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Guo Xuenan 694d94b5aa fs: fix an infinite loop in iomap_fiemap [ Upstream commit `49df342218` ] when get fiemap starting from MAX_LFS_FILESIZE, (maxbytes - len) < start will always true , then len set zero. because of start offset is beyond file size, for erofs filesystem it will always return iomap.length with zero,iomap iterate will enter infinite loop. it is necessary cover this corner case to avoid this situation. ------------[ cut here ]------------ WARNING: CPU: 7 PID: 905 at fs/iomap/iter.c:35 iomap_iter+0x97f/0xc70 Modules linked in: xfs erofs CPU: 7 PID: 905 Comm: iomap Tainted: G W 5.17.0-rc8 #27 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:iomap_iter+0x97f/0xc70 Code: 85 a1 fc ff ff e8 71 be 9c ff 0f 1f 44 00 00 e9 92 fc ff ff e8 62 be 9c ff 0f 0b b8 fb ff ff ff e9 fc f8 ff ff e8 51 be 9c ff <0f> 0b e9 2b fc ff ff e8 45 be 9c ff 0f 0b e9 e1 fb ff ff e8 39 be RSP: 0018:ffff888060a37ab0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff888060a37bb0 RCX: 0000000000000000 RDX: ffff88807e19a900 RSI: ffffffff81a7da7f RDI: ffff888060a37be0 RBP: 7fffffffffffffff R08: 0000000000000000 R09: ffff888060a37c20 R10: ffff888060a37c67 R11: ffffed100c146f8c R12: 7fffffffffffffff R13: 0000000000000000 R14: ffff888060a37bd8 R15: ffff888060a37c20 FS: 00007fd3cca01540(0000) GS:ffff888108780000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020010820 CR3: 0000000054b92000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> iomap_fiemap+0x1c9/0x2f0 erofs_fiemap+0x64/0x90 [erofs] do_vfs_ioctl+0x40d/0x12e0 __x64_sys_ioctl+0xaa/0x1c0 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae </TASK> ---[ end trace 0000000000000000 ]--- watchdog: BUG: soft lockup - CPU#7 stuck for 26s! [iomap:905] Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Guo Xuenan <guoxuenan@huawei.com> Reviewed-by: Christoph Hellwig <hch@lst.de> [djwong: fix some typos] Reviewed-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-05-25 09:59:01 +02:00
arch	s390/pci: improve zpci_dev reference counting	2022-05-25 09:59:00 +02:00
block	Revert "block: inherit request start time from bio for BLK_CGROUP"	2022-05-09 09:16:29 +02:00
certs	certs: Fix build error when CONFIG_MODULE_SIG_KEY is empty	2022-01-23 00:08:44 +09:00
crypto	crypto: xts - Add softdep on ecb	2022-04-08 13:58:36 +02:00
Documentation	dt-bindings: pci: apple,pcie: Drop max-link-speed from example	2022-05-12 12:32:38 +02:00
drivers	rtc: mc146818-lib: Fix the AltCentury for AMD platforms	2022-05-25 09:59:01 +02:00
fs	fs: fix an infinite loop in iomap_fiemap	2022-05-25 09:59:01 +02:00
include	rtc: mc146818-lib: Fix the AltCentury for AMD platforms	2022-05-25 09:59:01 +02:00
init	init/main.c: return 1 from handled __setup() functions	2022-04-13 19:27:23 +02:00
ipc	ipc/sem: do not sleep with a spin lock held	2022-02-04 09:25:05 -08:00
kernel	cgroup/cpuset: Remove cpus_allowed/mems_allowed setup in cpuset_init_smp()	2022-05-18 10:28:22 +02:00
lib	dim: initialize all struct fields	2022-05-18 10:28:14 +02:00
LICENSES
mm	mm/kfence: reset PG_slab and memcg_data before freeing __kfence_pool	2022-05-18 10:28:23 +02:00
net	SUNRPC: Ensure that the gssproxy client can start in a connected state	2022-05-18 10:28:22 +02:00
samples	samples/bpf, xdpsock: Fix race when running for fix duration of time	2022-04-08 13:58:18 +02:00
scripts	kconfig: add fflush() before ferror() check	2022-05-25 09:58:59 +02:00
security	Fix incorrect type in assignment of ipv6 port for audit	2022-04-08 13:58:37 +02:00
sound	ALSA: hda/realtek: Enable headset mic on Lenovo P360	2022-05-25 09:59:00 +02:00
tools	tools/virtio: compile with -pthread	2022-05-25 09:59:00 +02:00
usr	kbuild: remove include/linux/cyclades.h from header file check	2022-01-27 08:51:08 +01:00
virt	KVM: avoid NULL pointer dereference in kvm_dirty_ring_push	2022-04-13 19:27:41 +02:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap	MAINTAINERS: Update Jisheng's email address	2022-03-08 17:30:32 +01:00
COPYING
CREDITS	MAINTAINERS: replace a Microchip AT91 maintainer	2022-02-09 11:30:01 +01:00
Kbuild
Kconfig
MAINTAINERS	net: dsa: realtek-smi: move to subdirectory	2022-04-08 13:58:12 +02:00
Makefile	Linux 5.17.9	2022-05-18 10:28:23 +02:00
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.

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.