netdev - [PATCH] net: qcom/emac: Replace strlcpy with strscpy

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20210906135653.109449-1-wangborong@cdjrlc.com>
Date:   Mon,  6 Sep 2021 21:56:53 +0800
From:   Jason Wang <wangborong@...rlc.com>
To:     davem@...emloft.net
Cc:     timur@...nel.org, kuba@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jason Wang <wangborong@...rlc.com>
Subject: [PATCH] net: qcom/emac: Replace strlcpy with strscpy

The strlcpy should not be used because it doesn't limit the source
length. As linus says, it's a completely useless function if you
can't implicitly trust the source string - but that is almost always
why people think they should use it! All in all the BSD function
will lead some potential bugs.

But the strscpy doesn't require reading memory from the src string
beyond the specified "count" bytes, and since the return value is
easier to error-check than strlcpy()'s. In addition, the implementation
is robust to the string changing out from underneath it, unlike the
current strlcpy() implementation.

Thus, We prefer using strscpy instead of strlcpy.

Signed-off-by: Jason Wang <wangborong@...rlc.com>
---
 drivers/net/ethernet/qualcomm/emac/emac-ethtool.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/qualcomm/emac/emac-ethtool.c b/drivers/net/ethernet/qualcomm/emac/emac-ethtool.c
index 79e50079ed03..f72e13b83869 100644
--- a/drivers/net/ethernet/qualcomm/emac/emac-ethtool.c
+++ b/drivers/net/ethernet/qualcomm/emac/emac-ethtool.c
@@ -100,7 +100,7 @@ static void emac_get_strings(struct net_device *netdev, u32 stringset, u8 *data)

 	case ETH_SS_STATS:
 		for (i = 0; i < EMAC_STATS_LEN; i++) {
-			strlcpy(data, emac_ethtool_stat_strings[i],
+			strscpy(data, emac_ethtool_stat_strings[i],
 				ETH_GSTRING_LEN);
 			data += ETH_GSTRING_LEN;
 		}
-- 
2.33.0