[PATCH v16 19/23] selftests/vm/pkeys: Detect write violation on a mapped access-denied-key page
From: Sandipan Das <hidden>
Date: 2020-01-17 12:51:25
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 access-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 | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c
index babe3f6310f2..38ac3211d214 100644
--- a/tools/testing/selftests/vm/protection_keys.c
+++ b/tools/testing/selftests/vm/protection_keys.c@@ -1026,6 +1026,18 @@ void test_write_of_access_disabled_region(int *ptr, u16 pkey) *ptr = __LINE__; expected_pkey_fault(pkey); } + +void test_write_of_access_disabled_region_with_page_already_mapped(int *ptr, + u16 pkey) +{ + *ptr = __LINE__; + dprintf1("disabling access; after accessing the page, " + " to PKEY[%02d], doing write\n", pkey); + pkey_access_deny(pkey); + *ptr = __LINE__; + expected_pkey_fault(pkey); +} + void test_kernel_write_of_access_disabled_region(int *ptr, u16 pkey) { int ret;
@@ -1422,6 +1434,7 @@ void (*pkey_tests[])(int *ptr, u16 pkey) = { test_write_of_write_disabled_region, test_write_of_write_disabled_region_with_page_already_mapped, test_write_of_access_disabled_region, + test_write_of_access_disabled_region_with_page_already_mapped, test_kernel_write_of_access_disabled_region, test_kernel_write_of_write_disabled_region, test_kernel_gup_of_access_disabled_region,
--
2.17.1