binder_fd_array_object starts with a 4-byte header,
followed by a few fields that are 8 bytes when
ANDROID_BINDER_IPC_32BIT=N.
This can cause alignment issues in a 64-bit kernel
with a 32-bit userspace, as on x86_32 an 8-byte primitive
may be aligned to a 4-byte address. Pad with a __u32
to fix this.
Signed-off-by: Martijn Coenen <m...@android.com>
---
include/uapi/linux/android/binder.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/include/uapi/linux/android/binder.h
b/include/uapi/linux/android/binder.h
index 51f891fb1b18..7668b5791c91 100644
--- a/include/uapi/linux/android/binder.h
+++ b/include/uapi/linux/android/binder.h
@@ -132,6 +132,7 @@ enum {
/* struct binder_fd_array_object - object describing an array of fds in a
buffer
* @hdr: common header structure
+ * @pad: padding to ensure correct alignment
* @num_fds: number of file descriptors in the buffer
* @parent: index in offset array to buffer holding the fd array
* @parent_offset: start offset of fd array in the buffer
@@ -152,6 +153,7 @@ enum {
*/
struct binder_fd_array_object {
struct binder_object_header hdr;
+ __u32 pad;
binder_size_t num_fds;
binder_size_t parent;
binder_size_t parent_offset;
--
2.14.0.rc0.400.g1c36432dff-goog
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