linux-kernel - [PATCH] binder: fix sender

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Date:   Wed,  1 Jun 2022 01:00:17 +0000
From:   Carlos Llamas <cmllamas@...gle.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Todd Kjos <tkjos@...roid.com>
Cc:     kernel-team@...roid.com, linux-kernel@...r.kernel.org,
        Carlos Llamas <cmllamas@...gle.com>,
        Christopher Ferris <cferris@...gle.com>
Subject: [PATCH] binder: fix sender_euid type in uapi header

The {pid,uid}_t fields of struct binder_transaction were recently
replaced to use kernel types in commit 169adc2b6b3c ("android/binder.h:
add linux/android/binder(fs).h to UAPI compile-test coverage").

However, using __kernel_uid_t here breaks backwards compatibility in
architectures using 16-bits for this type, since glibc and some others
still expect a 32-bit uid_t. Instead, let's use __kernel_uid32_t which
avoids this compatibility problem.

Fixes: 169adc2b6b3c ("android/binder.h: add linux/android/binder(fs).h to UAPI compile-test coverage")
Reported-by: Christopher Ferris <cferris@...gle.com>
Signed-off-by: Carlos Llamas <cmllamas@...gle.com>
---
 include/uapi/linux/android/binder.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/uapi/linux/android/binder.h b/include/uapi/linux/android/binder.h
index 11157fae8a8e..688bcdaeed53 100644
--- a/include/uapi/linux/android/binder.h
+++ b/include/uapi/linux/android/binder.h
@@ -289,7 +289,7 @@ struct binder_transaction_data {
 	/* General information about the transaction. */
 	__u32	        flags;
 	__kernel_pid_t	sender_pid;
-	__kernel_uid_t	sender_euid;
+	__kernel_uid32_t	sender_euid;
 	binder_size_t	data_size;	/* number of bytes of data */
 	binder_size_t	offsets_size;	/* number of bytes of offsets */
 
-- 
2.36.1.255.ge46751e96f-goog