linux-kernel - Re: [PATCH 2/6] exec: simplify the compat syscall handling

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Date:   Mon, 15 Jun 2020 17:09:26 +0200
From:   Christoph Hellwig <hch@....de>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Christoph Hellwig <hch@....de>, Al Viro <viro@...iv.linux.org.uk>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        Parisc List <linux-parisc@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        sparclinux <sparclinux@...r.kernel.org>,
        Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/6] exec: simplify the compat syscall handling

On Mon, Jun 15, 2020 at 04:46:15PM +0200, Arnd Bergmann wrote:
> How about this one:
> 
> diff --git a/arch/x86/entry/syscall_x32.c b/arch/x86/entry/syscall_x32.c
> index 3d8d70d3896c..0ce15807cf54 100644
> --- a/arch/x86/entry/syscall_x32.c
> +++ b/arch/x86/entry/syscall_x32.c
> @@ -16,6 +16,9 @@
>  #undef __SYSCALL_X32
>  #undef __SYSCALL_COMMON
> 
> +#define __x32_sys_execve __x64_sys_execve
> +#define __x32_sys_execveat __x64_sys_execveat
> +


arch/x86/entry/syscall_x32.c:19:26: error: ‘__x64_sys_execve’ undeclared here (not in a function); did you mean ‘__x32_sys_execve’?
   19 | #define __x32_sys_execve __x64_sys_execve
      |                          ^~~~~~~~~~~~~~~~
arch/x86/entry/syscall_x32.c:22:39: note: in expansion of macro ‘__x32_sys_execve’
   22 | #define __SYSCALL_X32(nr, sym) [nr] = __x32_##sym,
      |                                       ^~~~~~
./arch/x86/include/generated/asm/syscalls_64.h:344:1: note: in expansion of macro ‘__SYSCALL_X32’
  344 | __SYSCALL_X32(520, sys_execve)
      | ^~~~~~~~~~~~~
arch/x86/entry/syscall_x32.c:20:28: error: ‘__x64_sys_execveat’ undeclared here (not in a function); did you mean ‘__x32_sys_execveat’?
   20 | #define __x32_sys_execveat __x64_sys_execveat
      |                            ^~~~~~~~~~~~~~~~~~
arch/x86/entry/syscall_x32.c:22:39: note: in expansion of macro ‘__x32_sys_execveat’
   22 | #define __SYSCALL_X32(nr, sym) [nr] = __x32_##sym,
      |                                       ^~~~~~
./arch/x86/include/generated/asm/syscalls_64.h:369:1: note: in expansion of macro ‘__SYSCALL_X32’
  369 | __SYSCALL_X32(545, sys_execveat)
      | ^~~~~~~~~~~~~
make[2]: *** [scripts/Makefile.build:281: arch/x86/entry/syscall_x32.o] Error 1
make[1]: *** [scripts/Makefile.build:497: arch/x86/entry] Error 2
make[1]: *** Waiting for unfinished jobs....
kernel/exit.o: warning: objtool: __x64_sys_exit_group()+0x14: unreachable instruction
make: *** [Makefile:1764: arch/x86] Error 2
make: *** Waiting for unfinished jobs....