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net/mlx4_core: Protect QUERY_PORT wrapper from untrusted guests

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The function mlx4_QUERY_PORT_wrapper implements only the
QUERY_PORT "general" case (opcode modifier = 0).

Verify that the opcode modifier is zero, and also that the
input modifier contains only the port number in bits 0..7
(all other bits should be zero).

Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jack Morgenstein 2014-09-30 12:03:49 +03:00 committed by David S. Miller
parent e1c00e10e9
commit a7401b9cf3
1 changed files with 7 additions and 2 deletions
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9
drivers/net/ethernet/mellanox/mlx4/fw.c
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@ -982,8 +982,13 @@ int mlx4_QUERY_PORT_wrapper(struct mlx4_dev *dev, int slave,
if (port < 0)
return -EINVAL;
vhcr->in_modifier = (vhcr->in_modifier & ~0xFF) |
(port & 0xFF);
/* Protect against untrusted guests: enforce that this is the
* QUERY_PORT general query.
*/
if (vhcr->op_modifier || vhcr->in_modifier & ~0xFF)
return -EINVAL;
vhcr->in_modifier = port;
err = mlx4_cmd_box(dev, 0, outbox->dma, vhcr->in_modifier, 0,
MLX4_CMD_QUERY_PORT, MLX4_CMD_TIME_CLASS_B,