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a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1701416031; x=1732952031; h=message-id:date:subject:to:cc:references:from: in-reply-to:content-transfer-encoding:mime-version; bh=MBqswBM/jeKSbkliBgNnESrheB4f4qUWeSM3OJtnGPY=; b=jdG4GQyPcm9kjX4zMAwS6Y06Z616YsQMQGA/9dSs4fzQlcJjpjoPUlDk zOZUDyydGB7WBQrqksIbmiZ/nutYdiDv1xTPVjD6SOdt9Fn0newWQspsC eWMlcZ7EK5Vwe1xeBR/oT0mTxdIXf7zAT8TEaAFVqlSlR0wvQSki2l8nW B+YPhL5hOMlwXtl0dnVTTkat1ZKddyKEw5t2ieZ8Xc09chZW318Bhg6Bd qnG/PV9LNuQuzNbzriAgGwQOpQObJJDfAAuHdoLVwIPUAVGviwQTk35Gq 9zaJ+Vh3PGMSq/XkaroKNkA+62+ZJohmjI6EKlFmfMZ/m+KyVGTflxwt0 w==; X-Mailman-Original-Authentication-Results: smtp2.osuosl.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=jdG4GQyP X-Mailman-Original-Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=intel.com; Subject: Re: [Intel-wired-lan] [PATCH net] ice: fix theoretical out-of-bounds access in ethtool link modes X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Tony Nguyen , Paul Greenwalt , intel-wired-lan@lists.osuosl.org, Jesse Brandeburg Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" On 11/30/23 17:58, Michal Schmidt wrote: > To map phy types reported by the hardware to ethtool link mode bits, > ice uses two lookup tables (phy_type_low_lkup, phy_type_high_lkup). > The "low" table has 64 elements to cover every possible bit the hardware > may report, but the "high" table has only 13. If the hardware reports a > higher bit in phy_types_high, the driver would access memory beyond the > lookup table's end. > > Instead of iterating through all 64 bits of phy_types_{low,high}, use > the sizes of the respective lookup tables. > > Fixes: 9136e1f1e5c3 ("ice: refactor PHY type to ethtool link mode") > Signed-off-by: Michal Schmidt > --- > drivers/net/ethernet/intel/ice/ice_ethtool.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/net/ethernet/intel/ice/ice_ethtool.c b/drivers/net/ethernet/intel/ice/ice_ethtool.c > index a34083567e6f..bde9bc74f928 100644 > --- a/drivers/net/ethernet/intel/ice/ice_ethtool.c > +++ b/drivers/net/ethernet/intel/ice/ice_ethtool.c > @@ -1850,14 +1850,14 @@ ice_phy_type_to_ethtool(struct net_device *netdev, > linkmode_zero(ks->link_modes.supported); > linkmode_zero(ks->link_modes.advertising); > > - for (i = 0; i < BITS_PER_TYPE(u64); i++) { > + for (i = 0; i < ARRAY_SIZE(phy_type_low_lkup); i++) { > if (phy_types_low & BIT_ULL(i)) > ice_linkmode_set_bit(&phy_type_low_lkup[i], ks, > req_speeds, advert_phy_type_lo, > i); > } > > - for (i = 0; i < BITS_PER_TYPE(u64); i++) { > + for (i = 0; i < ARRAY_SIZE(phy_type_high_lkup); i++) { > if (phy_types_high & BIT_ULL(i)) > ice_linkmode_set_bit(&phy_type_high_lkup[i], ks, > req_speeds, advert_phy_type_hi, I guess that that "HW reported" number really goes through the FW in some way, so one could indeed spoil that in some way, what makes sense to target it at -net. Reviewed-by: Przemek Kitszel _______________________________________________ Intel-wired-lan mailing list Intel-wired-lan@osuosl.org https://lists.osuosl.org/mailman/listinfo/intel-wired-lan