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Message-ID: <20230619124336.651528-1-edumazet@google.com>
Date: Mon, 19 Jun 2023 12:43:35 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, eric.dumazet@...il.com,
Eric Dumazet <edumazet@...gle.com>, syzbot <syzkaller@...glegroups.com>,
Breno Leitao <leitao@...ian.org>, Willem de Bruijn <willemb@...gle.com>, David Ahern <dsahern@...nel.org>,
Kuniyuki Iwashima <kuniyu@...zon.com>
Subject: [PATCH net-next] net: remove sk_is_ipmr() and sk_is_icmpv6() helpers
Blamed commit added these helpers for sake of detecting RAW
sockets specific ioctl.
syzbot complained about it [1].
Issue here is that RAW sockets could pretend there was no need
to call ipmr_sk_ioctl()
Regardless of inet_sk(sk)->inet_num, we must be prepared
for ipmr_ioctl() being called later. This must happen
from ipmr_sk_ioctl() context only.
We could add a safety check in ipmr_ioctl() at the risk of breaking
applications.
Instead, remove sk_is_ipmr() and sk_is_icmpv6() because their
name would be misleading, once we change their implementation.
[1]
BUG: KASAN: stack-out-of-bounds in ipmr_ioctl+0xb12/0xbd0 net/ipv4/ipmr.c:1654
Read of size 4 at addr ffffc90003aefae4 by task syz-executor105/5004
CPU: 0 PID: 5004 Comm: syz-executor105 Not tainted 6.4.0-rc6-syzkaller-01304-gc08afcdcf952 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351
print_report mm/kasan/report.c:462 [inline]
kasan_report+0x11c/0x130 mm/kasan/report.c:572
ipmr_ioctl+0xb12/0xbd0 net/ipv4/ipmr.c:1654
raw_ioctl+0x4e/0x1e0 net/ipv4/raw.c:881
sock_ioctl_out net/core/sock.c:4186 [inline]
sk_ioctl+0x151/0x440 net/core/sock.c:4214
inet_ioctl+0x18c/0x380 net/ipv4/af_inet.c:1001
sock_do_ioctl+0xcc/0x230 net/socket.c:1189
sock_ioctl+0x1f8/0x680 net/socket.c:1306
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f2944bf6ad9
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd8897a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2944bf6ad9
RDX: 0000000000000000 RSI: 00000000000089e1 RDI: 0000000000000003
RBP: 00007f2944bbac80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2944bbad10
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
The buggy address belongs to stack of task syz-executor105/5004
and is located at offset 36 in frame:
sk_ioctl+0x0/0x440 net/core/sock.c:4172
This frame has 2 objects:
[32, 36) 'karg'
[48, 88) 'buffer'
Fixes: e1d001fa5b47 ("net: ioctl: Use kernel memory on protocol ioctl callbacks")
Reported-by: syzbot <syzkaller@...glegroups.com>
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Breno Leitao <leitao@...ian.org>
Cc: Willem de Bruijn <willemb@...gle.com>
Cc: David Ahern <dsahern@...nel.org>
Cc: Kuniyuki Iwashima <kuniyu@...zon.com>
---
include/linux/icmpv6.h | 6 ------
include/linux/mroute.h | 11 -----------
net/core/sock.c | 4 ++--
3 files changed, 2 insertions(+), 19 deletions(-)
diff --git a/include/linux/icmpv6.h b/include/linux/icmpv6.h
index 1fe33e6741cca2685082da214afbc94c7974f4ce..db0f4fcfdaf4f138d75dc6c4073cb286364f2923 100644
--- a/include/linux/icmpv6.h
+++ b/include/linux/icmpv6.h
@@ -111,10 +111,4 @@ static inline bool icmpv6_is_err(int type)
return false;
}
-static inline int sk_is_icmpv6(struct sock *sk)
-{
- return sk->sk_family == AF_INET6 &&
- inet_sk(sk)->inet_num == IPPROTO_ICMPV6;
-}
-
#endif
diff --git a/include/linux/mroute.h b/include/linux/mroute.h
index 94c6e6f549f0a503f6707d1175f1c47a0f0cd887..4c5003afee6c51962bc13879978845bc7daf08fa 100644
--- a/include/linux/mroute.h
+++ b/include/linux/mroute.h
@@ -16,12 +16,6 @@ static inline int ip_mroute_opt(int opt)
return opt >= MRT_BASE && opt <= MRT_MAX;
}
-static inline int sk_is_ipmr(struct sock *sk)
-{
- return sk->sk_family == AF_INET &&
- inet_sk(sk)->inet_num == IPPROTO_IGMP;
-}
-
int ip_mroute_setsockopt(struct sock *, int, sockptr_t, unsigned int);
int ip_mroute_getsockopt(struct sock *, int, sockptr_t, sockptr_t);
int ipmr_ioctl(struct sock *sk, int cmd, void *arg);
@@ -57,11 +51,6 @@ static inline int ip_mroute_opt(int opt)
return 0;
}
-static inline int sk_is_ipmr(struct sock *sk)
-{
- return 0;
-}
-
static inline bool ipmr_rule_default(const struct fib_rule *rule)
{
return true;
diff --git a/net/core/sock.c b/net/core/sock.c
index cff3e82514d17513bc96300dc18014083a0d7ea7..8ec8f4c9911f2a6dd3dd946798d512394d62a861 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -4199,9 +4199,9 @@ int sk_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
{
int rc = 1;
- if (sk_is_ipmr(sk))
+ if (sk->sk_type == SOCK_RAW && sk->sk_family == AF_INET)
rc = ipmr_sk_ioctl(sk, cmd, arg);
- else if (sk_is_icmpv6(sk))
+ else if (sk->sk_type == SOCK_RAW && sk->sk_family == AF_INET6)
rc = ip6mr_sk_ioctl(sk, cmd, arg);
else if (sk_is_phonet(sk))
rc = phonet_sk_ioctl(sk, cmd, arg);
--
2.41.0.185.g7c58973941-goog
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