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Commit c039dbd5 authored by Arnd Bergmann's avatar Arnd Bergmann
Browse files

y2038: x86: Extend sysvipc data structures 



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: default avatarArnd Bergmann <arnd@arndb.de>
parent f991f015

arch/x86/include/asm/compat.h

+16 −16
Original line number Diff line number Diff line
@@ -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;

arch/x86/include/uapi/asm/sembuf.h

+10 −1
Original line number Diff line number Diff line
@@ -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;