linux-kernel - Re: [PATCH, RFC 43/62] syscall/x86: Wire up a system call for MKTME encryption keys

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Date:   Wed, 29 May 2019 10:21:37 +0300
From:   Mike Rapoport <rppt@...ux.ibm.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...capital.net>,
        David Howells <dhowells@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Kai Huang <kai.huang@...ux.intel.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Alison Schofield <alison.schofield@...el.com>,
        linux-mm@...ck.org, kvm@...r.kernel.org, keyrings@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH, RFC 43/62] syscall/x86: Wire up a system call for MKTME
 encryption keys

On Wed, May 08, 2019 at 05:44:03PM +0300, Kirill A. Shutemov wrote:
> From: Alison Schofield <alison.schofield@...el.com>
> 
> encrypt_mprotect() is a new system call to support memory encryption.
> 
> It takes the same parameters as legacy mprotect, plus an additional
> key serial number that is mapped to an encryption keyid.

Shouldn't this patch be after the encrypt_mprotect() is added?
 
> Signed-off-by: Alison Schofield <alison.schofield@...el.com>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> ---
>  arch/x86/entry/syscalls/syscall_32.tbl | 1 +
>  arch/x86/entry/syscalls/syscall_64.tbl | 1 +
>  include/linux/syscalls.h               | 2 ++
>  include/uapi/asm-generic/unistd.h      | 4 +++-
>  kernel/sys_ni.c                        | 2 ++
>  5 files changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl
> index 1f9607ed087c..dbcd4c28d743 100644
> --- a/arch/x86/entry/syscalls/syscall_32.tbl
> +++ b/arch/x86/entry/syscalls/syscall_32.tbl
> @@ -433,3 +433,4 @@
>  425	i386	io_uring_setup		sys_io_uring_setup		__ia32_sys_io_uring_setup
>  426	i386	io_uring_enter		sys_io_uring_enter		__ia32_sys_io_uring_enter
>  427	i386	io_uring_register	sys_io_uring_register		__ia32_sys_io_uring_register
> +428	i386	encrypt_mprotect	sys_encrypt_mprotect		__ia32_sys_encrypt_mprotect
> diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl
> index 92ee0b4378d4..d01bd132e9ee 100644
> --- a/arch/x86/entry/syscalls/syscall_64.tbl
> +++ b/arch/x86/entry/syscalls/syscall_64.tbl
> @@ -349,6 +349,7 @@
>  425	common	io_uring_setup		__x64_sys_io_uring_setup
>  426	common	io_uring_enter		__x64_sys_io_uring_enter
>  427	common	io_uring_register	__x64_sys_io_uring_register
> +428	common	encrypt_mprotect	__x64_sys_encrypt_mprotect
> 
>  #
>  # x32-specific system call numbers start at 512 to avoid cache impact
> diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
> index e446806a561f..38a2d7b95397 100644
> --- a/include/linux/syscalls.h
> +++ b/include/linux/syscalls.h
> @@ -988,6 +988,8 @@ asmlinkage long sys_rseq(struct rseq __user *rseq, uint32_t rseq_len,
>  asmlinkage long sys_pidfd_send_signal(int pidfd, int sig,
>  				       siginfo_t __user *info,
>  				       unsigned int flags);
> +asmlinkage long sys_encrypt_mprotect(unsigned long start, size_t len,
> +				     unsigned long prot, key_serial_t serial);
> 
>  /*
>   * Architecture-specific system calls
> diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
> index dee7292e1df6..86f942f54b1b 100644
> --- a/include/uapi/asm-generic/unistd.h
> +++ b/include/uapi/asm-generic/unistd.h
> @@ -832,9 +832,11 @@ __SYSCALL(__NR_io_uring_setup, sys_io_uring_setup)
>  __SYSCALL(__NR_io_uring_enter, sys_io_uring_enter)
>  #define __NR_io_uring_register 427
>  __SYSCALL(__NR_io_uring_register, sys_io_uring_register)
> +#define __NR_encrypt_mprotect 428
> +__SYSCALL(__NR_encrypt_mprotect, sys_encrypt_mprotect)
> 
>  #undef __NR_syscalls
> -#define __NR_syscalls 428
> +#define __NR_syscalls 429
> 
>  /*
>   * 32 bit systems traditionally used different
> diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
> index d21f4befaea4..80da8d9ac8b1 100644
> --- a/kernel/sys_ni.c
> +++ b/kernel/sys_ni.c
> @@ -350,6 +350,8 @@ COND_SYSCALL(pkey_mprotect);
>  COND_SYSCALL(pkey_alloc);
>  COND_SYSCALL(pkey_free);
> 
> +/* multi-key total memory encryption keys */
> +COND_SYSCALL(encrypt_mprotect);
> 
>  /*
>   * Architecture specific weak syscall entries.
> -- 
> 2.20.1
> 

-- 
Sincerely yours,
Mike.