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x86/pkeys/selftests: Give better unexpected fault error messages

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do_not_expect_pk_fault() is a helper that we call when we do not expect
a PK fault to have occurred.  But, it is a function, which means that
it obscures the line numbers from pkey_assert().  It also gives no
details.

Replace it with an implementation that gives nice line numbers and
also lets callers pass in a more descriptive message about what
happened that caused the unexpected fault.

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/20180509171338.55D13B64@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Dave Hansen 2018-05-09 10:13:38 -07:00 committed by Ingo Molnar
parent 59c2a7226f
commit 55556b0b20
1 changed files with 7 additions and 6 deletions
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13
tools/testing/selftests/x86/protection_keys.c
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@ -954,10 +954,11 @@ void expected_pk_fault(int pkey)
last_si_pkey = -1;
}
void do_not_expect_pk_fault(void)
{
pkey_assert(last_pkru_faults == pkru_faults);
}
#define do_not_expect_pk_fault(msg) do { \
if (last_pkru_faults != pkru_faults) \
dprintf0("unexpected PK fault: %s\n", msg); \
pkey_assert(last_pkru_faults == pkru_faults); \
} while (0)
int test_fds[10] = { -1 };
int nr_test_fds;
@ -1243,7 +1244,7 @@ void test_ptrace_of_child(int *ptr, u16 pkey)
pkey_assert(ret != -1);
/* Now access from the current task, and expect NO exception: */
peek_result = read_ptr(plain_ptr);
do_not_expect_pk_fault();
do_not_expect_pk_fault("read plain pointer after ptrace");
ret = ptrace(PTRACE_DETACH, child_pid, ignored, 0);
pkey_assert(ret != -1);
@ -1287,7 +1288,7 @@ void test_executing_on_unreadable_memory(int *ptr, u16 pkey)
*/
madvise(p1, PAGE_SIZE, MADV_DONTNEED);
lots_o_noops_around_write(&scratch);
do_not_expect_pk_fault();
do_not_expect_pk_fault("executing on PROT_EXEC memory");
ptr_contents = read_ptr(p1);
dprintf2("ptr (%p) contents@%d: %x\n", p1, __LINE__, ptr_contents);
expected_pk_fault(pkey);