2018-01-06 14:13:39 +00:00
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From 870277eb767ecec9293c5dd5ba5bf1c912251e85 Mon Sep 17 00:00:00 2001
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From: Andy Lutomirski <luto@kernel.org>
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Date: Thu, 2 Nov 2017 00:59:15 -0700
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2018-01-07 12:17:59 +00:00
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Subject: [PATCH 103/233] x86/entry/32: Fix cpu_current_top_of_stack
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2018-01-06 14:13:39 +00:00
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initialization at boot
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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CVE-2017-5754
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cpu_current_top_of_stack's initialization forgot about
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TOP_OF_KERNEL_STACK_PADDING. This bug didn't matter because the
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idle threads never enter user mode.
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Signed-off-by: Andy Lutomirski <luto@kernel.org>
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Reviewed-by: Borislav Petkov <bp@suse.de>
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Cc: Borislav Petkov <bpetkov@suse.de>
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Cc: Brian Gerst <brgerst@gmail.com>
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Cc: Dave Hansen <dave.hansen@intel.com>
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Cc: Linus Torvalds <torvalds@linux-foundation.org>
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Cc: Peter Zijlstra <peterz@infradead.org>
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Cc: Thomas Gleixner <tglx@linutronix.de>
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Link: http://lkml.kernel.org/r/e5e370a7e6e4fddd1c4e4cf619765d96bb874b21.1509609304.git.luto@kernel.org
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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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(cherry picked from commit cd493a6deb8b78eca280d05f7fa73fd69403ae29)
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Signed-off-by: Andy Whitcroft <apw@canonical.com>
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Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
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(cherry picked from commit 258c98e7d4b8f1459772e656cd736c028a13add9)
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Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
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---
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arch/x86/kernel/smpboot.c | 3 +--
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1 file changed, 1 insertion(+), 2 deletions(-)
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diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
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index d05006f6c31c..8ea3b18cbdc1 100644
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--- a/arch/x86/kernel/smpboot.c
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+++ b/arch/x86/kernel/smpboot.c
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@@ -961,8 +961,7 @@ void common_cpu_up(unsigned int cpu, struct task_struct *idle)
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#ifdef CONFIG_X86_32
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/* Stack for startup_32 can be just as for start_secondary onwards */
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irq_ctx_init(cpu);
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- per_cpu(cpu_current_top_of_stack, cpu) =
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- (unsigned long)task_stack_page(idle) + THREAD_SIZE;
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+ per_cpu(cpu_current_top_of_stack, cpu) = task_top_of_stack(idle);
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#else
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initial_gs = per_cpu_offset(cpu);
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#endif
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--
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2.14.2
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