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-rw-r--r--drivers/android/binder.c27
-rw-r--r--drivers/android/binder_alloc.c15
-rw-r--r--drivers/android/binder_alloc.h8
-rw-r--r--drivers/android/binder_internal.h6
-rw-r--r--include/uapi/linux/android/binder.h8
5 files changed, 56 insertions, 8 deletions
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index be34da3dd077..63d2c4339689 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -3020,7 +3020,10 @@ static void binder_transaction(struct binder_proc *proc,
goto err_bad_object_type;
}
}
- tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
+ if (t->buffer->oneway_spam_suspect)
+ tcomplete->type = BINDER_WORK_TRANSACTION_ONEWAY_SPAM_SUSPECT;
+ else
+ tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
t->work.type = BINDER_WORK_TRANSACTION;
if (reply) {
@@ -3893,9 +3896,14 @@ retry:
binder_stat_br(proc, thread, cmd);
} break;
- case BINDER_WORK_TRANSACTION_COMPLETE: {
+ case BINDER_WORK_TRANSACTION_COMPLETE:
+ case BINDER_WORK_TRANSACTION_ONEWAY_SPAM_SUSPECT: {
+ if (proc->oneway_spam_detection_enabled &&
+ w->type == BINDER_WORK_TRANSACTION_ONEWAY_SPAM_SUSPECT)
+ cmd = BR_ONEWAY_SPAM_SUSPECT;
+ else
+ cmd = BR_TRANSACTION_COMPLETE;
binder_inner_proc_unlock(proc);
- cmd = BR_TRANSACTION_COMPLETE;
kfree(w);
binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
if (put_user(cmd, (uint32_t __user *)ptr))
@@ -4897,6 +4905,18 @@ static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
}
break;
}
+ case BINDER_ENABLE_ONEWAY_SPAM_DETECTION: {
+ uint32_t enable;
+
+ if (copy_from_user(&enable, ubuf, sizeof(enable))) {
+ ret = -EINVAL;
+ goto err;
+ }
+ binder_inner_proc_lock(proc);
+ proc->oneway_spam_detection_enabled = (bool)enable;
+ binder_inner_proc_unlock(proc);
+ break;
+ }
default:
ret = -EINVAL;
goto err;
@@ -5561,6 +5581,7 @@ static const char * const binder_return_strings[] = {
"BR_CLEAR_DEATH_NOTIFICATION_DONE",
"BR_FAILED_REPLY",
"BR_FROZEN_REPLY",
+ "BR_ONEWAY_SPAM_SUSPECT",
};
static const char * const binder_command_strings[] = {
diff --git a/drivers/android/binder_alloc.c b/drivers/android/binder_alloc.c
index 7caf74ad2405..340515f54498 100644
--- a/drivers/android/binder_alloc.c
+++ b/drivers/android/binder_alloc.c
@@ -338,7 +338,7 @@ static inline struct vm_area_struct *binder_alloc_get_vma(
return vma;
}
-static void debug_low_async_space_locked(struct binder_alloc *alloc, int pid)
+static bool debug_low_async_space_locked(struct binder_alloc *alloc, int pid)
{
/*
* Find the amount and size of buffers allocated by the current caller;
@@ -366,13 +366,19 @@ static void debug_low_async_space_locked(struct binder_alloc *alloc, int pid)
/*
* Warn if this pid has more than 50 transactions, or more than 50% of
- * async space (which is 25% of total buffer size).
+ * async space (which is 25% of total buffer size). Oneway spam is only
+ * detected when the threshold is exceeded.
*/
if (num_buffers > 50 || total_alloc_size > alloc->buffer_size / 4) {
binder_alloc_debug(BINDER_DEBUG_USER_ERROR,
"%d: pid %d spamming oneway? %zd buffers allocated for a total size of %zd\n",
alloc->pid, pid, num_buffers, total_alloc_size);
+ if (!alloc->oneway_spam_detected) {
+ alloc->oneway_spam_detected = true;
+ return true;
+ }
}
+ return false;
}
static struct binder_buffer *binder_alloc_new_buf_locked(
@@ -525,6 +531,7 @@ static struct binder_buffer *binder_alloc_new_buf_locked(
buffer->async_transaction = is_async;
buffer->extra_buffers_size = extra_buffers_size;
buffer->pid = pid;
+ buffer->oneway_spam_suspect = false;
if (is_async) {
alloc->free_async_space -= size + sizeof(struct binder_buffer);
binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
@@ -536,7 +543,9 @@ static struct binder_buffer *binder_alloc_new_buf_locked(
* of async space left (which is less than 10% of total
* buffer size).
*/
- debug_low_async_space_locked(alloc, pid);
+ buffer->oneway_spam_suspect = debug_low_async_space_locked(alloc, pid);
+ } else {
+ alloc->oneway_spam_detected = false;
}
}
return buffer;
diff --git a/drivers/android/binder_alloc.h b/drivers/android/binder_alloc.h
index 6e8e001381af..7dea57a84c79 100644
--- a/drivers/android/binder_alloc.h
+++ b/drivers/android/binder_alloc.h
@@ -26,6 +26,8 @@ struct binder_transaction;
* @clear_on_free: %true if buffer must be zeroed after use
* @allow_user_free: %true if user is allowed to free buffer
* @async_transaction: %true if buffer is in use for an async txn
+ * @oneway_spam_suspect: %true if total async allocate size just exceed
+ * spamming detect threshold
* @debug_id: unique ID for debugging
* @transaction: pointer to associated struct binder_transaction
* @target_node: struct binder_node associated with this buffer
@@ -45,7 +47,8 @@ struct binder_buffer {
unsigned clear_on_free:1;
unsigned allow_user_free:1;
unsigned async_transaction:1;
- unsigned debug_id:28;
+ unsigned oneway_spam_suspect:1;
+ unsigned debug_id:27;
struct binder_transaction *transaction;
@@ -87,6 +90,8 @@ struct binder_lru_page {
* @buffer_size: size of address space specified via mmap
* @pid: pid for associated binder_proc (invariant after init)
* @pages_high: high watermark of offset in @pages
+ * @oneway_spam_detected: %true if oneway spam detection fired, clear that
+ * flag once the async buffer has returned to a healthy state
*
* Bookkeeping structure for per-proc address space management for binder
* buffers. It is normally initialized during binder_init() and binder_mmap()
@@ -107,6 +112,7 @@ struct binder_alloc {
uint32_t buffer_free;
int pid;
size_t pages_high;
+ bool oneway_spam_detected;
};
#ifdef CONFIG_ANDROID_BINDER_IPC_SELFTEST
diff --git a/drivers/android/binder_internal.h b/drivers/android/binder_internal.h
index a50716696fad..810c0b84d3f8 100644
--- a/drivers/android/binder_internal.h
+++ b/drivers/android/binder_internal.h
@@ -155,7 +155,7 @@ enum binder_stat_types {
};
struct binder_stats {
- atomic_t br[_IOC_NR(BR_FROZEN_REPLY) + 1];
+ atomic_t br[_IOC_NR(BR_ONEWAY_SPAM_SUSPECT) + 1];
atomic_t bc[_IOC_NR(BC_REPLY_SG) + 1];
atomic_t obj_created[BINDER_STAT_COUNT];
atomic_t obj_deleted[BINDER_STAT_COUNT];
@@ -174,6 +174,7 @@ struct binder_work {
enum binder_work_type {
BINDER_WORK_TRANSACTION = 1,
BINDER_WORK_TRANSACTION_COMPLETE,
+ BINDER_WORK_TRANSACTION_ONEWAY_SPAM_SUSPECT,
BINDER_WORK_RETURN_ERROR,
BINDER_WORK_NODE,
BINDER_WORK_DEAD_BINDER,
@@ -409,6 +410,8 @@ struct binder_ref {
* @outer_lock: no nesting under innor or node lock
* Lock order: 1) outer, 2) node, 3) inner
* @binderfs_entry: process-specific binderfs log file
+ * @oneway_spam_detection_enabled: process enabled oneway spam detection
+ * or not
*
* Bookkeeping structure for binder processes
*/
@@ -444,6 +447,7 @@ struct binder_proc {
spinlock_t inner_lock;
spinlock_t outer_lock;
struct dentry *binderfs_entry;
+ bool oneway_spam_detection_enabled;
};
/**
diff --git a/include/uapi/linux/android/binder.h b/include/uapi/linux/android/binder.h
index 156070d18c4f..20e435fe657a 100644
--- a/include/uapi/linux/android/binder.h
+++ b/include/uapi/linux/android/binder.h
@@ -241,6 +241,7 @@ struct binder_frozen_status_info {
#define BINDER_SET_CONTEXT_MGR_EXT _IOW('b', 13, struct flat_binder_object)
#define BINDER_FREEZE _IOW('b', 14, struct binder_freeze_info)
#define BINDER_GET_FROZEN_INFO _IOWR('b', 15, struct binder_frozen_status_info)
+#define BINDER_ENABLE_ONEWAY_SPAM_DETECTION _IOW('b', 16, __u32)
/*
* NOTE: Two special error codes you should check for when calling
@@ -428,6 +429,13 @@ enum binder_driver_return_protocol {
* The target of the last transaction (either a bcTRANSACTION or
* a bcATTEMPT_ACQUIRE) is frozen. No parameters.
*/
+
+ BR_ONEWAY_SPAM_SUSPECT = _IO('r', 19),
+ /*
+ * Current process sent too many oneway calls to target, and the last
+ * asynchronous transaction makes the allocated async buffer size exceed
+ * detection threshold. No parameters.
+ */
};
enum binder_driver_command_protocol {
generated by cgit (git 2.34.1) at 2024-06-19 02:47:03 +0000