linux-kernel - [PATCH v2] NFSD: Remove all occurences of strlcpy

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Message-ID: <20230512145356.396567-1-azeemshaikh38@gmail.com>
Date:   Fri, 12 May 2023 14:53:56 +0000
From:   Azeem Shaikh <azeemshaikh38@...il.com>
To:     Chuck Lever <chuck.lever@...cle.com>,
        Jeff Layton <jlayton@...nel.org>
Cc:     linux-hardening@...r.kernel.org, keescook@...omium.org,
        Azeem Shaikh <azeemshaikh38@...il.com>,
        linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] NFSD: Remove all occurences of strlcpy

strlcpy() reads the entire source buffer first.
This read may exceed the destination size limit.
This is both inefficient and can lead to linear read
overflows if a source string is not NUL-terminated [1].
In an effort to remove strlcpy() completely [2], replace
strlcpy here.

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
[2] https://github.com/KSPP/linux/issues/89

Fixes: 3c92fba557c6 ("NFSD: Enhance the nfsd_cb_setup tracepoint")
Signed-off-by: Azeem Shaikh <azeemshaikh38@...il.com>
---
v1: https://lore.kernel.org/all/20230510220952.3507366-1-azeemshaikh38@gmail.com/

Changes in v2:
 - Use __assign_str instead of strscpy.
 - Added the Fixes tag.

 fs/nfsd/trace.h |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

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))
 );
 
 TRACE_EVENT(nfsd_cb_setup_err,
-- 
2.40.1.606.ga4b1b128d6-goog