linux-kernel - [PATCH 4.14 034/159] ptrace,x86: Make user_64bit

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Date:   Fri, 22 Dec 2017 09:45:19 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Borislav Petkov <bp@...e.de>,
        Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        ricardo.neri@...el.com, Adrian Hunter <adrian.hunter@...el.com>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Huang Rui <ray.huang@....com>,
        Qiaowei Ren <qiaowei.ren@...el.com>,
        Shuah Khan <shuah@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Jonathan Corbet <corbet@....net>, Jiri Slaby <jslaby@...e.cz>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Brian Gerst <brgerst@...il.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Colin Ian King <colin.king@...onical.com>,
        Chen Yucong <slaoub@...il.com>,
        Adam Buchbinder <adam.buchbinder@...il.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Lorenzo Stoakes <lstoakes@...il.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Garnier <thgarnie@...gle.com>
Subject: [PATCH 4.14 034/159] ptrace,x86: Make user_64bit_mode() available to 32-bit builds

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>

commit e27c310af5c05cf876d9cad006928076c27f54d4 upstream.

In its current form, user_64bit_mode() can only be used when CONFIG_X86_64
is selected. This implies that code built with CONFIG_X86_64=n cannot use
it. If a piece of code needs to be built for both CONFIG_X86_64=y and
CONFIG_X86_64=n and wants to use this function, it needs to wrap it in
an #ifdef/#endif; potentially, in multiple places.

This can be easily avoided with a single #ifdef/#endif pair within
user_64bit_mode() itself.

Suggested-by: Borislav Petkov <bp@...e.de>
Signed-off-by: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Borislav Petkov <bp@...e.de>
Cc: "Michael S. Tsirkin" <mst@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: ricardo.neri@...el.com
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Paul Gortmaker <paul.gortmaker@...driver.com>
Cc: Huang Rui <ray.huang@....com>
Cc: Qiaowei Ren <qiaowei.ren@...el.com>
Cc: Shuah Khan <shuah@...nel.org>
Cc: Kees Cook <keescook@...omium.org>
Cc: Jonathan Corbet <corbet@....net>
Cc: Jiri Slaby <jslaby@...e.cz>
Cc: Dmitry Vyukov <dvyukov@...gle.com>
Cc: "Ravi V. Shankar" <ravi.v.shankar@...el.com>
Cc: Chris Metcalf <cmetcalf@...lanox.com>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Colin Ian King <colin.king@...onical.com>
Cc: Chen Yucong <slaoub@...il.com>
Cc: Adam Buchbinder <adam.buchbinder@...il.com>
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: Lorenzo Stoakes <lstoakes@...il.com>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Thomas Garnier <thgarnie@...gle.com>
Link: https://lkml.kernel.org/r/1509135945-13762-4-git-send-email-ricardo.neri-calderon@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/include/asm/ptrace.h |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/arch/x86/include/asm/ptrace.h
+++ b/arch/x86/include/asm/ptrace.h
@@ -136,9 +136,9 @@ static inline int v8086_mode(struct pt_r
 #endif
 }

-#ifdef CONFIG_X86_64
 static inline bool user_64bit_mode(struct pt_regs *regs)
 {
+#ifdef CONFIG_X86_64
 #ifndef CONFIG_PARAVIRT
 	/*
 	 * On non-paravirt systems, this is the only long mode CPL 3
@@ -149,8 +149,12 @@ static inline bool user_64bit_mode(struc
 	/* Headers are too twisted for this to go in paravirt.h. */
 	return regs->cs == __USER_CS || regs->cs == pv_info.extra_user_64bit_cs;
 #endif
+#else /* !CONFIG_X86_64 */
+	return false;
+#endif
 }

+#ifdef CONFIG_X86_64
 #define current_user_stack_pointer()	current_pt_regs()->sp
 #define compat_user_stack_pointer()	current_pt_regs()->sp
 #endif