selftests/mm: add more mseal traversal tests
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. [akpm@linux-foundation.org: remove incorrect comment, per review] [akpm@linux-foundation.org: remove the correct comment, per Pedro] [pedro.falcato@gmail.com: fix mseal's length] Link: https://lkml.kernel.org/r/vc4czyuemmu3kylqb4ctaga6y5yvondlyabimx6jvljlw2fkea@djawlllf45xa Link: https://lkml.kernel.org/r/20240817-mseal-depessimize-v3-7-d8d2e037df30@gmail.com Signed-off-by: Pedro Falcato <pedro.falcato@gmail.com> Reviewed-by: Liam R. Howlett <Liam.Howlett@Oracle.com> Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Jeff Xu <jeffxu@chromium.org> Cc: Kees Cook <kees@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Shuah Khan <shuah@kernel.org> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -777,6 +777,42 @@ static void test_seal_mprotect_partial_mprotect(bool seal)
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REPORT_TEST_PASS();
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}
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static void test_seal_mprotect_partial_mprotect_tail(bool seal)
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{
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void *ptr;
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unsigned long page_size = getpagesize();
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unsigned long size = 2 * page_size;
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int ret;
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int prot;
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/*
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* Check if a partial mseal (that results in two vmas) works correctly.
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* It might mprotect the first, but it'll never touch the second (msealed) vma.
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*/
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setup_single_address(size, &ptr);
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FAIL_TEST_IF_FALSE(ptr != (void *)-1);
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if (seal) {
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ret = sys_mseal(ptr + page_size, page_size);
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FAIL_TEST_IF_FALSE(!ret);
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}
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ret = sys_mprotect(ptr, size, PROT_EXEC);
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if (seal)
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FAIL_TEST_IF_FALSE(ret < 0);
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else
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FAIL_TEST_IF_FALSE(!ret);
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if (seal) {
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FAIL_TEST_IF_FALSE(get_vma_size(ptr + page_size, &prot) > 0);
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FAIL_TEST_IF_FALSE(prot == 0x4);
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}
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REPORT_TEST_PASS();
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}
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static void test_seal_mprotect_two_vma_with_gap(bool seal)
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{
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void *ptr;
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@ -994,6 +1030,36 @@ static void test_seal_munmap_vma_with_gap(bool seal)
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REPORT_TEST_PASS();
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}
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static void test_seal_munmap_partial_across_vmas(bool seal)
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{
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void *ptr;
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unsigned long page_size = getpagesize();
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unsigned long size = 2 * page_size;
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int ret;
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int prot;
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setup_single_address(size, &ptr);
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FAIL_TEST_IF_FALSE(ptr != (void *)-1);
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if (seal) {
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ret = sys_mseal(ptr + page_size, page_size);
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FAIL_TEST_IF_FALSE(!ret);
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}
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ret = sys_munmap(ptr, size);
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if (seal)
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FAIL_TEST_IF_FALSE(ret < 0);
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else
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FAIL_TEST_IF_FALSE(!ret);
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if (seal) {
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FAIL_TEST_IF_FALSE(get_vma_size(ptr + page_size, &prot) > 0);
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FAIL_TEST_IF_FALSE(prot == 0x4);
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}
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REPORT_TEST_PASS();
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}
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static void test_munmap_start_freed(bool seal)
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{
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void *ptr;
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@ -1746,6 +1812,37 @@ static void test_seal_discard_ro_anon(bool seal)
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REPORT_TEST_PASS();
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}
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static void test_seal_discard_across_vmas(bool seal)
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{
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void *ptr;
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unsigned long page_size = getpagesize();
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unsigned long size = 2 * page_size;
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int ret;
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setup_single_address(size, &ptr);
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FAIL_TEST_IF_FALSE(ptr != (void *)-1);
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if (seal) {
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ret = seal_single_address(ptr + page_size, page_size);
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FAIL_TEST_IF_FALSE(!ret);
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}
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ret = sys_madvise(ptr, size, MADV_DONTNEED);
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if (seal)
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FAIL_TEST_IF_FALSE(ret < 0);
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else
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FAIL_TEST_IF_FALSE(!ret);
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ret = sys_munmap(ptr, size);
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if (seal)
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FAIL_TEST_IF_FALSE(ret < 0);
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else
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FAIL_TEST_IF_FALSE(!ret);
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REPORT_TEST_PASS();
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}
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static void test_seal_madvise_nodiscard(bool seal)
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{
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void *ptr;
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@ -1790,7 +1887,7 @@ int main(int argc, char **argv)
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if (!pkey_supported())
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ksft_print_msg("PKEY not supported\n");
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ksft_set_plan(82);
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ksft_set_plan(88);
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test_seal_addseal();
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test_seal_unmapped_start();
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@ -1836,12 +1933,17 @@ int main(int argc, char **argv)
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test_seal_mprotect_split(false);
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test_seal_mprotect_split(true);
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test_seal_mprotect_partial_mprotect_tail(false);
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test_seal_mprotect_partial_mprotect_tail(true);
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test_seal_munmap(false);
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test_seal_munmap(true);
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test_seal_munmap_two_vma(false);
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test_seal_munmap_two_vma(true);
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test_seal_munmap_vma_with_gap(false);
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test_seal_munmap_vma_with_gap(true);
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test_seal_munmap_partial_across_vmas(false);
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test_seal_munmap_partial_across_vmas(true);
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test_munmap_start_freed(false);
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test_munmap_start_freed(true);
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@ -1873,6 +1975,8 @@ int main(int argc, char **argv)
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test_seal_madvise_nodiscard(true);
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test_seal_discard_ro_anon(false);
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test_seal_discard_ro_anon(true);
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test_seal_discard_across_vmas(false);
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test_seal_discard_across_vmas(true);
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test_seal_discard_ro_anon_on_rw(false);
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test_seal_discard_ro_anon_on_rw(true);
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test_seal_discard_ro_anon_on_shared(false);
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