X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=blobdiff_plain;f=src%2Fipc%2Fsemget.c;h=c4a559db1b0ec1316dc2fa9bc47a538ea552d94a;hp=2dcf6eac5f279913c47cf937f98e9b5f216abb89;hb=062f40ef3e56021f4a9902095867e35cce6d99c4;hpb=0b44a0315b47dd8eced9f3b7f31580cf14bbfc01

diff --git a/src/ipc/semget.c b/src/ipc/semget.c
index 2dcf6eac..c4a559db 100644
--- a/src/ipc/semget.c
+++ b/src/ipc/semget.c
@@ -1,12 +1,19 @@
 #include <sys/sem.h>
+#include <limits.h>
+#include <errno.h>
 #include "syscall.h"
 #include "ipc.h"
 
 int semget(key_t key, int n, int fl)
 {
-#ifdef __NR_semget
-	return syscall3(__NR_semget, key, n, fl);
+	/* The kernel uses the wrong type for the sem_nsems member
+	 * of struct semid_ds, and thus might not check that the
+	 * n fits in the correct (per POSIX) userspace type, so
+	 * we have to check here. */
+	if (n > USHRT_MAX) return __syscall_ret(-EINVAL);
+#ifdef SYS_semget
+	return syscall(SYS_semget, key, n, fl);
 #else
-	return syscall4(__NR_ipc, IPCOP_semget, key, n, fl);
+	return syscall(SYS_ipc, IPCOP_semget, key, n, fl);
 #endif
 }