linux-kernel - [PATCH 4.14 09/71] xtensa: add missing isync to the cpu

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: <20190822171727.191206458@linuxfoundation.org>
Date:   Thu, 22 Aug 2019 10:18:44 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Max Filippov <jcmvbkbc@...il.com>
Subject: [PATCH 4.14 09/71] xtensa: add missing isync to the cpu_reset TLB code

From: Max Filippov <jcmvbkbc@...il.com>

commit cd8869f4cb257f22b89495ca40f5281e58ba359c upstream.

ITLB entry modifications must be followed by the isync instruction
before the new entries are possibly used. cpu_reset lacks one isync
between ITLB way 6 initialization and jump to the identity mapping.
Add missing isync to xtensa cpu_reset.

Cc: stable@...r.kernel.org
Signed-off-by: Max Filippov <jcmvbkbc@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/xtensa/kernel/setup.c |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/xtensa/kernel/setup.c
+++ b/arch/xtensa/kernel/setup.c
@@ -508,6 +508,7 @@ void cpu_reset(void)
 				      "add	%2, %2, %7\n\t"
 				      "addi	%0, %0, -1\n\t"
 				      "bnez	%0, 1b\n\t"
+				      "isync\n\t"
 				      /* Jump to identity mapping */
 				      "jx	%3\n"
 				      "2:\n\t"