49 lines
1.8 KiB
Diff
49 lines
1.8 KiB
Diff
From 181d224dabca9a9061a6955cf3d49a4eba7294bf Mon Sep 17 00:00:00 2001
|
|
From: Andy Lutomirski <luto@kernel.org>
|
|
Date: Thu, 2 Nov 2017 00:59:11 -0700
|
|
Subject: [PATCH 099/232] x86/entry: Add task_top_of_stack() to find the top of
|
|
a task's stack
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
CVE-2017-5754
|
|
|
|
This will let us get rid of a few places that hardcode accesses to
|
|
thread.sp0.
|
|
|
|
Signed-off-by: Andy Lutomirski <luto@kernel.org>
|
|
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/b49b3f95a8ff858c40c9b0f5b32be0355324327d.1509609304.git.luto@kernel.org
|
|
Signed-off-by: Ingo Molnar <mingo@kernel.org>
|
|
(cherry picked from commit 3500130b84a3cdc5b6796eba1daf178944935efe)
|
|
Signed-off-by: Andy Whitcroft <apw@canonical.com>
|
|
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
|
|
(cherry picked from commit f1078e10e361afaeb22ee72c54d5ad397e19728d)
|
|
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
|
|
---
|
|
arch/x86/include/asm/processor.h | 2 ++
|
|
1 file changed, 2 insertions(+)
|
|
|
|
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
|
|
index 85ddfc1a9bb5..f83fbf1b6dd9 100644
|
|
--- a/arch/x86/include/asm/processor.h
|
|
+++ b/arch/x86/include/asm/processor.h
|
|
@@ -788,6 +788,8 @@ static inline void spin_lock_prefetch(const void *x)
|
|
#define TOP_OF_INIT_STACK ((unsigned long)&init_stack + sizeof(init_stack) - \
|
|
TOP_OF_KERNEL_STACK_PADDING)
|
|
|
|
+#define task_top_of_stack(task) ((unsigned long)(task_pt_regs(task) + 1))
|
|
+
|
|
#ifdef CONFIG_X86_32
|
|
/*
|
|
* User space process size: 3GB (default).
|
|
--
|
|
2.14.2
|
|
|