diff options
| author | David Howells <dhowells@redhat.com> | 2013-03-13 14:59:45 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-03-13 15:21:48 -0700 |
| commit | 51b154ed5289682364b830858a4a1ca47fcd04e7 (patch) | |
| tree | a7e3ae9ad1047db6cedd5701df4b2f33f6386cd1 | |
| parent | 97da55fcec6e3898f50010a6847dfa64f7c085e6 (diff) | |
UAPI: fix endianness conditionals in linux/aio_abi.h
In the UAPI header files, __BIG_ENDIAN and __LITTLE_ENDIAN must be
compared against __BYTE_ORDER in preprocessor conditionals where these are
exposed to userspace (that is they're not inside __KERNEL__ conditionals).
However, in the main kernel the norm is to check for
"defined(__XXX_ENDIAN)" rather than comparing against __BYTE_ORDER and
this has incorrectly leaked into the userspace headers.
The definition of PADDED() in linux/aio_abi.h is wrong in this way. Note
that userspace will likely interpret this and thus the order of fields in
struct iocb incorrectly as the little-endian variant on big-endian
machines - depending on header inclusion order.
[!!!] NOTE [!!!] This patch may adversely change the userspace API. It might
be better to fix the ordering of aio_key and aio_reserved1 in struct iocb.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Benjamin LaHaise <bcrl@kvack.org>
Acked-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/uapi/linux/aio_abi.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/uapi/linux/aio_abi.h b/include/uapi/linux/aio_abi.h index 86fa7a71336a..bb2554f7fbd1 100644 --- a/include/uapi/linux/aio_abi.h +++ b/include/uapi/linux/aio_abi.h @@ -62,9 +62,9 @@ struct io_event { __s64 res2; /* secondary result */ }; -#if defined(__LITTLE_ENDIAN) +#if defined(__BYTE_ORDER) ? __BYTE_ORDER == __LITTLE_ENDIAN : defined(__LITTLE_ENDIAN) #define PADDED(x,y) x, y -#elif defined(__BIG_ENDIAN) +#elif defined(__BYTE_ORDER) ? __BYTE_ORDER == __BIG_ENDIAN : defined(__BIG_ENDIAN) #define PADDED(x,y) y, x #else #error edit for your odd byteorder. |