linux-kernel - Re: [PATCH 2/2] ipc: fix sparc64 ipc() wrapper

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Date:   Sat, 7 Sep 2019 21:49:53 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Arnd Bergmann <arnd@...db.de>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Deepa Dinamani <deepa.kernel@...il.com>,
        Christian Brauner <christian@...uner.io>,
        Manfred Spraul <manfred@...orfullife.com>,
        Davidlohr Bueso <dave@...olabs.net>
Cc:     linux-arch <linux-arch@...r.kernel.org>,
        y2038 Mailman List <y2038@...ts.linaro.org>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Matt Turner <mattst88@...il.com>,
        "# 3.4.x" <stable@...r.kernel.org>,
        sparclinux <sparclinux@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        Anatolij Gustschin <agust@...x.de>
Subject: Re: [PATCH 2/2] ipc: fix sparc64 ipc() wrapper

On Thu, Sep 5, 2019 at 5:24 PM Arnd Bergmann <arnd@...db.de> wrote:

> diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c
> index ccc88926bc00..5ad0494df367 100644
> --- a/arch/sparc/kernel/sys_sparc_64.c
> +++ b/arch/sparc/kernel/sys_sparc_64.c
> @@ -340,21 +340,21 @@ SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second
>         if (call <= SEMTIMEDOP) {
>                 switch (call) {
>                 case SEMOP:
> -                       err = sys_semtimedop(first, ptr,
> -                                            (unsigned int)second, NULL);
> +                       err = ksys_semtimedop(first, ptr,
> +                                             (unsigned int)second, NULL);
>                         goto out;

The zero-day bot found a link error in sparc64 allnoconfig:

   arch/sparc/kernel/sys_sparc_64.o: In function `__se_sys_sparc_ipc':
>> sys_sparc_64.c:(.text+0x724): undefined reference to `ksys_semtimedop'
>> sys_sparc_64.c:(.text+0x76c): undefined reference to `ksys_old_msgctl'
>> sys_sparc_64.c:(.text+0x7a8): undefined reference to `ksys_semget'
>> sys_sparc_64.c:(.text+0x7c8): undefined reference to `ksys_old_semctl'
>> sys_sparc_64.c:(.text+0x7e4): undefined reference to `ksys_msgsnd'
>> sys_sparc_64.c:(.text+0x7fc): undefined reference to `ksys_shmget'
>> sys_sparc_64.c:(.text+0x808): undefined reference to `ksys_shmdt'
   sys_sparc_64.c:(.text+0x828): undefined reference to `ksys_semtimedop'
>> sys_sparc_64.c:(.text+0x844): undefined reference to `ksys_old_shmctl'
>> sys_sparc_64.c:(.text+0x858): undefined reference to `ksys_msgget'
>> sys_sparc_64.c:(.text+0x86c): undefined reference to `ksys_msgrcv'

I've added this hunk to my patch and plan to send both fixes to Linus
in the next few days, after I get a positive report from the bot as well:

--- a/arch/sparc/kernel/sys_sparc_64.c
+++ b/arch/sparc/kernel/sys_sparc_64.c
@@ -336,6 +336,9 @@ SYSCALL_DEFINE6(sparc_ipc, unsigned int, call,
int, first, unsigned long, second
 {
        long err;

+       if (!IS_ENABLED(CONFIG_SYSVIPC))
+               return -ENOSYS;
+
        /* No need for backward compatibility. We can start fresh... */

        if (call <= SEMTIMEDOP) {
                switch (call) {