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-rw-r--r--src/network/sendmsg.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/src/network/sendmsg.c b/src/network/sendmsg.c
index 80cc5f41..acdfdf29 100644
--- a/src/network/sendmsg.c
+++ b/src/network/sendmsg.c
@@ -8,13 +8,16 @@ ssize_t sendmsg(int fd, const struct msghdr *msg, int flags)
{
#if LONG_MAX > INT_MAX
struct msghdr h;
- struct cmsghdr chbuf[1024/sizeof(struct cmsghdr)+1], *c;
+ /* 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 > 1024) {
+ if (h.msg_controllen > sizeof chbuf) {
errno = ENOMEM;
return -1;
}