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Eric Dumazet ca89dee1eb net: igmp: add a missing rcu locking section [ Upstream commit `e7aadb27a5` ] Newly added igmpv3_get_srcaddr() needs to be called under rcu lock. Timer callbacks do not ensure this locking. ============================= WARNING: suspicious RCU usage 4.15.0+ #200 Not tainted ----------------------------- ./include/linux/inetdevice.h:216 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 3 locks held by syzkaller616973/4074: #0: (&mm->mmap_sem){++++}, at: [<00000000bfce669e>] __do_page_fault+0x32d/0xc90 arch/x86/mm/fault.c:1355 #1: ((&im->timer)){+.-.}, at: [<00000000619d2f71>] lockdep_copy_map include/linux/lockdep.h:178 [inline] #1: ((&im->timer)){+.-.}, at: [<00000000619d2f71>] call_timer_fn+0x1c6/0x820 kernel/time/timer.c:1316 #2: (&(&im->lock)->rlock){+.-.}, at: [<000000005f833c5c>] spin_lock_bh include/linux/spinlock.h:315 [inline] #2: (&(&im->lock)->rlock){+.-.}, at: [<000000005f833c5c>] igmpv3_send_report+0x98/0x5b0 net/ipv4/igmp.c:600 stack backtrace: CPU: 0 PID: 4074 Comm: syzkaller616973 Not tainted 4.15.0+ #200 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 lockdep_rcu_suspicious+0x123/0x170 kernel/locking/lockdep.c:4592 __in_dev_get_rcu include/linux/inetdevice.h:216 [inline] igmpv3_get_srcaddr net/ipv4/igmp.c:329 [inline] igmpv3_newpack+0xeef/0x12e0 net/ipv4/igmp.c:389 add_grhead.isra.27+0x235/0x300 net/ipv4/igmp.c:432 add_grec+0xbd3/0x1170 net/ipv4/igmp.c:565 igmpv3_send_report+0xd5/0x5b0 net/ipv4/igmp.c:605 igmp_send_report+0xc43/0x1050 net/ipv4/igmp.c:722 igmp_timer_expire+0x322/0x5c0 net/ipv4/igmp.c:831 call_timer_fn+0x228/0x820 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers+0x7ee/0xb70 kernel/time/timer.c:1666 run_timer_softirq+0x4c/0x70 kernel/time/timer.c:1692 __do_softirq+0x2d7/0xb85 kernel/softirq.c:285 invoke_softirq kernel/softirq.c:365 [inline] irq_exit+0x1cc/0x200 kernel/softirq.c:405 exiting_irq arch/x86/include/asm/apic.h:541 [inline] smp_apic_timer_interrupt+0x16b/0x700 arch/x86/kernel/apic/apic.c:1052 apic_timer_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:938 Fixes: `a46182b002` ("net: igmp: Use correct source address on IGMPv3 reports") Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: syzbot <syzkaller@googlegroups.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		History 2018-02-12 07:07:18 +01:00
arch	KVM/SVM: Allow direct access to MSR_IA32_SPEC_CTRL	2018-02-07 11:14:14 -08:00
block	block: drain queue before waiting for q_usage_counter becoming zero	2018-01-05 09:09:48 -07:00
certs	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
crypto	crypto: af_alg - whitelist mask and type	2018-02-03 17:58:33 +01:00
Documentation	x86/paravirt: Remove 'noreplace-paravirt' cmdline option	2018-02-07 11:14:13 -08:00
drivers	fpga: region: release of_parse_phandle nodes after use	2018-02-07 11:14:15 -08:00
firmware	kbuild: remove all dummy assignments to obj-	2017-11-18 11:46:06 +09:00
fs	orangefs: fix deadlock; do not write i_size in read_iter	2018-01-25 17:26:24 -08:00
include	x86/retpoline: Avoid retpolines for built-in __init functions	2018-02-07 11:14:13 -08:00
init	Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-01-12 10:23:59 -08:00
ipc	Rename superblock flags (MS_xyz -> SB_xyz)	2017-11-27 13:05:09 -08:00
kernel	module/retpoline: Warn about missing retpoline in module	2018-02-07 11:14:06 -08:00
lib	test_firmware: fix missing unlock on error in config_num_requests_store()	2018-02-03 17:58:43 +01:00
mm	mm, page_vma_mapped: Introduce pfn_in_hpage()	2018-01-22 12:15:57 -08:00
net	net: igmp: add a missing rcu locking section	2018-02-12 07:07:18 +01:00
samples	Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf	2017-12-03 13:08:30 -05:00
scripts	module/retpoline: Warn about missing retpoline in module	2018-02-07 11:14:06 -08:00
security	ima/policy: fix parsing of fsuuid	2018-02-03 17:58:35 +01:00
sound	ASoC: pcm512x: add missing MODULE_DESCRIPTION/AUTHOR/LICENSE	2018-02-07 11:14:09 -08:00
tools	objtool: Warn on stripped section symbol	2018-02-07 11:14:09 -08:00
usr	initramfs: fix initramfs rebuilds w/ compression after disabling	2017-11-03 07:39:19 -07:00
virt	KVM/ARM Fixes for v4.15, Round 3 (v2)	2018-01-17 14:59:27 +01:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.get_maintainer.ignore	Add hch to .get_maintainer.ignore	2015-08-21 14:30:10 -07:00
.gitattributes	.gitattributes: set git diff driver for C source code files	2016-10-07 18:46:30 -07:00
.gitignore	Kbuild misc updates for v4.15	2017-11-17 17:51:33 -08:00
.mailmap	mailmap: update Mark Yao's email address	2018-01-04 16:45:09 -08:00
COPYING	[PATCH] update FSF address in COPYING	2005-09-10 10:06:29 -07:00
CREDITS	MAINTAINERS: update TPM driver infrastructure changes	2017-11-09 17:58:40 -08:00
Kbuild	Kbuild updates for v4.15	2017-11-17 17:45:29 -08:00
Kconfig	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
MAINTAINERS	Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-01-28 12:19:23 -08:00
Makefile	Linux 4.15.2	2018-02-07 11:14:15 -08:00
README	README: add a new README file, pointing to the Documentation/	2016-10-24 08:12:35 -02:00

README

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.