[PATCH v2 1/1] kasan: Add memzero init for unaligned size under SLUB debug
From: <hidden>
Date: 2021-06-23 13:35:48
Also in:
linux-mediatek, linux-mm, lkml
Subsystem:
kasan, memory management, the rest · Maintainers:
Andrey Ryabinin, Andrew Morton, Linus Torvalds
From: Yee Lee <redacted> Issue: when SLUB debug is on, hwtag kasan_unpoison() would overwrite the redzone with unaligned object size. An additional memzero_explicit() path is added to replacing hwtag initialization at SLUB deubg mode. Signed-off-by: Yee Lee <redacted> Suggested-by: Marco Elver <elver@google.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Konovalov <andreyknvl@gmail.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Andrew Morton <akpm@linux-foundation.org> --- mm/kasan/kasan.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index d8faa64614b7..e984a9ac814d 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h@@ -387,10 +387,12 @@ static inline void kasan_unpoison(const void *addr, size_t size, bool init) if (WARN_ON((unsigned long)addr & KASAN_GRANULE_MASK)) return; + #if IS_ENABLED(CONFIG_SLUB_DEBUG) if (init && ((unsigned long)size & KASAN_GRANULE_MASK)) { init = false; - memset((void *)addr, 0, size); + memzero_explicit((void *)addr, size); } + #endif size = round_up(size, KASAN_GRANULE_SIZE); hw_set_mem_tag_range((void *)addr, size, tag, init); }
--
2.18.0
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