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param: hand arguments after -- straight to init

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The kernel passes any args it doesn't need through to init, except it
assumes anything containing '.' belongs to the kernel (for a module).
This change means all users can clearly distinguish which arguments
are for init.

For example, the kernel uses debug ("dee-bug") to mean log everything to
the console, where systemd uses the debug from the Scandinavian "day-boog"
meaning "fail to boot".  If a future versions uses argv[] instead of
reading /proc/cmdline, this confusion will be avoided.

eg: test 'FOO="this is --foo"' -- 'systemd.debug="true true true"'

Gives:
argv[0] = '/debug-init'
argv[1] = 'test'
argv[2] = 'systemd.debug=true true true'
envp[0] = 'HOME=/'
envp[1] = 'TERM=linux'
envp[2] = 'FOO=this is --foo'

Signed-off-by: Rusty Russell <[email protected]>
This commit is contained in:
Rusty Russell 2014-04-28 11:34:33 +09:30
commit 51e158c12a
4 changed files with 53 additions and 19 deletions
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12
kernel/module.c
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@ -3193,6 +3193,7 @@ static int load_module(struct load_info *info, const char __user *uargs,
{
struct module *mod;
long err;
char *after_dashes;
err = module_sig_check(info);
if (err)
@ -3277,10 +3278,15 @@ static int load_module(struct load_info *info, const char __user *uargs,
goto ddebug_cleanup;
/* Module is ready to execute: parsing args may do that. */
err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp,
-32768, 32767, unknown_module_param_cb);
if (err < 0)
after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp,
-32768, 32767, unknown_module_param_cb);
if (IS_ERR(after_dashes)) {
err = PTR_ERR(after_dashes);
goto bug_cleanup;
} else if (after_dashes) {
pr_warn("%s: parameters '%s' after `--' ignored\n",
mod->name, after_dashes);
}
/* Link in to syfs. */
err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp);