linux-kernel - Re: kernel segv with 2.6.31-rc6 ?

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Message-ID: <20090820115830.123490@gmx.net>
Date:	Thu, 20 Aug 2009 13:58:30 +0200
From:	"Helge Deller" <deller@....de>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	linux-kernel@...r.kernel.org, roland@...hat.com,
	linux-parisc@...r.kernel.org
Subject: Re: kernel segv with 2.6.31-rc6 ?

> 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>


Thanks!
I tested it, and it does at least fix the kernel crash.

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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