linux-kernel - Re: [PATCH v2] arch: define weak abort

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Date:   Tue, 19 Dec 2017 13:55:59 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:     Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        <linux-kernel@...r.kernel.org>, Arnd Bergmann <arnd@...db.de>,
        "Alexey Brodkin" <Alexey.Brodkin@...opsys.com>,
        arcml <linux-snps-arc@...ts.infradead.org>
Subject: Re: [PATCH v2] arch: define weak abort

On Tue, 19 Dec 2017 13:39:22 -0800 Vineet Gupta <Vineet.Gupta1@...opsys.com> wrote:

> > --- a/kernel/exit.c
> > +++ b/kernel/exit.c
> > @@ -1759,3 +1759,11 @@ long kernel_wait4(pid_t upid, int __user *stat_addr, int options,
> >   	return -EFAULT;
> >   }
> >   #endif
> > +
> > +__weak void abort(void)
> > +{
> > +	BUG();
> > +
> > +	/* if that doesn't kill us, halt */
> > +	panic("Oops failed to kill thread");
> > +}
> 
> Hmm, I realize there's a small gotcha with this, when testing with a different 
> patch from Arnd. This needs an EXPORT_SYMBOL() as well !

Yup.  This?

From: Andrew Morton <akpm@...ux-foundation.org>
Subject: kernel/exit.c: export abort() to modules

gcc -fisolate-erroneous-paths-dereference can generate calls to abort()
from modular code too.

Reported-by: Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc: Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: "Alexey Brodkin" <Alexey.Brodkin@...opsys.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 kernel/exit.c |    1 +
 1 file changed, 1 insertion(+)

diff -puN kernel/exit.c~a kernel/exit.c
--- a/kernel/exit.c~a
+++ a/kernel/exit.c
@@ -1763,3 +1763,4 @@ __weak void abort(void)
 	/* if that doesn't kill us, halt */
 	panic("Oops failed to kill thread");
 }
+EXPORT_SYMBOL(abort);
_