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Eric Dumazet a06fa34d73 UPSTREAM: kcm: disable preemption in kcm_parse_func_strparser() 
After commit a2c11b0341 ("kcm: use BPF_PROG_RUN")
syzbot easily triggers the warning in cant_sleep().

As explained in commit 6cab5e90ab ("bpf: run bpf programs
with preemption disabled") we need to disable preemption before
running bpf programs.

BUG: assuming atomic context at net/kcm/kcmsock.c:382
in_atomic(): 0, irqs_disabled(): 0, pid: 7, name: kworker/u4:0
3 locks held by kworker/u4:0/7:
 #0: ffff888216726128 ((wq_completion)kstrp){+.+.}, at: __write_once_size include/linux/compiler.h:226 [inline]
 #0: ffff888216726128 ((wq_completion)kstrp){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888216726128 ((wq_completion)kstrp){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline]
 #0: ffff888216726128 ((wq_completion)kstrp){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
 #0: ffff888216726128 ((wq_completion)kstrp){+.+.}, at: set_work_data kernel/workqueue.c:620 [inline]
 #0: ffff888216726128 ((wq_completion)kstrp){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline]
 #0: ffff888216726128 ((wq_completion)kstrp){+.+.}, at: process_one_work+0x88b/0x1740 kernel/workqueue.c:2240
 #1: ffff8880a989fdc0 ((work_completion)(&strp->work)){+.+.}, at: process_one_work+0x8c1/0x1740 kernel/workqueue.c:2244
 #2: ffff888098998d10 (sk_lock-AF_INET){+.+.}, at: lock_sock include/net/sock.h:1522 [inline]
 #2: ffff888098998d10 (sk_lock-AF_INET){+.+.}, at: strp_sock_lock+0x2e/0x40 net/strparser/strparser.c:440
CPU: 0 PID: 7 Comm: kworker/u4:0 Not tainted 5.3.0+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: kstrp strp_work
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 __cant_sleep kernel/sched/core.c:6826 [inline]
 __cant_sleep.cold+0xa4/0xbc kernel/sched/core.c:6803
 kcm_parse_func_strparser+0x54/0x200 net/kcm/kcmsock.c:382
 __strp_recv+0x5dc/0x1b20 net/strparser/strparser.c:221
 strp_recv+0xcf/0x10b net/strparser/strparser.c:343
 tcp_read_sock+0x285/0xa00 net/ipv4/tcp.c:1639
 strp_read_sock+0x14d/0x200 net/strparser/strparser.c:366
 do_strp_work net/strparser/strparser.c:414 [inline]
 strp_work+0xe3/0x130 net/strparser/strparser.c:423
 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269

Fixes: a2c11b0341 ("kcm: use BPF_PROG_RUN")
Fixes: 6cab5e90ab ("bpf: run bpf programs with preemption disabled")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 0355d6c1d5)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Ie65823d4101c1178182a1995f698cf3bfd2b2b70
2020-11-16 09:22:35 +01:00
android ANDROID: GKI: update the ABI xml 2020-10-30 12:21:53 +08:00
arch UPSTREAM: MIPS: VDSO: Fix build for binutils < 2.25 2020-11-16 09:22:34 +01:00
block This is the 4.19.156 stable release 2020-11-10 13:23:09 +01:00
certs export.h: remove VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR() 2018-08-22 23:21:44 +09:00
crypto This is the 4.19.153 stable release 2020-10-29 11:36:20 +01:00
Documentation This is the 4.19.155 stable release 2020-11-05 14:02:27 +01:00
drivers UPSTREAM: virt_wifi: fix refcnt leak in module exit routine 2020-11-16 09:22:34 +01:00
firmware Fix built-in early-load Intel microcode alignment 2020-01-23 08:21:29 +01:00
fs UPSTREAM: fscrypt: restrict IV_INO_LBLK_* to AES-256-XTS 2020-11-15 15:06:09 +01:00
include UPSTREAM: raid6/test: fix a compilation error 2020-11-16 09:22:34 +01:00
init This is the 4.19.155 stable release 2020-11-05 14:02:27 +01:00
ipc Revert "ANDROID: vfs: Add permission2 for filesystems with per mount permissions" 2020-06-27 15:17:42 +02:00
kernel UPSTREAM: sched/topology: Allow sched_asym_cpucapacity to be disabled 2020-11-16 09:22:34 +01:00
lib This is the 4.19.156 stable release 2020-11-10 13:23:09 +01:00
LICENSES LICENSES: Remove CC-BY-SA-4.0 license text 2018-10-18 11:28:50 +02:00
mm UPSTREAM: mm/filemap.c: don't bother dropping mmap_sem for zero size readahead 2020-11-16 07:43:08 +01:00
net UPSTREAM: kcm: disable preemption in kcm_parse_func_strparser() 2020-11-16 09:22:35 +01:00
samples This is the 4.19.154 stable release 2020-10-30 11:43:26 +01:00
scripts UPSTREAM: scripts/tools-support-relr.sh: un-quote variables 2020-11-16 09:22:34 +01:00
security UPSTREAM: selinux: ensure the policy has been loaded before reading the sidtab stats 2020-11-16 09:22:34 +01:00
sound This is the 4.19.156 stable release 2020-11-10 13:23:09 +01:00
tools This is the 4.19.156 stable release 2020-11-10 13:23:09 +01:00
usr initramfs: restore default compression behavior 2020-04-13 10:44:59 +02:00
virt KVM: arm64: Assume write fault on S1PTW permission fault on instruction fetch 2020-10-01 13:14:54 +02:00
.clang-format clang-format: Set IndentWrappedFunctionNames false 2018-08-01 18:38:51 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap libnvdimm-for-4.19_misc 2018-08-25 18:13:10 -07:00
build.config.aarch64 Revert "ANDROID: Kbuild, LLVMLinux: allow overriding clang target triple" 2020-11-10 11:47:24 -08:00
build.config.allmodconfig Revert "ANDROID: Kbuild, LLVMLinux: allow overriding clang target triple" 2020-11-10 11:47:24 -08:00
build.config.allmodconfig.aarch64 ANDROID: drop KERNEL_DIR setting in build.config.common 2020-09-25 15:14:51 +08:00
build.config.allmodconfig.arm ANDROID: drop KERNEL_DIR setting in build.config.common 2020-09-25 15:14:51 +08:00
build.config.allmodconfig.x86_64 ANDROID: drop KERNEL_DIR setting in build.config.common 2020-09-25 15:14:51 +08:00
build.config.arm Revert "ANDROID: Kbuild, LLVMLinux: allow overriding clang target triple" 2020-11-10 11:47:24 -08:00
build.config.common ANDROID: clang: update to 11.0.5 2020-10-27 11:18:23 -07:00
build.config.gki ANDROID: gki: Removed cf modules from gki_defconfig 2020-01-31 16:23:38 -08:00
build.config.gki_kasan ANDROID: drop KERNEL_DIR setting in build.config.common 2020-09-25 15:14:51 +08:00
build.config.gki_kasan.aarch64 ANDROID: drop KERNEL_DIR setting in build.config.common 2020-09-25 15:14:51 +08:00
build.config.gki_kasan.x86_64 ANDROID: drop KERNEL_DIR setting in build.config.common 2020-09-25 15:14:51 +08:00
build.config.gki-debug.aarch64 ANDROID: drop KERNEL_DIR setting in build.config.common 2020-09-25 15:14:51 +08:00
build.config.gki-debug.x86_64 ANDROID: drop KERNEL_DIR setting in build.config.common 2020-09-25 15:14:51 +08:00
build.config.gki.aarch64 ANDROID: GKI: prevent removal of monitored symbols 2020-09-29 11:48:43 +01:00
build.config.gki.x86_64 ANDROID: drop KERNEL_DIR setting in build.config.common 2020-09-25 15:14:51 +08:00
build.config.x86_64 Revert "ANDROID: Kbuild, LLVMLinux: allow overriding clang target triple" 2020-11-10 11:47:24 -08:00
COPYING
CREDITS 9p: remove Ron Minnich from MAINTAINERS 2018-08-17 16:20:26 -07:00
Kbuild
Kconfig kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt 2018-08-02 08:06:55 +09:00
MAINTAINERS UPSTREAM: net: WireGuard secure network tunnel 2020-10-25 11:48:12 +01:00
Makefile This is the 4.19.157 stable release 2020-11-11 11:16:11 +01:00
README

README 

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

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

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.