This is a note to let you know that I've just added the patch titled
ANDROID: binder: Clear binder and cookie when setting handle in flat binder struct
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
android-binder-clear-binder-and-cookie-when-setting-handle-in-flat-binder-struct.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 4afb604e2d14d429ac9e1fd84b952602853b2df5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@xxxxxxxxxxx>
Date: Mon, 24 Oct 2016 15:20:30 +0200
Subject: ANDROID: binder: Clear binder and cookie when setting handle in flat binder struct
MIME-Version: 1.0
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From: Arve Hjønnevåg <arve@xxxxxxxxxxx>
commit 4afb604e2d14d429ac9e1fd84b952602853b2df5 upstream.
Prevents leaking pointers between processes
Signed-off-by: Arve Hjønnevåg <arve@xxxxxxxxxxx>
Signed-off-by: Martijn Coenen <maco@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/android/binder.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -1578,7 +1578,9 @@ static void binder_transaction(struct bi
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);
@@ -1628,7 +1630,9 @@ static void binder_transaction(struct bi
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);
@@ -1682,6 +1686,7 @@ static void binder_transaction(struct bi
binder_debug(BINDER_DEBUG_TRANSACTION,
" fd %d -> %d\n", fp->handle, target_fd);
/* TODO: fput? */
+ fp->binder = 0;
fp->handle = target_fd;
} break;
Patches currently in stable-queue which might be from arve@xxxxxxxxxxx are
queue-4.4/android-binder-add-strong-ref-checks.patch
queue-4.4/android-binder-clear-binder-and-cookie-when-setting-handle-in-flat-binder-struct.patch
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