Re: Linux Kernel hangs after execve("/bin/sh")

[Prakash kanthi <pkanthi@yahoo.com>]

Hi Jan,

Thanks for the information. But the thing is, i don't
see any error messages on my console to confirm that
the dynamic library loading is failing.

However, i think the first solution you suggested is
worth trying. Where can i get sash source code?

thanks,
Prakash


--- Jan Damborsky <Jan.Damborsky@devcom.cz> wrote:
> Prakash kanthi wrote:
>
> >Hi FOlks,
> >
> >I finally reached the last step (hopefully) of
> linux
> >kernel booting process. Kernel gets stuck after
> doing
> >a 'execve("/bin/sh")'. I tried using different
> >ramdisks, still no difference.
> >
> >I added few printk's in the source, following the
> >function call path from 'execve' call. Following is
> >the output. You can see that, execve goes through
> >without any file permission problems and
> subsequently
> >it tries to open /lib/ld.so.1 flawlessly. After
> that i
> >see nothing on the terminal.
> >
> >---------
> >init:Trying to bring /bin/sh up.
> >do_execve:enter for /bin/sh
> >open_exec:enter for /bin/sh.
> >open_exec:Permission error=0.
> >dentry_open:enter.
> >dentry_open: after file->f_op->open. 0
> >open_exec:enter for /lib/ld.so.1.
> >open_exec:Permission error=0.
> >dentry_open:enter.
> >dentry_open: after file->f_op->open. 0
> >do_execve: after search_binary_handler. retval=0
> >-----------
> >
> >
> >I wrote a small standalone program hello.c to test,
> if
> >i can dynamically load it from init() instead of
> >loading /bin/sh. I compiled the program added it to
> my
> >ramdisk and called from init(). Following is the
> >output. You can see that, it did all of it that it
> did
> >for /bin/sh and also tried to open
> /etc/ld.so.preload
> >and /etc/ld.so.cache and failed. But again towards
> the
> >end, it tries to open /lib/libc.so.6 and succeds
> but
> >still no output is displayed that hello.c is trying
> to
> >print.
> >
> >---------
> >init:Trying to bring /bin/hello up.
> >do_execve:enter for /bin/hello
> >open_exec:enter for /bin/hello.
> >open_exec:Permission error=0.
> >dentry_open:enter.
> >dentry_open: after file->f_op->open. 0
> >open_exec:enter for /lib/ld.so.1.
> >open_exec:Permission error=0.
> >dentry_open:enter.
> >dentry_open: after file->f_op->open. 0
> >do_execve: after search_binary_handler. retval=0
> >sys_open:enter for /etc/ld.so.preload.
> >sys_open:unused_fd=3.
> >filp_open:enter for /etc/ld.so.preload.
> >filp_open:open_namei error -2.
> >sys_open:enter for /etc/ld.so.cache.
> >sys_open:unused_fd=3.
> >filp_open:enter for /etc/ld.so.cache.
> >filp_open:open_namei error -2.
> >sys_open:enter for /lib/libc.so.6.
> >sys_open:unused_fd=3.
> >filp_open:enter for /lib/libc.so.6.
> >filp_open:open_namei error 0.
> >dentry_open:enter.
> >dentry_open: after file->f_op->open. 0
> >-----------
> >
> >Can someone please throw some light on this?
> >
> >Thanks,
> >Prakash
> >
> >
> >
> Hello Prakash,
>
> I have had similar problem with HardHat Linux, but
> when
> I have changed to ElinOS distribution from SYSGO
> corporation,
> all works well. But I have find a little "HOWTO" to
> solve this
> problem in HardHat Linux, may be it will help you a
> bit.
> I am sorry I am not posting URL link to this
> document,
> because I don't remember it, but I think document is
> not
>  so large so I am attaching it. Once more, I
> apologize to other people
> who are not interested in this problem.
>
>
>  By,
>
>                 Jan
>
>
>

> ATTACHMENT part 2 application/x-zip-compressed
name=LoadingSharedLibraryInHardHat.zip


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