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Merge branch 'forbid-goto_chain-fallback'

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Davide Caratti says:

====================
net/sched: forbid 'goto_chain' on fallback actions

the following command:

 # tc actions add action police rate 1mbit burst 1k conform-exceed \
 > pass / goto chain 42

generates a NULL pointer dereference when packets exceed the configured
rate. Similarly, the following command:

 # tc actions add action pass random determ goto chain 42 2

makes the kernel crash with NULL dereference when the first packet does
not match the 'pass' action.

gact and police allow users to specify a fallback control action, that is
stored in the action private data. 'goto chain x' never worked for these
cases, since a->goto_chain handle was never initialized. There is only one
goto_chain handle per TC action, and it is designed to be non-NULL only if
tcf_action contains a 'goto chain' command. So, let's forbid 'goto chain'
on fallback actions.

Patch 1/4 and 2/4 change the .init() functions of police and gact, to let
them return an error when users try to set 'goto chain x' in the fallback
action. Patch 3/4 and 4/4 add TDC selftest coverage to this new behavior.
====================

Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2018-10-22 19:42:58 -07:00
commit ec7f0ee2c1
4 changed files with 63 additions and 2 deletions
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5
net/sched/act_gact.c
View File

@ -88,6 +88,11 @@ static int tcf_gact_init(struct net *net, struct nlattr *nla,
p_parm = nla_data(tb[TCA_GACT_PROB]);
if (p_parm->ptype >= MAX_RAND)
return -EINVAL;
if (TC_ACT_EXT_CMP(p_parm->paction, TC_ACT_GOTO_CHAIN)) {
NL_SET_ERR_MSG(extack,
"goto chain not allowed on fallback");
return -EINVAL;
}
}
#endif

12
net/sched/act_police.c
View File

@ -185,8 +185,6 @@ static int tcf_police_init(struct net *net, struct nlattr *nla,
new->peak_present = false;
}
if (tb[TCA_POLICE_RESULT])
new->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
new->tcfp_burst = PSCHED_TICKS2NS(parm->burst);
new->tcfp_toks = new->tcfp_burst;
if (new->peak_present) {
@ -198,6 +196,16 @@ static int tcf_police_init(struct net *net, struct nlattr *nla,
if (tb[TCA_POLICE_AVRATE])
new->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
if (tb[TCA_POLICE_RESULT]) {
new->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
if (TC_ACT_EXT_CMP(new->tcfp_result, TC_ACT_GOTO_CHAIN)) {
NL_SET_ERR_MSG(extack,
"goto chain not allowed on fallback");
err = -EINVAL;
goto failure;
}
}
spin_lock_bh(&police->tcf_lock);
new->tcfp_t_c = ktime_get_ns();
police->tcf_action = parm->action;

24
tools/testing/selftests/tc-testing/tc-tests/actions/gact.json
View File

@ -536,5 +536,29 @@
"matchPattern": "^[ \t]+index [0-9]+ ref",
"matchCount": "0",
"teardown": []
},
{
"id": "8e47",
"name": "Add gact action with random determ goto chain control action",
"category": [
"actions",
"gact"
],
"setup": [
[
"$TC actions flush action gact",
0,
1,
255
]
],
"cmdUnderTest": "$TC actions add action pass random determ goto chain 1 2 index 90",
"expExitCode": "255",
"verifyCmd": "$TC actions list action gact",
"matchPattern": "action order [0-9]*: gact action pass random type determ goto chain 1 val 2.*index 90 ref",
"matchCount": "0",
"teardown": [
"$TC actions flush action gact"
]
}
]

24
tools/testing/selftests/tc-testing/tc-tests/actions/police.json
View File

@ -715,5 +715,29 @@
"teardown": [
"$TC actions flush action police"
]
},
{
"id": "b48b",
"name": "Add police action with exceed goto chain control action",
"category": [
"actions",
"police"
],
"setup": [
[
"$TC actions flush action police",
0,
1,
255
]
],
"cmdUnderTest": "$TC actions add action police rate 1mbit burst 1k conform-exceed pass / goto chain 42",
"expExitCode": "255",
"verifyCmd": "$TC actions ls action police",
"matchPattern": "action order [0-9]*: police 0x1 rate 1Mbit burst 1Kb mtu 2Kb action pass/goto chain 42",
"matchCount": "0",
"teardown": [
"$TC actions flush action police"
]
}
]