linux-hardening - Re: [PATCH] NFSD: Replace all non-returning strlcpy with strscpy

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Date:   Fri, 12 May 2023 10:30:34 -0400
From:   Azeem Shaikh <azeemshaikh38@...il.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Chuck Lever III <chuck.lever@...cle.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Jeff Layton <jlayton@...nel.org>,
        "linux-hardening@...r.kernel.org" <linux-hardening@...r.kernel.org>,
        Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] NFSD: Replace all non-returning strlcpy with strscpy

Thanks Chuck and Kees for the review.

> > Actually netid should use the __string() and __assign_str()
> > macros rather than open-coding a string copy, I think.

Do you mean something like this?

diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index 4183819ea082..72a906a053dc 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -1365,19 +1365,19 @@ TRACE_EVENT(nfsd_cb_setup,
                __field(u32, cl_id)
                __field(unsigned long, authflavor)
                __sockaddr(addr, clp->cl_cb_conn.cb_addrlen)
-               __array(unsigned char, netid, 8)
+               __string(netid, netid)
        ),
        TP_fast_assign(
                __entry->cl_boot = clp->cl_clientid.cl_boot;
                __entry->cl_id = clp->cl_clientid.cl_id;
-               strlcpy(__entry->netid, netid, sizeof(__entry->netid));
+               __assign_str(netid, netid);
                __entry->authflavor = authflavor;
                __assign_sockaddr(addr, &clp->cl_cb_conn.cb_addr,
                                  clp->cl_cb_conn.cb_addrlen)
        ),
        TP_printk("addr=%pISpc client %08x:%08x proto=%s flavor=%s",
                __get_sockaddr(addr), __entry->cl_boot, __entry->cl_id,
-               __entry->netid, show_nfsd_authflavor(__entry->authflavor))
+               __get_str(netid), show_nfsd_authflavor(__entry->authflavor))
 );

> > Fixes: 3c92fba557c6 ("NFSD: Enhance the nfsd_cb_setup tracepoint")

Ack.