68 lines
2.4 KiB
Diff
68 lines
2.4 KiB
Diff
From 26e89424fe3c13d437f960736a7b925f3953cad6 Mon Sep 17 00:00:00 2001
|
|
From: Andy Lutomirski <luto@kernel.org>
|
|
Date: Sat, 4 Nov 2017 04:19:52 -0700
|
|
Subject: [PATCH 116/232] selftests/x86/ldt_get: Add a few additional tests for
|
|
limits
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
CVE-2017-5754
|
|
|
|
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>
|
|
(cherry picked from commit fec8f5ae1715a01c72ad52cb2ecd8aacaf142302)
|
|
Signed-off-by: Andy Whitcroft <apw@canonical.com>
|
|
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
|
|
(cherry picked from commit a1cdabf77d7ed9ba02697ad8beb04adf46a7c7b8)
|
|
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
|
|
---
|
|
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 05d0d6f49c2c..8e290c9b2c3f 100644
|
|
--- a/tools/testing/selftests/x86/ldt_gdt.c
|
|
+++ b/tools/testing/selftests/x86/ldt_gdt.c
|
|
@@ -403,9 +403,24 @@ 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);
|
|
}
|
|
|
|
--
|
|
2.14.2
|
|
|