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-rw-r--r--ipc/sem.c18
1 files changed, 14 insertions, 4 deletions
diff --git a/ipc/sem.c b/ipc/sem.c
index 59a3cd1..5af1943 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -85,6 +85,7 @@
#include <linux/nsproxy.h>
#include <linux/ipc_namespace.h>
#include <linux/sched/wake_q.h>
+#include <linux/nospec.h>
#include <linux/uaccess.h>
#include "util.h"
@@ -368,6 +369,7 @@ static inline int sem_lock(struct sem_array *sma, struct sembuf *sops,
int nsops)
{
struct sem *sem;
+ int idx;
if (nsops != 1) {
/* Complex operation - acquire a full lock */
@@ -385,7 +387,8 @@ static inline int sem_lock(struct sem_array *sma, struct sembuf *sops,
*
* Both facts are tracked by use_global_mode.
*/
- sem = &sma->sems[sops->sem_num];
+ idx = array_index_nospec(sops->sem_num, sma->sem_nsems);
+ sem = &sma->sems[idx];
/*
* Initial check for use_global_lock. Just an optimization,
@@ -638,7 +641,8 @@ static int perform_atomic_semop_slow(struct sem_array *sma, struct sem_queue *q)
un = q->undo;
for (sop = sops; sop < sops + nsops; sop++) {
- curr = &sma->sems[sop->sem_num];
+ int idx = array_index_nospec(sop->sem_num, sma->sem_nsems);
+ curr = &sma->sems[idx];
sem_op = sop->sem_op;
result = curr->semval;
@@ -718,7 +722,9 @@ static int perform_atomic_semop(struct sem_array *sma, struct sem_queue *q)
* until the operations can go through.
*/
for (sop = sops; sop < sops + nsops; sop++) {
- curr = &sma->sems[sop->sem_num];
+ int idx = array_index_nospec(sop->sem_num, sma->sem_nsems);
+
+ curr = &sma->sems[idx];
sem_op = sop->sem_op;
result = curr->semval;
@@ -1356,6 +1362,7 @@ static int semctl_setval(struct ipc_namespace *ns, int semid, int semnum,
return -EIDRM;
}
+ semnum = array_index_nospec(semnum, sma->sem_nsems);
curr = &sma->sems[semnum];
ipc_assert_locked_object(&sma->sem_perm);
@@ -1509,6 +1516,8 @@ static int semctl_main(struct ipc_namespace *ns, int semid, int semnum,
err = -EIDRM;
goto out_unlock;
}
+
+ semnum = array_index_nospec(semnum, nsems);
curr = &sma->sems[semnum];
switch (cmd) {
@@ -2081,7 +2090,8 @@ static long do_semtimedop(int semid, struct sembuf __user *tsops,
*/
if (nsops == 1) {
struct sem *curr;
- curr = &sma->sems[sops->sem_num];
+ int idx = array_index_nospec(sops->sem_num, sma->sem_nsems);
+ curr = &sma->sems[idx];
if (alter) {
if (sma->complex_count) {
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