From: Li Li dualli@google.com
commit b564171ade70570b7f335fa8ed17adb28409e3ac upstream.
Currently cgroup freezer is used to freeze the application threads, and BINDER_FREEZE is used to freeze the corresponding binder interface. There's already a mechanism in ioctl(BINDER_FREEZE) to wait for any existing transactions to drain out before actually freezing the binder interface.
But freezing an app requires 2 steps, freezing the binder interface with ioctl(BINDER_FREEZE) and then freezing the application main threads with cgroupfs. This is not an atomic operation. The following race issue might happen.
1) Binder interface is frozen by ioctl(BINDER_FREEZE); 2) Main thread A initiates a new sync binder transaction to process B; 3) Main thread A is frozen by "echo 1 > cgroup.freeze"; 4) The response from process B reaches the frozen thread, which will unexpectedly fail.
This patch provides a mechanism to check if there's any new pending transaction happening between ioctl(BINDER_FREEZE) and freezing the main thread. If there's any, the main thread freezing operation can be rolled back to finish the pending transaction.
Furthermore, the response might reach the binder driver before the rollback actually happens. That will still cause failed transaction.
As the other process doesn't wait for another response of the response, the response transaction failure can be fixed by treating the response transaction like an oneway/async one, allowing it to reach the frozen thread. And it will be consumed when the thread gets unfrozen later.
NOTE: This patch reuses the existing definition of struct binder_frozen_status_info but expands the bit assignments of __u32 member sync_recv.
To ensure backward compatibility, bit 0 of sync_recv still indicates there's an outstanding sync binder transaction. This patch adds new information to bit 1 of sync_recv, indicating the binder transaction happens exactly when there's a race.
If an existing userspace app runs on a new kernel, a sync binder call will set bit 0 of sync_recv so ioctl(BINDER_GET_FROZEN_INFO) still return the expected value (true). The app just doesn't check bit 1 intentionally so it doesn't have the ability to tell if there's a race. This behavior is aligned with what happens on an old kernel which doesn't set bit 1 at all.
A new userspace app can 1) check bit 0 to know if there's a sync binder transaction happened when being frozen - same as before; and 2) check bit 1 to know if that sync binder transaction happened exactly when there's a race - a new information for rollback decision.
the same time, confirmed the pending transactions succeeded.
Fixes: 432ff1e91694 ("binder: BINDER_FREEZE ioctl") Acked-by: Todd Kjos tkjos@google.com Cc: stable stable@vger.kernel.org Signed-off-by: Li Li dualli@google.com Test: stress test with apps being frozen and initiating binder calls at Link: https://lore.kernel.org/r/20210910164210.2282716-2-dualli@chromium.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/android/binder.c | 35 +++++++++++++++++++++++++++++------ drivers/android/binder_internal.h | 2 ++ include/uapi/linux/android/binder.h | 7 +++++++ 3 files changed, 38 insertions(+), 6 deletions(-)
--- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -3047,9 +3047,8 @@ static void binder_transaction(struct bi if (reply) { binder_enqueue_thread_work(thread, tcomplete); binder_inner_proc_lock(target_proc); - if (target_thread->is_dead || target_proc->is_frozen) { - return_error = target_thread->is_dead ? - BR_DEAD_REPLY : BR_FROZEN_REPLY; + if (target_thread->is_dead) { + return_error = BR_DEAD_REPLY; binder_inner_proc_unlock(target_proc); goto err_dead_proc_or_thread; } @@ -4659,6 +4658,22 @@ static int binder_ioctl_get_node_debug_i return 0; }
+static bool binder_txns_pending_ilocked(struct binder_proc *proc) +{ + struct rb_node *n; + struct binder_thread *thread; + + if (proc->outstanding_txns > 0) + return true; + + for (n = rb_first(&proc->threads); n; n = rb_next(n)) { + thread = rb_entry(n, struct binder_thread, rb_node); + if (thread->transaction_stack) + return true; + } + return false; +} + static int binder_ioctl_freeze(struct binder_freeze_info *info, struct binder_proc *target_proc) { @@ -4690,8 +4705,13 @@ static int binder_ioctl_freeze(struct bi (!target_proc->outstanding_txns), msecs_to_jiffies(info->timeout_ms));
- if (!ret && target_proc->outstanding_txns) - ret = -EAGAIN; + /* Check pending transactions that wait for reply */ + if (ret >= 0) { + binder_inner_proc_lock(target_proc); + if (binder_txns_pending_ilocked(target_proc)) + ret = -EAGAIN; + binder_inner_proc_unlock(target_proc); + }
if (ret < 0) { binder_inner_proc_lock(target_proc); @@ -4707,6 +4727,7 @@ static int binder_ioctl_get_freezer_info { struct binder_proc *target_proc; bool found = false; + __u32 txns_pending;
info->sync_recv = 0; info->async_recv = 0; @@ -4716,7 +4737,9 @@ static int binder_ioctl_get_freezer_info if (target_proc->pid == info->pid) { found = true; binder_inner_proc_lock(target_proc); - info->sync_recv |= target_proc->sync_recv; + txns_pending = binder_txns_pending_ilocked(target_proc); + info->sync_recv |= target_proc->sync_recv | + (txns_pending << 1); info->async_recv |= target_proc->async_recv; binder_inner_proc_unlock(target_proc); } --- a/drivers/android/binder_internal.h +++ b/drivers/android/binder_internal.h @@ -378,6 +378,8 @@ struct binder_ref { * binder transactions * (protected by @inner_lock) * @sync_recv: process received sync transactions since last frozen + * bit 0: received sync transaction after being frozen + * bit 1: new pending sync transaction during freezing * (protected by @inner_lock) * @async_recv: process received async transactions since last frozen * (protected by @inner_lock) --- a/include/uapi/linux/android/binder.h +++ b/include/uapi/linux/android/binder.h @@ -225,7 +225,14 @@ struct binder_freeze_info {
struct binder_frozen_status_info { __u32 pid; + + /* process received sync transactions since last frozen + * bit 0: received sync transaction after being frozen + * bit 1: new pending sync transaction during freezing + */ __u32 sync_recv; + + /* process received async transactions since last frozen */ __u32 async_recv; };