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Administrator
Magisk
Commits
71789039
Commit
71789039
authored
Sep 11, 2017
by
topjohnwu
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Introduce magiskinit for Pixel (XL)
parent
b7b4164f
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2 changed files
with
214 additions
and
0 deletions
+214
-0
Android.mk
jni/Android.mk
+9
-0
magiskinit.c
jni/magiskinit.c
+205
-0
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jni/Android.mk
View file @
71789039
...
...
@@ -74,6 +74,15 @@ LOCAL_SRC_FILES := \
LOCAL_CFLAGS := -DZLIB_CONST
include $(BUILD_EXECUTABLE)
# magiskinit
ifeq ($(TARGET_ARCH_ABI), arm64-v8a)
include $(CLEAR_VARS)
LOCAL_MODULE := magiskinit
LOCAL_SRC_FILES := magiskinit.c
LOCAL_LDFLAGS := -static
include $(BUILD_EXECUTABLE)
endif
# 32-bit static binaries
ifneq ($(TARGET_ARCH_ABI), x86_64)
ifneq ($(TARGET_ARCH_ABI), arm64-v8a)
...
...
jni/magiskinit.c
0 → 100644
View file @
71789039
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <dirent.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/mount.h>
#include <sys/sendfile.h>
#include <sys/sysmacros.h>
struct
cmdline
{
int
skip_initramfs
;
char
slot
[
3
];
};
struct
device
{
dev_t
major
;
dev_t
minor
;
char
devname
[
32
];
char
partname
[
32
];
char
path
[
64
];
};
static
void
clone_dir
(
int
src
,
int
dest
)
{
struct
dirent
*
entry
;
DIR
*
dir
;
int
srcfd
,
destfd
,
newsrc
,
newdest
;
struct
stat
st
;
char
buf
[
PATH_MAX
];
ssize_t
size
;
dir
=
fdopendir
(
src
);
while
((
entry
=
readdir
(
dir
)))
{
if
(
strcmp
(
entry
->
d_name
,
"."
)
==
0
||
strcmp
(
entry
->
d_name
,
".."
)
==
0
)
continue
;
fstatat
(
src
,
entry
->
d_name
,
&
st
,
AT_SYMLINK_NOFOLLOW
);
switch
(
entry
->
d_type
)
{
case
DT_DIR
:
mkdirat
(
dest
,
entry
->
d_name
,
st
.
st_mode
&
0777
);
fchownat
(
dest
,
entry
->
d_name
,
st
.
st_uid
,
st
.
st_gid
,
0
);
// Don't clone recursive if it's /system
if
(
strcmp
(
entry
->
d_name
,
"system"
)
==
0
)
continue
;
newsrc
=
openat
(
src
,
entry
->
d_name
,
O_RDONLY
|
O_CLOEXEC
);
newdest
=
openat
(
dest
,
entry
->
d_name
,
O_RDONLY
|
O_CLOEXEC
);
clone_dir
(
newsrc
,
newdest
);
close
(
newsrc
);
close
(
newdest
);
break
;
case
DT_REG
:
destfd
=
openat
(
dest
,
entry
->
d_name
,
O_WRONLY
|
O_CREAT
|
O_TRUNC
|
O_CLOEXEC
,
st
.
st_mode
&
0777
);
srcfd
=
openat
(
src
,
entry
->
d_name
,
O_RDONLY
|
O_CLOEXEC
);
sendfile
(
destfd
,
srcfd
,
0
,
st
.
st_size
);
fchownat
(
dest
,
entry
->
d_name
,
st
.
st_uid
,
st
.
st_gid
,
0
);
close
(
destfd
);
close
(
srcfd
);
break
;
case
DT_LNK
:
size
=
readlinkat
(
src
,
entry
->
d_name
,
buf
,
sizeof
(
buf
));
buf
[
size
]
=
'\0'
;
symlinkat
(
buf
,
dest
,
entry
->
d_name
);
fchownat
(
dest
,
entry
->
d_name
,
st
.
st_uid
,
st
.
st_gid
,
AT_SYMLINK_NOFOLLOW
);
break
;
}
}
}
static
void
rm_rf
(
int
path
)
{
struct
dirent
*
entry
;
int
newfd
;
DIR
*
dir
=
fdopendir
(
path
);
while
((
entry
=
readdir
(
dir
)))
{
if
(
strcmp
(
entry
->
d_name
,
"."
)
==
0
||
strcmp
(
entry
->
d_name
,
".."
)
==
0
)
continue
;
switch
(
entry
->
d_type
)
{
case
DT_DIR
:
newfd
=
openat
(
path
,
entry
->
d_name
,
O_RDONLY
|
O_CLOEXEC
);
rm_rf
(
newfd
);
close
(
newfd
);
unlinkat
(
path
,
entry
->
d_name
,
AT_REMOVEDIR
);
break
;
default:
unlinkat
(
path
,
entry
->
d_name
,
0
);
break
;
}
}
}
static
void
parse_cmdline
(
struct
cmdline
*
cmd
)
{
char
*
tok
;
char
buffer
[
4096
];
mkdir
(
"/proc"
,
0555
);
mount
(
"proc"
,
"/proc"
,
"proc"
,
0
,
NULL
);
int
fd
=
open
(
"/proc/cmdline"
,
O_RDONLY
|
O_CLOEXEC
);
ssize_t
size
=
read
(
fd
,
buffer
,
sizeof
(
buffer
));
buffer
[
size
]
=
'\0'
;
close
(
fd
);
umount
(
"/proc"
);
tok
=
strtok
(
buffer
,
" "
);
cmd
->
skip_initramfs
=
0
;
cmd
->
slot
[
0
]
=
'\0'
;
while
(
tok
!=
NULL
)
{
if
(
strncmp
(
tok
,
"androidboot.slot_suffix"
,
23
)
==
0
)
{
sscanf
(
tok
,
"androidboot.slot_suffix=%s"
,
cmd
->
slot
);
}
else
if
(
strcmp
(
tok
,
"skip_initramfs"
)
==
0
)
{
cmd
->
skip_initramfs
=
1
;
break
;
}
tok
=
strtok
(
NULL
,
" "
);
}
}
static
void
parse_device
(
struct
device
*
dev
,
char
*
uevent
)
{
char
*
tok
;
tok
=
strtok
(
uevent
,
"
\n
"
);
while
(
tok
!=
NULL
)
{
if
(
strncmp
(
tok
,
"MAJOR"
,
5
)
==
0
)
{
sscanf
(
tok
,
"MAJOR=%ld"
,
(
long
*
)
&
dev
->
major
);
}
else
if
(
strncmp
(
tok
,
"MINOR"
,
5
)
==
0
)
{
sscanf
(
tok
,
"MINOR=%ld"
,
(
long
*
)
&
dev
->
minor
);
}
else
if
(
strncmp
(
tok
,
"DEVNAME"
,
7
)
==
0
)
{
sscanf
(
tok
,
"DEVNAME=%s"
,
dev
->
devname
);
}
else
if
(
strncmp
(
tok
,
"PARTNAME"
,
8
)
==
0
)
{
sscanf
(
tok
,
"PARTNAME=%s"
,
dev
->
partname
);
}
tok
=
strtok
(
NULL
,
"
\n
"
);
}
}
static
int
setup_block
(
struct
device
*
dev
,
const
char
*
partname
)
{
char
buffer
[
1024
],
path
[
128
];
mkdir
(
"/sys"
,
0755
);
mount
(
"sysfs"
,
"/sys"
,
"sysfs"
,
0
,
NULL
);
struct
dirent
*
entry
;
DIR
*
dir
=
opendir
(
"/sys/dev/block"
);
if
(
dir
==
NULL
)
return
1
;
int
found
=
0
;
while
((
entry
=
readdir
(
dir
)))
{
if
(
strcmp
(
entry
->
d_name
,
"."
)
==
0
||
strcmp
(
entry
->
d_name
,
".."
)
==
0
)
continue
;
snprintf
(
path
,
sizeof
(
path
),
"/sys/dev/block/%s/uevent"
,
entry
->
d_name
);
int
fd
=
open
(
path
,
O_RDONLY
|
O_CLOEXEC
);
ssize_t
size
=
read
(
fd
,
buffer
,
sizeof
(
buffer
));
buffer
[
size
]
=
'\0'
;
close
(
fd
);
parse_device
(
dev
,
buffer
);
if
(
strcmp
(
dev
->
partname
,
partname
)
==
0
)
{
snprintf
(
dev
->
path
,
sizeof
(
dev
->
path
),
"/dev/block/%s"
,
dev
->
devname
);
found
=
1
;
break
;
}
}
closedir
(
dir
);
if
(
!
found
)
return
1
;
mkdir
(
"/dev"
,
0755
);
mkdir
(
"/dev/block"
,
0755
);
mknod
(
dev
->
path
,
S_IFBLK
|
0600
,
makedev
(
dev
->
major
,
dev
->
minor
));
return
0
;
}
int
main
(
int
argc
,
char
*
argv
[])
{
umask
(
0
);
struct
cmdline
cmd
;
parse_cmdline
(
&
cmd
);
if
(
cmd
.
skip_initramfs
)
{
// Normal boot mode
// Clear rootfs
int
root
=
open
(
"/"
,
O_RDONLY
|
O_CLOEXEC
);
rm_rf
(
root
);
char
partname
[
32
];
snprintf
(
partname
,
sizeof
(
partname
),
"system%s"
,
cmd
.
slot
);
struct
device
dev
;
setup_block
(
&
dev
,
partname
);
mkdir
(
"/system_root"
,
0755
);
mount
(
dev
.
path
,
"/system_root"
,
"ext4"
,
MS_RDONLY
,
NULL
);
int
system_root
=
open
(
"/system_root"
,
O_RDONLY
|
O_CLOEXEC
);
clone_dir
(
system_root
,
root
);
mount
(
"/system_root/system"
,
"/system"
,
NULL
,
MS_BIND
,
NULL
);
close
(
root
);
close
(
system_root
);
}
else
{
// Recovery mode
// Revert original init binary
unlink
(
"/init"
);
rename
(
"/init_orig"
,
"/init"
);
}
execv
(
"/init"
,
argv
);
return
0
;
}
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