Hi...
On 1/29/08, Manish Katiyar <mkatiyar@xxxxxxxxx> wrote:
> Hi,
>
> Is it possible to print or access the environment variables of a
> process from kernel module. I know it can be done from userspace, but
> if there is a running process I don't know if there is any way to
> access/print the environment of a process from userspace. So I thought
> if it is possible to write a module which accepts a pid during load
> and then prints its environment variables.
So you want to access environment variables? let's see:
$ ltrace -f -n 4 -o test.txt printenv
$ cat test.txt
3310 __libc_start_main(0x8048daa, 1, 0xbffd0ad4, 0x804a318, 0x804a36c
<unfinished ...>
3310 setlocale(6, "") = "en_US.UTF-8"
3310 bindtextdomain("coreutils", "/usr/share/locale") = "/usr/share/locale"
3310 textdomain("coreutils") = "coreutils"
3310 __cxa_atexit(0x8048fc1, 0, 0, 0x804bcc0, 0xbffd0a48) = 0
3310 getopt_long(1, 0xbffd0ad4, "", 0x804a428, NULL) = -1
^^^^^^^^^^^^
3310 puts("SSH_AGENT_PID=3077") = 19
from man getopt_long:
int getopt_long(int argc, char * const argv[],
const char *optstring,
const struct option *longopts, int *longindex);
thus, 0xbffd0ad4 should be the location of environment variables.
remember that this is user space address.
regards,
Mulyadi.
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