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From: Peter Zijlstra <peterz@infradead.org>
To: linux-kernel@vger.kernel.org, tglx@linutronix.de
Cc: x86@kernel.org, Linus Torvalds <torvalds@linux-foundation.org>,
	Andy Lutomirsky <luto@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Dave Hansen <dave.hansen@intel.com>,
	Borislav Petkov <bpetkov@suse.de>,
	Greg KH <gregkh@linuxfoundation.org>,
	keescook@google.com, hughd@google.com,
	Brian Gerst <brgerst@gmail.com>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	Denys Vlasenko <dvlasenk@redhat.com>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	Juergen Gross <jgross@suse.com>,
	David Laight <David.Laight@aculab.com>,
	Eduardo Valentin <eduval@amazon.com>,
	aliguori@amazon.com, Will Deacon <will.deacon@arm.com>,
	linux-mm@kvack.org, kirill.shutemov@linux.intel.com,
	dan.j.williams@intel.com
Subject: [PATCH v2 11/17] selftests/x86/ldt_gdt: Prepare for access bit forced
Date: Thu, 14 Dec 2017 12:27:37 +0100	[thread overview]
Message-ID: <20171214113851.647809433@infradead.org> (raw)
In-Reply-To: <20171214112726.742649793@infradead.org>

[-- Attachment #1: selftests-x86-ldt_gdt--Prepare-for-access-bit-forced.patch --]
[-- Type: text/plain, Size: 1105 bytes --]

From: Thomas Gleixner <tglx@linutronix.de>

In order to make the LDT mapping RO the access bit needs to be forced by
the kernel. Adjust the test case so it handles that gracefully.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 tools/testing/selftests/x86/ldt_gdt.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/tools/testing/selftests/x86/ldt_gdt.c
+++ b/tools/testing/selftests/x86/ldt_gdt.c
@@ -122,8 +122,7 @@ static void check_valid_segment(uint16_t
 	 * NB: Different Linux versions do different things with the
 	 * accessed bit in set_thread_area().
 	 */
-	if (ar != expected_ar &&
-	    (ldt || ar != (expected_ar | AR_ACCESSED))) {
+	if (ar != expected_ar && ar != (expected_ar | AR_ACCESSED)) {
 		printf("[FAIL]\t%s entry %hu has AR 0x%08X but expected 0x%08X\n",
 		       (ldt ? "LDT" : "GDT"), index, ar, expected_ar);
 		nerrs++;


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  parent reply	other threads:[~2017-12-14 11:43 UTC|newest]

Thread overview: 76+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-12-14 11:27 [PATCH v2 00/17] x86/ldt: Use a VMA based read only mapping Peter Zijlstra
2017-12-14 11:27 ` [PATCH v2 01/17] mm/gup: Fixup p*_access_permitted() Peter Zijlstra
2017-12-14 12:41   ` Peter Zijlstra
2017-12-14 14:37     ` Peter Zijlstra
2017-12-14 20:44       ` Dave Hansen
2017-12-14 20:54         ` Peter Zijlstra
2017-12-14 21:18           ` Peter Zijlstra
2017-12-15  5:04           ` Dave Hansen
2017-12-15  6:09             ` Linus Torvalds
2017-12-15  7:51               ` Peter Zijlstra
2017-12-16  0:20                 ` Linus Torvalds
2017-12-16  0:29                   ` Dan Williams
2017-12-16  1:10                     ` Linus Torvalds
2017-12-16  1:25                       ` Dave Hansen
2017-12-16  2:28                         ` Linus Torvalds
2017-12-16  2:48                           ` Al Viro
2017-12-16  2:52                             ` Linus Torvalds
2017-12-16  3:00                               ` Linus Torvalds
2017-12-16  3:21                               ` Dave Hansen
2017-12-16  1:29                       ` Dan Williams
2017-12-16  0:31                   ` Al Viro
2017-12-16  1:05                     ` Linus Torvalds
2017-12-15  8:00             ` Peter Zijlstra
2017-12-15 10:25               ` Peter Zijlstra
2017-12-15 11:38                 ` Peter Zijlstra
2017-12-15 16:38                   ` Dan Williams
2017-12-18 11:54                     ` Peter Zijlstra
2017-12-18 18:42                       ` Dan Williams
2017-12-15 14:04       ` Peter Zijlstra
2017-12-14 11:27 ` [PATCH v2 02/17] mm: Exempt special mappings from mlock(), mprotect() and madvise() Peter Zijlstra
2017-12-14 16:19   ` Andy Lutomirski
2017-12-14 17:36     ` Peter Zijlstra
2018-01-02 16:44       ` Dmitry Safonov
2017-12-14 11:27 ` [PATCH v2 03/17] arch: Allow arch_dup_mmap() to fail Peter Zijlstra
2017-12-14 16:22   ` Andy Lutomirski
2017-12-14 11:27 ` [PATCH v2 04/17] x86/ldt: Rework locking Peter Zijlstra
2017-12-14 11:27 ` [PATCH v2 05/17] x86/ldt: Prevent ldt inheritance on exec Peter Zijlstra
2017-12-14 16:32   ` Andy Lutomirski
2017-12-14 11:27 ` [PATCH v2 06/17] x86/ldt: Do not install LDT for kernel threads Peter Zijlstra
2017-12-14 19:43   ` Peter Zijlstra
2017-12-14 21:27     ` Andy Lutomirski
2017-12-14 11:27 ` [PATCH v2 07/17] mm/softdirty: Move VM_SOFTDIRTY into high bits Peter Zijlstra
2017-12-14 11:27 ` [PATCH v2 08/17] mm/x86: Allow special mappings with user access cleared Peter Zijlstra
2017-12-14 11:27 ` [PATCH v2 09/17] mm: Provide vm_special_mapping::close Peter Zijlstra
2017-12-14 11:27 ` [PATCH v2 10/17] selftest/x86: Implement additional LDT selftests Peter Zijlstra
2017-12-14 11:27 ` Peter Zijlstra [this message]
2017-12-14 16:20   ` [PATCH v2 11/17] selftests/x86/ldt_gdt: Prepare for access bit forced Andy Lutomirski
2017-12-14 19:43     ` Linus Torvalds
2017-12-14 21:22       ` Andy Lutomirski
2017-12-14 21:44         ` Linus Torvalds
2017-12-14 21:48           ` Linus Torvalds
2017-12-14 22:02             ` Peter Zijlstra
2017-12-14 22:14               ` Linus Torvalds
2017-12-14 22:24                 ` Peter Zijlstra
2017-12-14 22:52                   ` Linus Torvalds
2017-12-14 22:11             ` Andy Lutomirski
2017-12-14 22:15               ` Linus Torvalds
2017-12-14 22:30                 ` Andy Lutomirski
2017-12-14 22:23           ` Thomas Gleixner
2017-12-14 22:50             ` Linus Torvalds
2017-12-14 11:27 ` [PATCH v2 12/17] mm: Make populate_vma_page_range() available Peter Zijlstra
2017-12-14 11:27 ` [PATCH v2 13/17] x86/mm: Force LDT desc accessed bit Peter Zijlstra
2017-12-14 16:21   ` Andy Lutomirski
2017-12-14 11:27 ` [PATCH v2 14/17] x86/ldt: Reshuffle code Peter Zijlstra
2017-12-14 16:23   ` Andy Lutomirski
2017-12-14 16:31     ` Thomas Gleixner
2017-12-14 16:32       ` Thomas Gleixner
2017-12-14 16:34         ` Andy Lutomirski
2017-12-14 17:47           ` Peter Zijlstra
2017-12-14 11:27 ` [PATCH v2 15/17] x86/ldt: Prepare for VMA mapping Peter Zijlstra
2017-12-14 11:27 ` [PATCH v2 16/17] x86/ldt: Add VMA management code Peter Zijlstra
2017-12-14 11:27 ` [PATCH v2 17/17] x86/ldt: Make it read only VMA mapped Peter Zijlstra
2017-12-14 12:03 ` [PATCH v2 00/17] x86/ldt: Use a VMA based read only mapping Thomas Gleixner
2017-12-14 12:08   ` Peter Zijlstra
2017-12-14 16:35     ` Andy Lutomirski
2017-12-14 17:50       ` Peter Zijlstra

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