Author: tuexen
Date: Wed Jan 16 11:33:47 2019
New Revision: 343089
URL: https://svnweb.freebsd.org/changeset/base/343089
Log:
Limit the user-controllable amount of memory the kernel allocates
via IPPROTO_SCTP level socket options.
This issue was found by running syzkaller.
MFC after: 1 week
Modified:
head/sys/netinet/sctp_constants.h
head/sys/netinet/sctp_usrreq.c
Modified: head/sys/netinet/sctp_constants.h
==============================================================================
--- head/sys/netinet/sctp_constants.h Wed Jan 16 10:33:51 2019
(r343088)
+++ head/sys/netinet/sctp_constants.h Wed Jan 16 11:33:47 2019
(r343089)
@@ -983,6 +983,9 @@ __FBSDID("$FreeBSD$");
((((uint8_t *)&(a)->s_addr)[0] == 169) && \
(((uint8_t *)&(a)->s_addr)[1] == 254))
+/* Maximum size of optval for IPPROTO_SCTP level socket options. */
+#define SCTP_SOCKET_OPTION_LIMIT (64 * 1024)
+
#if defined(_KERNEL)
#define SCTP_GETTIME_TIMEVAL(x) (getmicrouptime(x))
Modified: head/sys/netinet/sctp_usrreq.c
==============================================================================
--- head/sys/netinet/sctp_usrreq.c Wed Jan 16 10:33:51 2019
(r343088)
+++ head/sys/netinet/sctp_usrreq.c Wed Jan 16 11:33:47 2019
(r343089)
@@ -6828,6 +6828,10 @@ sctp_ctloutput(struct socket *so, struct sockopt *sopt
return (error);
}
optsize = sopt->sopt_valsize;
+ if (optsize > SCTP_SOCKET_OPTION_LIMIT) {
+ SCTP_LTRACE_ERR_RET(so->so_pcb, NULL, NULL,
SCTP_FROM_SCTP_USRREQ, ENOBUFS);
+ return (ENOBUFS);
+ }
if (optsize) {
SCTP_MALLOC(optval, void *, optsize, SCTP_M_SOCKOPT);
if (optval == NULL) {
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