X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fnetwork%2Fsendmsg.c;h=acdfdf29247f0f5a48e713e964ea1fc09f47cd7f;hb=595416b11dfbc82d40a59d0edd7e3b04ba7a2d6d;hp=164c28d72a0e40e1b83d1ee6d423437e7d95236b;hpb=feee98903cd8119d9a3db62589246a940f44a9f5;p=musl

diff --git a/src/network/sendmsg.c b/src/network/sendmsg.c
index 164c28d7..acdfdf29 100644
--- a/src/network/sendmsg.c
+++ b/src/network/sendmsg.c
@@ -1,16 +1,31 @@
 #include <sys/socket.h>
 #include <limits.h>
+#include <string.h>
+#include <errno.h>
 #include "syscall.h"
-#include "libc.h"
 
 ssize_t sendmsg(int fd, const struct msghdr *msg, int flags)
 {
 #if LONG_MAX > INT_MAX
 	struct msghdr h;
+	/* Kernels before 2.6.38 set SCM_MAX_FD to 255, allocate enough
+	 * space to support an SCM_RIGHTS ancillary message with 255 fds.
+	 * Kernels since 2.6.38 set SCM_MAX_FD to 253. */
+	struct cmsghdr chbuf[CMSG_SPACE(255*sizeof(int))/sizeof(struct cmsghdr)+1], *c;
 	if (msg) {
 		h = *msg;
 		h.__pad1 = h.__pad2 = 0;
 		msg = &h;
+		if (h.msg_controllen) {
+			if (h.msg_controllen > sizeof chbuf) {
+				errno = ENOMEM;
+				return -1;
+			}
+			memcpy(chbuf, h.msg_control, h.msg_controllen);
+			h.msg_control = chbuf;
+			for (c=CMSG_FIRSTHDR(&h); c; c=CMSG_NXTHDR(&h,c))
+				c->__pad1 = 0;
+		}
 	}
 #endif
 	return socketcall_cp(sendmsg, fd, msg, flags, 0, 0, 0);