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Message-ID: <b5e9b913-1a81-47bb-982e-435f04e7f7c5@lucifer.local>
Date: Wed, 21 Aug 2024 09:47:08 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Pedro Falcato <pedro.falcato@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
"Liam R. Howlett" <Liam.Howlett@...cle.com>,
Vlastimil Babka <vbabka@...e.cz>, Shuah Khan <shuah@...nel.org>,
linux-mm@...ck.org, linux-kernel@...r.kernel.org,
linux-kselftest@...r.kernel.org, jeffxu@...omium.org,
oliver.sang@...el.com, torvalds@...ux-foundation.org,
Michael Ellerman <mpe@...erman.id.au>, Kees Cook <kees@...nel.org>
Subject: Re: [PATCH v3 7/7] selftests/mm: add more mseal traversal tests
On Sat, Aug 17, 2024 at 01:18:34AM GMT, Pedro Falcato wrote:
> Add more mseal traversal tests across VMAs, where we could possibly
> screw up sealing checks. These test more across-vma traversal for
> mprotect, munmap and madvise. Particularly, we test for the case where a
> regular VMA is followed by a sealed VMA.
>
> Signed-off-by: Pedro Falcato <pedro.falcato@...il.com>
Other than the comment, LGTM.
Thanks for this series!
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
> ---
> tools/testing/selftests/mm/mseal_test.c | 111 +++++++++++++++++++++++++++++++-
> 1 file changed, 110 insertions(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/mm/mseal_test.c b/tools/testing/selftests/mm/mseal_test.c
> index 259bef4945e9..0d4d40fb0f88 100644
> --- a/tools/testing/selftests/mm/mseal_test.c
> +++ b/tools/testing/selftests/mm/mseal_test.c
> @@ -766,6 +766,42 @@ static void test_seal_mprotect_partial_mprotect(bool seal)
> REPORT_TEST_PASS();
> }
>
> +static void test_seal_mprotect_partial_mprotect_tail(bool seal)
> +{
> + void *ptr;
> + unsigned long page_size = getpagesize();
> + unsigned long size = 2 * page_size;
> + int ret;
> + int prot;
> +
> + /*
> + * Check if a partial mseal (that results in two vmas) works correctly.
> + * It might mprotect the first, but it'll never touch the second (msealed) vma.
> + */
> +
> + setup_single_address(size, &ptr);
> + FAIL_TEST_IF_FALSE(ptr != (void *)-1);
> +
> + if (seal) {
> + ret = sys_mseal(ptr + page_size, size);
> + FAIL_TEST_IF_FALSE(!ret);
> + }
> +
> + ret = sys_mprotect(ptr, size, PROT_EXEC);
> + if (seal)
> + FAIL_TEST_IF_FALSE(ret < 0);
> + else
> + FAIL_TEST_IF_FALSE(!ret);
> +
> + if (seal) {
> + FAIL_TEST_IF_FALSE(get_vma_size(ptr + page_size, &prot) > 0);
> + FAIL_TEST_IF_FALSE(prot == 0x4);
> + }
> +
> + REPORT_TEST_PASS();
> +}
> +
> +
> static void test_seal_mprotect_two_vma_with_gap(bool seal)
> {
> void *ptr;
> @@ -983,6 +1019,41 @@ static void test_seal_munmap_vma_with_gap(bool seal)
> REPORT_TEST_PASS();
> }
>
> +static void test_seal_munmap_partial_across_vmas(bool seal)
> +{
> + void *ptr;
> + unsigned long page_size = getpagesize();
> + unsigned long size = 2 * page_size;
> + int ret;
> + int prot;
> +
> + /*
> + * Check if a partial mseal (that results in two vmas) works correctly.
> + * It might unmap the first, but it'll never unmap the second (msealed) vma.
> + */
> +
> + setup_single_address(size, &ptr);
> + FAIL_TEST_IF_FALSE(ptr != (void *)-1);
> +
> + if (seal) {
> + ret = sys_mseal(ptr + page_size, size);
> + FAIL_TEST_IF_FALSE(!ret);
> + }
> +
> + ret = sys_munmap(ptr, size);
> + if (seal)
> + FAIL_TEST_IF_FALSE(ret < 0);
> + else
> + FAIL_TEST_IF_FALSE(!ret);
> +
> + if (seal) {
> + FAIL_TEST_IF_FALSE(get_vma_size(ptr + page_size, &prot) > 0);
> + FAIL_TEST_IF_FALSE(prot == 0x4);
> + }
> +
> + REPORT_TEST_PASS();
> +}
> +
> static void test_munmap_start_freed(bool seal)
> {
> void *ptr;
> @@ -1735,6 +1806,37 @@ static void test_seal_discard_ro_anon(bool seal)
> REPORT_TEST_PASS();
> }
>
> +static void test_seal_discard_across_vmas(bool seal)
> +{
> + void *ptr;
> + unsigned long page_size = getpagesize();
> + unsigned long size = 2 * page_size;
> + int ret;
> +
> + setup_single_address(size, &ptr);
> + FAIL_TEST_IF_FALSE(ptr != (void *)-1);
> +
> + if (seal) {
> + ret = seal_single_address(ptr + page_size, page_size);
> + FAIL_TEST_IF_FALSE(!ret);
> + }
> +
> + ret = sys_madvise(ptr, size, MADV_DONTNEED);
> + if (seal)
> + FAIL_TEST_IF_FALSE(ret < 0);
> + else
> + FAIL_TEST_IF_FALSE(!ret);
> +
> + ret = sys_munmap(ptr, size);
> + if (seal)
> + FAIL_TEST_IF_FALSE(ret < 0);
> + else
> + FAIL_TEST_IF_FALSE(!ret);
> +
> + REPORT_TEST_PASS();
> +}
> +
> +
> static void test_seal_madvise_nodiscard(bool seal)
> {
> void *ptr;
> @@ -1779,7 +1881,7 @@ int main(int argc, char **argv)
> if (!pkey_supported())
> ksft_print_msg("PKEY not supported\n");
>
> - ksft_set_plan(82);
> + ksft_set_plan(88);
>
> test_seal_addseal();
> test_seal_unmapped_start();
> @@ -1825,12 +1927,17 @@ int main(int argc, char **argv)
> test_seal_mprotect_split(false);
> test_seal_mprotect_split(true);
>
> + test_seal_mprotect_partial_mprotect_tail(false);
> + test_seal_mprotect_partial_mprotect_tail(true);
> +
> test_seal_munmap(false);
> test_seal_munmap(true);
> test_seal_munmap_two_vma(false);
> test_seal_munmap_two_vma(true);
> test_seal_munmap_vma_with_gap(false);
> test_seal_munmap_vma_with_gap(true);
> + test_seal_munmap_partial_across_vmas(false);
> + test_seal_munmap_partial_across_vmas(true);
>
> test_munmap_start_freed(false);
> test_munmap_start_freed(true);
> @@ -1862,6 +1969,8 @@ int main(int argc, char **argv)
> test_seal_madvise_nodiscard(true);
> test_seal_discard_ro_anon(false);
> test_seal_discard_ro_anon(true);
> + test_seal_discard_across_vmas(false);
> + test_seal_discard_across_vmas(true);
> test_seal_discard_ro_anon_on_rw(false);
> test_seal_discard_ro_anon_on_rw(true);
> test_seal_discard_ro_anon_on_shared(false);
>
> --
> 2.46.0
>
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