read kernel config from running kernel

t0bias · 11-16-2007, 11:26 AM

hi,

i need to know some settings of a running kernel in order to build
my software. if make oldconfig in a kernel-source would work (of
course i cannot bring a complete kernel source with my software
and do make oldconfig...)
but there is no /proc/config.gz, how can i get the kernel config from
a running kernel?

thanks,

toby

pljvaldez · 11-16-2007, 12:47 PM

In Debian, at least, the config file for every kernel installed is in the /boot directory with the kernel.

t0bias · 11-16-2007, 01:19 PM

thanks, but this is something just debian does, but others don't.. unfortunately..

ta0kira · 11-16-2007, 06:02 PM

I think /proc/config.gz is the only way unless the actual config file is stored somewhere. If you install the kernel sources for your distro, do you have /usr/src/linux/.config? What exactly do you need to know about it?
ta0kira

t0bias · 11-17-2007, 05:49 AM

hm.. no, if you do not have a /proc/config.gz
you can still do "make oldconfig" in a kernel source
tree to get the actial config.
but i found the solution myself:
the kernel-sources bring a script in the scripts-folder
called "extract-ikconfig" that can extract the config
from a bzImage. thanks everyone!

bhussein · 01-23-2014, 06:20 AM

Hi t0bias,

i tried to run the script from /usr/src/linux-3.10 folder scripts

but i am getting an error message

Usage: extract-ikconfig <kernel-image>

what did you do to get the configurations?

thanks,