[PATCH v18 18/24] selftests/vm/pkeys: Associate key on a mapped page and detect write violation
From: Sandipan Das <hidden>
Date: 2020-01-30 06:38:11
Also in:
linux-arch, linux-kselftest, linux-mm
Subsystem:
kernel selftest framework, the rest · Maintainers:
Shuah Khan, Linus Torvalds
From: Ram Pai <redacted> Detect write-violation on a page to which write-disabled key is associated much after the page is mapped. cc: Dave Hansen <redacted> cc: Florian Weimer <redacted> Signed-off-by: Ram Pai <redacted> Acked-by: Dave Hansen <redacted> Signed-off-by: Sandipan Das <redacted> --- tools/testing/selftests/vm/protection_keys.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c
index f65d384ef6a0..cb31a5cdf6d9 100644
--- a/tools/testing/selftests/vm/protection_keys.c
+++ b/tools/testing/selftests/vm/protection_keys.c@@ -1002,6 +1002,17 @@ void test_read_of_access_disabled_region_with_page_already_mapped(int *ptr, expected_pkey_fault(pkey); } +void test_write_of_write_disabled_region_with_page_already_mapped(int *ptr, + u16 pkey) +{ + *ptr = __LINE__; + dprintf1("disabling write access; after accessing the page, " + "to PKEY[%02d], doing write\n", pkey); + pkey_write_deny(pkey); + *ptr = __LINE__; + expected_pkey_fault(pkey); +} + void test_write_of_write_disabled_region(int *ptr, u16 pkey) { dprintf1("disabling write access to PKEY[%02d], doing write\n", pkey);
@@ -1410,6 +1421,7 @@ void (*pkey_tests[])(int *ptr, u16 pkey) = { test_read_of_access_disabled_region, test_read_of_access_disabled_region_with_page_already_mapped, test_write_of_write_disabled_region, + test_write_of_write_disabled_region_with_page_already_mapped, test_write_of_access_disabled_region, test_kernel_write_of_access_disabled_region, test_kernel_write_of_write_disabled_region,
--
2.17.1