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Uladzislau Rezki (Sony) 5ced426d97 rcu/kvfree: Fix data-race in __mod_timer / kvfree_call_rcu [ Upstream commit `a23da88c6c` ] KCSAN reports a data race when access the krcp->monitor_work.timer.expires variable in the schedule_delayed_monitor_work() function: <snip> BUG: KCSAN: data-race in __mod_timer / kvfree_call_rcu read to 0xffff888237d1cce8 of 8 bytes by task 10149 on cpu 1: schedule_delayed_monitor_work kernel/rcu/tree.c:3520 [inline] kvfree_call_rcu+0x3b8/0x510 kernel/rcu/tree.c:3839 trie_update_elem+0x47c/0x620 kernel/bpf/lpm_trie.c:441 bpf_map_update_value+0x324/0x350 kernel/bpf/syscall.c:203 generic_map_update_batch+0x401/0x520 kernel/bpf/syscall.c:1849 bpf_map_do_batch+0x28c/0x3f0 kernel/bpf/syscall.c:5143 __sys_bpf+0x2e5/0x7a0 __do_sys_bpf kernel/bpf/syscall.c:5741 [inline] __se_sys_bpf kernel/bpf/syscall.c:5739 [inline] __x64_sys_bpf+0x43/0x50 kernel/bpf/syscall.c:5739 x64_sys_call+0x2625/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f write to 0xffff888237d1cce8 of 8 bytes by task 56 on cpu 0: __mod_timer+0x578/0x7f0 kernel/time/timer.c:1173 add_timer_global+0x51/0x70 kernel/time/timer.c:1330 __queue_delayed_work+0x127/0x1a0 kernel/workqueue.c:2523 queue_delayed_work_on+0xdf/0x190 kernel/workqueue.c:2552 queue_delayed_work include/linux/workqueue.h:677 [inline] schedule_delayed_monitor_work kernel/rcu/tree.c:3525 [inline] kfree_rcu_monitor+0x5e8/0x660 kernel/rcu/tree.c:3643 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3310 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3391 kthread+0x1d1/0x210 kernel/kthread.c:389 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 56 Comm: kworker/u8:4 Not tainted 6.12.0-rc2-syzkaller-00050-g5b7c893ed5ed #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: events_unbound kfree_rcu_monitor <snip> kfree_rcu_monitor() rearms the work if a "krcp" has to be still offloaded and this is done without holding krcp->lock, whereas the kvfree_call_rcu() holds it. Fix it by acquiring the "krcp->lock" for kfree_rcu_monitor() so both functions do not race anymore. Reported-by: syzbot+061d370693bdd99f9d34@syzkaller.appspotmail.com Link: https://lore.kernel.org/lkml/ZxZ68KmHDQYU0yfD@pc636/T/ Fixes: `8fc5494ad5` ("rcu/kvfree: Move need_offload_krc() out of krcp->lock") Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com> Reviewed-by: Neeraj Upadhyay <Neeraj.Upadhyay@amd.com> Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2024-12-05 14:01:19 +01:00
arch	s390/syscalls: Avoid creation of arch/arch/ directory	2024-12-05 14:01:14 +01:00
block	block: fix bio_split_rw_at to take zone_write_granularity into account	2024-12-05 14:01:14 +01:00
certs	sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3	2024-09-20 19:52:48 +03:00
crypto	crypto: pcrypt - Call crypto layer directly when padata_do_parallel() return -EBUSY	2024-12-05 14:01:18 +01:00
Documentation	doc: rcu: update printed dynticks counter bits	2024-12-05 14:01:19 +01:00
drivers	crypto: inside-secure - Fix the return value of safexcel_xcbcmac_cra_init()	2024-12-05 14:01:19 +01:00
fs	ext4: fix race in buffer_head read fault injection	2024-12-05 14:01:15 +01:00
include	crypto: hisilicon/qm - disable same error report before resetting	2024-12-05 14:01:18 +01:00
init	initramfs: avoid filename buffer overrun	2024-12-05 14:01:12 +01:00
io_uring	io_uring/rw: fix missing NOWAIT check for O_DIRECT start write	2024-10-31 08:21:02 -06:00
ipc	struct fd layout change (and conversion to accessor helpers)	2024-09-23 09:35:36 -07:00
kernel	rcu/kvfree: Fix data-race in __mod_timer / kvfree_call_rcu	2024-12-05 14:01:19 +01:00
lib	objpool: fix to make percpu slot allocation more robust	2024-11-07 14:14:58 -08:00
LICENSES	LICENSES: add 0BSD license text	2024-09-01 20:43:24 -07:00
mm	mm/mmap: fix __mmap_region() error handling in rare merge failure case	2024-11-22 15:30:26 +01:00
net	hv_sock: Initializing vsk->trans to NULL to prevent a dangling pointer	2024-11-22 15:30:25 +01:00
rust	Driver core fix for 6.12-rc3	2024-10-13 09:10:52 -07:00
samples	Including fixes from bluetooth.	2024-11-14 10:05:33 -08:00
scripts	Kbuild fixes for v6.12 (2nd)	2024-11-03 08:29:02 -10:00
security	integrity-v6.12	2024-11-12 13:06:31 -08:00
sound	ASoC: Fixes for v6.12	2024-11-14 16:40:15 +01:00
tools	kselftest/arm64: Fix encoding for SVE B16B16 test	2024-12-05 14:01:13 +01:00
usr	initramfs: shorten cmd_initfs in usr/Makefile	2024-07-16 01:07:52 +09:00
virt	ARM64:	2024-10-21 11:22:04 -07:00
.clang-format	clang-format: Update with v6.11-rc1's `for_each` macro list	2024-08-02 13:20:31 +02:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.editorconfig	.editorconfig: remove trim_trailing_whitespace option	2024-06-13 16:47:52 +02:00
.get_maintainer.ignore	Add Jeff Kirsher to .get_maintainer.ignore	2024-03-08 11:36:54 +00:00
.gitattributes	.gitattributes: set diff driver for Rust source code files	2023-05-31 17:48:25 +02:00
.gitignore	Kbuild updates for v6.12	2024-09-24 13:02:06 -07:00
.mailmap	mailmap: add entry for Thorsten Blum	2024-11-07 14:14:59 -08:00
.rustfmt.toml	rust: add `.rustfmt.toml`	2022-09-28 09:02:20 +02:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: Remove self from DSA entry	2024-11-03 12:52:38 -08:00
Kbuild	Kbuild updates for v6.1	2022-10-10 12:00:45 -07:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	MAINTAINERS: appoint myself the XFS maintainer for 6.12 LTS	2024-12-05 14:01:10 +01:00
Makefile	Linux 6.12.1	2024-11-22 15:30:26 +01:00
README	README: Fix spelling	2024-03-18 03:36:32 -06:00

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 reStructuredText markup notation.

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.