From c2ab975c30f0c3d3efcd69c1f1b2baa831c9374f Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Tue, 28 Apr 2015 21:39:50 +0200 Subject: y2038: ipc: Report long times to user space The shmid64_ds/semid64_ds/msqid64_ds data structures have been extended to contain extra fields for storing the upper bits of the time stamps, this patch does the other half of the job and and fills the new fields on 32-bit architectures as well as 32-bit tasks running on a 64-bit kernel in compat mode. There should be no change for native 64-bit tasks. Signed-off-by: Arnd Bergmann --- ipc/sem.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) (limited to 'ipc/sem.c') diff --git a/ipc/sem.c b/ipc/sem.c index c6a8a971769d..8935cd8cf166 100644 --- a/ipc/sem.c +++ b/ipc/sem.c @@ -1214,6 +1214,7 @@ static int semctl_stat(struct ipc_namespace *ns, int semid, int cmd, struct semid64_ds *semid64) { struct sem_array *sma; + time64_t semotime; int id = 0; int err; @@ -1257,8 +1258,13 @@ static int semctl_stat(struct ipc_namespace *ns, int semid, } kernel_to_ipc64_perm(&sma->sem_perm, &semid64->sem_perm); - semid64->sem_otime = get_semotime(sma); + semotime = get_semotime(sma); + semid64->sem_otime = semotime; semid64->sem_ctime = sma->sem_ctime; +#ifndef CONFIG_64BIT + semid64->sem_otime_high = semotime >> 32; + semid64->sem_ctime_high = sma->sem_ctime >> 32; +#endif semid64->sem_nsems = sma->sem_nsems; ipc_unlock_object(&sma->sem_perm); @@ -1704,8 +1710,10 @@ static int copy_compat_semid_to_user(void __user *buf, struct semid64_ds *in, struct compat_semid64_ds v; memset(&v, 0, sizeof(v)); to_compat_ipc64_perm(&v.sem_perm, &in->sem_perm); - v.sem_otime = in->sem_otime; - v.sem_ctime = in->sem_ctime; + v.sem_otime = lower_32_bits(in->sem_otime); + v.sem_otime_high = upper_32_bits(in->sem_otime); + v.sem_ctime = lower_32_bits(in->sem_ctime); + v.sem_ctime_high = upper_32_bits(in->sem_ctime); v.sem_nsems = in->sem_nsems; return copy_to_user(buf, &v, sizeof(v)); } else { -- cgit v1.2.3-59-g8ed1b