On Wed, 15 Jul 2009, Mulyadi Santosa wrote:
> On 7/15/09, Robert P. J. Day <[email protected]> wrote:
> >
> > i'm aware of a number of ways to debug kernel space variables from
> > user space, but i'm not sure there's a way to do it if you're
> > extremely limited in the information you have at hand.
> >
> > the scenario: a running 64-bit fedora 11 system. there is no
> > "vmlinux" file at hand -- all i have is the vmlinuz file representing
> > the running kernel. i have "gdb" installed, and there exist the files
> > /proc/kcore and /proc/kallsyms. but given only that, is there any way
> > to list the current value of, say, the kernel variable "jiffies"?
> >
> > i can see in /proc/kallsyms the entry
> >
> > ffffffffff600880 D __jiffies
> >
> > but without the vmlinux file, i don't think gdb will do me any good.
> > or am i misremembering?
> >
> > rday
>
> IIRC, we've talked about it around 2 years ago. In fact, I wrote it
> down in my blog. Is this what you're looking for?
>
> http://the-hydra.blogspot.com/2007/07/observing-kernel-variables-content-with.html
>
> PS: you might need to adapt how much byte you read since you're using
> 64 bit now...
i'd better review all that since it's been a couple years. :-)
rday
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Robert P. J. Day Waterloo, Ontario, CANADA
Linux Consulting, Training and Annoying Kernel Pedantry.
Web page: http://crashcourse.ca
Twitter: http://twitter.com/rpjday
"Kernel Newbie Corner" column @ linux.com: http://cli.gs/WG6WYX
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