From: tip-bot for Andy Lutomirski <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: peterz@infradead.org, bpetkov@suse.de,
torvalds@linux-foundation.org, tglx@linutronix.de,
luto@kernel.org, linux-kernel@vger.kernel.org, mingo@kernel.org,
hpa@zytor.com
Subject: [tip:x86/asm] selftests/x86/ldt_get: Add a few additional tests for limits
Date: Tue, 7 Nov 2017 02:18:16 -0800 [thread overview]
Message-ID: <tip-fec8f5ae1715a01c72ad52cb2ecd8aacaf142302@git.kernel.org> (raw)
In-Reply-To: <5601c15ea9b3113d288953fd2838b18bedf6bc67.1509794321.git.luto@kernel.org>
Commit-ID: fec8f5ae1715a01c72ad52cb2ecd8aacaf142302
Gitweb: https://git.kernel.org/tip/fec8f5ae1715a01c72ad52cb2ecd8aacaf142302
Author: Andy Lutomirski <luto@kernel.org>
AuthorDate: Sat, 4 Nov 2017 04:19:52 -0700
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 7 Nov 2017 11:13:43 +0100
selftests/x86/ldt_get: Add a few additional tests for limits
We weren't testing the .limit and .limit_in_pages fields very well.
Add more tests.
This addition seems to trigger the "bits 16:19 are undefined" issue
that was fixed in an earlier patch. I think that, at least on my
CPU, the high nibble of the limit ends in LAR bits 16:19.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bpetkov@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/5601c15ea9b3113d288953fd2838b18bedf6bc67.1509794321.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
tools/testing/selftests/x86/ldt_gdt.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/x86/ldt_gdt.c b/tools/testing/selftests/x86/ldt_gdt.c
index 3bb42ff..66e5ce5 100644
--- a/tools/testing/selftests/x86/ldt_gdt.c
+++ b/tools/testing/selftests/x86/ldt_gdt.c
@@ -404,9 +404,24 @@ static void do_simple_tests(void)
install_invalid(&desc, false);
desc.seg_not_present = 0;
- desc.read_exec_only = 0;
desc.seg_32bit = 1;
+ desc.read_exec_only = 0;
+ desc.limit = 0xfffff;
+
install_valid(&desc, AR_DPL3 | AR_TYPE_RWDATA | AR_S | AR_P | AR_DB);
+
+ desc.limit_in_pages = 1;
+
+ install_valid(&desc, AR_DPL3 | AR_TYPE_RWDATA | AR_S | AR_P | AR_DB | AR_G);
+ desc.read_exec_only = 1;
+ install_valid(&desc, AR_DPL3 | AR_TYPE_RODATA | AR_S | AR_P | AR_DB | AR_G);
+ desc.contents = 1;
+ desc.read_exec_only = 0;
+ install_valid(&desc, AR_DPL3 | AR_TYPE_RWDATA_EXPDOWN | AR_S | AR_P | AR_DB | AR_G);
+ desc.read_exec_only = 1;
+ install_valid(&desc, AR_DPL3 | AR_TYPE_RODATA_EXPDOWN | AR_S | AR_P | AR_DB | AR_G);
+
+ desc.limit = 0;
install_invalid(&desc, true);
}
next prev parent reply other threads:[~2017-11-07 10:22 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-04 11:19 [PATCH 0/5] Minor selftests improvements Andy Lutomirski
2017-11-04 11:19 ` [PATCH 1/5] selftests/x86/protection_keys: Fix syscall NR redefinition warnings Andy Lutomirski
2017-11-07 10:16 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2017-11-04 11:19 ` [PATCH 2/5] selftests/x86/ldt_gdt: Robustify against set_thread_area() and LAR oddities Andy Lutomirski
2017-11-07 10:17 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2017-11-04 11:19 ` [PATCH 3/5] selftests/x86/ldt_gdt: Add infrastructure to test set_thread_area() Andy Lutomirski
2017-11-07 10:17 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2017-11-04 11:19 ` [PATCH 4/5] selftests/x86/ldt_gdt: Run most existing LDT test cases against the GDT as well Andy Lutomirski
2017-11-07 10:17 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2017-11-04 11:19 ` [PATCH 5/5] selftests/x86/ldt_get: Add a few additional tests for limits Andy Lutomirski
2017-11-07 10:18 ` tip-bot for Andy Lutomirski [this message]
2017-11-07 10:13 ` [PATCH 0/5] Minor selftests improvements Ingo Molnar
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