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xfrm: policy: fix netlink/pf_key policy lookups

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Colin Ian King says:
 Static analysis with CoverityScan found a potential issue [..]
 It seems that pointer pol is set to NULL and then a check to see if it
 is non-null is used to set pol to tmp; howeverm this check is always
 going to be false because pol is always NULL.

Fix this and update test script to catch this.  Updated script only:
./xfrm_policy.sh ; echo $?
RTNETLINK answers: No such file or directory
FAIL: ip -net ns3 xfrm policy get src 10.0.1.0/24 dst 10.0.2.0/24 dir out
RTNETLINK answers: No such file or directory
[..]
PASS: policy before exception matches
PASS: ping to .254 bypassed ipsec tunnel
PASS: direct policy matches
PASS: policy matches
1

Fixes: 6be3b0db6d ("xfrm: policy: add inexact policy search tree infrastructure")
Reported-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Florian Westphal 2018-11-15 02:51:57 +01:00 committed by Steffen Klassert
parent 7759d6a837
commit 39aa6928d4
2 changed files with 36 additions and 7 deletions
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5
net/xfrm/xfrm_policy.c
View File

@ -1663,7 +1663,10 @@ struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u32 if_id,
tmp = __xfrm_policy_bysel_ctx(cand.res[i], mark,
if_id, type, dir,
sel, ctx);
if (tmp && pol && tmp->pos < pol->pos)
if (!tmp)
continue;
if (!pol || tmp->pos < pol->pos)
pol = tmp;
}
} else {

38
tools/testing/selftests/net/xfrm_policy.sh
View File

@ -21,6 +21,7 @@
# Kselftest framework requirement - SKIP code is 4.
ksft_skip=4
ret=0
policy_checks_ok=1
KEY_SHA=0xdeadbeef1234567890abcdefabcdefabcdefabcd
KEY_AES=0x0123456789abcdef0123456789012345
@ -45,6 +46,26 @@ do_esp() {
ip -net $ns xfrm policy add src $rnet dst $lnet dir fwd tmpl src $remote dst $me proto esp mode tunnel priority 100 action allow
}
do_esp_policy_get_check() {
local ns=$1
local lnet=$2
local rnet=$3
ip -net $ns xfrm policy get src $lnet dst $rnet dir out > /dev/null
if [ $? -ne 0 ] && [ $policy_checks_ok -eq 1 ] ;then
policy_checks_ok=0
echo "FAIL: ip -net $ns xfrm policy get src $lnet dst $rnet dir out"
ret=1
fi
ip -net $ns xfrm policy get src $rnet dst $lnet dir fwd > /dev/null
if [ $? -ne 0 ] && [ $policy_checks_ok -eq 1 ] ;then
policy_checks_ok=0
echo "FAIL: ip -net $ns xfrm policy get src $rnet dst $lnet dir fwd"
ret=1
fi
}
do_exception() {
local ns=$1
local me=$2
@ -112,31 +133,31 @@ check_xfrm() {
# 1: iptables -m policy rule count != 0
rval=$1
ip=$2
ret=0
lret=0
ip netns exec ns1 ping -q -c 1 10.0.2.$ip > /dev/null
check_ipt_policy_count ns3
if [ $? -ne $rval ] ; then
ret=1
lret=1
fi
check_ipt_policy_count ns4
if [ $? -ne $rval ] ; then
ret=1
lret=1
fi
ip netns exec ns2 ping -q -c 1 10.0.1.$ip > /dev/null
check_ipt_policy_count ns3
if [ $? -ne $rval ] ; then
ret=1
lret=1
fi
check_ipt_policy_count ns4
if [ $? -ne $rval ] ; then
ret=1
lret=1
fi
return $ret
return $lret
}
#check for needed privileges
@ -227,6 +248,11 @@ do_esp ns4 dead:3::10 dead:3::1 dead:2::/64 dead:1::/64 $SPI2 $SPI1
do_dummies4 ns3
do_dummies6 ns4
do_esp_policy_get_check ns3 10.0.1.0/24 10.0.2.0/24
do_esp_policy_get_check ns4 10.0.2.0/24 10.0.1.0/24
do_esp_policy_get_check ns3 dead:1::/64 dead:2::/64
do_esp_policy_get_check ns4 dead:2::/64 dead:1::/64
# ping to .254 should use ipsec, exception is not installed.
check_xfrm 1 254
if [ $? -ne 0 ]; then