[uClinux-dev] Stack overflow in the readdir

Davide Zanni d.zanni at signal-elettronica.it
Mon Feb 9 11:54:35 EST 2009


I tried the patch and work fine on my board.

Davide

Il 04/02/2009 14.34, Greg Ungerer ha scritto:
>
> Hi Davide,
>
> Davide Zanni wrote:
>> I have an application that display the content of an USB key with the
>> function readdir. This work fine but with an USB key the application
>> crash because in the file uClibc/libc/sysdeps/linux/common/getdents.c
>> the compiler try to allocate about 31K of data with the function
>> "alloca (red_nbytes)" and the default stack size is 12K in the thread
>> that use the function. To solve the problem I have increased the stack
>> size of that thread.
>> For the other program that use uClibc and the function readdir, like
>> busybox, it's possible that the program will crash. It's possible
>> change the allocation of the memory with the malloc to solve the
>> problem for all the application?
>
> Try the patch attached to:
>
> http://mailman.uclinux.org/pipermail/uclinux-dev/2008-June/046758.html
>
> Please report if it works for you. I have it sitting in my
> queue of patches to apply to the uClinux-dist. I was hoping
> to get some wider confirmation of it working as expected...
>
> Regards
> Greg
>
>
> ------------------------------------------------------------------------
> Greg Ungerer -- Principal Engineer EMAIL: gerg at snapgear.com
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