linux-kernel - Re: mmotm 2012-09-06-16-46 uploaded (fs/binfmt

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Message-Id: <20120911151739.cb5f2f4b.akpm@linux-foundation.org>
Date:	Tue, 11 Sep 2012 15:17:39 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Randy Dunlap <rdunlap@...otime.net>
Cc:	linux-kernel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org, linux-next@...r.kernel.org,
	Alex Kelly <alex.page.kelly@...il.com>
Subject: Re: mmotm 2012-09-06-16-46 uploaded (fs/binfmt_aout)

On Fri, 07 Sep 2012 16:45:11 -0700
Randy Dunlap <rdunlap@...otime.net> wrote:

> On 09/06/2012 04:47 PM, akpm@...ux-foundation.org wrote:
> 
> > The mm-of-the-moment snapshot 2012-09-06-16-46 has been uploaded to
> > 
> >    http://www.ozlabs.org/~akpm/mmotm/
> > 
> 
> 
> when CONFIG_COREDUMP is not enabled:
> 
> ERROR: "dump_seek" [fs/binfmt_aout.ko] undefined!
> ERROR: "dump_write" [fs/binfmt_aout.ko] undefined!

Thanks.  I guess we make aout_core_dump() disappear if
CONFIG_COREDUMP=n.

--- a/fs/binfmt_aout.c~coredump-make-core-dump-functionality-optional-fix-fix
+++ a/fs/binfmt_aout.c
@@ -32,31 +32,8 @@
 
 static int load_aout_binary(struct linux_binprm *, struct pt_regs * regs);
 static int load_aout_library(struct file*);
-static int aout_core_dump(struct coredump_params *cprm);
-
-static struct linux_binfmt aout_format = {
-	.module		= THIS_MODULE,
-	.load_binary	= load_aout_binary,
-	.load_shlib	= load_aout_library,
-	.core_dump	= aout_core_dump,
-	.min_coredump	= PAGE_SIZE
-};
-
-#define BAD_ADDR(x)	((unsigned long)(x) >= TASK_SIZE)
-
-static int set_brk(unsigned long start, unsigned long end)
-{
-	start = PAGE_ALIGN(start);
-	end = PAGE_ALIGN(end);
-	if (end > start) {
-		unsigned long addr;
-		addr = vm_brk(start, end - start);
-		if (BAD_ADDR(addr))
-			return addr;
-	}
-	return 0;
-}
 
+#ifdef CONFIG_COREDUMP
 /*
  * Routine writes a core dump image in the current directory.
  * Currently only a stub-function.
@@ -66,7 +43,6 @@ static int set_brk(unsigned long start, 
  * field, which also makes sure the core-dumps won't be recursive if the
  * dumping of the process results in another error..
  */
-
 static int aout_core_dump(struct coredump_params *cprm)
 {
 	struct file *file = cprm->file;
@@ -135,6 +111,32 @@ end_coredump:
 	set_fs(fs);
 	return has_dumped;
 }
+#else
+#define aout_core_dump NULL
+#endif
+
+static struct linux_binfmt aout_format = {
+	.module		= THIS_MODULE,
+	.load_binary	= load_aout_binary,
+	.load_shlib	= load_aout_library,
+	.core_dump	= aout_core_dump,
+	.min_coredump	= PAGE_SIZE
+};
+
+#define BAD_ADDR(x)	((unsigned long)(x) >= TASK_SIZE)
+
+static int set_brk(unsigned long start, unsigned long end)
+{
+	start = PAGE_ALIGN(start);
+	end = PAGE_ALIGN(end);
+	if (end > start) {
+		unsigned long addr;
+		addr = vm_brk(start, end - start);
+		if (BAD_ADDR(addr))
+			return addr;
+	}
+	return 0;
+}
 
 /*
  * create_aout_tables() parses the env- and arg-strings in new user
_

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