From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: davem@davemloft.net, netdev@vger.kernel.org, kuba@kernel.org
Subject: [PATCH net 6/9] netfilter: x_tables: gpf inside xt_find_revision()
Date: Sat, 6 Mar 2021 13:12:20 +0100 [thread overview]
Message-ID: <20210306121223.28711-7-pablo@netfilter.org> (raw)
In-Reply-To: <20210306121223.28711-1-pablo@netfilter.org>
From: Vasily Averin <vvs@virtuozzo.com>
nested target/match_revfn() calls work with xt[NFPROTO_UNSPEC] lists
without taking xt[NFPROTO_UNSPEC].mutex. This can race with module unload
and cause host to crash:
general protection fault: 0000 [#1]
Modules linked in: ... [last unloaded: xt_cluster]
CPU: 0 PID: 542455 Comm: iptables
RIP: 0010:[<ffffffff8ffbd518>] [<ffffffff8ffbd518>] strcmp+0x18/0x40
RDX: 0000000000000003 RSI: ffff9a5a5d9abe10 RDI: dead000000000111
R13: ffff9a5a5d9abe10 R14: ffff9a5a5d9abd8c R15: dead000000000100
(VvS: %R15 -- &xt_match, %RDI -- &xt_match.name,
xt_cluster unregister match in xt[NFPROTO_UNSPEC].match list)
Call Trace:
[<ffffffff902ccf44>] match_revfn+0x54/0xc0
[<ffffffff902ccf9f>] match_revfn+0xaf/0xc0
[<ffffffff902cd01e>] xt_find_revision+0x6e/0xf0
[<ffffffffc05a5be0>] do_ipt_get_ctl+0x100/0x420 [ip_tables]
[<ffffffff902cc6bf>] nf_getsockopt+0x4f/0x70
[<ffffffff902dd99e>] ip_getsockopt+0xde/0x100
[<ffffffff903039b5>] raw_getsockopt+0x25/0x50
[<ffffffff9026c5da>] sock_common_getsockopt+0x1a/0x20
[<ffffffff9026b89d>] SyS_getsockopt+0x7d/0xf0
[<ffffffff903cbf92>] system_call_fastpath+0x25/0x2a
Fixes: 656caff20e1 ("netfilter 04/09: x_tables: fix match/target revision lookup")
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Reviewed-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
net/netfilter/x_tables.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index acce622582e3..bce6ca203d46 100644
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -330,6 +330,7 @@ static int match_revfn(u8 af, const char *name, u8 revision, int *bestp)
const struct xt_match *m;
int have_rev = 0;
+ mutex_lock(&xt[af].mutex);
list_for_each_entry(m, &xt[af].match, list) {
if (strcmp(m->name, name) == 0) {
if (m->revision > *bestp)
@@ -338,6 +339,7 @@ static int match_revfn(u8 af, const char *name, u8 revision, int *bestp)
have_rev = 1;
}
}
+ mutex_unlock(&xt[af].mutex);
if (af != NFPROTO_UNSPEC && !have_rev)
return match_revfn(NFPROTO_UNSPEC, name, revision, bestp);
@@ -350,6 +352,7 @@ static int target_revfn(u8 af, const char *name, u8 revision, int *bestp)
const struct xt_target *t;
int have_rev = 0;
+ mutex_lock(&xt[af].mutex);
list_for_each_entry(t, &xt[af].target, list) {
if (strcmp(t->name, name) == 0) {
if (t->revision > *bestp)
@@ -358,6 +361,7 @@ static int target_revfn(u8 af, const char *name, u8 revision, int *bestp)
have_rev = 1;
}
}
+ mutex_unlock(&xt[af].mutex);
if (af != NFPROTO_UNSPEC && !have_rev)
return target_revfn(NFPROTO_UNSPEC, name, revision, bestp);
@@ -371,12 +375,10 @@ int xt_find_revision(u8 af, const char *name, u8 revision, int target,
{
int have_rev, best = -1;
- mutex_lock(&xt[af].mutex);
if (target == 1)
have_rev = target_revfn(af, name, revision, &best);
else
have_rev = match_revfn(af, name, revision, &best);
- mutex_unlock(&xt[af].mutex);
/* Nothing at all? Return 0 to try loading module. */
if (best == -1) {
--
2.20.1
next prev parent reply other threads:[~2021-03-06 12:13 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-06 12:12 [PATCH net 0/9] Netfilter fixes for net Pablo Neira Ayuso
2021-03-06 12:12 ` [PATCH net 1/9] uapi: nfnetlink_cthelper.h: fix userspace compilation error Pablo Neira Ayuso
2021-03-07 1:10 ` patchwork-bot+netdevbpf
2021-03-06 12:12 ` [PATCH net 2/9] netfilter: conntrack: Remove a double space in a log message Pablo Neira Ayuso
2021-03-06 12:12 ` [PATCH net 3/9] netfilter: nf_nat: undo erroneous tcp edemux lookup Pablo Neira Ayuso
2021-03-06 14:49 ` Mika Penttilä
2021-03-06 16:10 ` Mika Penttilä
2021-03-06 12:12 ` [PATCH net 4/9] netfilter: conntrack: avoid misleading 'invalid' in log message Pablo Neira Ayuso
2021-03-06 12:12 ` [PATCH net 5/9] selftests: netfilter: test nat port clash resolution interaction with tcp early demux Pablo Neira Ayuso
2021-03-06 12:12 ` Pablo Neira Ayuso [this message]
2021-03-06 12:12 ` [PATCH net 7/9] netfilter: nftables: disallow updates on table ownership Pablo Neira Ayuso
2021-03-06 12:12 ` [PATCH net 8/9] netfilter: nftables: fix possible double hook unregistration with table owner Pablo Neira Ayuso
2021-03-06 12:12 ` [PATCH net 9/9] netfilter: nftables: bogus check for netlink portID " Pablo Neira Ayuso
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