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Index: head/sys/kern/sysv_sem.c
===================================================================
--- head/sys/kern/sysv_sem.c
+++ head/sys/kern/sysv_sem.c
@@ -187,13 +187,13 @@
#define SEM_ALIGN(bytes) roundup2(bytes, sizeof(long))
/* actual size of an undo structure */
-#define SEMUSZ SEM_ALIGN(offsetof(struct sem_undo, un_ent[SEMUME]))
+#define SEMUSZ(x) SEM_ALIGN(offsetof(struct sem_undo, un_ent[(x)]))
/*
* Macro to find a particular sem_undo vector
*/
#define SEMU(ix) \
- ((struct sem_undo *)(((intptr_t)semu)+ix * seminfo.semusz))
+ ((struct sem_undo *)(((intptr_t)semu) + (ix) * seminfo.semusz))
/*
* semaphore info struct
@@ -205,7 +205,7 @@
.semmsl = SEMMSL, /* max # of semaphores per id */
.semopm = SEMOPM, /* max # of operations per semop call */
.semume = SEMUME, /* max # of undo entries per process */
- .semusz = SEMUSZ, /* size in bytes of undo structure */
+ .semusz = SEMUSZ(SEMUME), /* size in bytes of undo structure */
.semvmx = SEMVMX, /* semaphore maximum value */
.semaem = SEMAEM, /* adjust on exit max value */
};
@@ -222,7 +222,7 @@
"Max operations per semop call");
SYSCTL_INT(_kern_ipc, OID_AUTO, semume, CTLFLAG_RDTUN, &seminfo.semume, 0,
"Max undo entries per process");
-SYSCTL_INT(_kern_ipc, OID_AUTO, semusz, CTLFLAG_RDTUN, &seminfo.semusz, 0,
+SYSCTL_INT(_kern_ipc, OID_AUTO, semusz, CTLFLAG_RD, &seminfo.semusz, 0,
"Size in bytes of undo structure");
SYSCTL_INT(_kern_ipc, OID_AUTO, semvmx, CTLFLAG_RWTUN, &seminfo.semvmx, 0,
"Semaphore maximum value");
@@ -284,6 +284,7 @@
M_WAITOK | M_ZERO);
sema_mtx = malloc(sizeof(struct mtx) * seminfo.semmni, M_SEM,
M_WAITOK | M_ZERO);
+ seminfo.semusz = SEMUSZ(seminfo.semume);
semu = malloc(seminfo.semmnu * seminfo.semusz, M_SEM, M_WAITOK);
for (i = 0; i < seminfo.semmni; i++) {

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