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e269b5d291
vm_module_tags_populate() calculation of the populated area assumes that
area starts at a page boundary and therefore when new pages are allocation,
the end of the area is page-aligned as well. If the start of the area is
not page-aligned then allocating a page and incrementing the end of the
area by PAGE_SIZE leads to an area at the end but within the area boundary
which is not populated. Accessing this are will lead to a kernel panic.
Fix the calculation by down-aligning the start of the area and using that
as the location allocated pages are mapped to.
[gehao@kylinos.cn: fix vm_module_tags_populate's KASAN poisoning logic]
Link: https://lkml.kernel.org/r/20241205170528.81000-1-hao.ge@linux.dev
[gehao@kylinos.cn: fix panic when CONFIG_KASAN enabled and CONFIG_KASAN_VMALLOC not enabled]
Link: https://lkml.kernel.org/r/20241212072126.134572-1-hao.ge@linux.dev
Link: https://lkml.kernel.org/r/20241130001423.1114965-1-surenb@google.com
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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.