 0\ntmpfs /de"..., 1024) = 1024
read(5, "abel,relatime,discard,journal_ch"..., 1024) = 919
read(5, "", 1024) = 0
close(5) = 0
reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, LINUX_REBOOT_CMD_RESTART2, "recovery"
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