lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Sun, 10 Dec 2017 22:47:18 -0800
From:   Andy Lutomirski <luto@...nel.org>
To:     x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, Borislav Petkov <bp@...en8.de>,
        Brian Gerst <brgerst@...il.com>,
        David Laight <David.Laight@...lab.com>,
        Kees Cook <keescook@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>
Subject: [PATCH PTI v2 2/6] Revert "x86/mm/pti: Disable native VSYSCALL"

This reverts commit 6a7b4041b853ecc653e2c1dda5b736ab5fd29357.

With the PGD-propagation logic simplified, there's no need for this.
---
 arch/x86/Kconfig | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 411838058194..babb1e53b0a6 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2233,9 +2233,6 @@ choice
 
 	config LEGACY_VSYSCALL_NATIVE
 		bool "Native"
-		# The VSYSCALL page comes from the kernel page tables
-		# and is not available when PAGE_TABLE_ISOLATION is enabled.
-		depends on !PAGE_TABLE_ISOLATION
 		help
 		  Actual executable code is located in the fixed vsyscall
 		  address mapping, implementing time() efficiently. Since
@@ -2253,11 +2250,6 @@ choice
 		  exploits. This configuration is recommended when userspace
 		  still uses the vsyscall area.
 
-		  When PAGE_TABLE_ISOLATION is enabled, the vsyscall area will become
-		  unreadable.  This emulation option still works, but PAGE_TABLE_ISOLATION
-		  will make it harder to do things like trace code using the
-		  emulation.
-
 	config LEGACY_VSYSCALL_NONE
 		bool "None"
 		help
-- 
2.13.6

Powered by blists - more mailing lists