linux-kernel - [PATCH 3.13 155/198] arm64: uid16: fix __kernel_old_{gid,uid}

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Date:	Tue, 15 Jul 2014 14:30:25 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Will Deacon <will.deacon@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13 155/198] arm64: uid16: fix __kernel_old_{gid,uid}_t definitions

3.13.11.5 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Will Deacon <will.deacon@....com>

commit 34c65c43f1518bf85f93526ad373adc6a683b4c5 upstream.

Whilst native arm64 applications don't have the 16-bit UID/GID syscalls
wired up, compat tasks can still access them. The 16-bit wrappers for
these syscalls use __kernel_old_uid_t and __kernel_old_gid_t, which must
be 16-bit data types to maintain compatibility with the 16-bit UIDs used
by compat applications.

This patch defines 16-bit __kernel_old_{gid,uid}_t types for arm64
instead of using the 32-bit types provided by asm-generic.

Signed-off-by: Will Deacon <will.deacon@....com>
Acked-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 arch/arm64/include/asm/Kbuild             |  1 -
 arch/arm64/include/uapi/asm/posix_types.h | 10 ++++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm64/include/uapi/asm/posix_types.h

diff --git a/arch/arm64/include/asm/Kbuild b/arch/arm64/include/asm/Kbuild
index 519f89f..0d41221 100644
--- a/arch/arm64/include/asm/Kbuild
+++ b/arch/arm64/include/asm/Kbuild
@@ -28,7 +28,6 @@ generic-y += mutex.h
 generic-y += pci.h
 generic-y += percpu.h
 generic-y += poll.h
-generic-y += posix_types.h
 generic-y += resource.h
 generic-y += scatterlist.h
 generic-y += sections.h
diff --git a/arch/arm64/include/uapi/asm/posix_types.h b/arch/arm64/include/uapi/asm/posix_types.h
new file mode 100644
index 0000000..7985ff6
--- /dev/null
+++ b/arch/arm64/include/uapi/asm/posix_types.h
@@ -0,0 +1,10 @@
+#ifndef __ASM_POSIX_TYPES_H
+#define __ASM_POSIX_TYPES_H
+
+typedef unsigned short __kernel_old_uid_t;
+typedef unsigned short __kernel_old_gid_t;
+#define __kernel_old_uid_t __kernel_old_uid_t
+
+#include <asm-generic/posix_types.h>
+
+#endif /*  __ASM_POSIX_TYPES_H */
-- 
1.9.1

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