linux-hardening - Re: [PATCH v2 2/4] selftests/mm: mseal

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Message-ID: <CABi2SkUESzc6yjf5TbfZM7gHDcx4wXC5R8+xtqgYZAmY1fm64A@mail.gmail.com>
Date: Fri, 30 Aug 2024 08:46:41 -0700
From: Jeff Xu <jeffxu@...omium.org>
To: Pedro Falcato <pedro.falcato@...il.com>
Cc: akpm@...ux-foundation.org, linux-kselftest@...r.kernel.org, 
	linux-mm@...ck.org, linux-hardening@...r.kernel.org, 
	linux-kernel@...r.kernel.org, willy@...radead.org, lorenzo.stoakes@...cle.com, 
	broonie@...nel.org, vbabka@...e.cz, Liam.Howlett@...cle.com, 
	rientjes@...gle.com, keescook@...omium.org
Subject: Re: [PATCH v2 2/4] selftests/mm: mseal_test add sealed madvise type

On Fri, Aug 30, 2024 at 5:52 AM Pedro Falcato <pedro.falcato@...il.com> wrote:
>
> On Thu, Aug 29, 2024 at 09:43:50PM GMT, jeffxu@...omium.org wrote:
> > From: Jeff Xu <jeffxu@...omium.org>
> >
> > Add a testcase to cover all sealed madvise type.
> >
> > Signed-off-by: Jeff Xu <jeffxu@...omium.org>
> > ---
> >  tools/testing/selftests/mm/mseal_test.c | 108 +++++++++++++++++++++++-
> >  1 file changed, 107 insertions(+), 1 deletion(-)
> >
> > diff --git a/tools/testing/selftests/mm/mseal_test.c b/tools/testing/selftests/mm/mseal_test.c
> > index adc646cf576c..ae06c354220d 100644
> > --- a/tools/testing/selftests/mm/mseal_test.c
> > +++ b/tools/testing/selftests/mm/mseal_test.c
> > @@ -2121,6 +2121,107 @@ static void test_seal_madvise_nodiscard(bool seal)
> >       REPORT_TEST_PASS();
> >  }
> >
> > +static void test_seal_discard_madvise_advice(void)
> > +{
> > +     void *ptr;
> > +     unsigned long page_size = getpagesize();
> > +     unsigned long size = 4 * page_size;
> > +     int ret;
> > +     int sealed_advice[] = {MADV_FREE, MADV_DONTNEED,
> > +             MADV_DONTNEED_LOCKED, MADV_REMOVE,
> > +             MADV_DONTFORK, MADV_WIPEONFORK};
> > +     int size_sealed_advice = sizeof(sealed_advice) / sizeof(int);
> > +
> > +     setup_single_address(size, &ptr);
> > +     FAIL_TEST_IF_FALSE(ptr != (void *)-1);
> > +
> > +     ret = seal_single_address(ptr, size);
> > +     FAIL_TEST_IF_FALSE(!ret);
> > +
> > +     for (int i = 0; i < size_sealed_advice; i++) {
> > +             ret = sys_madvise(ptr, size, sealed_advice[i]);
> > +             FAIL_TEST_IF_FALSE(ret < 0);
> > +             FAIL_TEST_IF_FALSE(errno == EPERM);
> > +     }
> > +
> > +     REPORT_TEST_PASS();
> > +}
>
> This can replace some of the other 9 discard tests already there, no?
>
No, this  is focused on enumerating all types.

> > +
> > +static void test_munmap_free_multiple_ranges(bool seal)
> > +{
> > +     void *ptr;
> > +     unsigned long page_size = getpagesize();
> > +     unsigned long size = 8 * page_size;
> > +     int ret;
> > +     int prot;
> > +
> > +     setup_single_address(size, &ptr);
> > +     FAIL_TEST_IF_FALSE(ptr != (void *)-1);
> > +
> > +     /* unmap one page from beginning. */
> > +     ret = sys_munmap(ptr, page_size);
> > +     FAIL_TEST_IF_FALSE(!ret);
> > +
> > +     /* unmap one page from middle. */
> > +     ret = sys_munmap(ptr + 4 * page_size, page_size);
> > +     FAIL_TEST_IF_FALSE(!ret);
> > +
> > +     size = get_vma_size(ptr + page_size, &prot);
> > +     FAIL_TEST_IF_FALSE(size == 3 * page_size);
> > +     FAIL_TEST_IF_FALSE(prot == 4);
> > +
> > +     size = get_vma_size(ptr +  5 * page_size, &prot);
> > +     FAIL_TEST_IF_FALSE(size == 3 * page_size);
> > +     FAIL_TEST_IF_FALSE(prot == 4);
> > +
> > +
> > +     /* seal the last page */
> > +     if (seal) {
> > +             ret = sys_mseal(ptr + 7 * page_size, page_size);
> > +             FAIL_TEST_IF_FALSE(!ret);
> > +
> > +             size = get_vma_size(ptr +  1 * page_size, &prot);
> > +             FAIL_TEST_IF_FALSE(size == 3 * page_size);
> > +             FAIL_TEST_IF_FALSE(prot == 4);
> > +
> > +             size = get_vma_size(ptr +  5 * page_size, &prot);
> > +             FAIL_TEST_IF_FALSE(size == 2 * page_size);
> > +             FAIL_TEST_IF_FALSE(prot == 4);
> > +
> > +             size = get_vma_size(ptr +  7 * page_size, &prot);
> > +             FAIL_TEST_IF_FALSE(size == 1 * page_size);
> > +             FAIL_TEST_IF_FALSE(prot == 4);
> > +     }
> > +
> > +     /* munmap all 8  pages from beginning */
> > +     ret = sys_munmap(ptr, 8 * page_size);
> > +     if (seal) {
> > +             FAIL_TEST_IF_FALSE(ret);
> > +
> > +             /* verify mapping are not changed */
> > +             size = get_vma_size(ptr + 1 * page_size, &prot);
> > +             FAIL_TEST_IF_FALSE(size == 3 * page_size);
> > +             FAIL_TEST_IF_FALSE(prot == 4);
> > +
> > +             size = get_vma_size(ptr +  5 * page_size, &prot);
> > +             FAIL_TEST_IF_FALSE(size == 2 * page_size);
> > +             FAIL_TEST_IF_FALSE(prot == 4);
> > +
> > +             size = get_vma_size(ptr +  7 * page_size, &prot);
> > +             FAIL_TEST_IF_FALSE(size == 1 * page_size);
> > +             FAIL_TEST_IF_FALSE(prot == 4);
> > +     } else {
> > +             FAIL_TEST_IF_FALSE(!ret);
> > +
> > +             for (int i = 0; i < 8; i++) {
> > +                     size = get_vma_size(ptr, &prot);
> > +                     FAIL_TEST_IF_FALSE(size == 0);
> > +             }
> > +     }
> > +
> > +     REPORT_TEST_PASS();
> > +}
>
> Unrelated munmap change.
will move.

>
> --
> Pedro