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Message-ID: <20231009-strncpy-drivers-net-dsa-qca-qca8k-common-c-v1-1-34c8040e0f32@google.com>
Date: Mon, 09 Oct 2023 18:34:45 +0000
From: Justin Stitt <justinstitt@...gle.com>
To: Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>,
Vladimir Oltean <olteanv@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-hardening@...r.kernel.org,
Justin Stitt <justinstitt@...gle.com>
Subject: [PATCH] net: dsa: qca8k: replace deprecated strncpy with ethtool_sprintf
`strncpy` is deprecated for use on NUL-terminated destination strings
[1] and as such we should prefer more robust and less ambiguous string
interfaces.
ethtool_sprintf() is designed specifically for get_strings() usage.
Let's replace strncpy in favor of this more robust and easier to
understand interface.
Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
Link: https://github.com/KSPP/linux/issues/90
Cc: linux-hardening@...r.kernel.org
Signed-off-by: Justin Stitt <justinstitt@...gle.com>
---
Note: build-tested only.
---
drivers/net/dsa/qca/qca8k-common.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/net/dsa/qca/qca8k-common.c b/drivers/net/dsa/qca/qca8k-common.c
index fce04ce12cf9..9ff0a3c1cb91 100644
--- a/drivers/net/dsa/qca/qca8k-common.c
+++ b/drivers/net/dsa/qca/qca8k-common.c
@@ -487,8 +487,7 @@ void qca8k_get_strings(struct dsa_switch *ds, int port, u32 stringset,
return;
for (i = 0; i < priv->info->mib_count; i++)
- strncpy(data + i * ETH_GSTRING_LEN, ar8327_mib[i].name,
- ETH_GSTRING_LEN);
+ ethtool_sprintf(&data, "%s", ar8327_mib[i].name);
}
void qca8k_get_ethtool_stats(struct dsa_switch *ds, int port,
---
base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2
change-id: 20231009-strncpy-drivers-net-dsa-qca-qca8k-common-c-dd2c84b23bdf
Best regards,
--
Justin Stitt <justinstitt@...gle.com>
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