224 lines
7.7 KiB
Diff
224 lines
7.7 KiB
Diff
From 050fcd1a748bd2f17b540d0147c8a4f3067653ee Mon Sep 17 00:00:00 2001
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From: Masami Hiramatsu <mhiramat@kernel.org>
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Date: Thu, 3 Aug 2017 11:38:21 +0900
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Subject: [PATCH 023/232] irq: Make the irqentry text section unconditional
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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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Generate irqentry and softirqentry text sections without
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any Kconfig dependencies. This will add extra sections, but
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there should be no performace impact.
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Suggested-by: Ingo Molnar <mingo@kernel.org>
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Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
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Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
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Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
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Cc: Chris Zankel <chris@zankel.net>
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Cc: David S . Miller <davem@davemloft.net>
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Cc: Francis Deslauriers <francis.deslauriers@efficios.com>
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Cc: Jesper Nilsson <jesper.nilsson@axis.com>
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Cc: Linus Torvalds <torvalds@linux-foundation.org>
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Cc: Max Filippov <jcmvbkbc@gmail.com>
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Cc: Mikael Starvik <starvik@axis.com>
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Cc: Peter Zijlstra <peterz@infradead.org>
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Cc: Thomas Gleixner <tglx@linutronix.de>
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Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
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Cc: linux-arch@vger.kernel.org
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Cc: linux-cris-kernel@axis.com
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Cc: mathieu.desnoyers@efficios.com
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Link: http://lkml.kernel.org/r/150172789110.27216.3955739126693102122.stgit@devbox
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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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(cherry picked from commit 229a71860547ec856b156179a9c6bef2de426f66)
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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 8fd2f68cc93ae772cfddf4151d13448ff17d0229)
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Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
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---
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arch/arm/include/asm/traps.h | 7 -------
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arch/arm64/include/asm/traps.h | 7 -------
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include/asm-generic/sections.h | 4 ++++
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include/asm-generic/vmlinux.lds.h | 8 --------
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include/linux/interrupt.h | 14 +-------------
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arch/x86/kernel/unwind_frame.c | 2 --
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arch/x86/entry/entry_64.S | 9 ++-------
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7 files changed, 7 insertions(+), 44 deletions(-)
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diff --git a/arch/arm/include/asm/traps.h b/arch/arm/include/asm/traps.h
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index f555bb3664dc..683d9230984a 100644
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--- a/arch/arm/include/asm/traps.h
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+++ b/arch/arm/include/asm/traps.h
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@@ -18,7 +18,6 @@ struct undef_hook {
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void register_undef_hook(struct undef_hook *hook);
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void unregister_undef_hook(struct undef_hook *hook);
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-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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static inline int __in_irqentry_text(unsigned long ptr)
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{
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extern char __irqentry_text_start[];
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@@ -27,12 +26,6 @@ static inline int __in_irqentry_text(unsigned long ptr)
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return ptr >= (unsigned long)&__irqentry_text_start &&
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ptr < (unsigned long)&__irqentry_text_end;
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}
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-#else
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-static inline int __in_irqentry_text(unsigned long ptr)
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-{
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- return 0;
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-}
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-#endif
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static inline int in_exception_text(unsigned long ptr)
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{
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diff --git a/arch/arm64/include/asm/traps.h b/arch/arm64/include/asm/traps.h
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index 02e9035b0685..47a9066f7c86 100644
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--- a/arch/arm64/include/asm/traps.h
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+++ b/arch/arm64/include/asm/traps.h
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@@ -37,18 +37,11 @@ void unregister_undef_hook(struct undef_hook *hook);
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void arm64_notify_segfault(struct pt_regs *regs, unsigned long addr);
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-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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static inline int __in_irqentry_text(unsigned long ptr)
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{
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return ptr >= (unsigned long)&__irqentry_text_start &&
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ptr < (unsigned long)&__irqentry_text_end;
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}
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-#else
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-static inline int __in_irqentry_text(unsigned long ptr)
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-{
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- return 0;
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-}
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-#endif
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static inline int in_exception_text(unsigned long ptr)
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{
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diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h
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index 532372c6cf15..e5da44eddd2f 100644
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--- a/include/asm-generic/sections.h
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+++ b/include/asm-generic/sections.h
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@@ -27,6 +27,8 @@
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* __kprobes_text_start, __kprobes_text_end
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* __entry_text_start, __entry_text_end
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* __ctors_start, __ctors_end
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+ * __irqentry_text_start, __irqentry_text_end
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+ * __softirqentry_text_start, __softirqentry_text_end
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*/
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extern char _text[], _stext[], _etext[];
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extern char _data[], _sdata[], _edata[];
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@@ -39,6 +41,8 @@ extern char __per_cpu_load[], __per_cpu_start[], __per_cpu_end[];
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extern char __kprobes_text_start[], __kprobes_text_end[];
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extern char __entry_text_start[], __entry_text_end[];
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extern char __start_rodata[], __end_rodata[];
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+extern char __irqentry_text_start[], __irqentry_text_end[];
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+extern char __softirqentry_text_start[], __softirqentry_text_end[];
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/* Start and end of .ctors section - used for constructor calls. */
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extern char __ctors_start[], __ctors_end[];
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diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
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index 9623d78f8494..e7e955d4ab9e 100644
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--- a/include/asm-generic/vmlinux.lds.h
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+++ b/include/asm-generic/vmlinux.lds.h
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@@ -497,25 +497,17 @@
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*(.entry.text) \
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VMLINUX_SYMBOL(__entry_text_end) = .;
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-#if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_KASAN)
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#define IRQENTRY_TEXT \
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ALIGN_FUNCTION(); \
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VMLINUX_SYMBOL(__irqentry_text_start) = .; \
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*(.irqentry.text) \
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VMLINUX_SYMBOL(__irqentry_text_end) = .;
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-#else
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-#define IRQENTRY_TEXT
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-#endif
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-#if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_KASAN)
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#define SOFTIRQENTRY_TEXT \
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ALIGN_FUNCTION(); \
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VMLINUX_SYMBOL(__softirqentry_text_start) = .; \
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*(.softirqentry.text) \
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VMLINUX_SYMBOL(__softirqentry_text_end) = .;
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-#else
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-#define SOFTIRQENTRY_TEXT
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-#endif
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/* Section used for early init (in .S files) */
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#define HEAD_TEXT *(.head.text)
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diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
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index a2fddddb0d60..59ba11661b6e 100644
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--- a/include/linux/interrupt.h
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+++ b/include/linux/interrupt.h
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@@ -18,6 +18,7 @@
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#include <linux/atomic.h>
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#include <asm/ptrace.h>
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#include <asm/irq.h>
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+#include <asm/sections.h>
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/*
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* These correspond to the IORESOURCE_IRQ_* defines in
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@@ -726,7 +727,6 @@ extern int early_irq_init(void);
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extern int arch_probe_nr_irqs(void);
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extern int arch_early_irq_init(void);
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-#if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_KASAN)
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/*
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* We want to know which function is an entrypoint of a hardirq or a softirq.
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*/
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@@ -734,16 +734,4 @@ extern int arch_early_irq_init(void);
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#define __softirq_entry \
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__attribute__((__section__(".softirqentry.text")))
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-/* Limits of hardirq entrypoints */
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-extern char __irqentry_text_start[];
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-extern char __irqentry_text_end[];
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-/* Limits of softirq entrypoints */
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-extern char __softirqentry_text_start[];
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-extern char __softirqentry_text_end[];
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-
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-#else
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-#define __irq_entry
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-#define __softirq_entry
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-#endif
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-
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#endif
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diff --git a/arch/x86/kernel/unwind_frame.c b/arch/x86/kernel/unwind_frame.c
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index b9389d72b2f7..c29e5bc7e9c9 100644
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--- a/arch/x86/kernel/unwind_frame.c
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+++ b/arch/x86/kernel/unwind_frame.c
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@@ -91,10 +91,8 @@ static bool in_entry_code(unsigned long ip)
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if (addr >= __entry_text_start && addr < __entry_text_end)
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return true;
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-#if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_KASAN)
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if (addr >= __irqentry_text_start && addr < __irqentry_text_end)
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return true;
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-#endif
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return false;
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}
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diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
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index 4dbb336a1fdd..ca0b250eefc4 100644
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--- a/arch/x86/entry/entry_64.S
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+++ b/arch/x86/entry/entry_64.S
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@@ -761,13 +761,8 @@ apicinterrupt3 \num trace(\sym) smp_trace(\sym)
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#endif
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/* Make sure APIC interrupt handlers end up in the irqentry section: */
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-#if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_KASAN)
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-# define PUSH_SECTION_IRQENTRY .pushsection .irqentry.text, "ax"
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-# define POP_SECTION_IRQENTRY .popsection
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-#else
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-# define PUSH_SECTION_IRQENTRY
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-# define POP_SECTION_IRQENTRY
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-#endif
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+#define PUSH_SECTION_IRQENTRY .pushsection .irqentry.text, "ax"
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+#define POP_SECTION_IRQENTRY .popsection
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.macro apicinterrupt num sym do_sym
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PUSH_SECTION_IRQENTRY
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--
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2.14.2
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