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Gao Xiang f9e69b33fd erofs: avoid reading more for fragment maps 
[ Upstream commit 334c0e493c ]

Since all real encoded extents (directly handled by the decompression
subsystem) have a sane, limited maximum decoded length
(Z_EROFS_PCLUSTER_MAX_DSIZE), and the read-more policy is only applied
if needed.

However, it makes no sense to read more for non-encoded maps, such as
fragment extents, since such extents can be huge (up to i_size) and
there is no benefit to reading more at this layer.

For normal images, it does not really matter, but for crafted images
generated by syzbot, excessively large fragment extents can cause
read-more to run for an overly long time.

Reported-and-tested-by: syzbot+1a9af3ef3c84c5e14dcc@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/r/68c8583d.050a0220.2ff435.03a3.GAE@google.com
Fixes: b44686c839 ("erofs: fix large fragment handling")
Fixes: b15b2e307c ("erofs: support on-disk compressed fragments data")
Reviewed-by: Hongbo Li <lihongbo22@huawei.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-10-15 12:03:16 +02:00
arch
block
certs
crypto
Documentation i2c-for-6.17-rc8 2025-09-28 13:19:23 -07:00
drivers
fs
include
init
io_uring
ipc
kernel uprobes: uprobe_warn should use passed task 2025-10-15 12:03:16 +02:00
lib raid6: riscv: Clean up unused header file inclusion 2025-10-15 12:03:16 +02:00
LICENSES
mm mm: swap: check for stable address space before operating on the VMA 2025-10-06 11:20:05 +02:00
net net/9p: fix double req put in p9_fd_cancelled 2025-10-12 13:01:57 +02:00
rust
samples 15 hotfixes. 11 are cc:stable and the remainder address post-6.16 issues 2025-09-17 21:34:26 -07:00
scripts
security
sound
tools
usr
virt
.clang-format Linux 6.15-rc5 2025-05-06 16:39:25 +10:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-07 00:11:47 +02:00
.cocciconfig
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: remove Alyssa Rosenzweig 2025-09-18 21:17:31 +02:00
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.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
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MAINTAINERS i2c-for-6.17-rc8 2025-09-28 13:19:23 -07:00
Makefile
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 reStructuredText 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.