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charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Sat, Jan 9, 2021 at 11:33 AM Lecopzer Chen wrote: > > Linux supports KAsan for VMALLOC since commit 3c5c3cfb9ef4da9 > ("kasan: support backing vmalloc space with real shadow memory") > > Acroding to how x86 ported it [1], they early allocated p4d and pgd, > but in arm64 I just simulate how KAsan supports MODULES_VADDR in arm64 > by not to populate the vmalloc area except for kimg address. > > Test environment: > 4G and 8G Qemu virt, > 39-bit VA + 4k PAGE_SIZE with 3-level page table, > test by lib/test_kasan.ko and lib/test_kasan_module.ko > > It also works in Kaslr with CONFIG_RANDOMIZE_MODULE_REGION_FULL > and randomize module region inside vmalloc area. > > > [1]: commit 0609ae011deb41c ("x86/kasan: support KASAN_VMALLOC") > > Signed-off-by: Lecopzer Chen > Acked-by: Andrey Konovalov > Tested-by: Andrey Konovalov > > > v2 -> v1 > 1. kasan_init.c tweak indent > 2. change Kconfig depends only on HAVE_ARCH_KASAN > 3. support randomized module region. > > v1: > https://lore.kernel.org/lkml/20210103171137.153834-1-lecopzer@gmail.com/ > > Lecopzer Chen (4): > arm64: kasan: don't populate vmalloc area for CONFIG_KASAN_VMALLOC > arm64: kasan: abstract _text and _end to KERNEL_START/END > arm64: Kconfig: support CONFIG_KASAN_VMALLOC > arm64: kaslr: support randomized module area with KASAN_VMALLOC > > arch/arm64/Kconfig | 1 + > arch/arm64/kernel/kaslr.c | 18 ++++++++++-------- > arch/arm64/kernel/module.c | 16 +++++++++------- > arch/arm64/mm/kasan_init.c | 29 +++++++++++++++++++++-------- > 4 files changed, 41 insertions(+), 23 deletions(-) > > -- > 2.25.1 > Hi Will, Could you PTAL at the arm64 changes? Thanks!