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linux
y2038: arm64: Extend sysvipc compat data structures
Both 32-bit amd 64-bit ARM use the asm-generic header files for their
sysvipc data structures, so no special care is needed to make those
work beyond y2038, with the one exception of compat mode: Since there
is no asm-generic definition of the compat mode IPC structures, ARM64
provides its own copy, and we make those match the changes in the native
asm-generic header files.
There is sufficient padding in these data structures to extend all
timestamps to 64 bit, but on big-endian ARM kernels, the padding
is in the wrong place, so the C library has to ensure it reassembles
a 64-bit time_t correctly.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
+16
-16
+16
-16
arch/arm64/include/asm/compat.h
+16
-16
arch/arm64/include/asm/compat.h
···
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struct compat_semid64_ds {
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struct compat_ipc64_perm sem_perm;
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compat_time_t sem_otime;
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compat_ulong_t __unused1;
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compat_time_t sem_ctime;
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-
compat_ulong_t __unused2;
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+
compat_ulong_t sem_otime;
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+
compat_ulong_t sem_otime_high;
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+
compat_ulong_t sem_ctime;
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compat_ulong_t sem_ctime_high;
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compat_ulong_t sem_nsems;
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compat_ulong_t __unused3;
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compat_ulong_t __unused4;
···
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struct compat_msqid64_ds {
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struct compat_ipc64_perm msg_perm;
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compat_time_t msg_stime;
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compat_ulong_t __unused1;
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compat_time_t msg_rtime;
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compat_ulong_t __unused2;
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compat_time_t msg_ctime;
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compat_ulong_t __unused3;
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+
compat_ulong_t msg_stime;
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+
compat_ulong_t msg_stime_high;
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+
compat_ulong_t msg_rtime;
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compat_ulong_t msg_rtime_high;
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+
compat_ulong_t msg_ctime;
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compat_ulong_t msg_ctime_high;
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compat_ulong_t msg_cbytes;
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compat_ulong_t msg_qnum;
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compat_ulong_t msg_qbytes;
···
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struct compat_shmid64_ds {
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struct compat_ipc64_perm shm_perm;
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compat_size_t shm_segsz;
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compat_time_t shm_atime;
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compat_ulong_t __unused1;
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compat_time_t shm_dtime;
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compat_ulong_t __unused2;
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-
compat_time_t shm_ctime;
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-
compat_ulong_t __unused3;
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+
compat_ulong_t shm_atime;
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compat_ulong_t shm_atime_high;
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+
compat_ulong_t shm_dtime;
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+
compat_ulong_t shm_dtime_high;
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+
compat_ulong_t shm_ctime;
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+
compat_ulong_t shm_ctime_high;
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compat_pid_t shm_cpid;
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compat_pid_t shm_lpid;
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compat_ulong_t shm_nattch;