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tipc: fix uninit-value in tipc_nl_compat_bearer_enable
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syzbot reported:

BUG: KMSAN: uninit-value in strlen+0x3b/0xa0 lib/string.c:484
CPU: 1 PID: 6371 Comm: syz-executor652 Not tainted 4.19.0-rc8+ hardkernel#70
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x306/0x460 lib/dump_stack.c:113
 kmsan_report+0x1a2/0x2e0 mm/kmsan/kmsan.c:917
 __msan_warning+0x7c/0xe0 mm/kmsan/kmsan_instr.c:500
 strlen+0x3b/0xa0 lib/string.c:484
 nla_put_string include/net/netlink.h:1011 [inline]
 tipc_nl_compat_bearer_enable+0x238/0x7b0 net/tipc/netlink_compat.c:389
 __tipc_nl_compat_doit net/tipc/netlink_compat.c:311 [inline]
 tipc_nl_compat_doit+0x39f/0xae0 net/tipc/netlink_compat.c:344
 tipc_nl_compat_recv+0x147c/0x2760 net/tipc/netlink_compat.c:1107
 genl_family_rcv_msg net/netlink/genetlink.c:601 [inline]
 genl_rcv_msg+0x185c/0x1a20 net/netlink/genetlink.c:626
 netlink_rcv_skb+0x394/0x640 net/netlink/af_netlink.c:2454
 genl_rcv+0x63/0x80 net/netlink/genetlink.c:637
 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
 netlink_unicast+0x166d/0x1720 net/netlink/af_netlink.c:1343
 netlink_sendmsg+0x1391/0x1420 net/netlink/af_netlink.c:1908
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg net/socket.c:631 [inline]
 ___sys_sendmsg+0xe47/0x1200 net/socket.c:2116
 __sys_sendmsg net/socket.c:2154 [inline]
 __do_sys_sendmsg net/socket.c:2163 [inline]
 __se_sys_sendmsg+0x307/0x460 net/socket.c:2161
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2161
 do_syscall_64+0xbe/0x100 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x440179
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fffef7beee8 EFLAGS: 00000213 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440179
RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401a00
R13: 0000000000401a90 R14: 0000000000000000 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:255 [inline]
 kmsan_internal_poison_shadow+0xc8/0x1d0 mm/kmsan/kmsan.c:180
 kmsan_kmalloc+0xa4/0x120 mm/kmsan/kmsan_hooks.c:104
 kmsan_slab_alloc+0x10/0x20 mm/kmsan/kmsan_hooks.c:113
 slab_post_alloc_hook mm/slab.h:446 [inline]
 slab_alloc_node mm/slub.c:2727 [inline]
 __kmalloc_node_track_caller+0xb43/0x1400 mm/slub.c:4360
 __kmalloc_reserve net/core/skbuff.c:138 [inline]
 __alloc_skb+0x422/0xe90 net/core/skbuff.c:206
 alloc_skb include/linux/skbuff.h:996 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1189 [inline]
 netlink_sendmsg+0xcaf/0x1420 net/netlink/af_netlink.c:1883
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg net/socket.c:631 [inline]
 ___sys_sendmsg+0xe47/0x1200 net/socket.c:2116
 __sys_sendmsg net/socket.c:2154 [inline]
 __do_sys_sendmsg net/socket.c:2163 [inline]
 __se_sys_sendmsg+0x307/0x460 net/socket.c:2161
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2161
 do_syscall_64+0xbe/0x100 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7

The root cause is that we don't validate whether bear name is a valid
string in tipc_nl_compat_bearer_enable().

Meanwhile, we also fix the same issue in the following functions:
tipc_nl_compat_bearer_disable()
tipc_nl_compat_link_stat_dump()
tipc_nl_compat_media_set()
tipc_nl_compat_bearer_set()

Reported-by: syzbot+b33d5cae0efd35dbfe77@syzkaller.appspotmail.com
Signed-off-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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@ying-xue @davem330
ying-xue authored and davem330 committed Jan 16, 2019
1 parent 8b66fee commit 0762216
Showing 1 changed file with 26 additions and 0 deletions.
26 changes: 26 additions & 0 deletions net/tipc/netlink_compat.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -389,13 +389,18 @@ static int tipc_nl_compat_bearer_enable(struct tipc_nl_compat_cmd_doit *cmd,
struct nlattr *prop;
struct nlattr *bearer;
struct tipc_bearer_config *b;
int len;

b = (struct tipc_bearer_config *)TLV_DATA(msg->req);

bearer = nla_nest_start(skb, TIPC_NLA_BEARER);
if (!bearer)
return -EMSGSIZE;

len = min_t(int, TLV_GET_DATA_LEN(msg->req), TIPC_MAX_BEARER_NAME);
if (!string_is_valid(b->name, len))
return -EINVAL;

if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, b->name))
return -EMSGSIZE;

Expand All @@ -421,13 +426,18 @@ static int tipc_nl_compat_bearer_disable(struct tipc_nl_compat_cmd_doit *cmd,
{
char *name;
struct nlattr *bearer;
int len;

name = (char *)TLV_DATA(msg->req);

bearer = nla_nest_start(skb, TIPC_NLA_BEARER);
if (!bearer)
return -EMSGSIZE;

len = min_t(int, TLV_GET_DATA_LEN(msg->req), TIPC_MAX_BEARER_NAME);
if (!string_is_valid(name, len))
return -EINVAL;

if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, name))
return -EMSGSIZE;

Expand Down Expand Up @@ -488,6 +498,7 @@ static int tipc_nl_compat_link_stat_dump(struct tipc_nl_compat_msg *msg,
struct nlattr *prop[TIPC_NLA_PROP_MAX + 1];
struct nlattr *stats[TIPC_NLA_STATS_MAX + 1];
int err;
int len;

if (!attrs[TIPC_NLA_LINK])
return -EINVAL;
Expand All @@ -514,6 +525,11 @@ static int tipc_nl_compat_link_stat_dump(struct tipc_nl_compat_msg *msg,
return err;

name = (char *)TLV_DATA(msg->req);

len = min_t(int, TLV_GET_DATA_LEN(msg->req), TIPC_MAX_LINK_NAME);
if (!string_is_valid(name, len))
return -EINVAL;

if (strcmp(name, nla_data(link[TIPC_NLA_LINK_NAME])) != 0)
return 0;

Expand Down Expand Up @@ -654,13 +670,18 @@ static int tipc_nl_compat_media_set(struct sk_buff *skb,
struct nlattr *prop;
struct nlattr *media;
struct tipc_link_config *lc;
int len;

lc = (struct tipc_link_config *)TLV_DATA(msg->req);

media = nla_nest_start(skb, TIPC_NLA_MEDIA);
if (!media)
return -EMSGSIZE;

len = min_t(int, TLV_GET_DATA_LEN(msg->req), TIPC_MAX_MEDIA_NAME);
if (!string_is_valid(lc->name, len))
return -EINVAL;

if (nla_put_string(skb, TIPC_NLA_MEDIA_NAME, lc->name))
return -EMSGSIZE;

Expand All @@ -681,13 +702,18 @@ static int tipc_nl_compat_bearer_set(struct sk_buff *skb,
struct nlattr *prop;
struct nlattr *bearer;
struct tipc_link_config *lc;
int len;

lc = (struct tipc_link_config *)TLV_DATA(msg->req);

bearer = nla_nest_start(skb, TIPC_NLA_BEARER);
if (!bearer)
return -EMSGSIZE;

len = min_t(int, TLV_GET_DATA_LEN(msg->req), TIPC_MAX_MEDIA_NAME);
if (!string_is_valid(lc->name, len))
return -EINVAL;

if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, lc->name))
return -EMSGSIZE;

Expand Down

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