3f148f3318
KASAN maps shadow for the entire CPU-entry-area: [CPU_ENTRY_AREA_BASE, CPU_ENTRY_AREA_BASE + CPU_ENTRY_AREA_MAP_SIZE] This will explode once the per-cpu entry areas are randomized since it will increase CPU_ENTRY_AREA_MAP_SIZE to 512 GB and KASAN fails to allocate shadow for such big area. Fix this by allocating KASAN shadow only for really used cpu entry area addresses mapped by cea_map_percpu_pages() Thanks to the 0day folks for finding and reporting this to be an issue. [ dhansen: tweak changelog since this will get committed before peterz's actual cpu-entry-area randomization ] Signed-off-by: Andrey Ryabinin <ryabinin.a.a@gmail.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Tested-by: Yujie Liu <yujie.liu@intel.com> Cc: kernel test robot <yujie.liu@intel.com> Link: https://lore.kernel.org/r/202210241508.2e203c3d-yujie.liu@intel.com
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 Restructured Text 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.