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]
Message-ID: <20241028160917.1380714-11-alexander.shishkin@linux.intel.com>
Date: Mon, 28 Oct 2024 18:07:58 +0200
From: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To: Andy Lutomirski <luto@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ard Biesheuvel <ardb@...nel.org>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	Xiongwei Song <xiongwei.song@...driver.com>,
	Xin Li <xin3.li@...el.com>,
	"Mike Rapoport (IBM)" <rppt@...nel.org>,
	Brijesh Singh <brijesh.singh@....com>,
	Michael Roth <michael.roth@....com>,
	Tony Luck <tony.luck@...el.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Alexey Kardashevskiy <aik@....com>
Cc: Jonathan Corbet <corbet@....net>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Sohil Mehta <sohil.mehta@...el.com>,
	Ingo Molnar <mingo@...nel.org>,
	Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
	Daniel Sneddon <daniel.sneddon@...ux.intel.com>,
	Kai Huang <kai.huang@...el.com>,
	Sandipan Das <sandipan.das@....com>,
	Breno Leitao <leitao@...ian.org>,
	Rick Edgecombe <rick.p.edgecombe@...el.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Hou Tao <houtao1@...wei.com>,
	Juergen Gross <jgross@...e.com>,
	Vegard Nossum <vegard.nossum@...cle.com>,
	Kees Cook <kees@...nel.org>,
	Eric Biggers <ebiggers@...gle.com>,
	Jason Gunthorpe <jgg@...pe.ca>,
	"Masami Hiramatsu (Google)" <mhiramat@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Luis Chamberlain <mcgrof@...nel.org>,
	Yuntao Wang <ytcoode@...il.com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Tejun Heo <tj@...nel.org>,
	Changbin Du <changbin.du@...wei.com>,
	Huang Shijie <shijie@...amperecomputing.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Namhyung Kim <namhyung@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-efi@...r.kernel.org
Subject: [PATCH v5 10/16] x86/vsyscall: Disable LASS if vsyscall mode is set to EMULATE

From: Sohil Mehta <sohil.mehta@...el.com>

The EMULATE mode of vsyscall maps the vsyscall page into user address
space which can be read directly by the user application. This mode has
been deprecated recently and can only be enabled from a special command
line parameter vsyscall=emulate. See commit bf00745e7791 ("x86/vsyscall:
Remove CONFIG_LEGACY_VSYSCALL_EMULATE")

Fixing the LASS violations during the EMULATE mode would need complex
instruction decoding since the resulting #GP fault does not include any
useful error information and the vsyscall address is not readily
available in the RIP.

At this point, no one is expected to be using the insecure and
deprecated EMULATE mode. The rare usages that need support probably
don't care much about security anyway. Disable LASS when EMULATE mode is
requested during command line parsing to avoid breaking user software.
LASS will be supported if vsyscall mode is set to XONLY or NONE.

Signed-off-by: Sohil Mehta <sohil.mehta@...el.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
---
 arch/x86/entry/vsyscall/vsyscall_64.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/x86/entry/vsyscall/vsyscall_64.c b/arch/x86/entry/vsyscall/vsyscall_64.c
index 97608883b4b4..7c845c1db3b4 100644
--- a/arch/x86/entry/vsyscall/vsyscall_64.c
+++ b/arch/x86/entry/vsyscall/vsyscall_64.c
@@ -36,6 +36,7 @@
 #include <asm/vsyscall.h>
 #include <asm/unistd.h>
 #include <asm/fixmap.h>
+#include <asm/tlbflush.h>
 #include <asm/traps.h>
 #include <asm/paravirt.h>
 
@@ -63,6 +64,13 @@ static int __init vsyscall_setup(char *str)
 		else
 			return -EINVAL;
 
+		if (cpu_feature_enabled(X86_FEATURE_LASS) &&
+		    vsyscall_mode == EMULATE) {
+			cr4_clear_bits(X86_CR4_LASS);
+			setup_clear_cpu_cap(X86_FEATURE_LASS);
+			pr_warn_once("x86/cpu: Disabling LASS support due to vsyscall=emulate\n");
+		}
+
 		return 0;
 	}
 
-- 
2.45.2


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ