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Ye Bin 7000ad53ec f2fs: fix null-ptr-deref in f2fs_get_dnode_of_data [ Upstream commit `4a2c5b7994` ] There is issue as follows when test f2fs atomic write: F2FS-fs (loop0): Can't find valid F2FS filesystem in 2th superblock F2FS-fs (loop0): invalid crc_offset: 0 F2FS-fs (loop0): f2fs_check_nid_range: out-of-range nid=1, run fsck to fix. F2FS-fs (loop0): f2fs_check_nid_range: out-of-range nid=2, run fsck to fix. ================================================================== BUG: KASAN: null-ptr-deref in f2fs_get_dnode_of_data+0xac/0x16d0 Read of size 8 at addr 0000000000000028 by task rep/1990 CPU: 4 PID: 1990 Comm: rep Not tainted 5.19.0-rc6-next-20220715 #266 Call Trace: <TASK> dump_stack_lvl+0x6e/0x91 print_report.cold+0x49a/0x6bb kasan_report+0xa8/0x130 f2fs_get_dnode_of_data+0xac/0x16d0 f2fs_do_write_data_page+0x2a5/0x1030 move_data_page+0x3c5/0xdf0 do_garbage_collect+0x2015/0x36c0 f2fs_gc+0x554/0x1d30 f2fs_balance_fs+0x7f5/0xda0 f2fs_write_single_data_page+0xb66/0xdc0 f2fs_write_cache_pages+0x716/0x1420 f2fs_write_data_pages+0x84f/0x9a0 do_writepages+0x130/0x3a0 filemap_fdatawrite_wbc+0x87/0xa0 file_write_and_wait_range+0x157/0x1c0 f2fs_do_sync_file+0x206/0x12d0 f2fs_sync_file+0x99/0xc0 vfs_fsync_range+0x75/0x140 f2fs_file_write_iter+0xd7b/0x1850 vfs_write+0x645/0x780 ksys_write+0xf1/0x1e0 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd As `3db1de0e58` commit changed atomic write way which new a cow_inode for atomic write file, and also mark cow_inode as FI_ATOMIC_FILE. When f2fs_do_write_data_page write cow_inode will use cow_inode's cow_inode which is NULL. Then will trigger null-ptr-deref. To solve above issue, introduce FI_COW_FILE flag for COW inode. Fiexes: 3db1de0e582c("f2fs: change the current atomic write way") Signed-off-by: Ye Bin <yebin10@huawei.com> Reviewed-by: Chao Yu <chao@kernel.org> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2022-08-25 11:45:53 +02:00
arch	MIPS: tlbex: Explicitly compare _PAGE_NO_EXEC against 0	2022-08-25 11:45:53 +02:00
block	blk-mq: run queue no matter whether the request is the last request	2022-08-25 11:45:36 +02:00
certs	certs: make system keyring depend on x509 parser	2022-07-24 12:53:55 -07:00
crypto	KEYS: asymmetric: enforce SM2 signature use pkey algo	2022-08-17 15:16:17 +02:00
Documentation	powerpc/pseries/mobility: set NMI watchdog factor during an LPM	2022-08-25 11:45:51 +02:00
drivers	video: fbdev: i740fb: Check the argument of i740_calc_vclk()	2022-08-25 11:45:53 +02:00
fs	f2fs: fix null-ptr-deref in f2fs_get_dnode_of_data	2022-08-25 11:45:53 +02:00
include	f2fs: revive F2FS_IOC_ABORT_VOLATILE_WRITE	2022-08-25 11:45:53 +02:00
init	stack: Declare {randomize_,}kstack_offset to fix Sparse warnings	2022-08-17 15:14:14 +02:00
io_uring	io_uring: mem-account pbuf buckets	2022-08-17 15:16:21 +02:00
ipc	ipc: Free mq_sysctls if ipc namespace creation failed	2022-06-22 17:47:41 -05:00
kernel	watchdog: export lockup_detector_reconfigure	2022-08-25 11:45:51 +02:00
lib	lib/list_debug.c: Detect uninitialized lists	2022-08-25 11:45:48 +02:00
LICENSES	LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers	2021-12-16 14:33:10 +01:00
mm	Revert "mm: kfence: apply kmemleak_ignore_phys on early allocated pool"	2022-08-21 15:20:08 +02:00
net	can: j1939: j1939_sk_queue_activate_next_locked(): replace WARN_ON_ONCE with netdev_warn_once()	2022-08-25 11:45:37 +02:00
samples	sample: bpf: xdp_router_ipv4: Allow the kernel to send arp requests	2022-08-17 15:14:25 +02:00
scripts	modules: Ensure natural alignment for .altinstructions and __bug_table sections	2022-08-25 11:45:49 +02:00
security	apparmor: Fix memleak in aa_simple_write_to_buffer()	2022-08-25 11:45:11 +02:00
sound	ALSA: control: Use deferred fasync helper	2022-08-25 11:45:52 +02:00
tools	selftests/kprobe: Do not test for GRP/ without event failures	2022-08-25 11:45:46 +02:00
usr	Not a lot of material this cycle. Many singleton patches against various	2022-05-27 11:22:03 -07:00
virt	KVM: Unconditionally get a ref to /dev/kvm module when creating a VM	2022-08-25 11:45:05 +02:00
.clang-format	clang-format: Fix space after for_each macros	2022-05-20 19:27:16 +02:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	kbuild: split the second line of .mod into .usyms	2022-05-08 03:16:59 +09:00
.mailmap	ARM: SoC fixes for 5.19, part 4	2022-07-27 09:43:07 -07:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: mark ARM/PALM TREO SUPPORT orphan	2022-07-07 15:17:00 +02:00
Kbuild	kbuild: rename hostprogs-y/always to hostprogs/always-y	2020-02-04 01:53:07 +09:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	io_uring: move to separate directory	2022-08-17 15:14:20 +02:00
Makefile	kbuild: fix the modules order between drivers and libs	2022-08-25 11:45:37 +02:00
README	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -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.

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.