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Date: Wed, 2 Jun 2021 12:46:46 -0700 From: Rao Shoaib <rao.shoaib@...cle.com> To: Kees Cook <keescook@...omium.org>, Jay Vosburgh <j.vosburgh@...il.com> Cc: kernel test robot <lkp@...el.com>, Veaceslav Falico <vfalico@...il.com>, Andy Gospodarek <andy@...yhouse.net>, "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, linux-hardening@...r.kernel.org Subject: Re: [PATCH] net: bonding: Use strscpy() instead of manually-truncated strncpy() Would it make sense to also replace the other strncpy in the same file. Shoaib On 6/2/21 11:11 AM, Kees Cook wrote: > Silence this warning by just using strscpy() 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); > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > Reported-by: kernel test robot <lkp@...el.com> > Link: https://lore.kernel.org/lkml/202102150705.fdR6obB0-lkp@intel.com > Signed-off-by: Kees Cook <keescook@...omium.org> > --- > drivers/net/bonding/bond_main.c | 6 ++---- > 1 file changed, 2 insertions(+), 4 deletions(-) > > diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c > index c5a646d06102..ecfc48f2d0d0 100644 > --- a/drivers/net/bonding/bond_main.c > +++ b/drivers/net/bonding/bond_main.c > @@ -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(params->primary, primary, sizeof(params->primary)); > > memcpy(params->arp_targets, arp_target, sizeof(arp_target)); >
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