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    Subject[PATCH mm v4 36/39] kasan: allow enabling KASAN_VMALLOC and SW/HW_TAGS
    Date
    From: Andrey Konovalov <andreyknvl@google.com>

    Allow enabling CONFIG_KASAN_VMALLOC with SW_TAGS and HW_TAGS KASAN
    modes.

    Also adjust CONFIG_KASAN_VMALLOC description:

    - Mention HW_TAGS support.
    - Remove unneeded internal details: they have no place in Kconfig
    description and are already explained in the documentation.

    Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
    ---
    lib/Kconfig.kasan | 20 ++++++++++----------
    1 file changed, 10 insertions(+), 10 deletions(-)

    diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
    index 879757b6dd14..1f3e620188a2 100644
    --- a/lib/Kconfig.kasan
    +++ b/lib/Kconfig.kasan
    @@ -178,17 +178,17 @@ config KASAN_TAGS_IDENTIFY
    memory consumption.

    config KASAN_VMALLOC
    - bool "Back mappings in vmalloc space with real shadow memory"
    - depends on KASAN_GENERIC && HAVE_ARCH_KASAN_VMALLOC
    + bool "Check accesses to vmalloc allocations"
    + depends on HAVE_ARCH_KASAN_VMALLOC
    help
    - By default, the shadow region for vmalloc space is the read-only
    - zero page. This means that KASAN cannot detect errors involving
    - vmalloc space.
    -
    - Enabling this option will hook in to vmap/vmalloc and back those
    - mappings with real shadow memory allocated on demand. This allows
    - for KASAN to detect more sorts of errors (and to support vmapped
    - stacks), but at the cost of higher memory usage.
    + This mode makes KASAN check accesses to vmalloc allocations for
    + validity.
    +
    + With software KASAN modes, checking is done for all types of vmalloc
    + allocations. Enabling this option leads to higher memory usage.
    +
    + With hardware tag-based KASAN, only VM_ALLOC mappings are checked.
    + There is no additional memory usage.

    config KASAN_KUNIT_TEST
    tristate "KUnit-compatible tests of KASAN bug detection capabilities" if !KUNIT_ALL_TESTS
    --
    2.25.1
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