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Theodore Ts'o d666dfaa57 ext4: don't BUG if someone dirty pages without asking ext4 first 
[ Upstream commit cc5095747e ]

[un]pin_user_pages_remote is dirtying pages without properly warning
the file system in advance.  A related race was noted by Jan Kara in
2018[1]; however, more recently instead of it being a very hard-to-hit
race, it could be reliably triggered by process_vm_writev(2) which was
discovered by Syzbot[2].

This is technically a bug in mm/gup.c, but arguably ext4 is fragile in
that if some other kernel subsystem dirty pages without properly
notifying the file system using page_mkwrite(), ext4 will BUG, while
other file systems will not BUG (although data will still be lost).

So instead of crashing with a BUG, issue a warning (since there may be
potential data loss) and just mark the page as clean to avoid
unprivileged denial of service attacks until the problem can be
properly fixed.  More discussion and background can be found in the
thread starting at [2].

[1] https://lore.kernel.org/linux-mm/20180103100430.GE4911@quack2.suse.cz
[2] https://lore.kernel.org/r/Yg0m6IjcNmfaSokM@google.com

Reported-by: syzbot+d59332e2db681cf18f0318a06e994ebbb529a8db@syzkaller.appspotmail.com
Reported-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Link: https://lore.kernel.org/r/YiDS9wVfq4mM2jGK@mit.edu
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-04-20 09:08:22 +02:00
arch xen: fix is_xen_pmu() 2022-04-20 09:08:21 +02:00
block block: bio-integrity: Advance seed correctly for larger interval sizes 2022-02-08 18:16:28 +01:00
certs certs: Trigger creation of RSA module signing key if it's not an RSA key 2021-09-22 11:45:19 +02:00
crypto crypto: authenc - Fix sleep in atomic context in decrypt_tail 2022-04-20 09:08:12 +02:00
Documentation Documentation: update stable tree link 2022-04-20 09:08:09 +02:00
drivers spi: tegra20: Use of_device_get_match_data() 2022-04-20 09:08:22 +02:00
firmware Fix built-in early-load Intel microcode alignment 2020-01-23 08:20:30 +01:00
fs ext4: don't BUG if someone dirty pages without asking ext4 first 2022-04-20 09:08:22 +02:00
include PCI: Reduce warnings on possible RW1C corruption 2022-04-20 09:08:18 +02:00
init bpf: Add kconfig knob for disabling unpriv bpf by default 2022-02-16 12:44:50 +01:00
ipc ipc: WARN if trying to remove ipc object which is absent 2021-12-08 08:46:53 +01:00
kernel printk: fix return value of printk.devkmsg __setup handler 2022-04-20 09:08:15 +02:00
lib lib/test: use after free in register_test_dev_kmod() 2022-04-20 09:08:21 +02:00
mm mempolicy: mbind_range() set_policy() after vma_merge() 2022-04-20 09:08:10 +02:00
net net/x25: Fix null-ptr-deref caused by x25_disconnect 2022-04-20 09:08:21 +02:00
samples samples/kretprobes: Fix return value if register_kretprobe() failed 2021-11-26 11:40:31 +01:00
scripts Makefile.extrawarn: Move -Wunaligned-access to W=1 2022-02-23 11:57:32 +01:00
security Fix incorrect type in assignment of ipv6 port for audit 2022-04-20 09:08:21 +02:00
sound ASoC: msm8916-wcd-digital: Fix missing clk_disable_unprepare() in msm8916_wcd_digital_probe 2022-04-20 09:08:16 +02:00
tools selftests/x86: Add validity check and allow field splitting 2022-04-20 09:08:12 +02:00
usr initramfs: restore default compression behavior 2020-04-13 10:34:19 +02:00
virt KVM: arm64: Allow SMCCC_ARCH_WORKAROUND_3 to be discovered and migrated 2022-04-02 12:41:10 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore kbuild: rpm-pkg: keep spec file until make mrproper 2018-02-13 10:19:46 +01:00
.mailmap .mailmap: Add Maciej W. Rozycki's Imagination e-mail address 2017-11-10 12:16:15 -08:00
COPYING
CREDITS MAINTAINERS: update TPM driver infrastructure changes 2017-11-09 17:58:40 -08:00
Kbuild
Kconfig
MAINTAINERS MAINTAINERS: Update drm/i915 bug filing URL 2020-02-28 16:36:12 +01:00
Makefile Linux 4.14.275 2022-04-02 12:41:10 +02:00
README

README 

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

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.