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From: Sandipan Das <sandipan@linux.ibm.com>
To: shuah@kernel.org, skhan@linuxfoundation.org,
	linux-kselftest@vger.kernel.org
Cc: linux-arch@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
	x86@kernel.org, linux-mm@kvack.org, fweimer@redhat.com,
	dave.hansen@intel.com, linuxram@us.ibm.com, mhocko@kernel.org,
	mingo@redhat.com, aneesh.kumar@linux.ibm.com,
	bauerman@linux.ibm.com, msuchanek@suse.de, mpe@ellerman.id.au
Subject: [PATCH v18 19/24] selftests/vm/pkeys: Detect write violation on a mapped access-denied-key page
Date: Thu, 30 Jan 2020 12:07:01 +0530	[thread overview]
Message-ID: <97a1f35cb594830d1046e4440d95e0f7c45795d2.1580365432.git.sandipan@linux.ibm.com> (raw)
In-Reply-To: <cover.1580365432.git.sandipan@linux.ibm.com>
In-Reply-To: <cover.1580365432.git.sandipan@linux.ibm.com>

From: Ram Pai <linuxram@us.ibm.com>

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

cc: Dave Hansen <dave.hansen@intel.com>
cc: Florian Weimer <fweimer@redhat.com>
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Acked-by: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
---
 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 cb31a5cdf6d9..8bb4de103874 100644
--- a/tools/testing/selftests/vm/protection_keys.c
+++ b/tools/testing/selftests/vm/protection_keys.c
@@ -1027,6 +1027,18 @@ 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;
@@ -1423,6 +1435,7 @@ 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


  parent reply	other threads:[~2020-01-30  6:38 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-30  6:36 [PATCH v18 00/24] selftests, powerpc, x86: Memory Protection Keys Sandipan Das
2020-01-30  6:36 ` [PATCH v18 01/24] selftests/x86/pkeys: Move selftests to arch-neutral directory Sandipan Das
2020-01-30  6:36 ` [PATCH v18 02/24] selftests/vm/pkeys: Rename all references to pkru to a generic name Sandipan Das
2020-01-30  6:36 ` [PATCH v18 03/24] selftests/vm/pkeys: Move generic definitions to header file Sandipan Das
2020-01-30  6:36 ` [PATCH v18 04/24] selftests/vm/pkeys: Move some definitions to arch-specific header Sandipan Das
2020-01-30  6:36 ` [PATCH v18 05/24] selftests/vm/pkeys: Make gcc check arguments of sigsafe_printf() Sandipan Das
2020-01-30  6:36 ` [PATCH v18 06/24] selftests: vm: pkeys: Use sane types for pkey register Sandipan Das
2020-01-30  6:36 ` [PATCH v18 07/24] selftests: vm: pkeys: Add helpers for pkey bits Sandipan Das
2020-01-30  6:36 ` [PATCH v18 08/24] selftests/vm/pkeys: Fix pkey_disable_clear() Sandipan Das
2020-01-30  6:36 ` [PATCH v18 09/24] selftests/vm/pkeys: Fix assertion in pkey_disable_set/clear() Sandipan Das
2020-01-30  6:36 ` [PATCH v18 10/24] selftests/vm/pkeys: Fix alloc_random_pkey() to make it really random Sandipan Das
2020-01-30  6:36 ` [PATCH v18 11/24] selftests: vm: pkeys: Use the correct huge page size Sandipan Das
2020-01-30  6:36 ` [PATCH v18 12/24] selftests/vm/pkeys: Introduce generic pkey abstractions Sandipan Das
2020-01-30  6:36 ` [PATCH v18 13/24] selftests/vm/pkeys: Introduce powerpc support Sandipan Das
2020-01-30  6:36 ` [PATCH v18 14/24] selftests/vm/pkeys: Fix number of reserved powerpc pkeys Sandipan Das
2020-01-30  6:36 ` [PATCH v18 15/24] selftests/vm/pkeys: Fix assertion in test_pkey_alloc_exhaust() Sandipan Das
2020-01-30  6:36 ` [PATCH v18 16/24] selftests/vm/pkeys: Improve checks to determine pkey support Sandipan Das
2020-01-30  6:36 ` [PATCH v18 17/24] selftests/vm/pkeys: Associate key on a mapped page and detect access violation Sandipan Das
2020-01-30  6:37 ` [PATCH v18 18/24] selftests/vm/pkeys: Associate key on a mapped page and detect write violation Sandipan Das
2020-01-30  6:37 ` Sandipan Das [this message]
2020-01-30  6:37 ` [PATCH v18 20/24] selftests/vm/pkeys: Introduce a sub-page allocator Sandipan Das
2020-01-30  6:37 ` [PATCH v18 21/24] selftests/vm/pkeys: Test correct behaviour of pkey-0 Sandipan Das
2020-01-30  6:37 ` [PATCH v18 22/24] selftests/vm/pkeys: Override access right definitions on powerpc Sandipan Das
2020-01-30  6:37 ` [PATCH v18 23/24] selftests: vm: pkeys: Use the correct page size " Sandipan Das
2020-01-30  6:37 ` [PATCH v18 24/24] selftests: vm: pkeys: Fix multilib builds for x86 Sandipan Das
2020-01-30 21:51 ` [PATCH v18 00/24] selftests, powerpc, x86: Memory Protection Keys Dave Hansen
2020-03-02 10:25   ` Sandipan Das

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