execve error

[Avinash Sridharan]

Are you passing the arguments to execve correctly? Usually the EFAULT error
occurs, cause the argument format to execve is not correct and the kernel
is unable to interpret the executable that needs to be launched, or the
parameters that need to be passed to the new process.

Just an example:
http://www.linuxquestions.org/questions/programming-9/execve-alwayse-produces-efault-333778/



On Thu, Apr 23, 2015 at 9:00 AM <kernelnewbies-request at kernelnewbies.org>
wrote:

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>    1. How can I fetch the files likely directory
>       /usr/src/kernels/<kernel  version> from kernel source tree?
> (tianlilai)
>    2. execve error (Rohith)
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 23 Apr 2015 17:59:56 +0800
> From: tianlilai <laitianli2015 at outlook.com>
> Subject: How can I fetch the files likely directory
>         /usr/src/kernels/<kernel        version> from kernel source tree?
> To: kernelnewbies at kernelnewbies.org
> Message-ID: <BLU436-SMTP88F0913B3897AE70E7C950A9ED0 at phx.gbl>
> Content-Type: text/plain; charset="utf-8"; format=flowed
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>
> Hi,I have built the kernel source tree and running in PC mechine.Now I
> want to fetch the files likely directory /usr/src/kernels/<kernel
> version> from this kernel source tree.How can I do? Thanks very much!
>
>
>
>
> ------------------------------
>
> Message: 2
> Date: Thu, 23 Apr 2015 17:55:22 +0530
> From: Rohith <itsnotrohit at gmail.com>
> Subject: execve error
> To: kernelnewbies at kernelnewbies.org
> Message-ID:
>         <
> CABsTBT6S0vRNFo0bxxBcWDx3k8JMpzbYyKbbUB8oxT-W+8Tr-A at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hi all,
>
> I'm facing a strange issue with execve. It fails with -EFAULT
> intermittently. I found that whenever it failed the stack allocated to the
> process is in the last page of the CONFIG_TASK_SIZE.
>
> For example, if CONFIG_TASK_SIZE is set to 0x4000_0000, the process would
> fail in execve if the stack happens to be in the page:
>
> 3ffdf000-40000000 rw-p 00000000 00:00 0          [stack]
>
> I tried changing CONFIG_TASK_SIZE=0x30000000 and the process this time
> fails at the end 0x30000000 address.
>
> I also found that the execve seem to use the largest stack address
> (STACK_TOP_MAX, function __bprm_mm_init(), fs/exec.c) while copying
> argv/envp to the new process space.
>
> I don't know how to debug further. I feel that the user process stack
> should never be allocated at the CONFIG_TASK_SIZE? Any idea or suggestion
> on how to debug further, please tell me.
>
> thanks,
> rohit
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