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Message-Id: <1477315238-104062-3-git-send-email-maco@android.com> Date: Mon, 24 Oct 2016 15:20:30 +0200 From: Martijn Coenen <maco@...roid.com> To: gregkh@...uxfoundation.org Cc: arve@...roid.com, linux-kernel@...r.kernel.org Subject: [PATCH 02/10] ANDROID: binder: Clear binder and cookie when setting handle in flat binder struct From: Arve Hjønnevåg <arve@...roid.com> Prevents leaking pointers between processes Signed-off-by: Arve Hjønnevåg <arve@...roid.com> --- drivers/android/binder.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/android/binder.c b/drivers/android/binder.c index 3681759..3c71b98 100644 --- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -1584,7 +1584,9 @@ static void binder_transaction(struct binder_proc *proc, fp->type = BINDER_TYPE_HANDLE; else fp->type = BINDER_TYPE_WEAK_HANDLE; + fp->binder = 0; fp->handle = ref->desc; + fp->cookie = 0; binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE, &thread->todo); @@ -1634,7 +1636,9 @@ static void binder_transaction(struct binder_proc *proc, return_error = BR_FAILED_REPLY; goto err_binder_get_ref_for_node_failed; } + fp->binder = 0; fp->handle = new_ref->desc; + fp->cookie = 0; binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL); trace_binder_transaction_ref_to_ref(t, ref, new_ref); @@ -1688,6 +1692,7 @@ static void binder_transaction(struct binder_proc *proc, binder_debug(BINDER_DEBUG_TRANSACTION, " fd %d -> %d\n", fp->handle, target_fd); /* TODO: fput? */ + fp->binder = 0; fp->handle = target_fd; } break; -- 2.8.0.rc3.226.g39d4020
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