Messages in this thread Patch in this message | | | From | Dragos Tatulea <> | Subject | [PATCH 1/4] vdpa: Add features attr to vdpa_nl_policy for nlattr length check | Date | Thu, 27 Jul 2023 20:57:48 +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 the missing nla_policy for vdpa features attr to avoid such bugs.
Fixes: 90fea5a800c3 ("vdpa: device feature provisioning") Signed-off-by: Lin Ma <linma@zju.edu.cn> Cc: stable@vger.kernel.org --- drivers/vdpa/vdpa.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c index 965e32529eb8..3ad355a2208a 100644 --- a/drivers/vdpa/vdpa.c +++ b/drivers/vdpa/vdpa.c @@ -1249,6 +1249,7 @@ static const struct nla_policy vdpa_nl_policy[VDPA_ATTR_MAX + 1] = { [VDPA_ATTR_DEV_NET_CFG_MACADDR] = NLA_POLICY_ETH_ADDR, /* 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_FEATURES] = { .type = NLA_U64 }, }; static const struct genl_ops vdpa_nl_ops[] = { -- 2.41.0
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