Messages in this thread Patch in this message | ![/](/images/icornerl.gif) | | Date | Tue, 9 Apr 2024 10:58:41 +0200 | Subject | Re: [PATCH v3] net: dsa: lan9303: use ethtool_puts() for lan9303_get_strings() | From | Alexander Lobakin <> |
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From: Justin Stitt <justinstitt@google.com> Date: Mon, 08 Apr 2024 21:01:57 +0000
> This pattern of strncpy with some pointer arithmetic setting fixed-sized > intervals with string literal data is a bit weird so let's use > ethtool_puts() as this has more obvious behavior and is less-error > prone. > > Nicely, we also get to drop a usage of the now deprecated strncpy() [1]. > > Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1] > Link: https://github.com/KSPP/linux/issues/90 > Cc: linux-hardening@vger.kernel.org > Cc: Kees Cook <keescook@chromium.org> > Signed-off-by: Justin Stitt <justinstitt@google.com> > Suggested-by: Alexander Lobakin <aleksander.lobakin@intel.com> > --- > Changes in v3: > - use ethtool_puts over ethtool_sprintf > - Link to v2: https://lore.kernel.org/r/20231005-strncpy-drivers-net-dsa-lan9303-core-c-v2-1-feb452a532db@google.com > > Changes in v2: > - use ethtool_sprintf (thanks Alexander) > - Link to v1: https://lore.kernel.org/r/20231005-strncpy-drivers-net-dsa-lan9303-core-c-v1-1-5a66c538147e@google.com > --- > drivers/net/dsa/lan9303-core.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/net/dsa/lan9303-core.c b/drivers/net/dsa/lan9303-core.c > index fcb20eac332a..04d3af0eb28e 100644 > --- a/drivers/net/dsa/lan9303-core.c > +++ b/drivers/net/dsa/lan9303-core.c > @@ -1007,14 +1007,14 @@ static const struct lan9303_mib_desc lan9303_mib[] = { > static void lan9303_get_strings(struct dsa_switch *ds, int port, > u32 stringset, uint8_t *data) > { > + u8 *buf = data; > unsigned int u; > > if (stringset != ETH_SS_STATS) > return; > > for (u = 0; u < ARRAY_SIZE(lan9303_mib); u++) { > - strncpy(data + u * ETH_GSTRING_LEN, lan9303_mib[u].name, > - ETH_GSTRING_LEN); > + ethtool_puts(&buf, lan9303_mib[u].name); > }
The braces { } around ethtool_puts() aren't needed anymore.
> } > > > --- > base-commit: c85af715cac0a951eea97393378e84bb49384734 > change-id: 20231005-strncpy-drivers-net-dsa-lan9303-core-c-6386858e5c22 > > Best regards, > -- > Justin Stitt <justinstitt@google.com>
Thanks, Olek
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