Commit 39351c13 authored by Ram Pai's avatar Ram Pai Committed by Linus Torvalds

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: default avatarRam Pai <linuxram@us.ibm.com>
Signed-off-by: default avatarSandipan Das <sandipan@linux.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Acked-by: default avatarDave 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.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent aef759db
...@@ -1002,6 +1002,17 @@ void test_read_of_access_disabled_region_with_page_already_mapped(int *ptr, ...@@ -1002,6 +1002,17 @@ void test_read_of_access_disabled_region_with_page_already_mapped(int *ptr,
expected_pkey_fault(pkey); 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) void test_write_of_write_disabled_region(int *ptr, u16 pkey)
{ {
dprintf1("disabling write access to PKEY[%02d], doing write\n", pkey); dprintf1("disabling write access to PKEY[%02d], doing write\n", pkey);
...@@ -1410,6 +1421,7 @@ void (*pkey_tests[])(int *ptr, u16 pkey) = { ...@@ -1410,6 +1421,7 @@ void (*pkey_tests[])(int *ptr, u16 pkey) = {
test_read_of_access_disabled_region, test_read_of_access_disabled_region,
test_read_of_access_disabled_region_with_page_already_mapped, test_read_of_access_disabled_region_with_page_already_mapped,
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_access_disabled_region, test_write_of_access_disabled_region,
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,
......
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