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: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann
parent
83335eb4f6
commit
3f3a4b3fbf
|
|
@ -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 */
|
||||
|
|
|
|||
|
|
@ -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 */
|
||||
|
|
|
|||
|
|
@ -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 */
|
||||
|
|
|
|||
|
|
@ -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;
|
||||
|
|
|
|||
Loading…
Reference in New Issue