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Jamie Iles 3b0503e308 f2fs: wait for sysfs kobject removal before freeing f2fs_sb_info [ Upstream commit `ae284d87ab` ] syzkaller found that with CONFIG_DEBUG_KOBJECT_RELEASE=y, unmounting an f2fs filesystem could result in the following splat: kobject: 'loop5' ((____ptrval____)): kobject_release, parent 0000000000000000 (delayed 250) kobject: 'f2fs_xattr_entry-7:5' ((____ptrval____)): kobject_release, parent 0000000000000000 (delayed 750) ------------[ cut here ]------------ ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x98 WARNING: CPU: 0 PID: 699 at lib/debugobjects.c:485 debug_print_object+0x180/0x240 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 699 Comm: syz-executor.5 Tainted: G S 5.9.0-rc8+ #101 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace+0x0/0x4d8 show_stack+0x34/0x48 dump_stack+0x174/0x1f8 panic+0x360/0x7a0 __warn+0x244/0x2ec report_bug+0x240/0x398 bug_handler+0x50/0xc0 call_break_hook+0x160/0x1d8 brk_handler+0x30/0xc0 do_debug_exception+0x184/0x340 el1_dbg+0x48/0xb0 el1_sync_handler+0x170/0x1c8 el1_sync+0x80/0x100 debug_print_object+0x180/0x240 debug_check_no_obj_freed+0x200/0x430 slab_free_freelist_hook+0x190/0x210 kfree+0x13c/0x460 f2fs_put_super+0x624/0xa58 generic_shutdown_super+0x120/0x300 kill_block_super+0x94/0xf8 kill_f2fs_super+0x244/0x308 deactivate_locked_super+0x104/0x150 deactivate_super+0x118/0x148 cleanup_mnt+0x27c/0x3c0 __cleanup_mnt+0x28/0x38 task_work_run+0x10c/0x248 do_notify_resume+0x9d4/0x1188 work_pending+0x8/0x34c Like the error handling for f2fs_register_sysfs(), we need to wait for the kobject to be destroyed before returning to prevent a potential use-after-free. Fixes: `bf9e697ecd` ("f2fs: expose features to sysfs entry") Cc: Jaegeuk Kim <jaegeuk@kernel.org> Cc: Chao Yu <chao@kernel.org> Signed-off-by: Jamie Iles <jamie@nuviainc.com> Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2020-10-30 10:38:20 +01:00
arch	powerpc/perf/hv-gpci: Fix starting index value	2020-10-30 10:38:20 +01:00
block	block: ensure bdi->io_pages is always initialized	2020-09-12 13:40:22 +02:00
certs	export.h: remove VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR()	2018-08-22 23:21:44 +09:00
crypto	crypto: algif_skcipher - EBUSY on aio should be an error	2020-10-29 09:55:01 +01:00
Documentation	x86/fpu: Allow multiple bits in clearcpuid= parameter	2020-10-29 09:55:00 +01:00
drivers	IB/rdmavt: Fix sizeof mismatch	2020-10-30 10:38:20 +01:00
firmware	Fix built-in early-load Intel microcode alignment	2020-01-23 08:21:29 +01:00
fs	f2fs: wait for sysfs kobject removal before freeing f2fs_sb_info	2020-10-30 10:38:20 +01:00
include	overflow: Include header file with SIZE_MAX declaration	2020-10-30 10:38:20 +01:00
init	printk: queue wake_up_klogd irq_work only if per-CPU areas are ready	2020-07-22 09:32:13 +02:00
ipc	ipc/util.c: sysvipc_find_ipc() incorrectly updates position index	2020-05-20 08:18:40 +02:00
kernel	kdb: Fix pager search for multi-line strings	2020-10-30 10:38:20 +01:00
lib	Fonts: Support FONT_EXTRA_WORDS macros for built-in fonts	2020-10-14 10:31:21 +02:00
LICENSES	LICENSES: Remove CC-BY-SA-4.0 license text	2018-10-18 11:28:50 +02:00
mm	mm, oom_adj: don't loop through tasks in __set_oom_adj when not necessary	2020-10-29 09:55:15 +01:00
net	netfilter: nf_log: missing vlan offload tag and proto	2020-10-29 09:55:15 +01:00
samples	samples: bpf: Fix build error	2020-06-03 08:19:31 +02:00
scripts	checkpatch: fix the usage of capture group ( ... )	2020-09-09 19:04:32 +02:00
security	ima: Don't ignore errors from crypto_shash_update()	2020-10-29 09:54:59 +01:00
sound	ALSA: seq: oss: Avoid mutex lock for a long-time ioctl	2020-10-29 09:55:11 +01:00
tools	perf intel-pt: Fix "context_switch event has no tid" error	2020-10-30 10:38:19 +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	Kbuild updates for v4.17 (2nd)	2018-04-15 17:21:30 -07:00
.mailmap	libnvdimm-for-4.19_misc	2018-08-25 18:13:10 -07:00
COPYING	COPYING: use the new text with points to the license files	2018-03-23 12:41:45 -06:00
CREDITS	9p: remove Ron Minnich from MAINTAINERS	2018-08-17 16:20:26 -07:00
Kbuild	Kbuild updates for v4.15	2017-11-17 17:45:29 -08:00
Kconfig	kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt	2018-08-02 08:06:55 +09:00
MAINTAINERS	Documentation/llvm: add documentation on building w/ Clang/LLVM	2020-09-26 18:01:31 +02:00
Makefile	Linux 4.19.153	2020-10-29 09:55:18 +01:00
README	Docs: Added a pointer to the formatted docs to README	2018-03-21 09:02:53 -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 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.