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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 02/16] y2038: x86: Extend sysvipc data structures
Date: Wed, 25 Apr 2018 17:05:52 +0200	[thread overview]
Message-ID: <20180425150606.954771-2-arnd@arndb.de> (raw)
In-Reply-To: <20180425132242.1500539-1-arnd@arndb.de>

This extends the x86 copy of the sysvipc data structures to deal with
32-bit user space that has 64-bit time_t and wants to see timestamps
beyond 2038.

Fortunately, x86 has padding for this purpose in all the data structures,
so we can just add extra fields. With msgid64_ds and shmid64_ds, the
data structure is identical to the asm-generic version, which we have
already extended.

For some reason however, the 64-bit version of semid64_ds ended up with
extra padding, so I'm implementing the same approach as the asm-generic
version here, by using separate fields for the upper and lower halves
of the two timestamps.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/x86/include/asm/compat.h      | 32 ++++++++++++++++----------------
 arch/x86/include/uapi/asm/sembuf.h | 11 ++++++++++-
 2 files changed, 26 insertions(+), 17 deletions(-)

diff --git a/arch/x86/include/asm/compat.h b/arch/x86/include/asm/compat.h
index 7cd314b71c51..fb97cf7c4137 100644
--- a/arch/x86/include/asm/compat.h
+++ b/arch/x86/include/asm/compat.h
@@ -134,10 +134,10 @@ struct compat_ipc64_perm {
 
 struct compat_semid64_ds {
 	struct compat_ipc64_perm sem_perm;
-	compat_time_t  sem_otime;
-	compat_ulong_t __unused1;
-	compat_time_t  sem_ctime;
-	compat_ulong_t __unused2;
+	compat_ulong_t sem_otime;
+	compat_ulong_t sem_otime_high;
+	compat_ulong_t sem_ctime;
+	compat_ulong_t sem_ctime_high;
 	compat_ulong_t sem_nsems;
 	compat_ulong_t __unused3;
 	compat_ulong_t __unused4;
@@ -145,12 +145,12 @@ struct compat_semid64_ds {
 
 struct compat_msqid64_ds {
 	struct compat_ipc64_perm msg_perm;
-	compat_time_t  msg_stime;
-	compat_ulong_t __unused1;
-	compat_time_t  msg_rtime;
-	compat_ulong_t __unused2;
-	compat_time_t  msg_ctime;
-	compat_ulong_t __unused3;
+	compat_ulong_t msg_stime;
+	compat_ulong_t msg_stime_high;
+	compat_ulong_t msg_rtime;
+	compat_ulong_t msg_rtime_high;
+	compat_ulong_t msg_ctime;
+	compat_ulong_t msg_ctime_high;
 	compat_ulong_t msg_cbytes;
 	compat_ulong_t msg_qnum;
 	compat_ulong_t msg_qbytes;
@@ -163,12 +163,12 @@ struct compat_msqid64_ds {
 struct compat_shmid64_ds {
 	struct compat_ipc64_perm shm_perm;
 	compat_size_t  shm_segsz;
-	compat_time_t  shm_atime;
-	compat_ulong_t __unused1;
-	compat_time_t  shm_dtime;
-	compat_ulong_t __unused2;
-	compat_time_t  shm_ctime;
-	compat_ulong_t __unused3;
+	compat_ulong_t shm_atime;
+	compat_ulong_t shm_atime_high;
+	compat_ulong_t shm_dtime;
+	compat_ulong_t shm_dtime_high;
+	compat_ulong_t shm_ctime;
+	compat_ulong_t shm_ctime_high;
 	compat_pid_t   shm_cpid;
 	compat_pid_t   shm_lpid;
 	compat_ulong_t shm_nattch;
diff --git a/arch/x86/include/uapi/asm/sembuf.h b/arch/x86/include/uapi/asm/sembuf.h
index cabd7476bd6c..89de6cd9f0a7 100644
--- a/arch/x86/include/uapi/asm/sembuf.h
+++ b/arch/x86/include/uapi/asm/sembuf.h
@@ -8,15 +8,24 @@
  * between kernel and user space.
  *
  * Pad space is left for:
- * - 64-bit time_t to solve y2038 problem
  * - 2 miscellaneous 32-bit values
+ *
+ * x86_64 and x32 incorrectly added padding here, so the structures
+ * are still incompatible with the padding on x86.
  */
 struct semid64_ds {
 	struct ipc64_perm sem_perm;	/* permissions .. see ipc.h */
+#ifdef __i386__
+	unsigned long	sem_otime;	/* last semop time */
+	unsigned long	sem_otime_high;
+	unsigned long	sem_ctime;	/* last change time */
+	unsigned long	sem_ctime_high;
+#else
 	__kernel_time_t	sem_otime;	/* last semop time */
 	__kernel_ulong_t __unused1;
 	__kernel_time_t	sem_ctime;	/* last change time */
 	__kernel_ulong_t __unused2;
+#endif
 	__kernel_ulong_t sem_nsems;	/* no. of semaphores in array */
 	__kernel_ulong_t __unused3;
 	__kernel_ulong_t __unused4;
-- 
2.9.0


  parent reply	other threads:[~2018-04-25 15:12 UTC|newest]

Thread overview: 38+ 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 13:22 ` [PATCH v4 01/16] y2038: asm-generic: Extend sysvipc data structures Arnd Bergmann
2018-04-25 15:07   ` Arnd Bergmann
2018-04-25 13:22 ` [PATCH v4 02/16] y2038: x86: " Arnd Bergmann
2018-04-25 13:22 ` [PATCH v4 03/16] y2038: alpha: Remove unneeded ipc uapi header files Arnd Bergmann
2018-04-25 13:22 ` [PATCH v4 04/16] y2038: ia64: " Arnd Bergmann
2018-04-25 13:22 ` [PATCH v4 05/16] y2038: s390: " Arnd Bergmann
2018-04-25 13:22 ` [PATCH v4 06/16] y2038: arm64: Extend sysvipc compat data structures Arnd Bergmann
2018-04-25 13:22 ` [PATCH v4 07/16] y2038: mips: Extend sysvipc " Arnd Bergmann
2018-04-25 13:22 ` [PATCH v4 08/16] y2038: parisc: " Arnd Bergmann
2018-04-25 13:22 ` [PATCH v4 09/16] y2038: sparc: " Arnd Bergmann
2018-04-25 13:22 ` [PATCH v4 10/16] y2038: powerpc: " Arnd Bergmann
2018-04-25 13:22 ` [PATCH v4 11/16] y2038: xtensa: " Arnd Bergmann
2018-04-25 13:22 ` [PATCH v4 12/16] y2038: ipc: Use ktime_get_real_seconds consistently Arnd Bergmann
2018-04-25 13:22 ` [PATCH v4 13/16] y2038: ipc: Report long times to user space Arnd Bergmann
2018-04-25 13:22 ` [PATCH v4 14/16] y2038: ipc: Use __kernel_timespec Arnd Bergmann
2018-04-25 13:22 ` [PATCH v4 15/16] y2038: ipc: Enable COMPAT_32BIT_TIME Arnd Bergmann
2018-04-25 13:22 ` [PATCH v4 16/16] y2038: ipc: Redirect ipc(SEMTIMEDOP, ...) to compat_ksys_semtimedop Arnd Bergmann
2018-04-25 15:01 ` [PATCH v4 01/16] y2038: asm-generic: Extend sysvipc data structures Arnd Bergmann
2018-04-25 15:01 ` [PATCH v4 02/16] y2038: x86: " Arnd Bergmann
2018-04-25 15:01 ` [PATCH v4 03/16] y2038: alpha: Remove unneeded ipc uapi header files Arnd Bergmann
2018-04-25 15:01 ` [PATCH v4 04/16] y2038: ia64: " 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 ` Arnd Bergmann [this message]
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 ` [PATCH v4 10/16] y2038: powerpc: " Arnd Bergmann
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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