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Ryusuke Konishi 8fa90634ec nilfs2: fix potential bug in end_buffer_async_write 
commit 5bc09b397c upstream.

According to a syzbot report, end_buffer_async_write(), which handles the
completion of block device writes, may detect abnormal condition of the
buffer async_write flag and cause a BUG_ON failure when using nilfs2.

Nilfs2 itself does not use end_buffer_async_write().  But, the async_write
flag is now used as a marker by commit 7f42ec3941 ("nilfs2: fix issue
with race condition of competition between segments for dirty blocks") as
a means of resolving double list insertion of dirty blocks in
nilfs_lookup_dirty_data_buffers() and nilfs_lookup_node_buffers() and the
resulting crash.

This modification is safe as long as it is used for file data and b-tree
node blocks where the page caches are independent.  However, it was
irrelevant and redundant to also introduce async_write for segment summary
and super root blocks that share buffers with the backing device.  This
led to the possibility that the BUG_ON check in end_buffer_async_write
would fail as described above, if independent writebacks of the backing
device occurred in parallel.

The use of async_write for segment summary buffers has already been
removed in a previous change.

Fix this issue by removing the manipulation of the async_write flag for
the remaining super root block buffer.

Link: https://lkml.kernel.org/r/20240203161645.4992-1-konishi.ryusuke@gmail.com
Fixes: 7f42ec3941 ("nilfs2: fix issue with race condition of competition between segments for dirty blocks")
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Reported-by: syzbot+5c04210f7c7f897c1e7f@syzkaller.appspotmail.com
Closes: https://lkml.kernel.org/r/00000000000019a97c05fd42f8c8@google.com
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-02-23 08:55:14 +01:00
arch x86/mm/ident_map: Use gbpages only where full GB page should be mapped. 2024-02-23 08:55:08 +01:00
block blk-iocost: Fix an UBSAN shift-out-of-bounds warning 2024-02-23 08:54:59 +01:00
certs
crypto crypto: api - Disallow identical driver names 2024-02-23 08:54:23 +01:00
Documentation net: sysfs: Fix /sys/class/net/<iface> path for statistics 2024-02-23 08:55:02 +01:00
drivers fbdev: flush deferred IO before closing 2024-02-23 08:55:13 +01:00
fs nilfs2: fix potential bug in end_buffer_async_write 2024-02-23 08:55:14 +01:00
include netfilter: ipset: fix performance regression in swap operation 2024-02-23 08:55:14 +01:00
init rootfs: Fix support for rootfstype= when root= is given 2024-01-25 14:52:48 -08:00
io_uring io_uring/rw: ensure io->bytes_done is always initialized 2024-01-25 14:52:48 -08:00
ipc
kernel sched/membarrier: reduce the ability to hammer on sys_membarrier 2024-02-23 08:55:14 +01:00
lib crypto: lib/mpi - Fix unexpected pointer access in mpi_ec_init 2024-02-23 08:55:11 +01:00
LICENSES
mm mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again 2024-02-23 08:55:03 +01:00
net netfilter: ipset: Missing gc cancellations fixed 2024-02-23 08:55:14 +01:00
samples samples/hw_breakpoint: fix building without module unloading 2023-09-23 11:10:01 +02:00
scripts scripts/decode_stacktrace.sh: optionally use LLVM utilities 2024-02-23 08:55:13 +01:00
security lsm: fix the logic in security_inode_getsecctx() 2024-02-23 08:55:05 +01:00
sound ALSA: hda/conexant: Add quirk for SWS JS201D 2024-02-23 08:55:08 +01:00
tools selftests: net: avoid just another constant wait 2024-02-23 08:54:57 +01:00
usr
virt KVM: Grab a reference to KVM for VM and vCPU stats file descriptors 2023-08-03 10:22:40 +02:00
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MAINTAINERS iio: stx104: Move to addac subdirectory 2023-08-26 14:23:27 +02:00
Makefile Linux 5.15.148 2024-01-25 14:52:56 -08:00
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.