linux-kernel - [PATCH 3.16 57/99] sparc32: fix struct ipc64

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Message-ID: <lsq.1589984008.88666755@decadent.org.uk>
Date:   Wed, 20 May 2020 15:14:25 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Dmitry V . Levin" <ldv@...linux.org>,
        "Arnd Bergmann" <arnd@...db.de>, "Rich Felker" <dalias@...c.org>,
        libc-alpha@...rceware.org, "David S. Miller" <davem@...emloft.net>,
        "Sam Ravnborg" <sam@...nborg.org>
Subject: [PATCH 3.16 57/99] sparc32: fix struct ipc64_perm type definition

3.16.84-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Arnd Bergmann <arnd@...db.de>

commit 34ca70ef7d3a9fa7e89151597db5e37ae1d429b4 upstream.

As discussed in the strace issue tracker, it appears that the sparc32
sysvipc support has been broken for the past 11 years. It was however
working in compat mode, which is how it must have escaped most of the
regular testing.

The problem is that a cleanup patch inadvertently changed the uid/gid
fields in struct ipc64_perm from 32-bit types to 16-bit types in uapi
headers.

Both glibc and uclibc-ng still use the original types, so they should
work fine with compat mode, but not natively.  Change the definitions
to use __kernel_uid32_t and __kernel_gid32_t again.

Fixes: 83c86984bff2 ("sparc: unify ipcbuf.h")
Link: https://github.com/strace/strace/issues/116
Cc: Sam Ravnborg <sam@...nborg.org>
Cc: "Dmitry V . Levin" <ldv@...linux.org>
Cc: Rich Felker <dalias@...c.org>
Cc: libc-alpha@...rceware.org
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/sparc/include/uapi/asm/ipcbuf.h | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

--- a/arch/sparc/include/uapi/asm/ipcbuf.h
+++ b/arch/sparc/include/uapi/asm/ipcbuf.h
@@ -14,19 +14,19 @@
 
 struct ipc64_perm
 {
-	__kernel_key_t	key;
-	__kernel_uid_t	uid;
-	__kernel_gid_t	gid;
-	__kernel_uid_t	cuid;
-	__kernel_gid_t	cgid;
+	__kernel_key_t		key;
+	__kernel_uid32_t	uid;
+	__kernel_gid32_t	gid;
+	__kernel_uid32_t	cuid;
+	__kernel_gid32_t	cgid;
 #ifndef __arch64__
-	unsigned short	__pad0;
+	unsigned short		__pad0;
 #endif
-	__kernel_mode_t	mode;
-	unsigned short	__pad1;
-	unsigned short	seq;
-	unsigned long long __unused1;
-	unsigned long long __unused2;
+	__kernel_mode_t		mode;
+	unsigned short		__pad1;
+	unsigned short		seq;
+	unsigned long long	__unused1;
+	unsigned long long	__unused2;
 };
 
 #endif /* __SPARC_IPCBUF_H */