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ethtool: ignore unused/unreliable fields in set_eee op 

This function is used with the set_eee() ethtool operation. Certain
fields of struct ethtool_keee() are relevant only for the get_eee()
operation. In addition, in case of the ioctl interface, we have no
guarantee that userspace sends sane values in struct ethtool_eee.
Therefore explicitly ignore all fields not needed for set_eee().
This protects from drivers trying to use unchecked and unreliable
data, relying on specific userspace behavior.

Note: Such unsafe driver behavior has been found and fixed in the
tg3 driver.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/ad7ee11e-eb7a-4975-9122-547e13a161d8@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Heiner Kallweit 2024-03-02 15:18:27 +01:00 committed by Jakub Kicinski
parent ff73f8344e
commit 344f7a4651
1 changed files with 0 additions and 5 deletions
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5
net/ethtool/ioctl.c
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@ -1514,17 +1514,12 @@ static void eee_to_keee(struct ethtool_keee *keee,
{
memset(keee, 0, sizeof(*keee));
keee->eee_active = eee->eee_active;
keee->eee_enabled = eee->eee_enabled;
keee->tx_lpi_enabled = eee->tx_lpi_enabled;
keee->tx_lpi_timer = eee->tx_lpi_timer;
ethtool_convert_legacy_u32_to_link_mode(keee->supported,
eee->supported);
ethtool_convert_legacy_u32_to_link_mode(keee->advertised,
eee->advertised);
ethtool_convert_legacy_u32_to_link_mode(keee->lp_advertised,
eee->lp_advertised);
}
static void keee_to_eee(struct ethtool_eee *eee,