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linux/mm/kasan
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Andrey Konovalov 6c2f761dad kasan: fix zeroing vmalloc memory with HW_TAGS 
HW_TAGS KASAN skips zeroing page_alloc allocations backing vmalloc
mappings via __GFP_SKIP_ZERO.  Instead, these pages are zeroed via
kasan_unpoison_vmalloc() by passing the KASAN_VMALLOC_INIT flag.

The problem is that __kasan_unpoison_vmalloc() does not zero pages when
either kasan_vmalloc_enabled() or is_vmalloc_or_module_addr() fail.

Thus:

1. Change __vmalloc_node_range() to only set KASAN_VMALLOC_INIT when
   __GFP_SKIP_ZERO is set.

2. Change __kasan_unpoison_vmalloc() to always zero pages when the
   KASAN_VMALLOC_INIT flag is set.

3. Add WARN_ON() asserts to check that KASAN_VMALLOC_INIT cannot be set
   in other early return paths of __kasan_unpoison_vmalloc().

Also clean up the comment in __kasan_unpoison_vmalloc.

Link: https://lkml.kernel.org/r/4bc503537efdc539ffc3f461c1b70162eea31cf6.1654798516.git.andreyknvl@google.com
Fixes: 23689e91fb ("kasan, vmalloc: add vmalloc tagging for HW_TAGS")
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2022-07-03 18:08:39 -07:00
..
common.c kasan: give better names to shadow values 2022-05-13 07:20:19 -07:00
generic.c kasan: give better names to shadow values 2022-05-13 07:20:19 -07:00
hw_tags.c kasan: fix zeroing vmalloc memory with HW_TAGS 2022-07-03 18:08:39 -07:00
init.c kasan: use MAX_PTRS_PER_* for early shadow tables 2021-06-29 10:53:53 -07:00
kasan.h kasan: give better names to shadow values 2022-05-13 07:20:19 -07:00
Makefile mm/kasan: remove unnecessary CONFIG_KASAN option 2022-03-24 19:06:48 -07:00
quarantine.c kasan: give better names to shadow values 2022-05-13 07:20:19 -07:00
report_generic.c kasan: give better names to shadow values 2022-05-13 07:20:19 -07:00
report_hw_tags.c kasan: simplify kasan_find_first_bad_addr call sites 2022-03-24 19:06:49 -07:00
report_sw_tags.c kasan: simplify kasan_find_first_bad_addr call sites 2022-03-24 19:06:49 -07:00
report_tags.c kasan: rename kasan_access_info to kasan_report_info 2022-03-24 19:06:50 -07:00
report.c mm: kasan: fix input of vmalloc_to_page() 2022-05-27 09:33:46 -07:00
shadow.c kasan, vmalloc: only tag normal vmalloc allocations 2022-03-24 19:06:48 -07:00
sw_tags.c kasan: add kasan mode messages when kasan init 2021-11-11 09:34:35 -08:00
tags.c kasan: integrate the common part of two KASAN tag-based modes 2021-06-29 10:53:53 -07:00