ANDROID: binder: prevent transactions into own process.
commit 7aa135fcf2
upstream.
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>
pull/10/head
parent
bddabeb71f
commit
fd0485e2cc
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@ -2785,6 +2785,14 @@ static void binder_transaction(struct binder_proc *proc,
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else
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return_error = BR_DEAD_REPLY;
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mutex_unlock(&context->context_mgr_node_lock);
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if (target_node && target_proc == proc) {
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binder_user_error("%d:%d got transaction to context manager from process owning it\n",
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proc->pid, thread->pid);
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return_error = BR_FAILED_REPLY;
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return_error_param = -EINVAL;
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return_error_line = __LINE__;
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goto err_invalid_target_handle;
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}
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}
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if (!target_node) {
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/*
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