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selftests/mm: add more mseal traversal tests

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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>
This commit is contained in:
Pedro Falcato 2024-08-17 01:18:34 +01:00 committed by Andrew Morton
parent 5b3db2b812
commit f28bdd1b17
1 changed files with 105 additions and 1 deletions
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106
tools/testing/selftests/mm/mseal_test.c
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@ -777,6 +777,42 @@ 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, page_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;
@ -994,6 +1030,36 @@ 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;
setup_single_address(size, &ptr);
FAIL_TEST_IF_FALSE(ptr != (void *)-1);
if (seal) {
ret = sys_mseal(ptr + page_size, page_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;
@ -1746,6 +1812,37 @@ 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;
@ -1790,7 +1887,7 @@ 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();
@ -1836,12 +1933,17 @@ 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);
@ -1873,6 +1975,8 @@ 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);