Commit 39351c13 authored Jun 04, 2020 by Ram Pai Committed by Linus Torvalds Jun 04, 2020

selftests/vm/pkeys: associate key on a mapped page and detect write violation



Detect write-violation on a page to which write-disabled key is associated
much after the page is mapped.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Dave Hansen <dave.hansen@intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: "Desnes A. Nunes do Rosario" <desnesn@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Michal Suchanek <msuchanek@suse.de>
Cc: Shuah Khan <shuah@kernel.org>
Link: http://lkml.kernel.org/r/6bfe3b3832f8bcfb07d7f2cf116b45197f4587dd.1585646528.git.sandipan@linux.ibm.com


Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent aef759db

tools/testing/selftests/vm/protection_keys.c

+12 −0

Original line number	Diff line number	Diff line
		@@ -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,

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