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    Subject[tip:x86/process] x86/syscalls/32: Wire up arch_prctl on x86-32
    Commit-ID:  79170fda313ed5be2394f87aa2a00d597f8ed4a1
    Gitweb: http://git.kernel.org/tip/79170fda313ed5be2394f87aa2a00d597f8ed4a1
    Author: Kyle Huey <me@kylehuey.com>
    AuthorDate: Mon, 20 Mar 2017 01:16:24 -0700
    Committer: Thomas Gleixner <tglx@linutronix.de>
    CommitDate: Mon, 20 Mar 2017 16:10:33 +0100

    x86/syscalls/32: Wire up arch_prctl on x86-32

    Hook up arch_prctl to call do_arch_prctl() on x86-32, and in 32 bit compat
    mode on x86-64. This allows to have arch_prctls that are not specific to 64
    bits.

    On UML, simply stub out this syscall.

    Signed-off-by: Kyle Huey <khuey@kylehuey.com>
    Cc: Grzegorz Andrejczuk <grzegorz.andrejczuk@intel.com>
    Cc: kvm@vger.kernel.org
    Cc: Radim Krčmář <rkrcmar@redhat.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Dave Hansen <dave.hansen@linux.intel.com>
    Cc: Andi Kleen <andi@firstfloor.org>
    Cc: linux-kselftest@vger.kernel.org
    Cc: Nadav Amit <nadav.amit@gmail.com>
    Cc: Robert O'Callahan <robert@ocallahan.org>
    Cc: Richard Weinberger <richard@nod.at>
    Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
    Cc: Borislav Petkov <bp@suse.de>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Len Brown <len.brown@intel.com>
    Cc: Shuah Khan <shuah@kernel.org>
    Cc: user-mode-linux-devel@lists.sourceforge.net
    Cc: Jeff Dike <jdike@addtoit.com>
    Cc: Alexander Viro <viro@zeniv.linux.org.uk>
    Cc: user-mode-linux-user@lists.sourceforge.net
    Cc: David Matlack <dmatlack@google.com>
    Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
    Cc: Dmitry Safonov <dsafonov@virtuozzo.com>
    Cc: linux-fsdevel@vger.kernel.org
    Cc: Paolo Bonzini <pbonzini@redhat.com>
    Link: http://lkml.kernel.org/r/20170320081628.18952-7-khuey@kylehuey.com
    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

    ---
    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(-)

    diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl
    index 9ba050f..0af59fa 100644
    --- a/arch/x86/entry/syscalls/syscall_32.tbl
    +++ b/arch/x86/entry/syscalls/syscall_32.tbl
    @@ -390,3 +390,4 @@
    381 i386 pkey_alloc sys_pkey_alloc
    382 i386 pkey_free sys_pkey_free
    383 i386 statx sys_statx
    +384 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 4c818f8..ff40e74 100644
    --- a/arch/x86/kernel/process_32.c
    +++ b/arch/x86/kernel/process_32.c
    @@ -37,6 +37,7 @@
    #include <linux/uaccess.h>
    #include <linux/io.h>
    #include <linux/kdebug.h>
    +#include <linux/syscalls.h>

    #include <asm/pgtable.h>
    #include <asm/ldt.h>
    @@ -56,6 +57,7 @@
    #include <asm/switch_to.h>
    #include <asm/vm86.h>
    #include <asm/intel_rdt.h>
    +#include <asm/proto.h>

    void __show_regs(struct pt_regs *regs, int all)
    {
    @@ -304,3 +306,8 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)

    return prev_p;
    }
    +
    +SYSCALL_DEFINE2(arch_prctl, int, option, unsigned long, arg2)
    +{
    + return do_arch_prctl_common(current, option, arg2);
    +}
    diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
    index d81b0a6..ea1a618 100644
    --- a/arch/x86/kernel/process_64.c
    +++ b/arch/x86/kernel/process_64.c
    @@ -635,6 +635,13 @@ SYSCALL_DEFINE2(arch_prctl, int, option, unsigned long, arg2)
    return ret;
    }

    +#ifdef CONFIG_IA32_EMULATION
    +COMPAT_SYSCALL_DEFINE2(arch_prctl, int, option, unsigned long, arg2)
    +{
    + return do_arch_prctl_common(current, option, 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..627d688
    --- /dev/null
    +++ b/arch/x86/um/syscalls_32.c
    @@ -0,0 +1,7 @@
    +#include <linux/syscalls.h>
    +#include <os.h>
    +
    +SYSCALL_DEFINE2(arch_prctl, int, option, unsigned long, arg2)
    +{
    + return -EINVAL;
    +}
    diff --git a/include/linux/compat.h b/include/linux/compat.h
    index aef47be..af9dbc4 100644
    --- a/include/linux/compat.h
    +++ b/include/linux/compat.h
    @@ -723,6 +723,8 @@ 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 option, unsigned long arg2);
    +
    /*
    * 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
    \
     
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