linux-kernel - [PATCH 4/4] UAPI: Fix endianness conditionals in M32R's asm/stat.h

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Date:	Wed, 06 Mar 2013 20:48:00 +0000
From:	David Howells <dhowells@...hat.com>
To:	torvalds@...ux-foundation.org
Cc:	linux-arch@...r.kernel.org, sfr@...b.auug.org.au,
	linux-m32r@...linux-m32r.org, Joakim.Tjernlund@...nsmode.se,
	arnd@...db.de, Hirokazu Takata <takata@...ux-m32r.org>,
	linux-kernel@...r.kernel.org, linux-m32r-ja@...linux-m32r.org,
	akpm@...ux-foundation.org
Subject: [PATCH 4/4] UAPI: Fix endianness conditionals in M32R's asm/stat.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 struct stat64 in M32R's asm/stat.h is wrong in this way.
Note that userspace will likely interpret the field order incorrectly as the
big-endian variant on little-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 st_blocks and __pad4 in struct stat64.

Signed-off-by: David Howells <dhowells@...hat.com>
cc: Hirokazu Takata <takata@...ux-m32r.org>
cc: linux-m32r@...linux-m32r.org
cc: linux-m32r-ja@...linux-m32r.org
---

 arch/m32r/include/uapi/asm/stat.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/m32r/include/uapi/asm/stat.h b/arch/m32r/include/uapi/asm/stat.h
index da4518f..98470fe 100644
--- a/arch/m32r/include/uapi/asm/stat.h
+++ b/arch/m32r/include/uapi/asm/stat.h
@@ -63,10 +63,10 @@ struct stat64 {
 	long long	st_size;
 	unsigned long	st_blksize;

-#if defined(__BIG_ENDIAN)
+#if defined(__BYTE_ORDER) ? __BYTE_ORDER == __BIG_ENDIAN : defined(__BIG_ENDIAN)
 	unsigned long	__pad4;		/* future possible st_blocks high bits */
 	unsigned long	st_blocks;	/* Number 512-byte blocks allocated. */
-#elif defined(__LITTLE_ENDIAN)
+#elif defined(__BYTE_ORDER) ? __BYTE_ORDER == __LITTLE_ENDIAN : defined(__LITTLE_ENDIAN)
 	unsigned long	st_blocks;	/* Number 512-byte blocks allocated. */
 	unsigned long	__pad4;		/* future possible st_blocks high bits */
 #else

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