Commit 3f3a4b3f authored by Arnd Bergmann's avatar Arnd Bergmann
Browse files

y2038: mips: Extend sysvipc data structures 



MIPS is the weirdest case for sysvipc, because each of the
three data structures is done differently:

* msqid64_ds has padding in the right place so we could in theory
  extend this one to just have 64-bit values instead of time_t.
  As this does not work for most of the other combinations,
  we just handle it in the common manner though.

* semid64_ds has no padding for 64-bit time_t, but has two reserved
  'long' fields, which are sufficient to extend the sem_otime
  and sem_ctime fields to 64 bit. In order to do this, the libc
  implementation will have to copy the data into another structure
  that has the fields in a different order. MIPS is the only
  architecture with this problem, so this is best done in MIPS
  specific libc code.

* shmid64_ds is slightly worse than that, because it has three
  time_t fields but only two unused 32-bit words. As a workaround,
  we extend each field only by 16 bits, ending up with 48-bit
  timestamps that user space again has to work around by itself.

The compat versions of the data structures are changed in the
same way.

Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
parent 83335eb4

arch/mips/include/asm/compat.h

+22 −18
Original line number Diff line number Diff line
@@ -37,9 +37,11 @@ typedef struct { 
typedef s32		compat_timer_t;

typedef s32		compat_key_t;



typedef s16		compat_short_t;

typedef s32		compat_int_t;

typedef s32		compat_long_t;

typedef s64		compat_s64;

typedef u16		compat_ushort_t;

typedef u32		compat_uint_t;

typedef u32		compat_ulong_t;

typedef u64		compat_u64;
@@ -157,35 +159,35 @@ struct compat_ipc64_perm { 


struct compat_semid64_ds {

	struct compat_ipc64_perm sem_perm;

	compat_time_t	sem_otime;

	compat_time_t	sem_ctime;

	compat_ulong_t	sem_otime;

	compat_ulong_t	sem_ctime;

	compat_ulong_t	sem_nsems;

	compat_ulong_t	__unused1;

	compat_ulong_t	__unused2;

	compat_ulong_t	sem_otime_high;

	compat_ulong_t	sem_ctime_high;

};



struct compat_msqid64_ds {

	struct compat_ipc64_perm msg_perm;

#ifndef CONFIG_CPU_LITTLE_ENDIAN

	compat_ulong_t	__unused1;

	compat_ulong_t	msg_stime_high;

#endif

	compat_time_t	msg_stime;

	compat_ulong_t	msg_stime;

#ifdef CONFIG_CPU_LITTLE_ENDIAN

	compat_ulong_t	__unused1;

	compat_ulong_t	msg_stime_high;

#endif

#ifndef CONFIG_CPU_LITTLE_ENDIAN

	compat_ulong_t	__unused2;

	compat_ulong_t	msg_rtime_high;

#endif

	compat_time_t	msg_rtime;

	compat_ulong_t	msg_rtime;

#ifdef CONFIG_CPU_LITTLE_ENDIAN

	compat_ulong_t	__unused2;

	compat_ulong_t	msg_rtime_high;

#endif

#ifndef CONFIG_CPU_LITTLE_ENDIAN

	compat_ulong_t	__unused3;

	compat_ulong_t	msg_ctime_high;

#endif

	compat_time_t	msg_ctime;

	compat_ulong_t	msg_ctime;

#ifdef CONFIG_CPU_LITTLE_ENDIAN

	compat_ulong_t	__unused3;

	compat_ulong_t	msg_ctime_high;

#endif

	compat_ulong_t	msg_cbytes;

	compat_ulong_t	msg_qnum;
@@ -199,14 +201,16 @@ 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_time_t	shm_dtime;

	compat_time_t	shm_ctime;

	compat_ulong_t	shm_atime;

	compat_ulong_t	shm_dtime;

	compat_ulong_t	shm_ctime;

	compat_pid_t	shm_cpid;

	compat_pid_t	shm_lpid;

	compat_ulong_t	shm_nattch;

	compat_ulong_t	__unused1;

	compat_ulong_t	__unused2;

	compat_ushort_t	shm_atime_high;

	compat_ushort_t	shm_dtime_high;

	compat_ushort_t	shm_ctime_high;

	compat_ushort_t	__unused2;

};



/* MIPS has unusual order of fields in stack_t */

arch/mips/include/uapi/asm/msgbuf.h

+38 −19
Original line number Diff line number Diff line
@@ -9,33 +9,15 @@ 
 * between kernel and user space.

 *

 * Pad space is left for:

 * - extension of time_t to 64-bit on 32-bitsystem to solve the y2038 problem

 * - 2 miscellaneous unsigned long values

 */



#if defined(__mips64)

struct msqid64_ds {

	struct ipc64_perm msg_perm;

#if !defined(__mips64) && defined(__MIPSEB__)

	unsigned long	__unused1;

#endif

	__kernel_time_t msg_stime;	/* last msgsnd time */

#if !defined(__mips64) && defined(__MIPSEL__)

	unsigned long	__unused1;

#endif

#if !defined(__mips64) && defined(__MIPSEB__)

	unsigned long	__unused2;

#endif

	__kernel_time_t msg_rtime;	/* last msgrcv time */

#if !defined(__mips64) && defined(__MIPSEL__)

	unsigned long	__unused2;

#endif

#if !defined(__mips64) && defined(__MIPSEB__)

	unsigned long	__unused3;

#endif

	__kernel_time_t msg_ctime;	/* last change time */

#if !defined(__mips64) && defined(__MIPSEL__)

	unsigned long	__unused3;

#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 */
@@ -44,5 +26,42 @@ struct msqid64_ds { 
	unsigned long  __unused4;

	unsigned long  __unused5;

};

#elif defined (__MIPSEB__)

struct msqid64_ds {

	struct ipc64_perm msg_perm;

	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 */

	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 */

	__kernel_pid_t msg_lspid;	/* pid of last msgsnd */

	__kernel_pid_t msg_lrpid;	/* last receive pid */

	unsigned long  __unused4;

	unsigned long  __unused5;

};

#elif defined (__MIPSEL__)

struct msqid64_ds {

	struct ipc64_perm msg_perm;

	unsigned long  msg_stime;	/* last msgsnd time */

	unsigned long  msg_stime_high;

	unsigned long  msg_rtime;	/* last msgrcv time */

	unsigned long  msg_rtime_high;

	unsigned long  msg_ctime;	/* last change time */

	unsigned long  msg_ctime_high;

	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 */

	__kernel_pid_t msg_lspid;	/* pid of last msgsnd */

	__kernel_pid_t msg_lrpid;	/* last receive pid */

	unsigned long  __unused4;

	unsigned long  __unused5;

};

#else

#warning no endianess set

#endif



#endif /* _ASM_MSGBUF_H */

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

+13 −2
Original line number Diff line number Diff line
@@ -7,10 +7,11 @@ 
 * Note extra padding because this structure is passed back and forth

 * between kernel and user space.

 *

 * Pad space is left for:

 * - 2 miscellaneous 64-bit values

 * Pad space is left for 2 miscellaneous 64-bit values on mips64,

 * but used for the upper 32 bit of the time values on mips32.

 */



#ifdef __mips64

struct semid64_ds {

	struct ipc64_perm sem_perm;		/* permissions .. see ipc.h */

	__kernel_time_t sem_otime;		/* last semop time */
@@ -19,5 +20,15 @@ struct semid64_ds { 
	unsigned long	__unused1;

	unsigned long	__unused2;

};

#else

struct semid64_ds {

	struct ipc64_perm sem_perm;		/* permissions .. see ipc.h */

	unsigned long   sem_otime;		/* last semop time */

	unsigned long   sem_ctime;		/* last change time */

	unsigned long	sem_nsems;		/* no. of semaphores in array */

	unsigned long	sem_otime_high;

	unsigned long	sem_ctime_high;

};

#endif



#endif /* _ASM_SEMBUF_H */

arch/mips/include/uapi/asm/shmbuf.h

+21 −2
Original line number Diff line number Diff line
@@ -7,10 +7,13 @@ 
 * Note extra padding because this structure is passed back and forth

 * between kernel and user space.

 *

 * Pad space is left for:

 * - 2 miscellaneous 32-bit rsp. 64-bit values

 * As MIPS was lacking proper padding after shm_?time, we use 48 bits

 * of the padding at the end to store a few additional bits of the time.

 * libc implementations need to take care to convert this into a proper

 * data structure when moving to 64-bit time_t.

 */



#ifdef __mips64

struct shmid64_ds {

	struct ipc64_perm	shm_perm;	/* operation perms */

	size_t			shm_segsz;	/* size of segment (bytes) */
@@ -23,6 +26,22 @@ struct shmid64_ds { 
	unsigned long		__unused1;

	unsigned long		__unused2;

};

#else

struct shmid64_ds {

	struct ipc64_perm	shm_perm;	/* operation perms */

	size_t			shm_segsz;	/* size of segment (bytes) */

	unsigned long		shm_atime;	/* last attach time */

	unsigned long		shm_dtime;	/* last detach time */

	unsigned long		shm_ctime;	/* last change time */

	__kernel_pid_t		shm_cpid;	/* pid of creator */

	__kernel_pid_t		shm_lpid;	/* pid of last operator */

	unsigned long		shm_nattch;	/* no. of current attaches */

	unsigned short		shm_atime_high;

	unsigned short		shm_dtime_high;

	unsigned short		shm_ctime_high;

	unsigned short		__unused1;

};

#endif



struct shminfo64 {

	unsigned long	shmmax;

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