Hi Andrew, Thanks for your help to add this patch. Unforunately, we need a little change on codes based on Andrey and Marco's suggestion. Please drop this one, and I will send a new version soon. Appreaciated the work! Best regards, Yee On Thu, 2021-06-24 at 13:54 -0700, akpm@xxxxxxxxxxxxxxxxxxxx wrote: > The patch titled > Subject: kasan: add memzero init for unaligned size under SLUB > debug > has been added to the -mm tree. Its filename is > kasan-add-memzero-init-for-unaligned-size-under-slub-debug.patch > > This patch should soon appear at > > https://ozlabs.org/~akpm/mmots/broken-out/kasan-add-memzero-init-for-unaligned-size-under-slub-debug.patch > and later at > > https://ozlabs.org/~akpm/mmotm/broken-out/kasan-add-memzero-init-for-unaligned-size-under-slub-debug.patch > > Before you just go and hit "reply", please: > a) Consider who else should be cc'ed > b) Prefer to cc a suitable mailing list as well > c) Ideally: find the original patch on the mailing list and do a > reply-to-all to that, adding suitable additional cc's > > *** Remember to use Documentation/process/submit-checklist.rst when > testing your code *** > > The -mm tree is included into linux-next and is updated > there every 3-4 working days > > ------------------------------------------------------ > From: Yee Lee <yee.lee@xxxxxxxxxxxx> > Subject: kasan: add memzero init for unaligned size under SLUB debug > > Issue: when SLUB debug is on, hwtag kasan_unpoison() would overwrite > the > redzone of object with unaligned size. > > An additional memzero_explicit() path is added to replacing init by > hwtag > instruction for those unaligned size at SLUB debug mode. > > Link: > https://lkml.kernel.org/r/20210624112624.31215-2-yee.lee@xxxxxxxxxxxx > Signed-off-by: Yee Lee <yee.lee@xxxxxxxxxxxx> > Cc: Andrey Konovalov <andreyknvl@xxxxxxxxx> > Cc: Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx> > Cc: Alexander Potapenko <glider@xxxxxxxxxx> > Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx> > Cc: Matthias Brugger <matthias.bgg@xxxxxxxxx> > Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > --- > > mm/kasan/kasan.h | 6 ++++++ > 1 file changed, 6 insertions(+) > > --- a/mm/kasan/kasan.h~kasan-add-memzero-init-for-unaligned-size- > under-slub-debug > +++ a/mm/kasan/kasan.h > @@ -387,6 +387,12 @@ static inline void kasan_unpoison(const > > 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; > + memzero_explicit((void *)addr, size); > + } > +#endif > size = round_up(size, KASAN_GRANULE_SIZE); > > hw_set_mem_tag_range((void *)addr, size, tag, init); > _ > > Patches currently in -mm which might be from yee.lee@xxxxxxxxxxxx are > > kasan-add-memzero-init-for-unaligned-size-under-slub-debug.patch >
