The patch titled
Subject: selftests/vm/pkeys: associate key on a mapped page and detect access violation
has been added to the -mm tree. Its filename is
selftests-vm-pkeys-associate-key-on-a-mapped-page-and-detect-access-violation.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/selftests-vm-pkeys-associate-key-on-a-mapped-page-and-detect-access-violation.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/selftests-vm-pkeys-associate-key-on-a-mapped-page-and-detect-access-violation.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Ram Pai <linuxram@xxxxxxxxxx>
Subject: selftests/vm/pkeys: associate key on a mapped page and detect access violation
Detect access-violation on a page to which access-disabled key is
associated much after the page is mapped.
Link: http://lkml.kernel.org/r/4a19cf9252c03dd883887e9002881599e6900d06.1585646528.git.sandipan@xxxxxxxxxxxxx
Signed-off-by: Ram Pai <linuxram@xxxxxxxxxx>
Acked-by: Dave Hansen <dave.hansen@xxxxxxxxx>
Signed-off: Sandipan Das <sandipan@xxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: Florian Weimer <fweimer@xxxxxxxxxx>
Cc: "Desnes A. Nunes do Rosario" <desnesn@xxxxxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Thiago Jung Bauermann <bauerman@xxxxxxxxxxxxx>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Michal Suchanek <msuchanek@xxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/vm/protection_keys.c | 19 +++++++++++++++++
1 file changed, 19 insertions(+)
--- a/tools/testing/selftests/vm/protection_keys.c~selftests-vm-pkeys-associate-key-on-a-mapped-page-and-detect-access-violation
+++ a/tools/testing/selftests/vm/protection_keys.c
@@ -984,6 +984,24 @@ void test_read_of_access_disabled_region
dprintf1("*ptr: %d\n", ptr_contents);
expected_pkey_fault(pkey);
}
+
+void test_read_of_access_disabled_region_with_page_already_mapped(int *ptr,
+ u16 pkey)
+{
+ int ptr_contents;
+
+ dprintf1("disabling access to PKEY[%02d], doing read @ %p\n",
+ pkey, ptr);
+ ptr_contents = read_ptr(ptr);
+ dprintf1("reading ptr before disabling the read : %d\n",
+ ptr_contents);
+ read_pkey_reg();
+ pkey_access_deny(pkey);
+ ptr_contents = read_ptr(ptr);
+ dprintf1("*ptr: %d\n", ptr_contents);
+ 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);
@@ -1390,6 +1408,7 @@ void test_mprotect_pkey_on_unsupported_c
void (*pkey_tests[])(int *ptr, u16 pkey) = {
test_read_of_write_disabled_region,
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_access_disabled_region,
test_kernel_write_of_access_disabled_region,
_
Patches currently in -mm which might be from linuxram@xxxxxxxxxx are
selftests-x86-pkeys-move-selftests-to-arch-neutral-directory.patch
selftests-vm-pkeys-rename-all-references-to-pkru-to-a-generic-name.patch
selftests-vm-pkeys-move-generic-definitions-to-header-file.patch
selftests-vm-pkeys-fix-pkey_disable_clear.patch
selftests-vm-pkeys-fix-assertion-in-pkey_disable_set-clear.patch
selftests-vm-pkeys-fix-alloc_random_pkey-to-make-it-really-random.patch
selftests-vm-pkeys-introduce-generic-pkey-abstractions.patch
selftests-vm-pkeys-introduce-powerpc-support.patch
selftests-vm-pkeys-fix-assertion-in-test_pkey_alloc_exhaust.patch
selftests-vm-pkeys-improve-checks-to-determine-pkey-support.patch
selftests-vm-pkeys-associate-key-on-a-mapped-page-and-detect-access-violation.patch
selftests-vm-pkeys-associate-key-on-a-mapped-page-and-detect-write-violation.patch
selftests-vm-pkeys-detect-write-violation-on-a-mapped-access-denied-key-page.patch
selftests-vm-pkeys-introduce-a-sub-page-allocator.patch
selftests-vm-pkeys-test-correct-behaviour-of-pkey-0.patch
selftests-vm-pkeys-override-access-right-definitions-on-powerpc.patch
