Stack overflow i guess while insmod Post: 302523640

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Operating Systems Linux Ubuntu Stack overflow i guess while insmod Post 302523640 by sunilsukumar4u on Thursday 19th of May 2011 08:59:19 AM

05-19-2011

Registered User

Stack overflow i guess while insmod

I have built kernel 2.6.35 on my Ubuntu system with some specific requirement. I also built some app defined module with the same kernel. I booted up the built version and I find it did not work properly as there is some gui and other modules missing problem. But the system booted up and I did a insmod app.ko. I faced a crash. I found out that it is a stack problem. A caller function in the APP is passing address of two local variable. like int a, b; add (&a, &b); I checked the values of &a and &b before passing and it remained non-null but when i receive the same in the calling function, both the &a, &b are NULL or some garbage value. I increased the stack size but nothing happened. When i skipped the function call, I could see that many allocation of memory has also failed. So I think it should be memory problem. Is there anything I should be checking for gcc option to define the stack or check for stack overflow. Any hints on this could help me a lot. Thanks in advance. I just made some abstract examples since the original code section takes lot of time to explain. It could be helpful if some one give me hints to proceed.

Code:

main()
    {

    struct DMAINFO* pDmaInfo;
    struct DESC* pDesc;
            /*  printk("The function aruguments are Desc = %p and DmaInfo %p", &pDesc, &pDmaInfo); */

    Create_DMA(&pDesc, &pDmaInfo);
    }


void Create_DMA(**ppDesc, **ppDmaInfor)
    {
    printk("The function aruguments are Desc = %p and DmaInfo %p", ppDesc, ppDmaInfo);
    }

The printk statement inside create_DMA gives me NULL values, but the
same print statement in the main function before the create_DMA call has
some values. I am really confused and any sort of useful advice could help me a lot.

Last edited by radoulov; 05-19-2011 at 10:17 AM.. Reason: Code tags.

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LEARN ABOUT SUNOS

depmod.d

DEPMOD.D(5)							     depmod.d							       DEPMOD.D(5)

NAME

       depmod.d - Configuration directory for depmod

SYNOPSIS

       /usr/lib/depmod.d/*.conf

       /etc/depmod.d/*.conf

       /run/depmod.d/*.conf

DESCRIPTION

       The order in which modules are processed by the depmod command can be altered on a global or per-module basis. This is typically useful in
       cases where built-in kernel modules are complemented by custom built versions of the same and the user wishes to affect the priority of
       processing in order to override the module version supplied by the kernel.

       The format of files under depmod.d is simple: one command per line, with blank lines and lines starting with '#' ignored (useful for adding
       comments). A '' at the end of a line causes it to continue on the next line, which makes the files a bit neater.

COMMANDS

       search subdirectory...
	   This allows you to specify the order in which /lib/modules (or other configured module location) subdirectories will be processed by
	   depmod. Directories are listed in order, with the highest priority given to the first listed directory and the lowest priority given to
	   the last directory listed. The special keyword built-in refers to the standard module directories installed by the kernel.

	   By default, depmod will give a higher priority to a directory with the name updates using this built-in search string: "updates
	   built-in" but more complex arrangements are possible and are used in several popular distributions.

       override modulename kernelversion modulesubdirectory
	   This command allows you to override which version of a specific module will be used when more than one module sharing the same name is
	   processed by the depmod command. It is possible to specify one kernel or all kernels using the * wildcard.  modulesubdirectory is the
	   name of the subdirectory under /lib/modules (or other module location) where the target module is installed.

	   For example, it is possible to override the priority of an updated test module called kmod by specifying the following command:
	   "override kmod * extra". This will ensure that any matching module name installed under the extra subdirectory within /lib/modules (or
	   other module location) will take priority over any likenamed module already provided by the kernel.

COPYRIGHT

       This manual page Copyright 2006-2010, Jon Masters, Red Hat, Inc.

SEE ALSO

       depmod(8)

AUTHORS

       Jon Masters <jcm@jonmasters.org>
	   Developer

       Robby Workman <rworkman@slackware.com>
	   Developer

       Lucas De Marchi <lucas.de.marchi@gmail.com>
	   Developer

kmod								    01/28/2018							       DEPMOD.D(5)