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Date: Tue, 16 Nov 2021 15:10:28 +0100 From: Andrey Konovalov <andreyknvl@...il.com> To: Kees Cook <keescook@...omium.org> Cc: Marco Elver <elver@...gle.com>, Andrey Ryabinin <ryabinin.a.a@...il.com>, Alexander Potapenko <glider@...gle.com>, Dmitry Vyukov <dvyukov@...gle.com>, kasan-dev <kasan-dev@...glegroups.com>, Andrew Morton <akpm@...ux-foundation.org>, LKML <linux-kernel@...r.kernel.org>, linux-hardening@...r.kernel.org Subject: Re: [PATCH] kasan: test: Silence intentional read overflow warnings On Tue, Nov 16, 2021 at 1:41 AM Kees Cook <keescook@...omium.org> wrote: > > As done in commit d73dad4eb5ad ("kasan: test: bypass __alloc_size checks") > for __write_overflow warnings, also silence some more cases that trip > the __read_overflow warnings seen in 5.16-rc1[1]: > > In file included from /kisskb/src/include/linux/string.h:253, > from /kisskb/src/include/linux/bitmap.h:10, > from /kisskb/src/include/linux/cpumask.h:12, > from /kisskb/src/include/linux/mm_types_task.h:14, > from /kisskb/src/include/linux/mm_types.h:5, > from /kisskb/src/include/linux/page-flags.h:13, > from /kisskb/src/arch/arm64/include/asm/mte.h:14, > from /kisskb/src/arch/arm64/include/asm/pgtable.h:12, > from /kisskb/src/include/linux/pgtable.h:6, > from /kisskb/src/include/linux/kasan.h:29, > from /kisskb/src/lib/test_kasan.c:10: > In function 'memcmp', > inlined from 'kasan_memcmp' at /kisskb/src/lib/test_kasan.c:897:2: > /kisskb/src/include/linux/fortify-string.h:263:25: error: call to '__read_overflow' declared with attribute error: detected read beyond size of object (1st parameter) > 263 | __read_overflow(); > | ^~~~~~~~~~~~~~~~~ > In function 'memchr', > inlined from 'kasan_memchr' at /kisskb/src/lib/test_kasan.c:872:2: > /kisskb/src/include/linux/fortify-string.h:277:17: error: call to '__read_overflow' declared with attribute error: detected read beyond size of object (1st parameter) > 277 | __read_overflow(); > | ^~~~~~~~~~~~~~~~~ > > [1] http://kisskb.ellerman.id.au/kisskb/buildresult/14660585/log/ > > Cc: Marco Elver <elver@...gle.com> > Cc: Andrey Ryabinin <ryabinin.a.a@...il.com> > Cc: Alexander Potapenko <glider@...gle.com> > Cc: Andrey Konovalov <andreyknvl@...il.com> > Cc: Dmitry Vyukov <dvyukov@...gle.com> > Cc: kasan-dev@...glegroups.com > Fixes: d73dad4eb5ad ("kasan: test: bypass __alloc_size checks") > Signed-off-by: Kees Cook <keescook@...omium.org> > --- > lib/test_kasan.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/lib/test_kasan.c b/lib/test_kasan.c > index 67ed689a0b1b..0643573f8686 100644 > --- a/lib/test_kasan.c > +++ b/lib/test_kasan.c > @@ -869,6 +869,7 @@ static void kasan_memchr(struct kunit *test) > ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); > KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); > > + OPTIMIZER_HIDE_VAR(size); > KUNIT_EXPECT_KASAN_FAIL(test, > kasan_ptr_result = memchr(ptr, '1', size + 1)); > > @@ -894,6 +895,7 @@ static void kasan_memcmp(struct kunit *test) > KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); > memset(arr, 0, sizeof(arr)); > > + OPTIMIZER_HIDE_VAR(size); > KUNIT_EXPECT_KASAN_FAIL(test, > kasan_int_result = memcmp(ptr, arr, size+1)); > kfree(ptr); > -- > 2.30.2 > Reviewed-by: Andrey Konovalov <andreyknvl@...il.com> Thanks!
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