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Taehee Yoo bc928fdf5d bpf: use GFP_ATOMIC instead of GFP_KERNEL in bpf_parse_prog() [ Upstream commit `71eb5255f5` ] bpf_parse_prog() is protected by rcu_read_lock(). so that GFP_KERNEL is not allowed in the bpf_parse_prog(). [51015.579396] ============================= [51015.579418] WARNING: suspicious RCU usage [51015.579444] 4.18.0-rc6+ #208 Not tainted [51015.579464] ----------------------------- [51015.579488] ./include/linux/rcupdate.h:303 Illegal context switch in RCU read-side critical section! [51015.579510] other info that might help us debug this: [51015.579532] rcu_scheduler_active = 2, debug_locks = 1 [51015.579556] 2 locks held by ip/1861: [51015.579577] #0: 00000000a8c12fd1 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x2e0/0x910 [51015.579711] #1: 00000000bf815f8e (rcu_read_lock){....}, at: lwtunnel_build_state+0x96/0x390 [51015.579842] stack backtrace: [51015.579869] CPU: 0 PID: 1861 Comm: ip Not tainted 4.18.0-rc6+ #208 [51015.579891] Hardware name: To be filled by O.E.M. To be filled by O.E.M./Aptio CRB, BIOS 5.6.5 07/08/2015 [51015.579911] Call Trace: [51015.579950] dump_stack+0x74/0xbb [51015.580000] ___might_sleep+0x16b/0x3a0 [51015.580047] __kmalloc_track_caller+0x220/0x380 [51015.580077] kmemdup+0x1c/0x40 [51015.580077] bpf_parse_prog+0x10e/0x230 [51015.580164] ? kasan_kmalloc+0xa0/0xd0 [51015.580164] ? bpf_destroy_state+0x30/0x30 [51015.580164] ? bpf_build_state+0xe2/0x3e0 [51015.580164] bpf_build_state+0x1bb/0x3e0 [51015.580164] ? bpf_parse_prog+0x230/0x230 [51015.580164] ? lock_is_held_type+0x123/0x1a0 [51015.580164] lwtunnel_build_state+0x1aa/0x390 [51015.580164] fib_create_info+0x1579/0x33d0 [51015.580164] ? sched_clock_local+0xe2/0x150 [51015.580164] ? fib_info_update_nh_saddr+0x1f0/0x1f0 [51015.580164] ? sched_clock_local+0xe2/0x150 [51015.580164] fib_table_insert+0x201/0x1990 [51015.580164] ? lock_downgrade+0x610/0x610 [51015.580164] ? fib_table_lookup+0x1920/0x1920 [51015.580164] ? lwtunnel_valid_encap_type.part.6+0xcb/0x3a0 [51015.580164] ? rtm_to_fib_config+0x637/0xbd0 [51015.580164] inet_rtm_newroute+0xed/0x1b0 [51015.580164] ? rtm_to_fib_config+0xbd0/0xbd0 [51015.580164] rtnetlink_rcv_msg+0x331/0x910 [ ... ] Fixes: `3a0af8fd61` ("bpf: BPF for lightweight tunnel infrastructure") Signed-off-by: Taehee Yoo <ap420073@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2018-09-05 09:26:30 +02:00
Documentation	kbuild: verify that $DEPMOD is installed	2018-08-17 21:01:10 +02:00
arch	ARC: dma [non-IOC] setup SMP_CACHE_BYTES and cache_line_size	2018-09-05 09:26:30 +02:00
block	block: sed-opal: Fix a couple off by one bugs	2018-08-24 13:09:03 +02:00
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: skcipher - fix crash flushing dcache in error path	2018-08-17 21:01:10 +02:00
drivers	hinic: Link the logical network device to the pci device in sysfs	2018-09-05 09:26:30 +02:00
firmware	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
fs	cachefiles: Wait rather than BUG'ing on "Unexpected object collision"	2018-09-05 09:26:29 +02:00
include	locking/rtmutex: Allow specifying a subclass for nested locking	2018-09-05 09:26:29 +02:00
init	init: rename and re-order boot_cpu_state_init()	2018-08-15 18:12:48 +02:00
ipc	ipc/sem.c: prevent queue.status tearing in semop	2018-09-05 09:26:30 +02:00
kernel	sched/rt: Restore rt_runtime after disabling RT_RUNTIME_SHARE	2018-09-05 09:26:29 +02:00
lib	ioremap: Update pgtable free interfaces with addr	2018-08-17 21:01:11 +02:00
mm	zswap: re-check zswap_is_full() after do zswap_shrink()	2018-09-05 09:26:30 +02:00
net	bpf: use GFP_ATOMIC instead of GFP_KERNEL in bpf_parse_prog()	2018-09-05 09:26:30 +02:00
samples	samples/bpf: Check the error of write() and read()	2018-08-24 13:09:12 +02:00
scripts	kconfig: fix line numbers for if-entries in menu tree	2018-08-24 13:09:06 +02:00
security	Smack: Mark inode instant in smack_task_to_inode	2018-08-24 13:09:04 +02:00
sound	ALSA: seq: Fix UBSAN warning at SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT ioctl	2018-08-24 13:09:05 +02:00
tools	tools/power turbostat: Read extended processor family from CPUID	2018-09-05 09:26:30 +02:00
usr	initramfs: fix initramfs rebuilds w/ compression after disabling	2017-11-03 07:39:19 -07:00
virt	KVM: irqfd: fix race between EPOLLHUP and irq_bypass_register_consumer	2018-08-24 13:09:21 +02:00
.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: rpm-pkg: keep spec file until make mrproper	2018-02-13 10:19:46 +01:00
.mailmap	.mailmap: Add Maciej W. Rozycki's Imagination e-mail address	2017-11-10 12:16:15 -08:00
COPYING	…
CREDITS	MAINTAINERS: update TPM driver infrastructure changes	2017-11-09 17:58:40 -08:00
Kbuild	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
Kconfig	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
MAINTAINERS	dt-bindings: Document mti,mips-cpc binding	2018-03-15 10:54:35 +01:00
Makefile	Linux 4.14.67	2018-08-24 13:09:23 +02:00
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.