linux-kernel - [PATCH 2/2] module: workaround duplicate section names

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Message-Id: <200908262204.13395.rusty@rustcorp.com.au>
Date:	Wed, 26 Aug 2009 22:04:12 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	Helge Deller <deller@....de>
Subject: [PATCH 2/2] module: workaround duplicate section names

From: James Bottomley <James.Bottomley@...senPartnership.com>

(This patch leaves other problems, particularly the sections
 directory, but recent parisc toolchains seem to produce these
 modules and this prevents a crash and is a minimal change -- RR).

The root cause is a duplicate section name (.text); is this legal?

However, there's a problem with commit
6d76013381ed28979cd122eb4b249a88b5e384fa in that if you fail to allocate
a mod->sect_attrs (in this case it's null because of the duplication),
it still gets used without checking in add_notes_attrs()

This should fix it

Signed-off-by: James Bottomley <James.Bottomley@...e.de>
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
Tested-by: Helge Deller <deller@....de>
---

diff --git a/kernel/module.c b/kernel/module.c
index fd14114..a703c49 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2353,7 +2353,8 @@ static noinline struct module *load_module(void __user *umod,
 	if (err < 0)
 		goto unlink;
 	add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
-	add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
+	if (mod->sect_attrs)
+		add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
 
 	/* Get rid of temporary copy */
 	vfree(hdr);
--
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