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From: Arnd Bergmann <arnd@arndb.de>
To: y2038@lists.linaro.org, linux-kernel@vger.kernel.org
Cc: linux-api@vger.kernel.org, linux-arch@vger.kernel.org,
	libc-alpha@sourceware.org, tglx@linutronix.de,
	deepa.kernel@gmail.com, viro@zeniv.linux.org.uk,
	ebiederm@xmission.com, albert.aribaud@3adev.fr,
	linux-s390@vger.kernel.org, schwidefsky@de.ibm.com,
	x86@kernel.org, catalin.marinas@arm.com, will.deacon@arm.com,
	linux-mips@linux-mips.org, jhogan@kernel.org,
	ralf@linux-mips.org, linuxppc-dev@lists.ozlabs.org,
	sparclinux@vger.kernel.org, zackw@panix.com, noloader@gmail.com,
	Arnd Bergmann <arnd@arndb.de>
Subject: [PATCH v4 10/16] y2038: powerpc: Extend sysvipc data structures
Date: Wed, 25 Apr 2018 17:06:00 +0200	[thread overview]
Message-ID: <20180425150606.954771-10-arnd@arndb.de> (raw)
In-Reply-To: <20180425132242.1500539-1-arnd@arndb.de>

powerpc, uses a nonstandard variation of the generic sysvipc
data structures, intended to have the padding moved around
so it can deal with big-endian 32-bit user space that has
64-bit time_t.

powerpc has the same definition as parisc and sparc, but now also
supports little-endian mode, which is now wrong because the
padding is made for big-endian user space.

This takes just take the same approach here that we have for
the asm-generic headers and adds separate 32-bit fields for the
upper halves of the timestamps, to let libc deal with the mess
in user space.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/powerpc/include/asm/compat.h      | 32 ++++++++++++++++----------------
 arch/powerpc/include/uapi/asm/msgbuf.h | 18 +++++++++---------
 arch/powerpc/include/uapi/asm/sembuf.h | 14 +++++++-------
 arch/powerpc/include/uapi/asm/shmbuf.h | 19 ++++++++-----------
 4 files changed, 40 insertions(+), 43 deletions(-)

diff --git a/arch/powerpc/include/asm/compat.h b/arch/powerpc/include/asm/compat.h
index b4773c81f7d5..85c8af2bb272 100644
--- a/arch/powerpc/include/asm/compat.h
+++ b/arch/powerpc/include/asm/compat.h
@@ -162,10 +162,10 @@ struct compat_ipc64_perm {
 
 struct compat_semid64_ds {
 	struct compat_ipc64_perm sem_perm;
-	unsigned int __unused1;
-	compat_time_t sem_otime;
-	unsigned int __unused2;
-	compat_time_t sem_ctime;
+	unsigned int sem_otime_high;
+	unsigned int sem_otime;
+	unsigned int sem_ctime_high;
+	unsigned int sem_ctime;
 	compat_ulong_t sem_nsems;
 	compat_ulong_t __unused3;
 	compat_ulong_t __unused4;
@@ -173,12 +173,12 @@ struct compat_semid64_ds {
 
 struct compat_msqid64_ds {
 	struct compat_ipc64_perm msg_perm;
-	unsigned int __unused1;
-	compat_time_t msg_stime;
-	unsigned int __unused2;
-	compat_time_t msg_rtime;
-	unsigned int __unused3;
-	compat_time_t msg_ctime;
+	unsigned int msg_stime_high;
+	unsigned int msg_stime;
+	unsigned int msg_rtime_high;
+	unsigned int msg_rtime;
+	unsigned int msg_ctime_high;
+	unsigned int msg_ctime;
 	compat_ulong_t msg_cbytes;
 	compat_ulong_t msg_qnum;
 	compat_ulong_t msg_qbytes;
@@ -190,12 +190,12 @@ struct compat_msqid64_ds {
 
 struct compat_shmid64_ds {
 	struct compat_ipc64_perm shm_perm;
-	unsigned int __unused1;
-	compat_time_t shm_atime;
-	unsigned int __unused2;
-	compat_time_t shm_dtime;
-	unsigned int __unused3;
-	compat_time_t shm_ctime;
+	unsigned int shm_atime_high;
+	unsigned int shm_atime;
+	unsigned int shm_dtime_high;
+	unsigned int shm_dtime;
+	unsigned int shm_ctime_high;
+	unsigned int shm_ctime;
 	unsigned int __unused4;
 	compat_size_t shm_segsz;
 	compat_pid_t shm_cpid;
diff --git a/arch/powerpc/include/uapi/asm/msgbuf.h b/arch/powerpc/include/uapi/asm/msgbuf.h
index 65beb0942500..2b1b37797a47 100644
--- a/arch/powerpc/include/uapi/asm/msgbuf.h
+++ b/arch/powerpc/include/uapi/asm/msgbuf.h
@@ -10,18 +10,18 @@
 
 struct msqid64_ds {
 	struct ipc64_perm msg_perm;
-#ifndef __powerpc64__
-	unsigned int	__unused1;
-#endif
+#ifdef __powerpc64__
 	__kernel_time_t msg_stime;	/* last msgsnd time */
-#ifndef __powerpc64__
-	unsigned int	__unused2;
-#endif
 	__kernel_time_t msg_rtime;	/* last msgrcv time */
-#ifndef __powerpc64__
-	unsigned int	__unused3;
-#endif
 	__kernel_time_t msg_ctime;	/* last change time */
+#else
+	unsigned long  msg_stime_high;
+	unsigned long  msg_stime;	/* last msgsnd time */
+	unsigned long  msg_rtime_high;
+	unsigned long  msg_rtime;	/* last msgrcv time */
+	unsigned long  msg_ctime_high;
+	unsigned long  msg_ctime;	/* last change time */
+#endif
 	unsigned long  msg_cbytes;	/* current number of bytes on queue */
 	unsigned long  msg_qnum;	/* number of messages in queue */
 	unsigned long  msg_qbytes;	/* max number of bytes on queue */
diff --git a/arch/powerpc/include/uapi/asm/sembuf.h b/arch/powerpc/include/uapi/asm/sembuf.h
index 8f393d60f02d..3f60946f77e3 100644
--- a/arch/powerpc/include/uapi/asm/sembuf.h
+++ b/arch/powerpc/include/uapi/asm/sembuf.h
@@ -15,20 +15,20 @@
  * between kernel and user space.
  *
  * Pad space is left for:
- * - 64-bit time_t to solve y2038 problem
- * - 2 miscellaneous 32-bit values
+ * - 2 miscellaneous 32/64-bit values
  */
 
 struct semid64_ds {
 	struct ipc64_perm sem_perm;	/* permissions .. see ipc.h */
 #ifndef __powerpc64__
-	unsigned long	__unused1;
-#endif
+	unsigned long	sem_otime_high;
+	unsigned long	sem_otime;	/* last semop time */
+	unsigned long	sem_ctime_high;
+	unsigned long	sem_ctime;	/* last change time */
+#else
 	__kernel_time_t	sem_otime;	/* last semop time */
-#ifndef __powerpc64__
-	unsigned long	__unused2;
-#endif
 	__kernel_time_t	sem_ctime;	/* last change time */
+#endif
 	unsigned long	sem_nsems;	/* no. of semaphores in array */
 	unsigned long	__unused3;
 	unsigned long	__unused4;
diff --git a/arch/powerpc/include/uapi/asm/shmbuf.h b/arch/powerpc/include/uapi/asm/shmbuf.h
index deb1c3e503d3..b591c4d7e4c5 100644
--- a/arch/powerpc/include/uapi/asm/shmbuf.h
+++ b/arch/powerpc/include/uapi/asm/shmbuf.h
@@ -16,25 +16,22 @@
  * between kernel and user space.
  *
  * Pad space is left for:
- * - 64-bit time_t to solve y2038 problem
  * - 2 miscellaneous 32-bit values
  */
 
 struct shmid64_ds {
 	struct ipc64_perm	shm_perm;	/* operation perms */
-#ifndef __powerpc64__
-	unsigned long		__unused1;
-#endif
+#ifdef __powerpc64__
 	__kernel_time_t		shm_atime;	/* last attach time */
-#ifndef __powerpc64__
-	unsigned long		__unused2;
-#endif
 	__kernel_time_t		shm_dtime;	/* last detach time */
-#ifndef __powerpc64__
-	unsigned long		__unused3;
-#endif
 	__kernel_time_t		shm_ctime;	/* last change time */
-#ifndef __powerpc64__
+#else
+	unsigned long		shm_atime_high;
+	unsigned long		shm_atime;	/* last attach time */
+	unsigned long		shm_dtime_high;
+	unsigned long		shm_dtime;	/* last detach time */
+	unsigned long		shm_ctime_high;
+	unsigned long		shm_ctime;	/* last change time */
 	unsigned long		__unused4;
 #endif
 	size_t			shm_segsz;	/* size of segment (bytes) */
-- 
2.9.0

  parent reply	other threads:[~2018-04-25 15:06 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-25 13:22 [GIT PULL, PATCH v4 00/16] y2038: IPC system call conversion Arnd Bergmann
2018-04-25 15:05 ` [PATCH v4 01/16] y2038: asm-generic: Extend sysvipc data structures Arnd Bergmann
2018-04-25 15:05 ` [PATCH v4 02/16] y2038: x86: " Arnd Bergmann
2018-04-25 15:05 ` [PATCH v4 03/16] y2038: alpha: Remove unneeded ipc uapi header files Arnd Bergmann
2018-04-25 15:05 ` [PATCH v4 04/16] y2038: ia64: " Arnd Bergmann
2018-04-25 15:05 ` [PATCH v4 05/16] y2038: s390: " Arnd Bergmann
2018-04-25 15:05 ` [PATCH v4 06/16] y2038: arm64: Extend sysvipc compat data structures Arnd Bergmann
2018-04-25 15:05 ` [PATCH v4 07/16] y2038: mips: Extend sysvipc " Arnd Bergmann
2018-04-25 15:05 ` [PATCH v4 08/16] y2038: parisc: " Arnd Bergmann
2018-04-25 15:05 ` [PATCH v4 09/16] y2038: sparc: " Arnd Bergmann
2018-04-25 15:06 ` Arnd Bergmann [this message]
2018-04-25 15:06 ` [PATCH v4 11/16] y2038: xtensa: " Arnd Bergmann
2018-04-25 15:06 ` [PATCH v4 12/16] y2038: ipc: Use ktime_get_real_seconds consistently Arnd Bergmann
2018-04-25 15:06 ` [PATCH v4 13/16] y2038: ipc: Report long times to user space Arnd Bergmann
2018-04-25 15:06 ` [PATCH v4 14/16] y2038: ipc: Use __kernel_timespec Arnd Bergmann
2018-04-25 15:06 ` [PATCH v4 15/16] y2038: ipc: Enable COMPAT_32BIT_TIME Arnd Bergmann
2018-04-25 15:06 ` [PATCH v4 16/16] y2038: ipc: Redirect ipc(SEMTIMEDOP, ...) to compat_ksys_semtimedop Arnd Bergmann

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