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Message-ID: <202310091155.3E4328DC1B@keescook> Date: Mon, 9 Oct 2023 11:56:33 -0700 From: Kees Cook <keescook@...omium.org> To: Justin Stitt <justinstitt@...gle.com> Cc: Arınç ÜNAL <arinc.unal@...nc9.com>, Daniel Golle <daniel@...rotopia.org>, Landen Chao <Landen.Chao@...iatek.com>, DENG Qingfang <dqfext@...il.com>, Sean Wang <sean.wang@...iatek.com>, 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>, Matthias Brugger <matthias.bgg@...il.com>, AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org, linux-hardening@...r.kernel.org Subject: Re: [PATCH] net: dsa: mt7530: replace deprecated strncpy with ethtool_sprintf On Mon, Oct 09, 2023 at 11:31:46AM -0700, Kees Cook wrote: > On Mon, Oct 09, 2023 at 06:29:19PM +0000, Justin Stitt wrote: > > `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/mt7530.c | 3 +-- > > 1 file changed, 1 insertion(+), 2 deletions(-) > > > > diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c > > index 035a34b50f31..e00126af8318 100644 > > --- a/drivers/net/dsa/mt7530.c > > +++ b/drivers/net/dsa/mt7530.c > > @@ -836,8 +836,7 @@ mt7530_get_strings(struct dsa_switch *ds, int port, u32 stringset, > > return; > > > > for (i = 0; i < ARRAY_SIZE(mt7530_mib); i++) > > - strncpy(data + i * ETH_GSTRING_LEN, mt7530_mib[i].name, > > - ETH_GSTRING_LEN); > > + ethtool_sprintf(&data, "%s", mt7530_mib[i].name); > > Err, wait, I spoke too soon. Shouldn't this be "data" and not "&data"? Ugh, ignore me. I keep forgetting that ethtool_sprintf() updates the "data" pointer. My original Reviewed-by is fine. :) -Kees -- Kees Cook
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