This is a note to let you know that I've just added the patch titled

ptrace,x86: Make user_64bit_mode() available to 32-bit builds

to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: ptrace-x86-make-user_64bit_mode-available-to-32-bit-builds.patch and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From e27c310af5c05cf876d9cad006928076c27f54d4 Mon Sep 17 00:00:00 2001

From: Ricardo Neri ricardo.neri-calderon@linux.intel.com Date: Fri, 27 Oct 2017 13:25:30 -0700 Subject: ptrace,x86: Make user_64bit_mode() available to 32-bit builds

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

Patches currently in stable-queue which might be from ricardo.neri-calderon@linux.intel.com are

queue-4.14/x86-boot-relocate-definition-of-the-initial-state-of-cr0.patch queue-4.14/ptrace-x86-make-user_64bit_mode-available-to-32-bit-builds.patch queue-4.14/x86-mm-relocate-page-fault-error-codes-to-traps.h.patch