2018-01-06 14:13:39 +00:00
|
|
|
From 870277eb767ecec9293c5dd5ba5bf1c912251e85 Mon Sep 17 00:00:00 2001
|
|
|
|
|
From: Andy Lutomirski <luto@kernel.org>
|
|
|
|
|
Date: Thu, 2 Nov 2017 00:59:15 -0700
|
2018-01-08 09:25:09 +00:00
|
|
|
Subject: [PATCH 103/241] x86/entry/32: Fix cpu_current_top_of_stack
|
2018-01-06 14:13:39 +00:00
|
|
|
initialization at boot
|
|
|
|
|
MIME-Version: 1.0
|
|
|
|
|
Content-Type: text/plain; charset=UTF-8
|
|
|
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
|
|
|
|
|
|
CVE-2017-5754
|
|
|
|
|
|
|
|
|
|
cpu_current_top_of_stack's initialization forgot about
|
|
|
|
|
TOP_OF_KERNEL_STACK_PADDING. This bug didn't matter because the
|
|
|
|
|
idle threads never enter user mode.
|
|
|
|
|
|
|
|
|
|
Signed-off-by: Andy Lutomirski <luto@kernel.org>
|
|
|
|
|
Reviewed-by: Borislav Petkov <bp@suse.de>
|
|
|
|
|
Cc: Borislav Petkov <bpetkov@suse.de>
|
|
|
|
|
Cc: Brian Gerst <brgerst@gmail.com>
|
|
|
|
|
Cc: Dave Hansen <dave.hansen@intel.com>
|
|
|
|
|
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/e5e370a7e6e4fddd1c4e4cf619765d96bb874b21.1509609304.git.luto@kernel.org
|
|
|
|
|
Signed-off-by: Ingo Molnar <mingo@kernel.org>
|
|
|
|
|
(cherry picked from commit cd493a6deb8b78eca280d05f7fa73fd69403ae29)
|
|
|
|
|
Signed-off-by: Andy Whitcroft <apw@canonical.com>
|
|
|
|
|
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
|
|
|
|
|
(cherry picked from commit 258c98e7d4b8f1459772e656cd736c028a13add9)
|
|
|
|
|
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
|
|
|
|
|
---
|
|
|
|
|
arch/x86/kernel/smpboot.c | 3 +--
|
|
|
|
|
1 file changed, 1 insertion(+), 2 deletions(-)
|
|
|
|
|
|
|
|
|
|
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
|
|
|
|
|
index d05006f6c31c..8ea3b18cbdc1 100644
|
|
|
|
|
--- a/arch/x86/kernel/smpboot.c
|
|
|
|
|
+++ b/arch/x86/kernel/smpboot.c
|
|
|
|
|
@@ -961,8 +961,7 @@ void common_cpu_up(unsigned int cpu, struct task_struct *idle)
|
|
|
|
|
#ifdef CONFIG_X86_32
|
|
|
|
|
/* Stack for startup_32 can be just as for start_secondary onwards */
|
|
|
|
|
irq_ctx_init(cpu);
|
|
|
|
|
- per_cpu(cpu_current_top_of_stack, cpu) =
|
|
|
|
|
- (unsigned long)task_stack_page(idle) + THREAD_SIZE;
|
|
|
|
|
+ per_cpu(cpu_current_top_of_stack, cpu) = task_top_of_stack(idle);
|
|
|
|
|
#else
|
|
|
|
|
initial_gs = per_cpu_offset(cpu);
|
|
|
|
|
#endif
|
|
|
|
|
--
|
|
|
|
|
2.14.2
|
|
|
|
|
|
