netdev - Fw: [Bug 205681] New: recvmg is overwriting the buffer passed in msg_name by exceeding msg

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Message-ID: <20191127080850.2707eef0@hermes.lan>
Date:   Wed, 27 Nov 2019 08:08:50 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     netdev@...r.kernel.org
Subject: Fw: [Bug 205681] New: recvmg is overwriting the buffer passed in
 msg_name by exceeding msg_namelen



Begin forwarded message:

Date: Wed, 27 Nov 2019 06:36:50 +0000
From: bugzilla-daemon@...zilla.kernel.org
To: stephen@...workplumber.org
Subject: [Bug 205681] New: recvmg is overwriting the buffer passed in msg_name by exceeding msg_namelen


https://bugzilla.kernel.org/show_bug.cgi?id=205681

            Bug ID: 205681
           Summary: recvmg is overwriting the buffer passed in msg_name by
                    exceeding msg_namelen
           Product: Networking
           Version: 2.5
    Kernel Version: 5.4,4.0,3.0,2.6
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: IPV4
          Assignee: stephen@...workplumber.org
          Reporter: sudheendrasp@...il.com
        Regression: No

if (msg->msg_name) {
        struct sockaddr_rxrpc *srx = msg->msg_name;
        size_t len = sizeof(call->peer->srx);

        memcpy(msg->msg_name, &call->peer->srx, len);
        srx->srx_service = call->service_id;
        msg->msg_namelen = len;
    }


As seen, recvmsg is doing memcpy of len which can be greater than msg_namelen
passed.

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