On Tue, 16 Oct 2012, Chinmay V S wrote:
> Isn't "uname -r" on the console good enough?...
no, the vermagic string is considerably more informative. as i
mentioned, look at the definition in vermagic.h:
#define VERMAGIC_STRING \
UTS_RELEASE " " \
MODULE_VERMAGIC_SMP MODULE_VERMAGIC_PREEMPT \
MODULE_VERMAGIC_MODULE_UNLOAD MODULE_VERMAGIC_MODVERSIONS \
MODULE_ARCH_VERMAGIC
that should (partially?) match the "vermagic" string you see with
modinfo, as in:
$ modinfo vfat
... snip ...
vermagic: 3.6.0-oct8+ SMP mod_unload modversions <--- there!
$
if you check the logic of module loading in kernel/module.c, you'll
see checks being made to see if the two strings are compatible, as in:
... snip ...
static const char vermagic[] = VERMAGIC_STRING;
... snip ...
static int check_modinfo(struct module *mod, struct load_info *info)
{
const char *modmagic = get_modinfo(info, "vermagic");
int err;
/* This is allowed: modprobe --force will invalidate it. */
if (!modmagic) {
err = try_to_force_load(mod, "bad vermagic");
if (err)
return err;
} else if (!same_magic(modmagic, vermagic, info->index.vers)) {
printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
mod->name, modmagic, vermagic);
return -ENOEXEC;
}
... snip ...
it's not that big a deal, but it would be informative to be able to
see the kernel's full vermagic string.
rday
--
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Robert P. J. Day Ottawa, Ontario, CANADA
http://crashcourse.ca
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