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Administrator
Magisk
Commits
ff7c38f8
Commit
ff7c38f8
authored
Sep 12, 2017
by
topjohnwu
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Add runtime ramdisk patch support
parent
4229ba36
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1 changed file
with
45 additions
and
0 deletions
+45
-0
magiskinit.c
jni/magiskinit.c
+45
-0
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jni/magiskinit.c
View file @
ff7c38f8
...
@@ -6,6 +6,7 @@
...
@@ -6,6 +6,7 @@
#include <sys/stat.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/types.h>
#include <sys/mount.h>
#include <sys/mount.h>
#include <sys/mman.h>
#include <sys/sendfile.h>
#include <sys/sendfile.h>
#include <sys/sysmacros.h>
#include <sys/sysmacros.h>
...
@@ -22,6 +23,22 @@ struct device {
...
@@ -22,6 +23,22 @@ struct device {
char
path
[
64
];
char
path
[
64
];
};
};
static
void
mmap_ro
(
const
char
*
filename
,
void
**
buf
,
size_t
*
size
)
{
int
fd
=
open
(
filename
,
O_RDONLY
);
*
size
=
lseek
(
fd
,
0
,
SEEK_END
);
lseek
(
fd
,
0
,
SEEK_SET
);
*
buf
=
mmap
(
NULL
,
*
size
,
PROT_READ
,
MAP_SHARED
,
fd
,
0
);
close
(
fd
);
}
static
void
mmap_rw
(
const
char
*
filename
,
void
**
buf
,
size_t
*
size
)
{
int
fd
=
open
(
filename
,
O_RDWR
);
*
size
=
lseek
(
fd
,
0
,
SEEK_END
);
lseek
(
fd
,
0
,
SEEK_SET
);
*
buf
=
mmap
(
NULL
,
*
size
,
PROT_READ
|
PROT_WRITE
,
MAP_SHARED
,
fd
,
0
);
close
(
fd
);
}
static
void
clone_dir
(
int
src
,
int
dest
)
{
static
void
clone_dir
(
int
src
,
int
dest
)
{
struct
dirent
*
entry
;
struct
dirent
*
entry
;
DIR
*
dir
;
DIR
*
dir
;
...
@@ -206,6 +223,32 @@ static int setup_block(struct device *dev, const char *partname) {
...
@@ -206,6 +223,32 @@ static int setup_block(struct device *dev, const char *partname) {
return
0
;
return
0
;
}
}
static
void
patch_ramdisk
()
{
void
*
addr
;
size_t
size
;
mmap_rw
(
"/init"
,
&
addr
,
&
size
);
for
(
int
i
=
0
;
i
<
size
;
++
i
)
{
if
(
memcmp
(
addr
+
i
,
"/system/etc/selinux/plat_sepolicy.cil"
,
37
)
==
0
)
{
memcpy
(
addr
+
i
,
"/system/etc/selinux/plat_sepolicy.xxx"
,
37
);
break
;
}
}
munmap
(
addr
,
size
);
mmap_ro
(
"/init.rc"
,
&
addr
,
&
size
);
int
fd
=
open
(
"/init.rc.patch"
,
O_WRONLY
|
O_CREAT
|
O_CLOEXEC
,
0750
);
for
(
int
i
=
0
;
i
<
size
;
++
i
)
{
if
(
memcmp
(
addr
+
i
,
"import"
,
6
)
==
0
)
{
write
(
fd
,
addr
,
i
);
write
(
fd
,
"import /init.magisk.rc
\n
"
,
23
);
write
(
fd
,
addr
+
i
,
size
-
i
);
close
(
fd
);
break
;
}
}
munmap
(
addr
,
size
);
rename
(
"/init.rc.patch"
,
"/init.rc"
);
}
int
main
(
int
argc
,
char
*
argv
[])
{
int
main
(
int
argc
,
char
*
argv
[])
{
umask
(
0
);
umask
(
0
);
...
@@ -234,6 +277,8 @@ int main(int argc, char *argv[]) {
...
@@ -234,6 +277,8 @@ int main(int argc, char *argv[]) {
if
(
overlay
>
0
)
if
(
overlay
>
0
)
mv_dir
(
overlay
,
root
);
mv_dir
(
overlay
,
root
);
patch_ramdisk
();
close
(
root
);
close
(
root
);
close
(
system_root
);
close
(
system_root
);
close
(
overlay
);
close
(
overlay
);
...
...
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