• Max Filippov's avatar
    xtensa: add support for KASAN · c633544a
    Max Filippov authored
    Cover kernel addresses above 0x90000000 by the shadow map. Enable
    HAVE_ARCH_KASAN when MMU is enabled. Provide kasan_early_init that fills
    shadow map with writable copies of kasan_zero_page. Call
    kasan_early_init right after mmu initialization in the setup_arch.
    Provide kasan_init that allocates proper shadow map pages from the
    memblock and puts these pages into the shadow map for addresses from
    VMALLOC area to the end of KSEG. Call kasan_init right after memblock
    initialization. Don't use KASAN for the boot code, MMU and KASAN
    initialization and page fault handler. Make kernel stack size 4 times
    larger when KASAN is enabled to avoid stack overflows.
    GCC 7.3, 8 or newer is required to build the xtensa kernel with KASAN.
    Signed-off-by: default avatarMax Filippov <jcmvbkbc@gmail.com>
    c633544a
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