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Qu Wenruo 00c6bb4cea btrfs: verify the tranisd of the to-be-written dirty extent buffer 
commit 3777369ff1 upstream.

[BUG]
There is a bug report that a bitflip in the transid part of an extent
buffer makes btrfs to reject certain tree blocks:

  BTRFS error (device dm-0): parent transid verify failed on 1382301696 wanted 262166 found 22

[CAUSE]
Note the failed transid check, hex(262166) = 0x40016, while
hex(22) = 0x16.

It's an obvious bitflip.

Furthermore, the reporter also confirmed the bitflip is from the
hardware, so it's a real hardware caused bitflip, and such problem can
not be detected by the existing tree-checker framework.

As tree-checker can only verify the content inside one tree block, while
generation of a tree block can only be verified against its parent.

So such problem remain undetected.

[FIX]
Although tree-checker can not verify it at write-time, we still have a
quick (but not the most accurate) way to catch such obvious corruption.

Function csum_one_extent_buffer() is called before we submit metadata
write.

Thus it means, all the extent buffer passed in should be dirty tree
blocks, and should be newer than last committed transaction.

Using that we can catch the above bitflip.

Although it's not a perfect solution, as if the corrupted generation is
higher than the correct value, we have no way to catch it at all.

Reported-by: Christoph Anton Mitterer <calestyo@scientia.org>
Link: https://lore.kernel.org/linux-btrfs/2dfcbc130c55cc6fd067b93752e90bd2b079baca.camel@scientia.org/
CC: stable@vger.kernel.org # 5.15+
Signed-off-by: Qu Wenruo <wqu@sus,ree.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-04-08 14:23:02 +02:00
arch DEC: Limit PMAX memory probing to R3k systems 2022-04-08 14:23:02 +02:00
block block: don't merge across cgroup boundaries if blkcg is enabled 2022-04-08 14:22:59 +02:00
certs certs: Add support for using elliptic curve keys for signing modules 2021-08-23 19:55:42 +03:00
crypto crypto: rsa-pkcs1pad - fix buffer overread in pkcs1pad_verify_complete() 2022-04-08 14:23:01 +02:00
Documentation Documentation: update stable tree link 2022-04-08 14:22:51 +02:00
drivers media: davinci: vpif: fix unbalanced runtime PM enable 2022-04-08 14:23:02 +02:00
fs btrfs: verify the tranisd of the to-be-written dirty extent buffer 2022-04-08 14:23:02 +02:00
include pstore: Don't use semaphores in always-atomic-context code 2022-04-08 14:23:01 +02:00
init init: make unknown command line param message clearer 2021-11-18 19:17:11 +01:00
ipc ipc/sem: do not sleep with a spin lock held 2022-02-08 18:34:03 +01:00
kernel tracing: Have trace event string test handle zero length strings 2022-04-08 14:22:57 +02:00
lib lib/raid6/test: fix multiple definition linking error 2022-04-08 14:23:01 +02:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm mm/kmemleak: reset tag when compare object pointer 2022-04-08 14:22:56 +02:00
net rfkill: make new event layout opt-in 2022-04-08 14:23:00 +02:00
samples samples/landlock: Fix path_list memory leak 2022-04-08 14:22:59 +02:00
scripts kconfig: fix failing to generate auto.conf 2022-02-23 12:03:20 +01:00
security landlock: Use square brackets around "landlock-ruleset" 2022-04-08 14:22:59 +02:00
sound ASoC: SOF: Intel: Fix NULL ptr dereference when ENOMEM 2022-04-08 14:22:58 +02:00
tools selftests: vm: fix clang build error multiple output files 2022-04-08 14:22:48 +02:00
usr usr/include/Makefile: add linux/nfc.h to the compile-test coverage 2022-02-01 17:27:15 +01:00
virt KVM: Fix lockdep false negative during host resume 2022-03-16 14:23:40 +01:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig
.get_maintainer.ignore 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 .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: add Andrej Shadura 2021-10-18 20:22:03 -10:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
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 MAINTAINERS: adjust file entry for of_net.c after movement 2022-03-08 19:12:53 +01:00
Makefile Linux 5.15.32 2022-03-28 09:58:46 +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.