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Theodore Ts'o c764e8fa44 ext4: fix race writing to an inline_data file while its xattrs are changing 
commit a54c4613da upstream.

The location of the system.data extended attribute can change whenever
xattr_sem is not taken.  So we need to recalculate the i_inline_off
field since it mgiht have changed between ext4_write_begin() and
ext4_write_end().

This means that caching i_inline_off is probably not helpful, so in
the long run we should probably get rid of it and shrink the in-memory
ext4 inode slightly, but let's fix the race the simple way for now.

Cc: stable@kernel.org
Fixes: f19d5870cb ("ext4: add normal write support for inline data")
Reported-by: syzbot+13146364637c7363a7de@syzkaller.appspotmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-09-08 08:50:19 +02:00
arch Revert "parisc: Add assembly implementations for memset, strlen, strcpy, strncpy and strcat" 2021-09-03 10:23:07 +02:00
block blk-mq: don't grab rq's refcount in blk_mq_check_expired() 2021-09-03 10:23:03 +02:00
certs Kbuild updates for v5.13 (2nd) 2021-05-08 10:00:11 -07:00
crypto crypto: sm2 - fix a memory leak in sm2 2021-07-14 17:06:44 +02:00
Documentation dt-bindings: sifive-l2-cache: Fix 'select' matching 2021-09-03 10:22:47 +02:00
drivers platform/x86: Make dual_accel_detect() KIOX010A + KIOX020A detect more robust 2021-09-03 10:23:08 +02:00
fs ext4: fix race writing to an inline_data file while its xattrs are changing 2021-09-08 08:50:19 +02:00
include net: don't unconditionally copy_from_user a struct ifreq for socket ioctls 2021-09-03 10:23:08 +02:00
init sched/core: Initialize the idle task with preemption disabled 2021-07-14 17:06:21 +02:00
ipc ipc/mqueue, msg, sem: avoid relying on a stack reference past its expiry 2021-05-22 15:09:07 -10:00
kernel audit: move put_tree() to avoid trim_trees refcount underflow and UAF 2021-09-03 10:23:08 +02:00
lib once: Fix panic when module unload 2021-09-03 10:22:46 +02:00
LICENSES LICENSES: Add the CC-BY-4.0 license 2020-12-08 10:33:27 -07:00
mm mm/memory_hotplug: fix potential permanent lru cache disable 2021-09-03 10:22:48 +02:00
net net: don't unconditionally copy_from_user a struct ifreq for socket ioctls 2021-09-03 10:23:08 +02:00
samples bpf, samples: Fix xdpsock with '-M' parameter missing unload process 2021-07-28 14:37:21 +02:00
scripts scripts/tracing: fix the bug that can't parse raw_trace_func 2021-08-12 13:32:16 +02:00
security bpf: Add lockdown check for probe_write_user helper 2021-08-15 14:01:56 +02:00
sound ASoC: component: Remove misplaced prefix handling in pin control functions 2021-09-03 10:22:44 +02:00
tools tools/virtio: fix build 2021-09-03 10:23:01 +02:00
usr .gitignore: prefix local generated files with a slash 2021-05-02 00:43:35 +09:00
virt KVM: Do not leak memory for duplicate debugfs directories 2021-08-12 13:32:23 +02:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: add Marek's other e-mail address and identity without diacritics 2021-06-24 19:40:54 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: move Murali Karicheri to credits 2021-04-29 15:47:30 -07:00
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 Merge branch 'akpm' (patches from Andrew) 2021-06-25 11:05:03 -07:00
Makefile Linux 5.13.14 2021-09-03 10:23:08 +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.