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ANDROID: binder: prevent transactions into own process. 

This can't happen with normal nodes (because you can't get a ref
to a node you own), but it could happen with the context manager;
to make the behavior consistent with regular nodes, reject
transactions into the context manager by the process owning it.

Reported-by: syzbot+09e05aba06723a94d43d@syzkaller.appspotmail.com
Signed-off-by: Martijn Coenen <maco@android.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Martijn Coenen 2018-03-28 11:14:50 +02:00 committed by Greg Kroah-Hartman
parent 6d08b06e67
commit 7aa135fcf2
1 changed files with 8 additions and 0 deletions
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8
drivers/android/binder.c
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@ -2839,6 +2839,14 @@ static void binder_transaction(struct binder_proc *proc,
else
return_error = BR_DEAD_REPLY;
mutex_unlock(&context->context_mgr_node_lock);
if (target_node && target_proc == proc) {
binder_user_error("%d:%d got transaction to context manager from process owning it\n",
proc->pid, thread->pid);
return_error = BR_FAILED_REPLY;
return_error_param = -EINVAL;
return_error_line = __LINE__;
goto err_invalid_target_handle;
}
}
if (!target_node) {
/*