fix corrupt sysvipc timestamps on 32-bit archs with old kernels

[musl] / src / ipc / shmctl.c

diff --git a/src/ipc/shmctl.c b/src/ipc/shmctl.c
index de3ce9d..1c9f78c 100644 (file)
--- a/src/ipc/shmctl.c
+++ b/src/ipc/shmctl.c
@@ -9,6 +9,14 @@
 
 int shmctl(int id, int cmd, struct shmid_ds *buf)
 {
+#if IPC_TIME64
+       struct shmid_ds out, *orig;
+       if (cmd&IPC_TIME64) {
+               out = (struct shmid_ds){0};
+               orig = buf;
+               buf = &out;
+       }
+#endif
 #ifdef SYSCALL_IPC_BROKEN_MODE
        struct shmid_ds tmp;
        if (cmd == IPC_SET) {
@@ -32,6 +40,8 @@ int shmctl(int id, int cmd, struct shmid_ds *buf)
 #endif
 #if IPC_TIME64
        if (r >= 0 && (cmd&IPC_TIME64)) {
+               buf = orig;
+               *buf = out;
                IPC_HILO(buf, shm_atime);
                IPC_HILO(buf, shm_dtime);
                IPC_HILO(buf, shm_ctime);