48 lines
1.8 KiB
Diff
48 lines
1.8 KiB
Diff
From 181d224dabca9a9061a6955cf3d49a4eba7294bf 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 00:59:11 -0700
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Subject: [PATCH 099/233] x86/entry: Add task_top_of_stack() to find the top of
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a task's stack
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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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This will let us get rid of a few places that hardcode accesses to
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thread.sp0.
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Signed-off-by: Andy Lutomirski <luto@kernel.org>
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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/b49b3f95a8ff858c40c9b0f5b32be0355324327d.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 3500130b84a3cdc5b6796eba1daf178944935efe)
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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 f1078e10e361afaeb22ee72c54d5ad397e19728d)
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Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
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---
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arch/x86/include/asm/processor.h | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
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index 85ddfc1a9bb5..f83fbf1b6dd9 100644
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--- a/arch/x86/include/asm/processor.h
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+++ b/arch/x86/include/asm/processor.h
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@@ -788,6 +788,8 @@ static inline void spin_lock_prefetch(const void *x)
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#define TOP_OF_INIT_STACK ((unsigned long)&init_stack + sizeof(init_stack) - \
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TOP_OF_KERNEL_STACK_PADDING)
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+#define task_top_of_stack(task) ((unsigned long)(task_pt_regs(task) + 1))
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+
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#ifdef CONFIG_X86_32
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/*
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* User space process size: 3GB (default).
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--
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2.14.2
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