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
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ABI	oom: document obsolete oom_adj tunable	2010-11-12 07:55:31 -08:00
DocBook	Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb	2010-10-29 11:49:38 -07:00
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accounting	delay-accounting: reimplement -c for getdelays.c to report information on a target command	2010-10-27 18:03:17 -07:00
acpi	…
aoe	…
arm	…
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blackfin	…
block	Documentation: remove anticipatory scheduler info	2010-11-11 12:09:59 +01:00
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cdrom	…
cgroups	cgroup: add clone_children control file	2010-10-27 18:03:09 -07:00
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fb	Merge branch 'viafb-next' of git://github.com/schandinat/linux-2.6	2010-10-27 19:02:41 -07:00
filesystems	xfs: remove experimental tag from the delaylog option	2010-11-10 12:00:47 -06:00
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frv	…
hwmon	hwmon: (it87) Add support for the IT8721F/IT8758E	2010-10-28 20:31:51 +02:00
i2c	i2c-i801: Add PCI idents for Patsburg 'IDF' SMBus controllers	2010-10-31 21:07:00 +01:00
i2o	…
ia64	…
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input	…
ioctl	Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6	2010-10-28 12:13:00 -07:00
isdn	…
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kbuild	Merge branch 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6	2010-10-28 16:18:59 -07:00
kdump	…
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leds	Documentation: led drivers lp5521 and lp5523	2010-11-12 07:55:32 -08:00
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networking	tcp: restrict net.ipv4.tcp_adv_win_scale (#20312)	2010-11-28 10:39:45 -08:00
parisc	…
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sysctl	Restrict unprivileged access to kernel syslog	2010-11-12 07:55:32 -08:00
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coccinelle.txt	Coccinelle: Fix documentation	2010-10-28 00:32:23 +02:00
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cpu-load.txt	…
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credentials.txt	…
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debugging-modules.txt	…
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devices.txt	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6	2010-10-28 09:35:11 -07:00
dmaengine.txt	…
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dynamic-debug-howto.txt	…
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eisa.txt	…
email-clients.txt	…
feature-removal-schedule.txt	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6	2010-10-28 09:35:11 -07:00
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irqflags-tracing.txt	…
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java.txt	…
kernel-doc-nano-HOWTO.txt	…
kernel-docs.txt	…
kernel-parameters.txt	Documentation: remove anticipatory scheduler info	2010-11-11 12:09:59 +01:00
keys-request-key.txt	…
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kmemcheck.txt	…
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leds-class.txt	led-class: always implement blinking	2010-11-12 07:55:32 -08:00
leds-lp3944.txt	…
local_ops.txt	…
lockdep-design.txt	…
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rbtree.txt	Documentation: remove anticipatory scheduler info	2010-11-11 12:09:59 +01:00
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robust-futexes.txt	…
rt-mutex-design.txt	…
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