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-rw-r--r--libs/binder/Binder.cpp62
-rw-r--r--libs/binder/IPCThreadState.cpp34
-rw-r--r--libs/binder/Parcel.cpp5
-rw-r--r--libs/binder/ProcessState.cpp16
-rw-r--r--libs/binder/include/binder/Binder.h6
-rw-r--r--libs/binder/include/binder/IPCThreadState.h7
-rw-r--r--libs/binder/include/binder/Parcel.h3
7 files changed, 110 insertions, 23 deletions
diff --git a/libs/binder/Binder.cpp b/libs/binder/Binder.cpp
index f6cc3afc97..96ee29556c 100644
--- a/libs/binder/Binder.cpp
+++ b/libs/binder/Binder.cpp
@@ -86,6 +86,10 @@ status_t IBinder::shellCommand(const sp<IBinder>& target, int in, int out, int e
class BBinder::Extras
{
public:
+ // unlocked objects
+ bool mRequestingSid = false;
+
+ // for below objects
Mutex mLock;
BpBinder::ObjectManager mObjects;
};
@@ -163,19 +167,8 @@ void BBinder::attachObject(
const void* objectID, void* object, void* cleanupCookie,
object_cleanup_func func)
{
- Extras* e = mExtras.load(std::memory_order_acquire);
-
- if (!e) {
- e = new Extras;
- Extras* expected = nullptr;
- if (!mExtras.compare_exchange_strong(expected, e,
- std::memory_order_release,
- std::memory_order_acquire)) {
- delete e;
- e = expected; // Filled in by CAS
- }
- if (e == nullptr) return; // out of memory
- }
+ Extras* e = getOrCreateExtras();
+ if (!e) return; // out of memory
AutoMutex _l(e->mLock);
e->mObjects.attach(objectID, object, cleanupCookie, func);
@@ -204,6 +197,30 @@ BBinder* BBinder::localBinder()
return this;
}
+bool BBinder::isRequestingSid()
+{
+ Extras* e = mExtras.load(std::memory_order_acquire);
+
+ return e && e->mRequestingSid;
+}
+
+void BBinder::setRequestingSid(bool requestingSid)
+{
+ Extras* e = mExtras.load(std::memory_order_acquire);
+
+ if (!e) {
+ // default is false. Most things don't need sids, so avoiding allocations when possible.
+ if (!requestingSid) {
+ return;
+ }
+
+ e = getOrCreateExtras();
+ if (!e) return; // out of memory
+ }
+
+ e->mRequestingSid = true;
+}
+
BBinder::~BBinder()
{
Extras* e = mExtras.load(std::memory_order_relaxed);
@@ -267,6 +284,25 @@ status_t BBinder::onTransact(
}
}
+BBinder::Extras* BBinder::getOrCreateExtras()
+{
+ Extras* e = mExtras.load(std::memory_order_acquire);
+
+ if (!e) {
+ e = new Extras;
+ Extras* expected = nullptr;
+ if (!mExtras.compare_exchange_strong(expected, e,
+ std::memory_order_release,
+ std::memory_order_acquire)) {
+ delete e;
+ e = expected; // Filled in by CAS
+ }
+ if (e == nullptr) return nullptr; // out of memory
+ }
+
+ return e;
+}
+
// ---------------------------------------------------------------------------
enum {
diff --git a/libs/binder/IPCThreadState.cpp b/libs/binder/IPCThreadState.cpp
index 22f6f54e28..e60f03ae54 100644
--- a/libs/binder/IPCThreadState.cpp
+++ b/libs/binder/IPCThreadState.cpp
@@ -88,7 +88,8 @@ static const char *kReturnStrings[] = {
"BR_FINISHED",
"BR_DEAD_BINDER",
"BR_CLEAR_DEATH_NOTIFICATION_DONE",
- "BR_FAILED_REPLY"
+ "BR_FAILED_REPLY",
+ "BR_TRANSACTION_SEC_CTX",
};
static const char *kCommandStrings[] = {
@@ -363,6 +364,11 @@ pid_t IPCThreadState::getCallingPid() const
return mCallingPid;
}
+const char* IPCThreadState::getCallingSid() const
+{
+ return mCallingSid;
+}
+
uid_t IPCThreadState::getCallingUid() const
{
return mCallingUid;
@@ -370,6 +376,7 @@ uid_t IPCThreadState::getCallingUid() const
int64_t IPCThreadState::clearCallingIdentity()
{
+ // ignore mCallingSid for legacy reasons
int64_t token = ((int64_t)mCallingUid<<32) | mCallingPid;
clearCaller();
return token;
@@ -398,12 +405,14 @@ int32_t IPCThreadState::getLastTransactionBinderFlags() const
void IPCThreadState::restoreCallingIdentity(int64_t token)
{
mCallingUid = (int)(token>>32);
+ mCallingSid = nullptr; // not enough data to restore
mCallingPid = (int)token;
}
void IPCThreadState::clearCaller()
{
mCallingPid = getpid();
+ mCallingSid = nullptr; // expensive to lookup
mCallingUid = getuid();
}
@@ -1089,10 +1098,19 @@ status_t IPCThreadState::executeCommand(int32_t cmd)
}
break;
+ case BR_TRANSACTION_SEC_CTX:
case BR_TRANSACTION:
{
- binder_transaction_data tr;
- result = mIn.read(&tr, sizeof(tr));
+ binder_transaction_data_secctx tr_secctx;
+ binder_transaction_data& tr = tr_secctx.transaction_data;
+
+ if (cmd == (int) BR_TRANSACTION_SEC_CTX) {
+ result = mIn.read(&tr_secctx, sizeof(tr_secctx));
+ } else {
+ result = mIn.read(&tr, sizeof(tr));
+ tr_secctx.secctx = 0;
+ }
+
ALOG_ASSERT(result == NO_ERROR,
"Not enough command data for brTRANSACTION");
if (result != NO_ERROR) break;
@@ -1108,15 +1126,18 @@ status_t IPCThreadState::executeCommand(int32_t cmd)
tr.offsets_size/sizeof(binder_size_t), freeBuffer, this);
const pid_t origPid = mCallingPid;
+ const char* origSid = mCallingSid;
const uid_t origUid = mCallingUid;
const int32_t origStrictModePolicy = mStrictModePolicy;
const int32_t origTransactionBinderFlags = mLastTransactionBinderFlags;
mCallingPid = tr.sender_pid;
+ mCallingSid = reinterpret_cast<const char*>(tr_secctx.secctx);
mCallingUid = tr.sender_euid;
mLastTransactionBinderFlags = tr.flags;
- //ALOGI(">>>> TRANSACT from pid %d uid %d\n", mCallingPid, mCallingUid);
+ // ALOGI(">>>> TRANSACT from pid %d sid %s uid %d\n", mCallingPid,
+ // (mCallingSid ? mCallingSid : "<N/A>"), mCallingUid);
Parcel reply;
status_t error;
@@ -1148,8 +1169,8 @@ status_t IPCThreadState::executeCommand(int32_t cmd)
}
mIPCThreadStateBase->popCurrentState();
- //ALOGI("<<<< TRANSACT from pid %d restore pid %d uid %d\n",
- // mCallingPid, origPid, origUid);
+ //ALOGI("<<<< TRANSACT from pid %d restore pid %d sid %s uid %d\n",
+ // mCallingPid, origPid, (origSid ? origSid : "<N/A>"), origUid);
if ((tr.flags & TF_ONE_WAY) == 0) {
LOG_ONEWAY("Sending reply to %d!", mCallingPid);
@@ -1160,6 +1181,7 @@ status_t IPCThreadState::executeCommand(int32_t cmd)
}
mCallingPid = origPid;
+ mCallingSid = origSid;
mCallingUid = origUid;
mStrictModePolicy = origStrictModePolicy;
mLastTransactionBinderFlags = origTransactionBinderFlags;
diff --git a/libs/binder/Parcel.cpp b/libs/binder/Parcel.cpp
index ca6a97debb..9f8c40876e 100644
--- a/libs/binder/Parcel.cpp
+++ b/libs/binder/Parcel.cpp
@@ -215,7 +215,7 @@ status_t flatten_binder(const sp<ProcessState>& /*proc*/,
}
if (binder != nullptr) {
- IBinder *local = binder->localBinder();
+ BBinder *local = binder->localBinder();
if (!local) {
BpBinder *proxy = binder->remoteBinder();
if (proxy == nullptr) {
@@ -227,6 +227,9 @@ status_t flatten_binder(const sp<ProcessState>& /*proc*/,
obj.handle = handle;
obj.cookie = 0;
} else {
+ if (local->isRequestingSid()) {
+ obj.flags |= FLAT_BINDER_FLAG_TXN_SECURITY_CTX;
+ }
obj.hdr.type = BINDER_TYPE_BINDER;
obj.binder = reinterpret_cast<uintptr_t>(local->getWeakRefs());
obj.cookie = reinterpret_cast<uintptr_t>(local);
diff --git a/libs/binder/ProcessState.cpp b/libs/binder/ProcessState.cpp
index 1c74e7b077..63f49ddba7 100644
--- a/libs/binder/ProcessState.cpp
+++ b/libs/binder/ProcessState.cpp
@@ -181,8 +181,20 @@ bool ProcessState::becomeContextManager(context_check_func checkFunc, void* user
mBinderContextCheckFunc = checkFunc;
mBinderContextUserData = userData;
- int dummy = 0;
- status_t result = ioctl(mDriverFD, BINDER_SET_CONTEXT_MGR, &dummy);
+ flat_binder_object obj {
+ .flags = FLAT_BINDER_FLAG_TXN_SECURITY_CTX,
+ };
+
+ status_t result = ioctl(mDriverFD, BINDER_SET_CONTEXT_MGR_EXT, &obj);
+
+ // fallback to original method
+ if (result != 0) {
+ android_errorWriteLog(0x534e4554, "121035042");
+
+ int dummy = 0;
+ result = ioctl(mDriverFD, BINDER_SET_CONTEXT_MGR, &dummy);
+ }
+
if (result == 0) {
mManagesContexts = true;
} else if (result == -1) {
diff --git a/libs/binder/include/binder/Binder.h b/libs/binder/include/binder/Binder.h
index c251468bdb..cf3ef84caa 100644
--- a/libs/binder/include/binder/Binder.h
+++ b/libs/binder/include/binder/Binder.h
@@ -60,6 +60,10 @@ public:
virtual BBinder* localBinder();
+ bool isRequestingSid();
+ // This must be called before the object is sent to another process. Not thread safe.
+ void setRequestingSid(bool requestSid);
+
protected:
virtual ~BBinder();
@@ -75,6 +79,8 @@ private:
class Extras;
+ Extras* getOrCreateExtras();
+
std::atomic<Extras*> mExtras;
void* mReserved0;
};
diff --git a/libs/binder/include/binder/IPCThreadState.h b/libs/binder/include/binder/IPCThreadState.h
index 745f6182f6..a20ef7c410 100644
--- a/libs/binder/include/binder/IPCThreadState.h
+++ b/libs/binder/include/binder/IPCThreadState.h
@@ -42,6 +42,11 @@ public:
status_t clearLastError();
pid_t getCallingPid() const;
+ // nullptr if unavailable
+ //
+ // this can't be restored once it's cleared, and it does not return the
+ // context of the current process when not in a binder call.
+ const char* getCallingSid() const;
uid_t getCallingUid() const;
void setStrictModePolicy(int32_t policy);
@@ -51,6 +56,7 @@ public:
int32_t getLastTransactionBinderFlags() const;
int64_t clearCallingIdentity();
+ // Restores PID/UID (not SID)
void restoreCallingIdentity(int64_t token);
int setupPolling(int* fd);
@@ -154,6 +160,7 @@ private:
Parcel mOut;
status_t mLastError;
pid_t mCallingPid;
+ const char* mCallingSid;
uid_t mCallingUid;
int32_t mStrictModePolicy;
int32_t mLastTransactionBinderFlags;
diff --git a/libs/binder/include/binder/Parcel.h b/libs/binder/include/binder/Parcel.h
index c9c273acd8..f6560a7f09 100644
--- a/libs/binder/include/binder/Parcel.h
+++ b/libs/binder/include/binder/Parcel.h
@@ -20,6 +20,8 @@
#include <string>
#include <vector>
+#include <linux/android/binder.h>
+
#include <android-base/unique_fd.h>
#include <cutils/native_handle.h>
#include <utils/Errors.h>
@@ -27,7 +29,6 @@
#include <utils/String16.h>
#include <utils/Vector.h>
#include <utils/Flattenable.h>
-#include <linux/android/binder.h>
#include <binder/IInterface.h>
#include <binder/Parcelable.h>
generated by cgit v1.2.3-59-g8ed1b (git 2.39.0) at 2025-10-31 19:56:08 +0000