From: Joe Damato <joe@dama.to>
To: Jakub Kicinski <kuba@kernel.org>
Cc: davem@davemloft.net, netdev@vger.kernel.org, edumazet@google.com,
pabeni@redhat.com, andrew+netdev@lunn.ch, horms@kernel.org,
florian.fainelli@broadcom.com, jonas.gorski@gmail.com,
andrew@lunn.ch, olteanv@gmail.com
Subject: Re: [PATCH net 5/5] ethtool: document that GRXCLSRLALL rule_cnt is a caller-provided limit
Date: Thu, 3 Sep 2026 13:16:43 -0700 [thread overview]
Message-ID: <apnVq3iQZeK2uy9t@devvm20253.cco0.facebook.com> (raw)
In-Reply-To: <20260903032611.3000029-6-kuba@kernel.org>
On Wed, Sep 02, 2026 at 08:26:11PM -0700, Jakub Kicinski wrote:
> Three drivers have shipped a get_rxnfc() which dumps its entire rule
> table into rule_locs, reading rule_cnt as "how many rules do I have"
> rather than "how many entries did the caller allocate". Nothing in the
> callback's documentation contradicted that reading. The distinction only
> matters because the ioctl lets an unprivileged caller pick rule_cnt
> directly, so getting it wrong is a heap overflow rather than a truncated
> dump.
>
> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
> ---
> CC: andrew@lunn.ch
> ---
> include/linux/ethtool.h | 6 ++++++
> 1 file changed, 6 insertions(+)
>
Reviewed-by: Joe Damato <joe@dama.to>
prev parent reply other threads:[~2026-09-03 20:16 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-03 3:26 [PATCH net 0/5] eth: fix bugs in ntuple filter reporting Jakub Kicinski
2026-09-03 3:26 ` [PATCH net 1/5] net: dsa: bcm_sf2: bound the CFP rule dump by the caller's buffer size Jakub Kicinski
2026-09-03 8:30 ` Jonas Gorski
2026-09-03 15:24 ` Florian Fainelli
2026-09-03 20:12 ` Joe Damato
2026-09-03 3:26 ` [PATCH net 2/5] eth: nfp: bound the ntuple " Jakub Kicinski
2026-09-03 20:14 ` Joe Damato
2026-09-03 3:26 ` [PATCH net 3/5] eth: nfp: drop the replaced rule from the list when reprogramming fails Jakub Kicinski
2026-09-03 20:32 ` Joe Damato
2026-09-03 3:26 ` [PATCH net 4/5] net: dsa: mv88e6xxx: bound the policy rule dump by the caller's buffer size Jakub Kicinski
2026-09-03 20:20 ` Joe Damato
2026-09-03 3:26 ` [PATCH net 5/5] ethtool: document that GRXCLSRLALL rule_cnt is a caller-provided limit Jakub Kicinski
2026-09-03 20:16 ` Joe Damato [this message]
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