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authorMartijn Coenen <maco@android.com>2018-03-28 12:14:50 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-04-23 13:12:41 +0300
commit7aa135fcf26377f92dc0680a57566b4c7f3e281b (patch)
tree03d642314fa0c13efe0de04776920dec66e780a1 /drivers/android
parent6d08b06e67cd117f6992c46611dfb4ce267cd71e (diff)
downloadlinux-7aa135fcf26377f92dc0680a57566b4c7f3e281b.tar.xz
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>
Diffstat (limited to 'drivers/android')
-rw-r--r--drivers/android/binder.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 764b63a5aade..e578eee31589 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -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) {
/*