linux-kernel - Re: [ 30/62] Fix modpost failures in fedora 17

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Message-ID: <20120426004131.GA8556@burratino>
Date:	Wed, 25 Apr 2012 19:41:32 -0500
From:	Jonathan Nieder <jrnieder@...il.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, "David S. Miller" <davem@...emloft.net>,
	Sam Ravnborg <sam@...nborg.org>, Michal Marek <mmarek@...e.cz>
Subject: Re: [ 30/62] Fix modpost failures in fedora 17

Greg KH wrote:

> 3.3-stable review patch.
[...]
> commit e88aa7bbbe3046a125ea1936b16bb921cc9c6349 upstream.
>
> The symbol table on x86-64 starts to have entries that have names
> like:
>
> _GLOBAL__sub_I_65535_0___mod_x86cpu_device_table
[...]
> FATAL: arch/x86/crypto/aesni-intel: sizeof(struct x86cpu_device_id)=16 is not a modulo of the size of section __mod_x86cpu_device_table=18.

I haven't tested this, but I suspect 3.0.y has the same problem ---
v3.3-rc1~66^2~12 ("modpost: use a table rather than a giant if/else
statement") just clarified the code a little and does not seem to have
gone wrong.

In other words, the conflict encountered when applying this to 3.0.y
looks like a textual and not a meaningful one.  Backport follows.

-- >8 --
From: David Miller <davem@...emloft.net>
Date: Thu, 12 Apr 2012 14:37:30 -0400

commit e88aa7bbbe3046a125ea1936b16bb921cc9c6349 upstream.

The symbol table on x86-64 starts to have entries that have names
like:

_GLOBAL__sub_I_65535_0___mod_x86cpu_device_table

They are of type STT_FUNCTION and this one had a length of 18.  This
matched the device ID validation logic and it barfed because the
length did not meet the device type's criteria.

--------------------
FATAL: arch/x86/crypto/aesni-intel: sizeof(struct x86cpu_device_id)=16 is not a modulo of the size of section __mod_x86cpu_device_table=18.
Fix definition of struct x86cpu_device_id in mod_devicetable.h
--------------------

These are some kind of compiler tool internal stuff being emitted and
not something we want to inspect in modpost's device ID table
validation code.

So skip the symbol if it is not of type STT_OBJECT.

Signed-off-by: David S. Miller <davem@...emloft.net>
Acked-by: Sam Ravnborg <sam@...nborg.org>
Signed-off-by: Michal Marek <mmarek@...e.cz>
Signed-off-by: Jonathan Nieder <jrnieder@...il.com>
---
Thanks,
Jonathan

 scripts/mod/file2alias.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
index e26e2fb462d4..f210eae9bd7e 100644
--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -905,6 +905,10 @@ void handle_moddevtable(struct module *mod, struct elf_info *info,
 	if (!sym->st_shndx || get_secindex(info, sym) >= info->num_sections)
 		return;
 
+	/* We're looking for an object */
+	if (ELF_ST_TYPE(sym->st_info) != STT_OBJECT)
+		return;
+
 	/* Handle all-NULL symbols allocated into .bss */
 	if (info->sechdrs[get_secindex(info, sym)].sh_type & SHT_NOBITS) {
 		zeros = calloc(1, sym->st_size);
-- 
1.7.10

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