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[73.162.102.141]) by smtp.gmail.com with ESMTPSA id u17sm38188144pfi.1.2016.10.31.18.38.29 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 31 Oct 2016 18:38:30 -0700 (PDT) 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 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 v8 4/7] x86/syscalls/32: Wire up arch_prctl on x86-32 Date: Mon, 31 Oct 2016 18:37:46 -0700 Message-Id: <20161101013749.4003-5-khuey@kylehuey.com> X-Mailer: git-send-email 2.10.2 In-Reply-To: <20161101013749.4003-1-khuey@kylehuey.com> References: <20161101013749.4003-1-khuey@kylehuey.com> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@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(); }