From: Kees Cook <keescook@chromium.org>
To: Jay Vosburgh <j.vosburgh@gmail.com>
Cc: Kees Cook <keescook@chromium.org>,
kernel test robot <lkp@intel.com>,
Veaceslav Falico <vfalico@gmail.com>,
Andy Gospodarek <andy@greyhouse.net>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
linux-hardening@vger.kernel.org
Subject: [PATCH v2] net: bonding: Use strscpy() instead of manually-truncated strncpy()
Date: Wed, 2 Jun 2021 13:31:38 -0700 [thread overview]
Message-ID: <20210602203138.4082470-1-keescook@chromium.org> (raw)
Silence this warning by just using strscpy_pad() directly:
>> drivers/net/bonding/bond_main.c:4877:3: warning: 'strncpy' specified bound 16 equals destination size [-Wstringop-truncation]
4877 | strncpy(params->primary, primary, IFNAMSIZ);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Additionally replace other strncpy() uses, as it is considered deprecated:
https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/lkml/202102150705.fdR6obB0-lkp@intel.com
Signed-off-by: Kees Cook <keescook@chromium.org>
---
v2:
- switch to strscpy_pad() and replace earlier strncpy() too
v1: https://lore.kernel.org/lkml/20210602181133.3326856-1-keescook@chromium.org
---
drivers/net/bonding/bond_main.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index c5a646d06102..e9cb716ad849 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -620,7 +620,7 @@ static int bond_check_dev_link(struct bonding *bond,
*/
/* Yes, the mii is overlaid on the ifreq.ifr_ifru */
- strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
+ strscpy_pad(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
mii = if_mii(&ifr);
if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
mii->reg_num = MII_BMSR;
@@ -5329,10 +5329,8 @@ static int bond_check_params(struct bond_params *params)
(struct reciprocal_value) { 0 };
}
- if (primary) {
- strncpy(params->primary, primary, IFNAMSIZ);
- params->primary[IFNAMSIZ - 1] = 0;
- }
+ if (primary)
+ strscpy_pad(params->primary, primary, sizeof(params->primary));
memcpy(params->arp_targets, arp_target, sizeof(arp_target));
--
2.25.1
next reply other threads:[~2021-06-02 20:32 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-02 20:31 Kees Cook [this message]
2021-06-02 20:47 ` [PATCH v2] net: bonding: Use strscpy() instead of manually-truncated strncpy() Jay Vosburgh
2021-06-02 20:52 ` Kees Cook
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