From: Andrey Konovalov <andreyknvl@xxxxxxxxxx> Hi, This patchset adds vmalloc tagging support for SW_TAGS and HW_TAGS KASAN modes. The tree with patches is available here: https://github.com/xairy/linux/tree/up-kasan-vmalloc-tags-v3-akpm About half of patches are cleanups I went for along the way. None of them seem to be important enough to go through stable, so I decided not to split them out into separate patches/series. The patchset is partially based on an early version of the HW_TAGS patchset by Vincenzo that had vmalloc support. Thus, I added a Co-developed-by tag into a few patches. SW_TAGS vmalloc tagging support is straightforward. It reuses all of the generic KASAN machinery, but uses shadow memory to store tags instead of magic values. Naturally, vmalloc tagging requires adding a few kasan_reset_tag() annotations to the vmalloc code. HW_TAGS vmalloc tagging support stands out. HW_TAGS KASAN is based on Arm MTE, which can only assigns tags to physical memory. As a result, HW_TAGS KASAN only tags vmalloc() allocations, which are backed by page_alloc memory. It ignores vmap() and others. Changes in v2->v3: - Rebase onto mm. - New patch: "kasan, arm64: reset pointer tags of vmapped stacks". - New patch: "kasan, vmalloc: don't tag executable vmalloc allocations". - New patch: "kasan, arm64: don't tag executable vmalloc allocations". - Allowing enabling KASAN_VMALLOC with SW/HW_TAGS is moved to "kasan: allow enabling KASAN_VMALLOC and SW/HW_TAGS", as this can only be done once executable allocations are no longer tagged. - Minor fixes, see patches for lists of changes. Changes in v1->v2: - Move memory init for vmalloc() into vmalloc code for HW_TAGS KASAN. - Minor fixes and code reshuffling, see patches for lists of changes. Thanks! Andrey Konovalov (38): kasan, page_alloc: deduplicate should_skip_kasan_poison kasan, page_alloc: move tag_clear_highpage out of kernel_init_free_pages kasan, page_alloc: merge kasan_free_pages into free_pages_prepare kasan, page_alloc: simplify kasan_poison_pages call site kasan, page_alloc: init memory of skipped pages on free kasan: drop skip_kasan_poison variable in free_pages_prepare mm: clarify __GFP_ZEROTAGS comment kasan: only apply __GFP_ZEROTAGS when memory is zeroed kasan, page_alloc: refactor init checks in post_alloc_hook kasan, page_alloc: merge kasan_alloc_pages into post_alloc_hook kasan, page_alloc: combine tag_clear_highpage calls in post_alloc_hook kasan, page_alloc: move SetPageSkipKASanPoison in post_alloc_hook kasan, page_alloc: move kernel_init_free_pages in post_alloc_hook kasan, page_alloc: simplify kasan_unpoison_pages call site kasan: clean up metadata byte definitions kasan: define KASAN_VMALLOC_INVALID for SW_TAGS kasan, x86, arm64, s390: rename functions for modules shadow kasan, vmalloc: drop outdated VM_KASAN comment kasan: reorder vmalloc hooks kasan: add wrappers for vmalloc hooks kasan, vmalloc: reset tags in vmalloc functions kasan, fork: reset pointer tags of vmapped stacks kasan, arm64: reset pointer tags of vmapped stacks kasan, vmalloc: add vmalloc tagging for SW_TAGS kasan, vmalloc, arm64: mark vmalloc mappings as pgprot_tagged kasan, vmalloc: don't unpoison VM_ALLOC pages before mapping kasan, page_alloc: allow skipping unpoisoning for HW_TAGS kasan, page_alloc: allow skipping memory init for HW_TAGS kasan, vmalloc: add vmalloc tagging for HW_TAGS kasan, vmalloc: don't tag executable vmalloc allocations kasan, arm64: don't tag executable vmalloc allocations kasan: mark kasan_arg_stacktrace as __initdata kasan: simplify kasan_init_hw_tags kasan: add kasan.vmalloc command line flag kasan: allow enabling KASAN_VMALLOC and SW/HW_TAGS arm64: select KASAN_VMALLOC for SW/HW_TAGS modes kasan: documentation updates kasan: improve vmalloc tests Documentation/dev-tools/kasan.rst | 17 ++- arch/arm64/Kconfig | 2 +- arch/arm64/include/asm/vmalloc.h | 10 ++ arch/arm64/include/asm/vmap_stack.h | 5 +- arch/arm64/kernel/module.c | 5 +- arch/arm64/net/bpf_jit_comp.c | 3 +- arch/s390/kernel/module.c | 2 +- arch/x86/kernel/module.c | 2 +- include/linux/gfp.h | 28 +++-- include/linux/kasan.h | 97 +++++++++------ include/linux/vmalloc.h | 18 ++- kernel/fork.c | 1 + kernel/scs.c | 4 +- lib/Kconfig.kasan | 20 +-- lib/test_kasan.c | 181 +++++++++++++++++++++++++++- mm/kasan/common.c | 4 +- mm/kasan/hw_tags.c | 166 ++++++++++++++++++++----- mm/kasan/kasan.h | 16 ++- mm/kasan/shadow.c | 63 ++++++---- mm/page_alloc.c | 150 +++++++++++++++-------- mm/vmalloc.c | 78 ++++++++++-- 21 files changed, 668 insertions(+), 204 deletions(-) -- 2.25.1
