From patchwork Thu Nov 17 02:06:07 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kyle Huey X-Patchwork-Id: 9433405 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 50DE560469 for ; Thu, 17 Nov 2016 02:08:25 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 376D729030 for ; Thu, 17 Nov 2016 02:08:25 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 27BC3291E6; Thu, 17 Nov 2016 02:08:25 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.3 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI, RCVD_IN_SORBS_SPAM, T_DKIM_INVALID autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 56FC829030 for ; Thu, 17 Nov 2016 02:08:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935112AbcKQCIM (ORCPT ); Wed, 16 Nov 2016 21:08:12 -0500 Received: from mail-pg0-f66.google.com ([74.125.83.66]:36286 "EHLO mail-pg0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932688AbcKQCGd (ORCPT ); Wed, 16 Nov 2016 21:06:33 -0500 Received: by mail-pg0-f66.google.com with SMTP id x23so16161687pgx.3 for ; Wed, 16 Nov 2016 18:06:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kylehuey.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=mZZSOYzGt3DtUke4wSA6kXUkAPSbCr4sVmOfhOAvT7M=; b=ZS2XEJhZH6U4m5SYtzF+XFlu3sX0XQos3EWzzF/wpQo3DXr9OORamM3graGHjfICwv SqQZDD4ZMwzHXQY0h7AMLkL5iCG0mD9soE5pLkEMS5zre5RF/w9bRYsPEpBdcqHRavHI LlUgvJNJeQfxO7uVyQ3P4jpbtU+N5eNFANDZM7v7inKHNE25QvuzkuaiRGYvMl1aP+0g 9taKIdNtVEkik5nISX0Mx62WlJNcbSp3LlbEwyH1QIVdVNzmvK12Z8HjNBswOMn0KzDv CEdY6OkDBvQYX+EMdIG3s23IUogecw2uv9gaelazrjkjLiBDuRHpQTmEAyzLcieB7IoY 5/2g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=mZZSOYzGt3DtUke4wSA6kXUkAPSbCr4sVmOfhOAvT7M=; b=GJ3uu3sSAYjyJO0i5mlGeM2yU87wUY5xT1MTvUtxOFOH4DsfA8irV0KmN9cwW9kz1B I8d10r0OsGHNahsSaEdgO6Vwsn5u50U/oPBw44vb+IJ5UPup8/uTspKNBhxR/x2dOCWL RKK/Fvkwv51wG3Nh6LB5DSH84xx4EhEbtBmv3g0NIzXSlSGv4YHNKn0hpaV3bXY5/8sI GJXQDWustEVocrL737jmNqqgKgURTfnQANBbhMNgFfz0rjChKNF106nevSO0noqBzoim ZR3/W3tTgX+Pt5rINLljd99lc3ZikMLsN9oW4MiedkI9ZibiW5JlJckT7JhcxmnUd+rY u6KA== X-Gm-Message-State: ABUngvf88S/fOJXKyAe2PfKXfoZICMalP2t0hmClR6LJBu0fogdilmYra6GRGQ4iQ+/IYg== X-Received: by 10.99.226.83 with SMTP id y19mr1681630pgj.147.1479348392526; Wed, 16 Nov 2016 18:06:32 -0800 (PST) Received: from minbar.hsd1.ca.comcast.net (c-73-162-102-141.hsd1.ca.comcast.net. [73.162.102.141]) by smtp.gmail.com with ESMTPSA id y20sm805793pfj.26.2016.11.16.18.06.30 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 16 Nov 2016 18:06:31 -0800 (PST) From: Kyle Huey X-Google-Original-From: Kyle Huey To: Robert O'Callahan , Thomas Gleixner , Andy Lutomirski , Ingo Molnar , "H. Peter Anvin" , x86@kernel.org, Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Jeff Dike , Richard Weinberger , Alexander Viro , Shuah Khan , Dave Hansen , Borislav Petkov , Peter Zijlstra , Boris Ostrovsky , Len Brown , "Rafael J. Wysocki" , Dmitry Safonov , David Matlack , Nadav Amit Cc: linux-kernel@vger.kernel.org, user-mode-linux-devel@lists.sourceforge.net, user-mode-linux-user@lists.sourceforge.net, linux-fsdevel@vger.kernel.org, linux-kselftest@vger.kernel.org, kvm@vger.kernel.org Subject: [PATCH v12 4/7] x86/syscalls/32: Wire up arch_prctl on x86-32 Date: Wed, 16 Nov 2016 18:06:07 -0800 Message-Id: <20161117020610.5302-5-khuey@kylehuey.com> X-Mailer: git-send-email 2.10.2 In-Reply-To: <20161117020610.5302-1-khuey@kylehuey.com> References: <20161117020610.5302-1-khuey@kylehuey.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Hook up arch_prctl to call do_arch_prctl() on x86-32, and in 32 bit compat mode on x86-64. This allows us to have arch_prctls that are not specific to 64 bits. On UML, simply stub out this syscall. Signed-off-by: Kyle Huey --- arch/x86/entry/syscalls/syscall_32.tbl | 1 + arch/x86/kernel/process_32.c | 7 +++++++ arch/x86/kernel/process_64.c | 7 +++++++ arch/x86/um/Makefile | 2 +- arch/x86/um/syscalls_32.c | 7 +++++++ include/linux/compat.h | 2 ++ 6 files changed, 25 insertions(+), 1 deletion(-) create mode 100644 arch/x86/um/syscalls_32.c diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl index 2b36185..d78c6b5 100644 --- a/arch/x86/entry/syscalls/syscall_32.tbl +++ b/arch/x86/entry/syscalls/syscall_32.tbl @@ -384,8 +384,9 @@ 375 i386 membarrier sys_membarrier 376 i386 mlock2 sys_mlock2 377 i386 copy_file_range sys_copy_file_range 378 i386 preadv2 sys_preadv2 compat_sys_preadv2 379 i386 pwritev2 sys_pwritev2 compat_sys_pwritev2 380 i386 pkey_mprotect sys_pkey_mprotect 381 i386 pkey_alloc sys_pkey_alloc 382 i386 pkey_free sys_pkey_free +385 i386 arch_prctl sys_arch_prctl compat_sys_arch_prctl diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c index bd7be8e..95d3adc 100644 --- a/arch/x86/kernel/process_32.c +++ b/arch/x86/kernel/process_32.c @@ -30,16 +30,17 @@ #include #include #include #include #include #include #include #include +#include #include #include #include #include #include #ifdef CONFIG_MATH_EMULATION #include @@ -49,16 +50,17 @@ #include #include #include #include #include #include #include +#include void __show_regs(struct pt_regs *regs, int all) { unsigned long cr0 = 0L, cr2 = 0L, cr3 = 0L, cr4 = 0L; unsigned long d0, d1, d2, d3, d6, d7; unsigned long sp; unsigned short ss, gs; @@ -296,8 +298,13 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p) lazy_load_gs(next->gs); switch_fpu_finish(next_fpu, fpu_switch); this_cpu_write(current_task, next_p); return prev_p; } + +SYSCALL_DEFINE2(arch_prctl, int, code, unsigned long, arg2) +{ + return do_arch_prctl_common(current, code, arg2); +} diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index bf75d26..3a2a84d 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -621,12 +621,19 @@ SYSCALL_DEFINE2(arch_prctl, int, code, unsigned long, arg2) ret = do_arch_prctl_64(current, code, arg2); if (ret == -EINVAL) ret = do_arch_prctl_common(current, code, arg2); return ret; } +#ifdef CONFIG_IA32_EMULATION +COMPAT_SYSCALL_DEFINE2(arch_prctl, int, code, unsigned long, arg2) +{ + return do_arch_prctl_common(current, code, arg2); +} +#endif + unsigned long KSTK_ESP(struct task_struct *task) { return task_pt_regs(task)->sp; } diff --git a/arch/x86/um/Makefile b/arch/x86/um/Makefile index e7e7055..69f0827 100644 --- a/arch/x86/um/Makefile +++ b/arch/x86/um/Makefile @@ -11,17 +11,17 @@ endif obj-y = bug.o bugs_$(BITS).o delay.o fault.o ldt.o \ ptrace_$(BITS).o ptrace_user.o setjmp_$(BITS).o signal.o \ stub_$(BITS).o stub_segv.o \ sys_call_table_$(BITS).o sysrq_$(BITS).o tls_$(BITS).o \ mem_$(BITS).o subarch.o os-$(OS)/ ifeq ($(CONFIG_X86_32),y) -obj-y += checksum_32.o +obj-y += checksum_32.o syscalls_32.o obj-$(CONFIG_ELF_CORE) += elfcore.o subarch-y = ../lib/string_32.o ../lib/atomic64_32.o ../lib/atomic64_cx8_32.o subarch-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += ../lib/rwsem.o else obj-y += syscalls_64.o vdso/ diff --git a/arch/x86/um/syscalls_32.c b/arch/x86/um/syscalls_32.c new file mode 100644 index 0000000..ccf0598 --- /dev/null +++ b/arch/x86/um/syscalls_32.c @@ -0,0 +1,7 @@ +#include +#include + +SYSCALL_DEFINE2(arch_prctl, int, code, unsigned long, arg2) +{ + return -EINVAL; +} diff --git a/include/linux/compat.h b/include/linux/compat.h index 6360939..500cdb3 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -716,16 +716,18 @@ int __compat_save_altstack(compat_stack_t __user *, unsigned long); } while (0); asmlinkage long compat_sys_sched_rr_get_interval(compat_pid_t pid, struct compat_timespec __user *interval); asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32, int, const char __user *); +asmlinkage long compat_sys_arch_prctl(int, unsigned long); + /* * For most but not all architectures, "am I in a compat syscall?" and * "am I a compat task?" are the same question. For architectures on which * they aren't the same question, arch code can override in_compat_syscall. */ #ifndef in_compat_syscall static inline bool in_compat_syscall(void) { return is_compat_task(); }