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Re: [PATCH] x86/asm/64: do not clear high 32 bits of syscall number when CONFIG_X86_X32=y

From "Dmitry V. Levin" <ldv@altlinux.org>
Newsgroups linux.kernel
Subject Re: [PATCH] x86/asm/64: do not clear high 32 bits of syscall number when CONFIG_X86_X32=y
Date 2017-09-14 22:30 +0200
Message-ID <upIVP-1fS-17@gated-at.bofh.it> (permalink)
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On Thu, Sep 14, 2017 at 07:40:43PM +0000, Eugene Syromyatnikov wrote:
> On Wed, Sep 13, 2017 at 4:49 PM, Oleg Nesterov <oleg@redhat.com> wrote:
> > IOW, why do we want to silently ignore the upper bits in $rax ?
> 
> By the way, they are ignored elsewhere, in audit[1] or seccomp[2], for example.
> 
> [1] include/linux/audit.h
> [2] include/uapi/linux/seccomp.h, definition of struct seccomp_data

Yes, unfortunately, they are ignored later, but that is another story.


-- 
ldv

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[PATCH] x86/asm/64: do not clear high 32 bits of syscall number when  CONFIG_X86_X32=y "Dmitry V. Levin" <ldv@altlinux.org> - 2017-09-13 01:00 +0200
  Re: [PATCH] x86/asm/64: do not clear high 32 bits of syscall number  when CONFIG_X86_X32=y Oleg Nesterov <oleg@redhat.com> - 2017-09-13 18:50 +0200
    Re: [PATCH] x86/asm/64: do not clear high 32 bits of syscall number  when CONFIG_X86_X32=y Eugene Syromyatnikov <evgsyr@gmail.com> - 2017-09-14 21:50 +0200
      Re: [PATCH] x86/asm/64: do not clear high 32 bits of syscall number  when CONFIG_X86_X32=y "Dmitry V. Levin" <ldv@altlinux.org> - 2017-09-14 22:30 +0200
    Re: [PATCH] x86/asm/64: do not clear high 32 bits of syscall number  when CONFIG_X86_X32=y "Dmitry V. Levin" <ldv@altlinux.org> - 2017-09-14 22:30 +0200
      Re: [PATCH] x86/asm/64: do not clear high 32 bits of syscall number  when CONFIG_X86_X32=y Oleg Nesterov <oleg@redhat.com> - 2017-09-15 18:20 +0200
  Re: [PATCH] x86/asm/64: do not clear high 32 bits of syscall number  when CONFIG_X86_X32=y Andy Lutomirski <luto@kernel.org> - 2017-09-14 23:10 +0200
    Re: [PATCH] x86/asm/64: do not clear high 32 bits of syscall number  when CONFIG_X86_X32=y "Dmitry V. Levin" <ldv@altlinux.org> - 2017-09-14 23:40 +0200
      Re: [PATCH] x86/asm/64: do not clear high 32 bits of syscall number  when CONFIG_X86_X32=y Andy Lutomirski <luto@kernel.org> - 2017-09-14 23:50 +0200
        Re: [PATCH] x86/asm/64: do not clear high 32 bits of syscall number  when CONFIG_X86_X32=y Ingo Molnar <mingo@kernel.org> - 2017-09-15 07:40 +0200
          Re: [PATCH] x86/asm/64: do not clear high 32 bits of syscall number when CONFIG_X86_X32=y hpa@zytor.com - 2017-09-15 08:00 +0200
            Re: [PATCH] x86/asm/64: do not clear high 32 bits of syscall number  when CONFIG_X86_X32=y "Dmitry V. Levin" <ldv@altlinux.org> - 2017-09-17 18:50 +0200
          Re: [PATCH] x86/asm/64: do not clear high 32 bits of syscall number when CONFIG_X86_X32=y hpa@zytor.com - 2017-09-15 08:00 +0200

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