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authorLin Ma <linma@zju.edu.cn>2023-07-03 19:08:42 +0800
committerPaolo Abeni <pabeni@redhat.com>2023-07-04 10:31:38 +0200
commit30c45b5361d39b4b793780ffac5538090b9e2eb1 (patch)
tree95f2b5b0bbd2cef0e97f449bb92d39ec417f6f88 /net/sched
parent2c5d234d7f55e4ba7f3ee00fb9452ac7c97b4a46 (diff)
net/sched: act_pedit: Add size check for TCA_PEDIT_PARMS_EX
The attribute TCA_PEDIT_PARMS_EX is not be included in pedit_policy and one malicious user could fake a TCA_PEDIT_PARMS_EX whose length is smaller than the intended sizeof(struct tc_pedit). Hence, the dereference in tcf_pedit_init() could access dirty heap data. static int tcf_pedit_init(...) { // ... pattr = tb[TCA_PEDIT_PARMS]; // TCA_PEDIT_PARMS is included if (!pattr) pattr = tb[TCA_PEDIT_PARMS_EX]; // but this is not // ... parm = nla_data(pattr); index = parm->index; // parm is able to be smaller than 4 bytes // and this dereference gets dirty skb_buff // data created in netlink_sendmsg } This commit adds TCA_PEDIT_PARMS_EX length in pedit_policy which avoid the above case, just like the TCA_PEDIT_PARMS. Fixes: 71d0ed7079df ("net/act_pedit: Support using offset relative to the conventional network headers") Signed-off-by: Lin Ma <linma@zju.edu.cn> Reviewed-by: Pedro Tammela <pctammela@mojatatu.com> Link: https://lore.kernel.org/r/20230703110842.590282-1-linma@zju.edu.cn Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'net/sched')
-rw-r--r--net/sched/act_pedit.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/sched/act_pedit.c b/net/sched/act_pedit.c
index b562fc2bb5b1..1ef8fcfa9997 100644
--- a/net/sched/act_pedit.c
+++ b/net/sched/act_pedit.c
@@ -29,6 +29,7 @@ static struct tc_action_ops act_pedit_ops;
static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = {
[TCA_PEDIT_PARMS] = { .len = sizeof(struct tc_pedit) },
+ [TCA_PEDIT_PARMS_EX] = { .len = sizeof(struct tc_pedit) },
[TCA_PEDIT_KEYS_EX] = { .type = NLA_NESTED },
};