RK android14 第三方app获取su权限
需要修改的地方如下
frameworks/base/core/jni/com_android_internal_os_Zygote.cpp
kernel-6.1/security/commoncap.c
system/core/init/selinux.cpp
system/core/libcutils/fs_config.cpp
system/extras/su/su.cpp
device/rockchip/common/BoardConfig.mk
device/rockchip/common/sepolicy/vendor/untrusted_app.te
system/sepolicy/prebuilts/api/34.0/public/app.te
system/sepolicy/prebuilts/api/34.0/public/domain.te
system/sepolicy/public/app.te
system/sepolicy/public/domain.teframeworks/base
diff --git a/core/jni/com_android_internal_os_Zygote.cpp b/core/jni/com_android_internal_os_Zygote.cpp
index 56066b2d813c..0c587a2c0580 100644
--- a/core/jni/com_android_internal_os_Zygote.cpp
+++ b/core/jni/com_android_internal_os_Zygote.cpp
@@ -666,7 +666,7 @@ static void EnableKeepCapabilities(fail_fn_t fail_fn) {
}
static void DropCapabilitiesBoundingSet(fail_fn_t fail_fn) {
- for (int i = 0; prctl(PR_CAPBSET_READ, i, 0, 0, 0) >= 0; i++) {;
+ /* for (int i = 0; prctl(PR_CAPBSET_READ, i, 0, 0, 0) >= 0; i++) {;
if (prctl(PR_CAPBSET_DROP, i, 0, 0, 0) == -1) {
if (errno == EINVAL) {
ALOGE("prctl(PR_CAPBSET_DROP) failed with EINVAL. Please verify "
@@ -675,7 +675,7 @@ static void DropCapabilitiesBoundingSet(fail_fn_t fail_fn) {
fail_fn(CREATE_ERROR("prctl(PR_CAPBSET_DROP, %d) failed: %s", i, strerror(errno)));
}
}
- }
+ }*/
}
static void SetInheritable(uint64_t inheritable, fail_fn_t fail_fn) {
kernel-6.1
diff --git a/security/commoncap.c b/security/commoncap.c
index bc751fa5adad..bad53a9b8ac0 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -1243,11 +1243,11 @@ static int cap_prctl_drop(unsigned long cap)
{
struct cred *new;
- if (!ns_capable(current_user_ns(), CAP_SETPCAP))
+ /*if (!ns_capable(current_user_ns(), CAP_SETPCAP))
return -EPERM;
if (!cap_valid(cap))
return -EINVAL;
-
+*/
new = prepare_creds();
if (!new)
return -ENOMEM;
system/core
diff --git a/libcutils/fs_config.cpp b/libcutils/fs_config.cpp
index f90a1bc3c..6fb44ec63 100644
--- a/libcutils/fs_config.cpp
+++ b/libcutils/fs_config.cpp
@@ -87,7 +87,7 @@ static const struct fs_path_config android_dirs[] = {
{ 00751, AID_ROOT, AID_SHELL, 0, "system/bin" },
{ 00755, AID_ROOT, AID_ROOT, 0, "system/etc/ppp" },
{ 00755, AID_ROOT, AID_SHELL, 0, "system/vendor" },
- { 00750, AID_ROOT, AID_SHELL, 0, "system/xbin" },
+ { 00751, AID_ROOT, AID_SHELL, 0, "system/xbin" },
{ 00751, AID_ROOT, AID_SHELL, 0, "system/apex/*/bin" },
{ 00750, AID_ROOT, AID_SYSTEM, 0, "system_ext/apex/com.android.tethering/bin/for-system" },
{ 00751, AID_ROOT, AID_SHELL, 0, "system_ext/bin" },
@@ -192,7 +192,7 @@ static const struct fs_path_config android_files[] = {
// the following two files are INTENTIONALLY set-uid, but they
// are NOT included on user builds.
{ 06755, AID_ROOT, AID_ROOT, 0, "system/xbin/procmem" },
- { 04750, AID_ROOT, AID_SHELL, 0, "system/xbin/su" },
+ { 06755, AID_ROOT, AID_SHELL, 0, "system/xbin/su" },
// the following files have enhanced capabilities and ARE included
// in user builds. diff --git a/init/selinux.cpp b/init/selinux.cpp
index 907eb80e3..1d4fe492b 100644
--- a/init/selinux.cpp
+++ b/init/selinux.cpp
@@ -102,7 +102,7 @@ namespace {
enum EnforcingStatus { SELINUX_PERMISSIVE, SELINUX_ENFORCING };
-EnforcingStatus StatusFromProperty() {
+/*EnforcingStatus StatusFromProperty() {
EnforcingStatus status = SELINUX_ENFORCING;
ImportKernelCmdline([&](const std::string& key, const std::string& value) {
@@ -120,13 +120,14 @@ EnforcingStatus StatusFromProperty() {
}
return status;
-}
+}*/
bool IsEnforcing() {
- if (ALLOW_PERMISSIVE_SELINUX) {
+return false ;
+ /*if (ALLOW_PERMISSIVE_SELINUX) {
return StatusFromProperty() == SELINUX_ENFORCING;
}
- return true;
+ return true;*/
}
// Forks, executes the provided program in the child, and waits for the completion in the parent.
system/extras
diff --git a/su/su.cpp b/su/su.cpp
index 1a1ab6bf..fb067ec8 100644
--- a/su/su.cpp
+++ b/su/su.cpp
@@ -80,8 +80,8 @@ void extract_uidgids(const char* uidgids, uid_t* uid, gid_t* gid, gid_t* gids, i
}
int main(int argc, char** argv) {
- uid_t current_uid = getuid();
- if (current_uid != AID_ROOT && current_uid != AID_SHELL) error(1, 0, "not allowed");
+ // uid_t current_uid = getuid();
+ //if (current_uid != AID_ROOT && current_uid != AID_SHELL) error(1, 0, "not allowed");
// Handle -h and --help.
++argv;
device/rockchip/common
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 52e518a..35b9f11 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -52,7 +52,7 @@ BOARD_BOOT_HEADER_VERSION ?= 2
BOARD_MKBOOTIMG_ARGS :=
BOARD_PREBUILT_DTBOIMAGE ?= $(TARGET_DEVICE_DIR)/dtbo.img
BOARD_ROCKCHIP_VIRTUAL_AB_ENABLE ?= false
-BOARD_SELINUX_ENFORCING ?= true
+BOARD_SELINUX_ENFORCING ?= false
PRODUCT_KERNEL_ARCH ?= arm
BOARD_ROCKCHIP_PKVM ?= false根据运行时log avc日志加相应的权限
diff --git a/sepolicy/vendor/untrusted_app.te b/sepolicy/vendor/untrusted_app.te
index 3868f47..bb77f57 100644
--- a/sepolicy/vendor/untrusted_app.te
+++ b/sepolicy/vendor/untrusted_app.te
@@ -3,6 +3,8 @@ allow untrusted_app ota_data_file:dir rw_dir_perms;
allow untrusted_app ota_data_file:file rw_file_perms;
allow untrusted_app userdata_block_device:blk_file { getattr };
allow untrusted_app oemfs:file {execmod};
+allow untrusted_app su_exec:file {execute read open execute_no_trans map getattr};
+allow untrusted_app untrusted_app:capability {setuid setgid };
dontaudit untrusted_app mnt_vendor_file:dir { search };
system/sepolicy
diff --git a/prebuilts/api/34.0/public/app.te b/prebuilts/api/34.0/public/app.te
index da59f3214..6cdc81c15 100644
--- a/prebuilts/api/34.0/public/app.te
+++ b/prebuilts/api/34.0/public/app.te
@@ -16,7 +16,7 @@ type appdomain_tmpfs, file_type;
# Superuser capabilities.
# bluetooth requires net_admin and wake_alarm. network stack app requires net_admin.
-neverallow { appdomain -bluetooth -network_stack } self:capability_class_set *;
+#neverallow { appdomain -bluetooth -network_stack } self:capability_class_set *;
# Block device access.
neverallow appdomain dev_type:blk_file { read write };diff --git a/prebuilts/api/34.0/public/domain.te b/prebuilts/api/34.0/public/domain.te
index 1da3f51a9..bed442f0d 100644
--- a/prebuilts/api/34.0/public/domain.te
+++ b/prebuilts/api/34.0/public/domain.te
@@ -1029,7 +1029,7 @@ neverallow * { file_type fs_type dev_type }:{ lnk_file fifo_file sock_file } mou
# Nobody should be able to execute su on user builds.
# On userdebug/eng builds, only dumpstate, shell, and
# su itself execute su.
-neverallow { domain userdebug_or_eng(`-dumpstate -shell -su') } su_exec:file no_x_file_perms;
+#neverallow { domain userdebug_or_eng(`-dumpstate -shell -su') } su_exec:file no_x_file_perms;
# Do not allow the introduction of new execmod rules. Text relocations
# and modification of executable pages are unsafe.diff --git a/public/app.te b/public/app.te
index da59f3214..6cdc81c15 100644
--- a/public/app.te
+++ b/public/app.te
@@ -16,7 +16,7 @@ type appdomain_tmpfs, file_type;
# Superuser capabilities.
# bluetooth requires net_admin and wake_alarm. network stack app requires net_admin.
-neverallow { appdomain -bluetooth -network_stack } self:capability_class_set *;
+#neverallow { appdomain -bluetooth -network_stack } self:capability_class_set *;
# Block device access.
neverallow appdomain dev_type:blk_file { read write };diff --git a/public/domain.te b/public/domain.te
index 1da3f51a9..bed442f0d 100644
--- a/public/domain.te
+++ b/public/domain.te
@@ -1029,7 +1029,7 @@ neverallow * { file_type fs_type dev_type }:{ lnk_file fifo_file sock_file } mou
# Nobody should be able to execute su on user builds.
# On userdebug/eng builds, only dumpstate, shell, and
# su itself execute su.
-neverallow { domain userdebug_or_eng(`-dumpstate -shell -su') } su_exec:file no_x_file_perms;
+#neverallow { domain userdebug_or_eng(`-dumpstate -shell -su') } su_exec:file no_x_file_perms;
# Do not allow the introduction of new execmod rules. Text relocations
# and modification of executable pages are unsafe.
测试代码如下
/**
* 判断机器Android是否已经root，即是否获取root权限
*/
private boolean haveRoot() {
// 通过执行测试命令来检测
int ret = execRootCmdSilent("echo test");
if (ret != -1) {
Log.i("test", "have root!");
return true;
} else {
Log.i("test", "not root!");
return false;
}
}
// cmd="chmod 777 /dev/ttyACM"
public int execRootCmdSilent(String cmd) {
int result = -1;
DataOutputStream dos = null;
try {
Process p = Runtime.getRuntime().exec("su");
dos = new DataOutputStream(p.getOutputStream());
Log.i("test", cmd);
dos.writeBytes(cmd + "\n");
dos.flush();
dos.writeBytes("exit\n");
dos.flush();
p.waitFor();
result = p.exitValue();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (dos != null) {
try {
dos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return result;
}原文地址：https://blog.csdn.net/m0_71008721/article/details/143693818
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