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Introduce CONFIG_SLAB_BUCKETS which provides the infrastructure to support separated kmalloc buckets (in the following kmem_buckets_create() patches and future codetag-based separation). Since this will provide a mitigation for a very common case of exploits, it is recommended to enable this feature for general purpose distros. By default, the new Kconfig will be enabled if CONFIG_SLAB_FREELIST_HARDENED is enabled (and it is added to the hardening.config Kconfig fragment). To be able to choose which buckets to allocate from, make the buckets available to the internal kmalloc interfaces by adding them as the second argument, rather than depending on the buckets being chosen from the fixed set of global buckets. Where the bucket is not available, pass NULL, which means "use the default system kmalloc bucket set" (the prior existing behavior), as implemented in kmalloc_slab(). To avoid adding the extra argument when !CONFIG_SLAB_BUCKETS, only the top-level macros and static inlines use the buckets argument (where they are stripped out and compiled out respectively). The actual extern functions can then be built without the argument, and the internals fall back to the global kmalloc buckets unconditionally. Co-developed-by: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Kees Cook <kees@kernel.org> Signed-off-by: Vlastimil Babka <vbabka@suse.cz> |
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| 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.