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Subject[PATCH v2 00/34] kasan, vmalloc, arm64: add vmalloc tagging support for SW/HW_TAGS
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From: Andrey Konovalov <andreyknvl@google.com>

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-v2

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.

I'll keep the patchset based on the mainline for now. Once the
high-level issues are resolved, I'll rebase onto mm - there might be
a few conflicts right now.

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 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 (34):
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: don't tag stacks allocated with vmalloc
kasan, vmalloc: add vmalloc support to 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 support to HW_TAGS
kasan: mark kasan_arg_stacktrace as __initdata
kasan: simplify kasan_init_hw_tags
kasan: add kasan.vmalloc command line flag
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/kernel/module.c | 2 +-
arch/s390/kernel/module.c | 2 +-
arch/x86/kernel/module.c | 2 +-
include/linux/gfp.h | 28 +++--
include/linux/kasan.h | 91 +++++++++------
include/linux/vmalloc.h | 18 ++-
kernel/fork.c | 1 +
lib/Kconfig.kasan | 20 ++--
lib/test_kasan.c | 181 +++++++++++++++++++++++++++++-
mm/kasan/common.c | 4 +-
mm/kasan/hw_tags.c | 157 +++++++++++++++++++++-----
mm/kasan/kasan.h | 16 ++-
mm/kasan/shadow.c | 57 ++++++----
mm/page_alloc.c | 150 +++++++++++++++++--------
mm/vmalloc.c | 72 ++++++++++--
18 files changed, 631 insertions(+), 199 deletions(-)

--
2.25.1

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