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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: |
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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.