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| author |   Martijn Coenen <maco@android.com> | 2018-03-28 11:14:50 +0200 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-04-23 12:12:41 +0200 |
| commit | 7aa135fcf26377f92dc0680a57566b4c7f3e281b (patch) | |
| tree | 03d642314fa0c13efe0de04776920dec66e780a1 /drivers/android | |
| parent | Linux 4.17-rc2 (diff) | |
| download | linux-dev-7aa135fcf26377f92dc0680a57566b4c7f3e281b.tar.xz linux-dev-7aa135fcf26377f92dc0680a57566b4c7f3e281b.zip | |
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.c | 8 |
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) { /* |