Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S936577AbcJSCFU (ORCPT ); Tue, 18 Oct 2016 22:05:20 -0400 Received: from mail-pf0-f196.google.com ([209.85.192.196]:33554 "EHLO mail-pf0-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934851AbcJSCDy (ORCPT ); Tue, 18 Oct 2016 22:03:54 -0400 From: Kyle Huey X-Google-Original-From: Kyle Huey To: "Robert O'Callahan" , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , x86@kernel.org, Jeff Dike , Richard Weinberger , Andy Lutomirski , Borislav Petkov , Dmitry Safonov , Peter Zijlstra , Dave Hansen , Boris Ostrovsky , Alexander Viro , Shuah Khan , "Rafael J. Wysocki" , Len Brown Cc: linux-kernel@vger.kernel.org, user-mode-linux-devel@lists.sourceforge.net, user-mode-linux-user@lists.sourceforge.net, linux-kselftest@vger.kernel.org, linux-api@vger.kernel.org Subject: [PATCH v7 4/6] x86/syscalls/32: Wire up arch_prctl on x86-32 Date: Tue, 18 Oct 2016 19:03:31 -0700 Message-Id: <20161019020333.3766-5-khuey@kylehuey.com> X-Mailer: git-send-email 2.10.1 In-Reply-To: <20161019020333.3766-1-khuey@kylehuey.com> References: <20161019020333.3766-1-khuey@kylehuey.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3620 Lines: 114 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 ff6ef7b..804456f 100644 --- a/arch/x86/entry/syscalls/syscall_32.tbl +++ b/arch/x86/entry/syscalls/syscall_32.tbl @@ -391,3 +391,4 @@ 382 i386 pkey_free sys_pkey_free #383 i386 pkey_get sys_pkey_get #384 i386 pkey_set sys_pkey_set +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 @@ -35,6 +35,7 @@ #include #include #include +#include #include #include @@ -54,6 +55,7 @@ #include #include #include +#include void __show_regs(struct pt_regs *regs, int all) { @@ -301,3 +303,8 @@ __switch_to(struct task_struct *prev_p, struct task_struct *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 @@ -626,6 +626,13 @@ SYSCALL_DEFINE2(arch_prctl, int, code, unsigned long, 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 @@ -16,7 +16,7 @@ obj-y = bug.o bugs_$(BITS).o delay.o fault.o ldt.o \ ifeq ($(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 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 @@ -721,6 +721,8 @@ asmlinkage long compat_sys_sched_rr_get_interval(compat_pid_t pid, 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 -- 2.10.1