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

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Date:   Mon, 15 Jun 2020 16:46:15 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Christoph Hellwig <hch@....de>
Cc:     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 4:43 PM Christoph Hellwig <hch@....de> wrote:
>
> On Mon, Jun 15, 2020 at 04:40:28PM +0200, Arnd Bergmann wrote:
> > > ld: arch/x86/entry/syscall_x32.o:(.rodata+0x1040): undefined reference to
> > > `__x32_sys_execve'
> > > ld: arch/x86/entry/syscall_x32.o:(.rodata+0x1108): undefined reference to
> > > `__x32_sys_execveat'
> > > make: *** [Makefile:1139: vmlinux] Error 1
> >
> > Ah, I see: it's marked x32-only, so arch/x86/entry/syscall_x32.c
> > uses the __x32 prefix instead of the __x64 one. Marking it 'common'
> > instead would make it work, but also create an extra entry point
> > for native processes, something that commit
> > 6365b842aae4 ("x86/syscalls: Split the x32 syscalls into their own table")
> > was trying to avoid.
>
> Marking it common also doesn't compile at all because __NR_execve
> and __NR_execveat get redefined in unistd_64.h.  I then tried to rename
> the x32 versions, which failed in yet another way.  At that point I gave
> up instead of digging myself into a deeper hole..

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
+
 #define __SYSCALL_X32(nr, sym) [nr] = __x32_##sym,
 #define __SYSCALL_COMMON(nr, sym) [nr] = __x64_##sym,

Still ugly, but much simpler and more localized (if it works).

        Arnd