linux/net/sctp
Xin Long ef82bcfa67 sctp: use memdup_user instead of vmemdup_user
In sctp_setsockopt_bindx()/__sctp_setsockopt_connectx(), it allocates
memory with addrs_size which is passed from userspace. We used flag
GFP_USER to put some more restrictions on it in Commit cacc062152
("sctp: use GFP_USER for user-controlled kmalloc").

However, since Commit c981f254cc ("sctp: use vmemdup_user() rather
than badly open-coding memdup_user()"), vmemdup_user() has been used,
which doesn't check GFP_USER flag when goes to vmalloc_*(). So when
addrs_size is a huge value, it could exhaust memory and even trigger
oom killer.

This patch is to use memdup_user() instead, in which GFP_USER would
work to limit the memory allocation with a huge addrs_size.

Note we can't fix it by limiting 'addrs_size', as there's no demand
for it from RFC.

Reported-by: syzbot+ec1b7575afef85a0e5ca@syzkaller.appspotmail.com
Fixes: c981f254cc ("sctp: use vmemdup_user() rather than badly open-coding memdup_user()")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-03-20 11:09:47 -07:00
..
associola.c sctp: add SCTP_FUTURE_ASSOC for SCTP_PEER_ADDR_THLDS sockopt 2019-01-30 00:44:06 -08:00
auth.c sctp: move up sctp_auth_init_hmacs() in sctp_endpoint_init() 2019-03-08 11:42:49 -08:00
bind_addr.c sctp: add sock_reuseport for the sock in __sctp_hash_endpoint 2018-11-12 09:09:51 -08:00
chunk.c sctp: chunk.c: correct format string for size_t in printk 2019-02-28 10:33:40 -08:00
debug.c sctp: add SCTP_CID_I_DATA and SCTP_CID_I_FWD_TSN conversion in sctp_cname 2018-02-12 11:40:01 -05:00
diag.c inet_diag: fix reporting cgroup classid and fallback to priority 2019-02-12 13:35:57 -05:00
endpointola.c sctp: move up sctp_auth_init_hmacs() in sctp_endpoint_init() 2019-03-08 11:42:49 -08:00
input.c sctp: add sock_reuseport for the sock in __sctp_hash_endpoint 2018-11-12 09:09:51 -08:00
inqueue.c sctp: fix the issue that the cookie-ack with auth can't get processed 2018-05-02 11:15:33 -04:00
ipv6.c sctp: set flow sport from saddr only when it's 0 2019-01-24 18:13:57 -08:00
Kconfig sctp: whitespace fixes 2018-07-24 14:10:42 -07:00
Makefile sctp: rename sctp_diag.c as diag.c 2018-02-13 13:56:31 -05:00
objcnt.c proc: introduce proc_create_seq{,_data} 2018-05-16 07:23:35 +02:00
offload.c sctp: call gso_reset_checksum when computing checksum in sctp_gso_segment 2019-02-13 19:31:43 -05:00
output.c sctp: increase sk_wmem_alloc when head->truesize is increased 2018-11-27 15:42:31 -08:00
outqueue.c sctp: add SCTP_FUTURE_ASOC and SCTP_CURRENT_ASSOC for SCTP_STREAM_SCHEDULER sockopt 2019-01-30 00:44:08 -08:00
primitive.c sctp: rename enum sctp_event to sctp_event_type 2018-11-19 12:25:43 -08:00
proc.c sctp: remove useless start_fail from sctp_ht_iter in proc 2018-08-27 15:13:17 -07:00
protocol.c sctp: set flow sport from saddr only when it's 0 2019-01-24 18:13:57 -08:00
sm_make_chunk.c sctp: set chunk transport correctly when it's a new asoc 2019-01-24 18:13:57 -08:00
sm_sideeffect.c sctp: rename enum sctp_event to sctp_event_type 2018-11-19 12:25:43 -08:00
sm_statefuns.c sctp: delay the authentication for the duplicated cookie-echo chunk 2018-05-07 23:39:10 -04:00
sm_statetable.c sctp: rename enum sctp_event to sctp_event_type 2018-11-19 12:25:43 -08:00
socket.c sctp: use memdup_user instead of vmemdup_user 2019-03-20 11:09:47 -07:00
stream_interleave.c sctp: convert to genradix 2019-03-12 10:04:02 -07:00
stream_sched_prio.c net/sctp: Make wrappers for accessing in/out streams 2018-08-11 12:25:15 -07:00
stream_sched_rr.c net/sctp: Make wrappers for accessing in/out streams 2018-08-11 12:25:15 -07:00
stream_sched.c net/sctp: Make wrappers for accessing in/out streams 2018-08-11 12:25:15 -07:00
stream.c sctp: convert to genradix 2019-03-12 10:04:02 -07:00
sysctl.c sctp: support sysctl to allow users to use stream interleave 2017-12-15 13:52:22 -05:00
transport.c sctp: don't compare hb_timer expire date before starting it 2019-02-22 11:11:54 -08:00
tsnmap.c sctp: Fix FSF address in file headers 2013-12-06 12:37:56 -05:00
ulpevent.c sctp: remove sctp_chunk_put from fail_mark err path in sctp_ulpevent_make_rcvmsg 2018-05-10 17:48:36 -04:00
ulpqueue.c sctp: add subscribe per asoc 2018-11-19 12:25:43 -08:00