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Administrator
Magisk
Commits
4cdd66ce
Commit
4cdd66ce
authored
Nov 08, 2018
by
topjohnwu
Browse files
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Plain Diff
Fix lowmemorykiller crash hell in Pixel 3
parent
d3947d2c
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Showing
1 changed file
with
54 additions
and
55 deletions
+54
-55
init.cpp
native/jni/misc/init.cpp
+54
-55
No files found.
native/jni/misc/init.cpp
View file @
4cdd66ce
...
@@ -20,7 +20,6 @@
...
@@ -20,7 +20,6 @@
* preserved as it also provides CLI for sepolicy patching (magiskpolicy)
* preserved as it also provides CLI for sepolicy patching (magiskpolicy)
*/
*/
#include <stdio.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdlib.h>
#include <unistd.h>
#include <unistd.h>
...
@@ -50,6 +49,10 @@
...
@@ -50,6 +49,10 @@
int
(
*
init_applet_main
[])
(
int
,
char
*
[])
=
{
magiskpolicy_main
,
magiskpolicy_main
,
nullptr
};
int
(
*
init_applet_main
[])
(
int
,
char
*
[])
=
{
magiskpolicy_main
,
magiskpolicy_main
,
nullptr
};
static
int
root
=
-
1
;
static
bool
mnt_system
=
false
;
static
bool
mnt_vendor
=
false
;
struct
cmdline
{
struct
cmdline
{
bool
skip_initramfs
;
bool
skip_initramfs
;
char
slot
[
3
];
char
slot
[
3
];
...
@@ -110,13 +113,13 @@ static void parse_device(struct device *dev, const char *uevent) {
...
@@ -110,13 +113,13 @@ static void parse_device(struct device *dev, const char *uevent) {
LOGD
(
"%s [%s] (%u, %u)
\n
"
,
dev
->
devname
,
dev
->
partname
,
(
unsigned
)
dev
->
major
,
(
unsigned
)
dev
->
minor
);
LOGD
(
"%s [%s] (%u, %u)
\n
"
,
dev
->
devname
,
dev
->
partname
,
(
unsigned
)
dev
->
major
,
(
unsigned
)
dev
->
minor
);
}
}
static
int
setup_block
(
struct
device
*
dev
,
const
char
*
partname
)
{
static
bool
setup_block
(
struct
device
*
dev
,
const
char
*
partname
)
{
char
path
[
128
];
char
path
[
128
];
struct
dirent
*
entry
;
struct
dirent
*
entry
;
DIR
*
dir
=
opendir
(
"/sys/dev/block"
);
DIR
*
dir
=
opendir
(
"/sys/dev/block"
);
if
(
dir
==
nullptr
)
if
(
dir
==
nullptr
)
return
1
;
return
1
;
int
found
=
0
;
bool
found
=
false
;
while
((
entry
=
readdir
(
dir
)))
{
while
((
entry
=
readdir
(
dir
)))
{
if
(
strcmp
(
entry
->
d_name
,
"."
)
==
0
||
strcmp
(
entry
->
d_name
,
".."
)
==
0
)
if
(
strcmp
(
entry
->
d_name
,
"."
)
==
0
||
strcmp
(
entry
->
d_name
,
".."
)
==
0
)
continue
;
continue
;
...
@@ -124,29 +127,29 @@ static int setup_block(struct device *dev, const char *partname) {
...
@@ -124,29 +127,29 @@ static int setup_block(struct device *dev, const char *partname) {
parse_device
(
dev
,
path
);
parse_device
(
dev
,
path
);
if
(
strcasecmp
(
dev
->
partname
,
partname
)
==
0
)
{
if
(
strcasecmp
(
dev
->
partname
,
partname
)
==
0
)
{
sprintf
(
dev
->
path
,
"/dev/block/%s"
,
dev
->
devname
);
sprintf
(
dev
->
path
,
"/dev/block/%s"
,
dev
->
devname
);
found
=
1
;
found
=
true
;
break
;
break
;
}
}
}
}
closedir
(
dir
);
closedir
(
dir
);
if
(
!
found
)
if
(
!
found
)
return
1
;
return
false
;
mkdir
(
"/dev"
,
0755
);
mkdir
(
"/dev"
,
0755
);
mkdir
(
"/dev/block"
,
0755
);
mkdir
(
"/dev/block"
,
0755
);
mknod
(
dev
->
path
,
S_IFBLK
|
0600
,
makedev
(
dev
->
major
,
dev
->
minor
));
mknod
(
dev
->
path
,
S_IFBLK
|
0600
,
makedev
(
dev
->
major
,
dev
->
minor
));
return
0
;
return
true
;
}
}
static
int
read_fstab_dt
(
const
struct
cmdline
*
cmd
,
const
char
*
mnt_point
,
char
*
partname
)
{
static
bool
read_fstab_dt
(
const
struct
cmdline
*
cmd
,
const
char
*
mnt_point
,
char
*
partname
)
{
char
buf
[
128
];
char
buf
[
128
];
struct
stat
st
;
struct
stat
st
;
sprintf
(
buf
,
"/%s"
,
mnt_point
);
sprintf
(
buf
,
"/%s"
,
mnt_point
);
lstat
(
buf
,
&
st
);
lstat
(
buf
,
&
st
);
// Don't early mount if the mount point is symlink
// Don't early mount if the mount point is symlink
if
(
S_ISLNK
(
st
.
st_mode
))
if
(
S_ISLNK
(
st
.
st_mode
))
return
1
;
return
false
;
sprintf
(
buf
,
"%s/fstab/%s/dev"
,
cmd
->
dt_dir
,
mnt_point
);
sprintf
(
buf
,
"%s/fstab/%s/dev"
,
cmd
->
dt_dir
,
mnt_point
);
if
(
access
(
buf
,
F_OK
)
==
0
)
{
if
(
access
(
buf
,
F_OK
)
==
0
)
{
int
fd
=
open
(
buf
,
O_RDONLY
|
O_CLOEXEC
);
int
fd
=
open
(
buf
,
O_RDONLY
|
O_CLOEXEC
);
...
@@ -154,12 +157,12 @@ static int read_fstab_dt(const struct cmdline *cmd, const char *mnt_point, char
...
@@ -154,12 +157,12 @@ static int read_fstab_dt(const struct cmdline *cmd, const char *mnt_point, char
close
(
fd
);
close
(
fd
);
char
*
name
=
strrchr
(
buf
,
'/'
)
+
1
;
char
*
name
=
strrchr
(
buf
,
'/'
)
+
1
;
sprintf
(
partname
,
"%s%s"
,
name
,
strend
(
name
,
cmd
->
slot
)
?
cmd
->
slot
:
""
);
sprintf
(
partname
,
"%s%s"
,
name
,
strend
(
name
,
cmd
->
slot
)
?
cmd
->
slot
:
""
);
return
0
;
return
true
;
}
}
return
1
;
return
false
;
}
}
static
int
verify_precompiled
()
{
static
bool
verify_precompiled
()
{
DIR
*
dir
;
DIR
*
dir
;
struct
dirent
*
entry
;
struct
dirent
*
entry
;
int
fd
;
int
fd
;
...
@@ -197,18 +200,18 @@ static int verify_precompiled() {
...
@@ -197,18 +200,18 @@ static int verify_precompiled() {
return
memcmp
(
sys_sha
,
ven_sha
,
sizeof
(
sys_sha
))
==
0
;
return
memcmp
(
sys_sha
,
ven_sha
,
sizeof
(
sys_sha
))
==
0
;
}
}
static
int
patch_sepolicy
()
{
static
bool
patch_sepolicy
()
{
int
init_patch
=
0
;
bool
init_patch
=
false
;
if
(
access
(
SPLIT_PRECOMPILE
,
R_OK
)
==
0
&&
verify_precompiled
())
{
if
(
access
(
SPLIT_PRECOMPILE
,
R_OK
)
==
0
&&
verify_precompiled
())
{
init_patch
=
1
;
init_patch
=
true
;
load_policydb
(
SPLIT_PRECOMPILE
);
load_policydb
(
SPLIT_PRECOMPILE
);
}
else
if
(
access
(
SPLIT_PLAT_CIL
,
R_OK
)
==
0
)
{
}
else
if
(
access
(
SPLIT_PLAT_CIL
,
R_OK
)
==
0
)
{
init_patch
=
1
;
init_patch
=
true
;
compile_split_cil
();
compile_split_cil
();
}
else
if
(
access
(
"/sepolicy"
,
R_OK
)
==
0
)
{
}
else
if
(
access
(
"/sepolicy"
,
R_OK
)
==
0
)
{
load_policydb
(
"/sepolicy"
);
load_policydb
(
"/sepolicy"
);
}
else
{
}
else
{
return
1
;
return
false
;
}
}
sepol_magisk_rules
();
sepol_magisk_rules
();
...
@@ -235,10 +238,10 @@ static int patch_sepolicy() {
...
@@ -235,10 +238,10 @@ static int patch_sepolicy() {
munmap
(
addr
,
size
);
munmap
(
addr
,
size
);
}
}
return
0
;
return
true
;
}
}
static
int
unxz
(
int
fd
,
const
uint8_t
*
buf
,
size_t
size
)
{
static
bool
unxz
(
int
fd
,
const
uint8_t
*
buf
,
size_t
size
)
{
uint8_t
out
[
8192
];
uint8_t
out
[
8192
];
xz_crc32_init
();
xz_crc32_init
();
struct
xz_dec
*
dec
=
xz_dec_init
(
XZ_DYNALLOC
,
1
<<
26
);
struct
xz_dec
*
dec
=
xz_dec_init
(
XZ_DYNALLOC
,
1
<<
26
);
...
@@ -254,18 +257,18 @@ static int unxz(int fd, const uint8_t *buf, size_t size) {
...
@@ -254,18 +257,18 @@ static int unxz(int fd, const uint8_t *buf, size_t size) {
do
{
do
{
ret
=
xz_dec_run
(
dec
,
&
b
);
ret
=
xz_dec_run
(
dec
,
&
b
);
if
(
ret
!=
XZ_OK
&&
ret
!=
XZ_STREAM_END
)
if
(
ret
!=
XZ_OK
&&
ret
!=
XZ_STREAM_END
)
return
1
;
return
false
;
write
(
fd
,
out
,
b
.
out_pos
);
write
(
fd
,
out
,
b
.
out_pos
);
b
.
out_pos
=
0
;
b
.
out_pos
=
0
;
}
while
(
b
.
in_pos
!=
size
);
}
while
(
b
.
in_pos
!=
size
);
return
0
;
return
true
;
}
}
static
int
dump_magisk
(
const
char
*
path
,
mode_t
mode
)
{
static
int
dump_magisk
(
const
char
*
path
,
mode_t
mode
)
{
int
fd
=
creat
(
path
,
mode
);
int
fd
=
creat
(
path
,
mode
);
if
(
fd
<
0
)
if
(
fd
<
0
)
return
1
;
return
1
;
if
(
unxz
(
fd
,
magisk_xz
,
sizeof
(
magisk_xz
)))
if
(
!
unxz
(
fd
,
magisk_xz
,
sizeof
(
magisk_xz
)))
return
1
;
return
1
;
close
(
fd
);
close
(
fd
);
return
0
;
return
0
;
...
@@ -275,7 +278,7 @@ static int dump_manager(const char *path, mode_t mode) {
...
@@ -275,7 +278,7 @@ static int dump_manager(const char *path, mode_t mode) {
int
fd
=
creat
(
path
,
mode
);
int
fd
=
creat
(
path
,
mode
);
if
(
fd
<
0
)
if
(
fd
<
0
)
return
1
;
return
1
;
if
(
unxz
(
fd
,
manager_xz
,
sizeof
(
manager_xz
)))
if
(
!
unxz
(
fd
,
manager_xz
,
sizeof
(
manager_xz
)))
return
1
;
return
1
;
close
(
fd
);
close
(
fd
);
return
0
;
return
0
;
...
@@ -316,6 +319,19 @@ static void patch_socket_name(const char *path) {
...
@@ -316,6 +319,19 @@ static void patch_socket_name(const char *path) {
munmap
(
buf
,
size
);
munmap
(
buf
,
size
);
}
}
static
void
exec_init
(
char
*
argv
[])
{
// Clean up
close
(
root
);
umount
(
"/proc"
);
umount
(
"/sys"
);
if
(
mnt_system
)
umount
(
"/system"
);
if
(
mnt_vendor
)
umount
(
"/vendor"
);
execv
(
"/init"
,
argv
);
}
int
main
(
int
argc
,
char
*
argv
[])
{
int
main
(
int
argc
,
char
*
argv
[])
{
umask
(
0
);
umask
(
0
);
...
@@ -359,9 +375,7 @@ int main(int argc, char *argv[]) {
...
@@ -359,9 +375,7 @@ int main(int argc, char *argv[]) {
* Initialize
* Initialize
* ***********/
* ***********/
int
root
=
open
(
"/"
,
O_RDONLY
|
O_CLOEXEC
);
root
=
open
(
"/"
,
O_RDONLY
|
O_CLOEXEC
);
bool
mnt_system
=
false
;
bool
mnt_vendor
=
false
;
if
(
cmd
.
skip_initramfs
)
{
if
(
cmd
.
skip_initramfs
)
{
// Clear rootfs
// Clear rootfs
...
@@ -378,7 +392,7 @@ int main(int argc, char *argv[]) {
...
@@ -378,7 +392,7 @@ int main(int argc, char *argv[]) {
if
(
!
cmd
.
skip_initramfs
&&
access
(
"/sbin/recovery"
,
F_OK
)
==
0
)
{
if
(
!
cmd
.
skip_initramfs
&&
access
(
"/sbin/recovery"
,
F_OK
)
==
0
)
{
// Remove Magisk traces
// Remove Magisk traces
rm_rf
(
"/.backup"
);
rm_rf
(
"/.backup"
);
goto
exec_init
;
exec_init
(
argv
)
;
}
}
/* ************
/* ************
...
@@ -396,21 +410,21 @@ int main(int argc, char *argv[]) {
...
@@ -396,21 +410,21 @@ int main(int argc, char *argv[]) {
int
system_root
=
open
(
"/system_root"
,
O_RDONLY
|
O_CLOEXEC
);
int
system_root
=
open
(
"/system_root"
,
O_RDONLY
|
O_CLOEXEC
);
// Clone rootfs except /system
// Clone rootfs except /system
const
char
*
excl
[]
=
{
"
overlay"
,
".backup"
,
"proc"
,
"sys"
,
"init.bak
"
,
nullptr
};
const
char
*
excl
[]
=
{
"
system
"
,
nullptr
};
excl_list
=
excl
;
excl_list
=
excl
;
clone_dir
(
system_root
,
root
);
clone_dir
(
system_root
,
root
);
excl_list
=
nullptr
;
close
(
system_root
);
close
(
system_root
);
excl_list
=
nullptr
;
xmkdir
(
"/system"
,
0755
);
xmkdir
(
"/system"
,
0755
);
xmount
(
"/system_root/system"
,
"/system"
,
nullptr
,
MS_BIND
,
nullptr
);
xmount
(
"/system_root/system"
,
"/system"
,
nullptr
,
MS_BIND
,
nullptr
);
}
else
if
(
read_fstab_dt
(
&
cmd
,
"system"
,
partname
)
==
0
)
{
}
else
if
(
read_fstab_dt
(
&
cmd
,
"system"
,
partname
))
{
setup_block
(
&
dev
,
partname
);
setup_block
(
&
dev
,
partname
);
xmount
(
dev
.
path
,
"/system"
,
"ext4"
,
MS_RDONLY
,
nullptr
);
xmount
(
dev
.
path
,
"/system"
,
"ext4"
,
MS_RDONLY
,
nullptr
);
mnt_system
=
true
;
mnt_system
=
true
;
}
}
if
(
read_fstab_dt
(
&
cmd
,
"vendor"
,
partname
)
==
0
)
{
if
(
read_fstab_dt
(
&
cmd
,
"vendor"
,
partname
))
{
setup_block
(
&
dev
,
partname
);
setup_block
(
&
dev
,
partname
);
xmount
(
dev
.
path
,
"/vendor"
,
"ext4"
,
MS_RDONLY
,
nullptr
);
xmount
(
dev
.
path
,
"/vendor"
,
"ext4"
,
MS_RDONLY
,
nullptr
);
mnt_vendor
=
true
;
mnt_vendor
=
true
;
...
@@ -420,13 +434,8 @@ int main(int argc, char *argv[]) {
...
@@ -420,13 +434,8 @@ int main(int argc, char *argv[]) {
* Ramdisk Patches
* Ramdisk Patches
* ****************/
* ****************/
int
fd
;
bool
injected
;
FILE
*
fp
;
char
tok
[
4096
];
// Handle ramdisk overlays
// Handle ramdisk overlays
fd
=
open
(
"/overlay"
,
O_RDONLY
|
O_CLOEXEC
);
int
fd
=
open
(
"/overlay"
,
O_RDONLY
|
O_CLOEXEC
);
if
(
fd
>=
0
)
{
if
(
fd
>=
0
)
{
mv_dir
(
fd
,
root
);
mv_dir
(
fd
,
root
);
close
(
fd
);
close
(
fd
);
...
@@ -434,23 +443,23 @@ int main(int argc, char *argv[]) {
...
@@ -434,23 +443,23 @@ int main(int argc, char *argv[]) {
}
}
// Patch init.rc to load magisk scripts
// Patch init.rc to load magisk scripts
bool
injected
=
false
;
injected
=
false
;
char
line
[
4096
]
;
fp
=
xfopen
(
"/init.rc"
,
"r"
);
FILE
*
fp
=
xfopen
(
"/init.rc"
,
"r"
);
fd
=
creat
(
"/init.rc.new"
,
0750
);
fd
=
creat
(
"/init.rc.new"
,
0750
);
while
(
fgets
(
tok
,
sizeof
(
tok
),
fp
))
{
while
(
fgets
(
line
,
sizeof
(
line
),
fp
))
{
if
(
!
injected
&&
strncmp
(
tok
,
"import"
,
6
)
==
0
)
{
if
(
!
injected
&&
strncmp
(
line
,
"import"
,
6
)
==
0
)
{
if
(
strstr
(
tok
,
"init.magisk.rc"
))
{
if
(
strstr
(
line
,
"init.magisk.rc"
))
{
injected
=
true
;
injected
=
true
;
}
else
{
}
else
{
xwrite
(
fd
,
"import /init.magisk.rc
\n
"
,
23
);
xwrite
(
fd
,
"import /init.magisk.rc
\n
"
,
23
);
injected
=
true
;
injected
=
true
;
}
}
}
else
if
(
strstr
(
tok
,
"selinux.reload_policy"
))
{
}
else
if
(
strstr
(
line
,
"selinux.reload_policy"
))
{
// Do not allow sepolicy patch
// Do not allow sepolicy patch
continue
;
continue
;
}
}
xwrite
(
fd
,
tok
,
strlen
(
tok
));
xwrite
(
fd
,
line
,
strlen
(
line
));
}
}
fclose
(
fp
);
fclose
(
fp
);
close
(
fd
);
close
(
fd
);
...
@@ -465,15 +474,5 @@ int main(int argc, char *argv[]) {
...
@@ -465,15 +474,5 @@ int main(int argc, char *argv[]) {
patch_socket_name
(
"/sbin/magisk"
);
patch_socket_name
(
"/sbin/magisk"
);
rename
(
"/init.bak"
,
"/sbin/magiskinit"
);
rename
(
"/init.bak"
,
"/sbin/magiskinit"
);
exec_init:
exec_init
(
argv
);
// Clean up
close
(
root
);
umount
(
"/proc"
);
umount
(
"/sys"
);
if
(
mnt_system
)
umount
(
"/system"
);
if
(
mnt_vendor
)
umount
(
"/vendor"
);
execv
(
"/init"
,
argv
);
}
}
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