From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f200.google.com (mail-pf0-f200.google.com [209.85.192.200]) by kanga.kvack.org (Postfix) with ESMTP id 9137A6B028E for ; Sun, 17 Jun 2018 07:50:05 -0400 (EDT) Received: by mail-pf0-f200.google.com with SMTP id x17-v6so7084285pfm.18 for ; Sun, 17 Jun 2018 04:50:05 -0700 (PDT) Received: from mail.kernel.org (mail.kernel.org. [198.145.29.99]) by mx.google.com with ESMTPS id g15-v6si10277771pgf.249.2018.06.17.04.50.04 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 17 Jun 2018 04:50:04 -0700 (PDT) Subject: Patch "x86/pkeys/selftests: Give better unexpected fault error messages" has been added to the 4.16-stable tree From: Date: Sun, 17 Jun 2018 13:23:54 +0200 Message-ID: <1529234634239175@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org List-ID: To: 20180509171338.55D13B64@viggo.jf.intel.com, akpm@linux-foundation.org, alexander.levin@microsoft.com, dave.hansen@intel.com, dave.hansen@linux.intel.com, gregkh@linuxfoundation.org, linux-mm@kvack.org, linuxram@us.ibm.com, mingo@kernel.org, mpe@ellerman.id.au, peterz@infradead.org, shuah@kernel.org, tglx@linutronix.de, torvalds@linux-foundation.org Cc: stable-commits@vger.kernel.org This is a note to let you know that I've just added the patch titled x86/pkeys/selftests: Give better unexpected fault error messages to the 4.16-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: x86-pkeys-selftests-give-better-unexpected-fault-error-messages.patch and it can be found in the queue-4.16 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From foo@baz Sun Jun 17 12:07:34 CEST 2018 From: Dave Hansen Date: Wed, 9 May 2018 10:13:38 -0700 Subject: x86/pkeys/selftests: Give better unexpected fault error messages From: Dave Hansen [ Upstream commit 55556b0b2016806b2e16a20b62d143383983a34a ] 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 Cc: Andrew Morton Cc: Dave Hansen Cc: Linus Torvalds Cc: Michael Ellermen Cc: Peter Zijlstra Cc: Ram Pai Cc: Shuah Khan Cc: Thomas Gleixner Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/20180509171338.55D13B64@viggo.jf.intel.com Signed-off-by: Ingo Molnar Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- tools/testing/selftests/x86/protection_keys.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) --- a/tools/testing/selftests/x86/protection_keys.c +++ b/tools/testing/selftests/x86/protection_keys.c @@ -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_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 */ 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); Patches currently in stable-queue which might be from dave.hansen@linux.intel.com are queue-4.16/x86-pkeys-selftests-factor-out-instruction-page.patch queue-4.16/x86-pkeys-selftests-fix-pointer-math.patch queue-4.16/x86-pkeys-selftests-adjust-the-self-test-to-fresh-distros-that-export-the-pkeys-abi.patch queue-4.16/x86-pkeys-selftests-add-a-test-for-pkey-0.patch queue-4.16/x86-pkeys-selftests-stop-using-assert.patch queue-4.16/x86-pkeys-selftests-save-off-prot-for-allocations.patch queue-4.16/x86-pkeys-selftests-remove-dead-debugging-code-fix-dprint_in_signal.patch queue-4.16/x86-mpx-selftests-adjust-the-self-test-to-fresh-distros-that-export-the-mpx-abi.patch queue-4.16/x86-pkeys-selftests-add-prot_exec-test.patch queue-4.16/x86-pkeys-selftests-allow-faults-on-unknown-keys.patch queue-4.16/x86-pkeys-selftests-give-better-unexpected-fault-error-messages.patch queue-4.16/x86-pkeys-selftests-avoid-printf-in-signal-deadlocks.patch queue-4.16/x86-pkeys-selftests-fix-pkey-exhaustion-test-off-by-one.patch