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x86/pkeys/selftests: Allow faults on unknown keys

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The exec-only pkey is allocated inside the kernel and userspace
is not told what it is.  So, allow PK faults to occur that have
an unknown key.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Ellermen <mpe@ellerman.id.au>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ram Pai <linuxram@us.ibm.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/20180509171345.7FC7DA00@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Dave Hansen 2018-05-09 10:13:46 -07:00 committed by Ingo Molnar
parent caf9eb6b4c
commit 7e7fd67ca3
1 changed files with 9 additions and 1 deletions
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10
tools/testing/selftests/x86/protection_keys.c
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@ -921,13 +921,21 @@ void *malloc_pkey(long size, int prot, u16 pkey)
}
int last_pkru_faults;
#define UNKNOWN_PKEY -2
void expected_pk_fault(int pkey)
{
dprintf2("%s(): last_pkru_faults: %d pkru_faults: %d\n",
__func__, last_pkru_faults, pkru_faults);
dprintf2("%s(%d): last_si_pkey: %d\n", __func__, pkey, last_si_pkey);
pkey_assert(last_pkru_faults + 1 == pkru_faults);
pkey_assert(last_si_pkey == pkey);
/*
* For exec-only memory, we do not know the pkey in
* advance, so skip this check.
*/
if (pkey != UNKNOWN_PKEY)
pkey_assert(last_si_pkey == pkey);
/*
* The signal handler shold have cleared out PKRU to let the
* test program continue. We now have to restore it.