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selftests/vm/pkeys: detect write violation on a mapped access-denied-key page

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Detect write-violation on a page to which access-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/6a7dd4069ee18a2a51b207a55aa197f3f3c59753.1585646528.git.sandipan@linux.ibm.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ram Pai 2020-06-04 16:52:36 -07:00 committed by Linus Torvalds
parent 39351c1326
commit 4e06e718af
1 changed files with 13 additions and 0 deletions
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13
tools/testing/selftests/vm/protection_keys.c
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@ -1027,6 +1027,18 @@ void test_write_of_access_disabled_region(int *ptr, u16 pkey)
*ptr = __LINE__; *ptr = __LINE__;
expected_pkey_fault(pkey); 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) void test_kernel_write_of_access_disabled_region(int *ptr, u16 pkey)
{ {
int ret; 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,
test_write_of_write_disabled_region_with_page_already_mapped, test_write_of_write_disabled_region_with_page_already_mapped,
test_write_of_access_disabled_region, 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_access_disabled_region,
test_kernel_write_of_write_disabled_region, test_kernel_write_of_write_disabled_region,
test_kernel_gup_of_access_disabled_region, test_kernel_gup_of_access_disabled_region,