Messages in this thread Patch in this message | | | From | Dragos Tatulea <> | Subject | [PATCH 1/2] vdpa: Complement vdpa_nl_policy for nlattr length check | Date | Wed, 26 Jul 2023 21:30:50 +0300 |
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From: Lin Ma <linma@zju.edu.cn>
The vdpa_nl_policy structure is used to validate the nlattr when parsing the incoming nlmsg. It will ensure the attribute being described produces a valid nlattr pointer in info->attrs before entering into each handler in vdpa_nl_ops.
That is to say, the missing part in vdpa_nl_policy may lead to illegal nlattr after parsing, which could lead to OOB read just like CVE-2023-3773.
This patch adds three missing nla_policy to avoid such bugs.
Fixes: 90fea5a800c3 ("vdpa: device feature provisioning") Fixes: 13b00b135665 ("vdpa: Add support for querying vendor statistics") Fixes: ad69dd0bf26b ("vdpa: Introduce query of device config layout") Signed-off-by: Lin Ma <linma@zju.edu.cn> --- drivers/vdpa/vdpa.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c index 965e32529eb8..f2f654fd84e5 100644 --- a/drivers/vdpa/vdpa.c +++ b/drivers/vdpa/vdpa.c @@ -1247,8 +1247,11 @@ static const struct nla_policy vdpa_nl_policy[VDPA_ATTR_MAX + 1] = { [VDPA_ATTR_MGMTDEV_DEV_NAME] = { .type = NLA_STRING }, [VDPA_ATTR_DEV_NAME] = { .type = NLA_STRING }, [VDPA_ATTR_DEV_NET_CFG_MACADDR] = NLA_POLICY_ETH_ADDR, + [VDPA_ATTR_DEV_NET_CFG_MAX_VQP] = { .type = NLA_U16 }, /* virtio spec 1.1 section 5.1.4.1 for valid MTU range */ [VDPA_ATTR_DEV_NET_CFG_MTU] = NLA_POLICY_MIN(NLA_U16, 68), + [VDPA_ATTR_DEV_QUEUE_INDEX] = { .type = NLA_U32 }, + [VDPA_ATTR_DEV_FEATURES] = { .type = NLA_U64 }, }; static const struct genl_ops vdpa_nl_ops[] = { -- 2.41.0
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