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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. Signed-off-by: Ram Pai <linuxram@us.ibm.com> Signed-off: 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/4a19cf9252c03dd883887e9002881599e6900d06.1585646528.git.sandipan@linux.ibm.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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1 changed files with 19 additions and 0 deletions
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@ -984,6 +984,24 @@ void test_read_of_access_disabled_region(int *ptr, u16 pkey)
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dprintf1("*ptr: %d\n", ptr_contents);
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expected_pkey_fault(pkey);
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}
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void test_read_of_access_disabled_region_with_page_already_mapped(int *ptr,
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u16 pkey)
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{
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int ptr_contents;
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dprintf1("disabling access to PKEY[%02d], doing read @ %p\n",
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pkey, ptr);
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ptr_contents = read_ptr(ptr);
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dprintf1("reading ptr before disabling the read : %d\n",
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ptr_contents);
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read_pkey_reg();
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pkey_access_deny(pkey);
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ptr_contents = read_ptr(ptr);
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dprintf1("*ptr: %d\n", ptr_contents);
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expected_pkey_fault(pkey);
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}
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void test_write_of_write_disabled_region(int *ptr, u16 pkey)
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{
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dprintf1("disabling write access to PKEY[%02d], doing write\n", pkey);
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@ -1390,6 +1408,7 @@ void test_mprotect_pkey_on_unsupported_cpu(int *ptr, u16 pkey)
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void (*pkey_tests[])(int *ptr, u16 pkey) = {
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test_read_of_write_disabled_region,
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test_read_of_access_disabled_region,
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test_read_of_access_disabled_region_with_page_already_mapped,
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test_write_of_write_disabled_region,
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test_write_of_access_disabled_region,
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test_kernel_write_of_access_disabled_region,
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