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When specifying fixed sized scratch areas, the parser only parses the
three scratch sizes and ignores the rest of the argument. This means the
argument can have any bogus trailing characters.
For example, "kho_scratch=256M,512M,512Mfoobar" results in successful
parsing:
[ 0.000000] KHO: scratch areas: lowmem: 256MiB global: 512MiB pernode: 512MiB
It is generally a good idea to parse arguments as strictly as possible.
In addition, if bogus trailing characters are allowed in the kho_scratch
argument, it is possible that some people might end up using them and
later extensions to the argument format will cause unexpected breakages.
Make sure the argument is fully consumed after all three scratch sizes are
parsed. With this change, the bogus argument
"kho_scratch=256M,512M,512Mfoobar" results in:
[ 0.000000] Malformed early option 'kho_scratch'
Link: https://lkml.kernel.org/r/20250826123817.64681-1-pratyush@kernel.org
Signed-off-by: Pratyush Yadav <pratyush@kernel.org>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Alexander Graf <graf@amazon.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Changyuan Lyu <changyuanl@google.com>
Cc: Pratyush Yadav <pratyush@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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.