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| author | Stefano Brivio <sbrivio@redhat.com> | 2018-07-14 22:59:43 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-11-27 18:10:48 +0300 |
| commit | a1e0ae82cfd5f05973a6459ec17ed61df5cf0f9f (patch) | |
| tree | 9a90a9c1927c2ce186e67458e21903f4aefe2871 /include | |
| parent | 221609ce4ce547d2fbad0e7ecd68d66e12f358ec (diff) | |
| download | linux-a1e0ae82cfd5f05973a6459ec17ed61df5cf0f9f.tar.xz | |
netfilter: ipset: list:set: Decrease refcount synchronously on deletion and replace
[ Upstream commit 439cd39ea136d2c026805264d58a91f36b6b64ca ]
Commit 45040978c899 ("netfilter: ipset: Fix set:list type crash
when flush/dump set in parallel") postponed decreasing set
reference counters to the RCU callback.
An 'ipset del' command can terminate before the RCU grace period
is elapsed, and if sets are listed before then, the reference
counter shown in userspace will be wrong:
# ipset create h hash:ip; ipset create l list:set; ipset add l
# ipset del l h; ipset list h
Name: h
Type: hash:ip
Revision: 4
Header: family inet hashsize 1024 maxelem 65536
Size in memory: 88
References: 1
Number of entries: 0
Members:
# sleep 1; ipset list h
Name: h
Type: hash:ip
Revision: 4
Header: family inet hashsize 1024 maxelem 65536
Size in memory: 88
References: 0
Number of entries: 0
Members:
Fix this by making the reference count update synchronous again.
As a result, when sets are listed, ip_set_name_byindex() might
now fetch a set whose reference count is already zero. Instead
of relying on the reference count to protect against concurrent
set renaming, grab ip_set_ref_lock as reader and copy the name,
while holding the same lock in ip_set_rename() as writer
instead.
Reported-by: Li Shuang <shuali@redhat.com>
Fixes: 45040978c899 ("netfilter: ipset: Fix set:list type crash when flush/dump set in parallel")
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/netfilter/ipset/ip_set.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/netfilter/ipset/ip_set.h b/include/linux/netfilter/ipset/ip_set.h index 8e42253e5d4d..91a533bd3eb1 100644 --- a/include/linux/netfilter/ipset/ip_set.h +++ b/include/linux/netfilter/ipset/ip_set.h @@ -312,7 +312,7 @@ enum { extern ip_set_id_t ip_set_get_byname(struct net *net, const char *name, struct ip_set **set); extern void ip_set_put_byindex(struct net *net, ip_set_id_t index); -extern const char *ip_set_name_byindex(struct net *net, ip_set_id_t index); +extern void ip_set_name_byindex(struct net *net, ip_set_id_t index, char *name); extern ip_set_id_t ip_set_nfnl_get_byindex(struct net *net, ip_set_id_t index); extern void ip_set_nfnl_put(struct net *net, ip_set_id_t index); |