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OpenCloudOS-Kernel/net/ipv4
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Alexey Dobriyan 0147fc058d tcp: restrict net.ipv4.tcp_adv_win_scale (#20312) 
tcp_win_from_space() does the following:

      if (sysctl_tcp_adv_win_scale <= 0)
              return space >> (-sysctl_tcp_adv_win_scale);
      else
              return space - (space >> sysctl_tcp_adv_win_scale);

"space" is int.

As per C99 6.5.7 (3) shifting int for 32 or more bits is
undefined behaviour.

Indeed, if sysctl_tcp_adv_win_scale is exactly 32,
space >> 32 equals space and function returns 0.

Which means we busyloop in tcp_fixup_rcvbuf().

Restrict net.ipv4.tcp_adv_win_scale to [-31, 31].

Fix https://bugzilla.kernel.org/show_bug.cgi?id=20312

Steps to reproduce:

      echo 32 >/proc/sys/net/ipv4/tcp_adv_win_scale
      wget www.kernel.org
      [softlockup]

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2010-11-28 10:39:45 -08:00
..
netfilter ipv4: netfilter: ip_tables: fix information leak to userland 2010-11-03 08:45:06 +01:00
Kconfig Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2010-10-24 13:41:39 -07:00
Makefile PPTP: PPP over IPv4 (Point-to-Point Tunneling Protocol) 2010-08-21 23:05:39 -07:00
af_inet.c net: build_ehash_secret() and rt_bind_peer() cleanups 2010-08-20 00:50:16 -07:00
ah4.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
arp.c neigh: Protect neigh->ha[] with a seqlock 2010-10-11 12:54:04 -07:00
cipso_ipv4.c Update broken web addresses in the kernel. 2010-10-18 11:03:14 +02:00
datagram.c net: return operator cleanup 2010-09-23 14:33:39 -07:00
devinet.c inet: RCU changes in inetdev_by_index() 2010-10-19 03:50:48 -07:00
esp4.c xfrm: SA lookups signature with mark 2010-02-22 16:20:22 -08:00
fib_frontend.c fib: Fix fib zone and its hash leak on namespace stop 2010-10-28 10:27:03 -07:00
fib_hash.c fib: Fix fib zone and its hash leak on namespace stop 2010-10-28 10:27:03 -07:00
fib_lookup.h fib: fib_result_assign() should not change fib refcounts 2010-11-04 12:05:32 -07:00
fib_rules.c fib: RCU conversion of fib_lookup() 2010-10-05 20:39:38 -07:00
fib_semantics.c fib: introduce fib_alias_accessed() helper 2010-10-21 03:09:41 -07:00
fib_trie.c net: allow GFP_HIGHMEM in __vmalloc() 2010-11-21 10:04:04 -08:00
gre.c tunnels: add _rcu annotations 2010-10-25 13:09:45 -07:00
icmp.c xfrm: update flowi saddr in icmp_send if unset 2010-11-16 11:43:39 -08:00
igmp.c inet: fix ip_mc_drop_socket() 2010-11-09 08:26:42 -08:00
inet_connection_sock.c net/ipv4: EXPORT_SYMBOL cleanups 2010-07-12 12:57:54 -07:00
inet_diag.c inet_diag: Make sure we actually run the same bytecode we audited. 2010-11-04 12:26:34 -07:00
inet_fragment.c net/ipv4: EXPORT_SYMBOL cleanups 2010-07-12 12:57:54 -07:00
inet_hashtables.c tproxy: fix hash locking issue when using port redirection in __inet_inherit_port() 2010-10-21 13:06:43 +02:00
inet_lro.c net/ipv4: Move && and || to end of previous line 2009-11-23 10:41:23 -08:00
inet_timewait_sock.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
inetpeer.c inetpeer: __rcu annotations 2010-10-27 11:37:33 -07:00
ip_forward.c net-next: remove useless union keyword 2010-06-10 23:31:35 -07:00
ip_fragment.c net: return operator cleanup 2010-09-23 14:33:39 -07:00
ip_gre.c ip_gre: fix fallback tunnel setup 2010-10-30 16:21:28 -07:00
ip_input.c net: use this_cpu_ptr() 2010-06-28 23:24:29 -07:00
ip_options.c bridge : Sanitize skb before it enters the IP stack 2010-09-19 12:42:34 -07:00
ip_output.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2010-09-27 01:03:03 -07:00
ip_sockglue.c ipv4: add __rcu annotations to ip_ra_chain 2010-10-25 14:18:28 -07:00
ipcomp.c xfrm: SA lookups signature with mark 2010-02-22 16:20:22 -08:00
ipconfig.c ipconfig: send host-name in DHCP requests 2010-06-02 07:05:03 -07:00
ipip.c tunnels: Fix tunnels change rcu protection 2010-10-27 14:20:08 -07:00
ipmr.c ipmr: cleanups 2010-10-03 21:50:53 -07:00
netfilter.c Merge branch 'master' of /repos/git/net-next-2.6 2010-06-15 17:31:06 +02:00
proc.c net: avoid limits overflow 2010-11-10 12:12:00 -08:00
protocol.c net: add __rcu annotations to protocol 2010-10-27 11:37:31 -07:00
raw.c net: simplify flags for tx timestamping 2010-08-19 00:08:30 -07:00
route.c ipv4: add __rcu annotations to routes.c 2010-10-27 11:37:31 -07:00
syncookies.c syncookies: add support for ECN 2010-06-26 22:00:03 -07:00
sysctl_net_ipv4.c tcp: restrict net.ipv4.tcp_adv_win_scale (#20312) 2010-11-28 10:39:45 -08:00
tcp.c tcp: Make TCP_MAXSEG minimum more correct. 2010-11-24 11:47:22 -08:00
tcp_bic.c tcp: add helper for AI algorithm 2009-03-02 03:00:15 -08:00
tcp_cong.c net/ipv4: Eliminate kstrdup memory leak 2010-08-27 19:31:56 -07:00
tcp_cubic.c tcp: add helper for AI algorithm 2009-03-02 03:00:15 -08:00
tcp_diag.c tcp: diag: Dont report negative values for rx queue 2009-12-03 16:06:13 -08:00
tcp_highspeed.c [TCP]: Cong.ctrl modules: remove unused good_ack from cong_avoid 2008-01-28 14:55:41 -08:00
tcp_htcp.c net/ipv4: Move && and || to end of previous line 2009-11-23 10:41:23 -08:00
tcp_hybla.c TCP: tcp_hybla: Fix integer overflow in slow start increment 2010-06-02 07:15:48 -07:00
tcp_illinois.c Update broken web addresses in the kernel. 2010-10-18 11:03:14 +02:00
tcp_input.c net: avoid limits overflow 2010-11-10 12:12:00 -08:00
tcp_ipv4.c netns: Don't leak others' openreq-s in proc 2010-11-27 22:57:48 -08:00
tcp_lp.c net/ipv4: Move && and || to end of previous line 2009-11-23 10:41:23 -08:00
tcp_minisocks.c net: return operator cleanup 2010-09-23 14:33:39 -07:00
tcp_output.c net: return operator cleanup 2010-09-23 14:33:39 -07:00
tcp_probe.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
tcp_scalable.c tcp: add helper for AI algorithm 2009-03-02 03:00:15 -08:00
tcp_timer.c tcp: use correct counters in CA_CWR state too 2010-10-17 13:46:33 -07:00
tcp_vegas.c tcp: tcp_vegas ssthresh bugfix 2009-05-25 22:44:59 -07:00
tcp_vegas.h
…
tcp_veno.c Update broken web addresses in the kernel. 2010-10-18 11:03:14 +02:00
tcp_westwood.c net: return operator cleanup 2010-09-23 14:33:39 -07:00
tcp_yeah.c net/ipv4: Move && and || to end of previous line 2009-11-23 10:41:23 -08:00
tunnel4.c tunnels: add __rcu annotations 2010-10-27 11:37:32 -07:00
udp.c net: avoid limits overflow 2010-11-10 12:12:00 -08:00
udp_impl.h net: Make setsockopt() optlen be unsigned. 2009-09-30 16:12:20 -07:00
udplite.c net/ipv4: EXPORT_SYMBOL cleanups 2010-07-12 12:57:54 -07:00
xfrm4_input.c net/ipv4: EXPORT_SYMBOL cleanups 2010-07-12 12:57:54 -07:00
xfrm4_mode_beet.c ipsec: Interfamily IPSec BEET 2008-08-06 02:39:30 -07:00
xfrm4_mode_transport.c [IPSEC]: Use IPv6 calling convention as the convention for x->mode->output 2007-10-10 16:55:54 -07:00
xfrm4_mode_tunnel.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
xfrm4_output.c netfilter: ipv4: use NFPROTO values for NF_HOOK invocation 2010-03-25 16:00:30 +01:00
xfrm4_policy.c net dst: use a percpu_counter to track entries 2010-10-11 13:06:53 -07:00
xfrm4_state.c xfrm: Allow different selector family in temporary state 2010-09-20 11:11:38 -07:00
xfrm4_tunnel.c net: struct xfrm_tunnel in read_mostly section 2010-08-30 13:50:45 -07:00