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Xiongwei Song 16f2ef98cc floppy: Add max size check for user space request [ Upstream commit `545a32498c` ] We need to check the max request size that is from user space before allocating pages. If the request size exceeds the limit, return -EINVAL. This check can avoid the warning below from page allocator. WARNING: CPU: 3 PID: 16525 at mm/page_alloc.c:5344 current_gfp_context include/linux/sched/mm.h:195 [inline] WARNING: CPU: 3 PID: 16525 at mm/page_alloc.c:5344 __alloc_pages+0x45d/0x500 mm/page_alloc.c:5356 Modules linked in: CPU: 3 PID: 16525 Comm: syz-executor.3 Not tainted 5.15.0-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 RIP: 0010:__alloc_pages+0x45d/0x500 mm/page_alloc.c:5344 Code: be c9 00 00 00 48 c7 c7 20 4a 97 89 c6 05 62 32 a7 0b 01 e8 74 9a 42 07 e9 6a ff ff ff 0f 0b e9 a0 fd ff ff 40 80 e5 3f eb 88 <0f> 0b e9 18 ff ff ff 4c 89 ef 44 89 e6 45 31 ed e8 1e 76 ff ff e9 RSP: 0018:ffffc90023b87850 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 1ffff92004770f0b RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000033 RDI: 0000000000010cc1 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff81bb4686 R11: 0000000000000001 R12: ffffffff902c1960 R13: 0000000000000033 R14: 0000000000000000 R15: ffff88804cf64a30 FS: 0000000000000000(0000) GS:ffff88802cd00000(0063) knlGS:00000000f44b4b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000000002c921000 CR3: 000000004f507000 CR4: 0000000000150ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> alloc_pages+0x1a7/0x300 mm/mempolicy.c:2191 __get_free_pages+0x8/0x40 mm/page_alloc.c:5418 raw_cmd_copyin drivers/block/floppy.c:3113 [inline] raw_cmd_ioctl drivers/block/floppy.c:3160 [inline] fd_locked_ioctl+0x12e5/0x2820 drivers/block/floppy.c:3528 fd_ioctl drivers/block/floppy.c:3555 [inline] fd_compat_ioctl+0x891/0x1b60 drivers/block/floppy.c:3869 compat_blkdev_ioctl+0x3b8/0x810 block/ioctl.c:662 __do_compat_sys_ioctl+0x1c7/0x290 fs/ioctl.c:972 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c Reported-by: syzbot+23a02c7df2cf2bc93fa2@syzkaller.appspotmail.com Link: https://lore.kernel.org/r/20211116131033.27685-1-sxwjean@me.com Signed-off-by: Xiongwei Song <sxwjean@gmail.com> Signed-off-by: Denis Efremov <efremov@linux.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-01-27 09:19:42 +01:00
arch	ARM: shmobile: rcar-gen2: Add missing of_node_put()	2022-01-27 09:19:40 +01:00
block	block: fix ioprio_get(IOPRIO_WHO_PGRP) vs setuid(2)	2021-12-14 14:49:02 +01:00
certs	certs: Trigger creation of RSA module signing key if it's not an RSA key	2021-09-15 09:47:29 +02:00
crypto	crypto: pcrypt - Delay write to padata->info	2021-11-17 09:48:40 +01:00
Documentation	Input: i8042 - add deferred probe support	2022-01-05 12:37:43 +01:00
drivers	floppy: Add max size check for user space request	2022-01-27 09:19:42 +01:00
fs	fs: dlm: filter user dlm messages for kernel locks	2022-01-27 09:19:40 +01:00
include	mm_zone: add function to check if managed dma zone exists	2022-01-27 09:19:28 +01:00
init	kbuild: add CONFIG_LD_IS_LLD	2021-06-30 08:47:44 -04:00
ipc	shm: extend forced shm destroy to support objects from several IPC nses	2021-12-01 09:23:35 +01:00
kernel	rcu/exp: Mark current CPU as exp-QS in IPI loop second pass	2022-01-27 09:19:33 +01:00
lib	siphash: use _unaligned version by default	2021-12-08 09:01:12 +01:00
LICENSES	LICENSES: Rename other to deprecated	2019-05-03 06:34:32 -06:00
mm	shmem: fix a race between shmem_unused_huge_shrink and shmem_evict_inode	2022-01-27 09:19:29 +01:00
net	batman-adv: allow netlink usage in unprivileged containers	2022-01-27 09:19:41 +01:00
samples	samples/kretprobes: Fix return value if register_kretprobe() failed	2021-11-17 09:48:39 +01:00
scripts	recordmcount.pl: fix typo in s390 mcount regex	2022-01-05 12:37:44 +01:00
security	selinux: fix potential memleak in selinux_add_opt()	2022-01-27 09:19:35 +01:00
sound	ASoC: samsung: idma: Check of ioremap return value	2022-01-27 09:19:39 +01:00
tools	bpftool: Enable line buffering for stdout	2022-01-27 09:19:35 +01:00
usr	initramfs: restore default compression behavior	2020-04-08 09:08:38 +02:00
virt	KVM: do not shrink halt_poll_ns below grow_start	2021-10-09 14:39:50 +02:00
.clang-format	clang-format: Update with the latest for_each macro list	2019-08-31 10:00:51 +02:00
.cocciconfig
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes
.gitignore	Modules updates for v5.4	2019-09-22 10:34:46 -07:00
.mailmap	ARM: SoC fixes	2019-11-10 13:41:59 -08:00
COPYING
CREDITS	MAINTAINERS: Remove Simon as Renesas SoC Co-Maintainer	2019-10-10 08:12:51 -07:00
Kbuild	kbuild: do not descend to ./Kbuild when cleaning	2019-08-21 21:03:58 +09:00
Kconfig	docs: kbuild: convert docs to ReST and rename to *.rst	2019-06-14 14:21:21 -06:00
MAINTAINERS	Documentation/llvm: add documentation on building w/ Clang/LLVM	2020-08-26 10:40:46 +02:00
Makefile	Linux 5.4.173	2022-01-20 09:19:19 +01:00
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.