linux-kernel - [PATCH 2/3] module: be more picky about allowing missing module versions

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Date:	Fri, 9 May 2008 16:24:21 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	linux-kernel@...r.kernel.org
Cc:	Jon Masters <jonathan@...masters.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 2/3] module: be more picky about allowing missing module versions

We allow missing __versions sections, because modprobe --force strips
it.  It makes less sense to allow sections where there's no version
for a specific symbol the module uses, so disallow that.

Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
---
 kernel/module.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff -r cf690cb1ffad kernel/module.c
--- a/kernel/module.c	Thu May 08 21:51:23 2008 +1000
+++ b/kernel/module.c	Thu May 08 21:51:48 2008 +1000
@@ -917,6 +917,10 @@ static int check_version(Elf_Shdr *sechd
 	if (!crc)
 		return 1;
 
+	/* No versions at all?  modprobe --force does this. */
+	if (versindex == 0)
+		return try_to_force_load(mod, symname) == 0;
+
 	versions = (void *) sechdrs[versindex].sh_addr;
 	num_versions = sechdrs[versindex].sh_size
 		/ sizeof(struct modversion_info);
@@ -932,8 +936,9 @@ static int check_version(Elf_Shdr *sechd
 		goto bad_version;
 	}
 
-	if (!try_to_force_load(mod, symname))
-		return 1;
+	printk(KERN_WARNING "%s: no symbol version for %s\n",
+	       mod->name, symname);
+	return 0;
 
 bad_version:
 	printk("%s: disagrees about version of symbol %s\n",
--
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