![Greg Kroah-Hartman](/assets/img/avatar_default.png)
The module files, refcnt, version, and srcversion did not properly increment the owner's module reference count, allowing the modules to be removed while the files were open, causing oopses. This patch fixes this, and also fixes the problem that the version and srcversion files were not showing up, unless CONFIG_MODULE_UNLOAD was enabled, which is not correct. Cc: Nathan Lynch <ntl@pobox.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
720 lines
17 KiB
C
720 lines
17 KiB
C
/* Helpers for initial module or kernel cmdline parsing
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Copyright (C) 2001 Rusty Russell.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/config.h>
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#include <linux/moduleparam.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#if 0
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#define DEBUGP printk
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#else
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#define DEBUGP(fmt, a...)
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#endif
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static inline int dash2underscore(char c)
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{
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if (c == '-')
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return '_';
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return c;
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}
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static inline int parameq(const char *input, const char *paramname)
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{
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unsigned int i;
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for (i = 0; dash2underscore(input[i]) == paramname[i]; i++)
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if (input[i] == '\0')
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return 1;
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return 0;
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}
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static int parse_one(char *param,
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char *val,
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struct kernel_param *params,
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unsigned num_params,
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int (*handle_unknown)(char *param, char *val))
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{
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unsigned int i;
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/* Find parameter */
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for (i = 0; i < num_params; i++) {
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if (parameq(param, params[i].name)) {
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DEBUGP("They are equal! Calling %p\n",
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params[i].set);
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return params[i].set(val, ¶ms[i]);
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}
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}
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if (handle_unknown) {
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DEBUGP("Unknown argument: calling %p\n", handle_unknown);
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return handle_unknown(param, val);
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}
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DEBUGP("Unknown argument `%s'\n", param);
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return -ENOENT;
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}
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/* You can use " around spaces, but can't escape ". */
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/* Hyphens and underscores equivalent in parameter names. */
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static char *next_arg(char *args, char **param, char **val)
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{
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unsigned int i, equals = 0;
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int in_quote = 0, quoted = 0;
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char *next;
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if (*args == '"') {
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args++;
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in_quote = 1;
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quoted = 1;
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}
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for (i = 0; args[i]; i++) {
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if (args[i] == ' ' && !in_quote)
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break;
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if (equals == 0) {
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if (args[i] == '=')
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equals = i;
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}
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if (args[i] == '"')
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in_quote = !in_quote;
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}
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*param = args;
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if (!equals)
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*val = NULL;
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else {
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args[equals] = '\0';
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*val = args + equals + 1;
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/* Don't include quotes in value. */
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if (**val == '"') {
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(*val)++;
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if (args[i-1] == '"')
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args[i-1] = '\0';
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}
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if (quoted && args[i-1] == '"')
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args[i-1] = '\0';
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}
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if (args[i]) {
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args[i] = '\0';
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next = args + i + 1;
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} else
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next = args + i;
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/* Chew up trailing spaces. */
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while (*next == ' ')
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next++;
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return next;
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}
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/* Args looks like "foo=bar,bar2 baz=fuz wiz". */
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int parse_args(const char *name,
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char *args,
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struct kernel_param *params,
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unsigned num,
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int (*unknown)(char *param, char *val))
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{
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char *param, *val;
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DEBUGP("Parsing ARGS: %s\n", args);
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/* Chew leading spaces */
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while (*args == ' ')
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args++;
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while (*args) {
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int ret;
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args = next_arg(args, ¶m, &val);
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ret = parse_one(param, val, params, num, unknown);
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switch (ret) {
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case -ENOENT:
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printk(KERN_ERR "%s: Unknown parameter `%s'\n",
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name, param);
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return ret;
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case -ENOSPC:
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printk(KERN_ERR
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"%s: `%s' too large for parameter `%s'\n",
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name, val ?: "", param);
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return ret;
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case 0:
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break;
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default:
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printk(KERN_ERR
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"%s: `%s' invalid for parameter `%s'\n",
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name, val ?: "", param);
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return ret;
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}
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}
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/* All parsed OK. */
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return 0;
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}
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/* Lazy bastard, eh? */
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#define STANDARD_PARAM_DEF(name, type, format, tmptype, strtolfn) \
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int param_set_##name(const char *val, struct kernel_param *kp) \
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{ \
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char *endp; \
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tmptype l; \
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\
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if (!val) return -EINVAL; \
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l = strtolfn(val, &endp, 0); \
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if (endp == val || ((type)l != l)) \
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return -EINVAL; \
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*((type *)kp->arg) = l; \
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return 0; \
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} \
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int param_get_##name(char *buffer, struct kernel_param *kp) \
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{ \
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return sprintf(buffer, format, *((type *)kp->arg)); \
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}
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STANDARD_PARAM_DEF(byte, unsigned char, "%c", unsigned long, simple_strtoul);
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STANDARD_PARAM_DEF(short, short, "%hi", long, simple_strtol);
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STANDARD_PARAM_DEF(ushort, unsigned short, "%hu", unsigned long, simple_strtoul);
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STANDARD_PARAM_DEF(int, int, "%i", long, simple_strtol);
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STANDARD_PARAM_DEF(uint, unsigned int, "%u", unsigned long, simple_strtoul);
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STANDARD_PARAM_DEF(long, long, "%li", long, simple_strtol);
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STANDARD_PARAM_DEF(ulong, unsigned long, "%lu", unsigned long, simple_strtoul);
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int param_set_charp(const char *val, struct kernel_param *kp)
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{
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if (!val) {
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printk(KERN_ERR "%s: string parameter expected\n",
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kp->name);
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return -EINVAL;
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}
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if (strlen(val) > 1024) {
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printk(KERN_ERR "%s: string parameter too long\n",
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kp->name);
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return -ENOSPC;
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}
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*(char **)kp->arg = (char *)val;
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return 0;
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}
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int param_get_charp(char *buffer, struct kernel_param *kp)
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{
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return sprintf(buffer, "%s", *((char **)kp->arg));
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}
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int param_set_bool(const char *val, struct kernel_param *kp)
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{
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/* No equals means "set"... */
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if (!val) val = "1";
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/* One of =[yYnN01] */
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switch (val[0]) {
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case 'y': case 'Y': case '1':
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*(int *)kp->arg = 1;
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return 0;
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case 'n': case 'N': case '0':
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*(int *)kp->arg = 0;
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return 0;
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}
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return -EINVAL;
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}
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int param_get_bool(char *buffer, struct kernel_param *kp)
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{
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/* Y and N chosen as being relatively non-coder friendly */
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return sprintf(buffer, "%c", (*(int *)kp->arg) ? 'Y' : 'N');
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}
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int param_set_invbool(const char *val, struct kernel_param *kp)
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{
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int boolval, ret;
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struct kernel_param dummy = { .arg = &boolval };
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ret = param_set_bool(val, &dummy);
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if (ret == 0)
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*(int *)kp->arg = !boolval;
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return ret;
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}
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int param_get_invbool(char *buffer, struct kernel_param *kp)
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{
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int val;
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struct kernel_param dummy = { .arg = &val };
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val = !*(int *)kp->arg;
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return param_get_bool(buffer, &dummy);
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}
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/* We cheat here and temporarily mangle the string. */
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int param_array(const char *name,
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const char *val,
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unsigned int min, unsigned int max,
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void *elem, int elemsize,
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int (*set)(const char *, struct kernel_param *kp),
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int *num)
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{
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int ret;
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struct kernel_param kp;
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char save;
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/* Get the name right for errors. */
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kp.name = name;
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kp.arg = elem;
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/* No equals sign? */
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if (!val) {
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printk(KERN_ERR "%s: expects arguments\n", name);
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return -EINVAL;
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}
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*num = 0;
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/* We expect a comma-separated list of values. */
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do {
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int len;
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if (*num == max) {
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printk(KERN_ERR "%s: can only take %i arguments\n",
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name, max);
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return -EINVAL;
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}
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len = strcspn(val, ",");
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/* nul-terminate and parse */
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save = val[len];
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((char *)val)[len] = '\0';
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ret = set(val, &kp);
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if (ret != 0)
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return ret;
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kp.arg += elemsize;
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val += len+1;
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(*num)++;
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} while (save == ',');
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if (*num < min) {
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printk(KERN_ERR "%s: needs at least %i arguments\n",
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name, min);
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return -EINVAL;
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}
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return 0;
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}
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int param_array_set(const char *val, struct kernel_param *kp)
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{
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struct kparam_array *arr = kp->arg;
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unsigned int temp_num;
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return param_array(kp->name, val, 1, arr->max, arr->elem,
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arr->elemsize, arr->set, arr->num ?: &temp_num);
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}
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int param_array_get(char *buffer, struct kernel_param *kp)
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{
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int i, off, ret;
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struct kparam_array *arr = kp->arg;
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struct kernel_param p;
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p = *kp;
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for (i = off = 0; i < (arr->num ? *arr->num : arr->max); i++) {
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if (i)
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buffer[off++] = ',';
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p.arg = arr->elem + arr->elemsize * i;
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ret = arr->get(buffer + off, &p);
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if (ret < 0)
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return ret;
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off += ret;
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}
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buffer[off] = '\0';
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return off;
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}
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int param_set_copystring(const char *val, struct kernel_param *kp)
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{
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struct kparam_string *kps = kp->arg;
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if (strlen(val)+1 > kps->maxlen) {
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printk(KERN_ERR "%s: string doesn't fit in %u chars.\n",
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kp->name, kps->maxlen-1);
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return -ENOSPC;
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}
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strcpy(kps->string, val);
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return 0;
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}
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int param_get_string(char *buffer, struct kernel_param *kp)
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{
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struct kparam_string *kps = kp->arg;
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return strlcpy(buffer, kps->string, kps->maxlen);
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}
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/* sysfs output in /sys/modules/XYZ/parameters/ */
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extern struct kernel_param __start___param[], __stop___param[];
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#define MAX_KBUILD_MODNAME KOBJ_NAME_LEN
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struct param_attribute
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{
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struct module_attribute mattr;
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struct kernel_param *param;
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};
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struct module_param_attrs
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{
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struct attribute_group grp;
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struct param_attribute attrs[0];
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};
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#define to_param_attr(n) container_of(n, struct param_attribute, mattr);
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static ssize_t param_attr_show(struct module_attribute *mattr,
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struct module *mod, char *buf)
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{
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int count;
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struct param_attribute *attribute = to_param_attr(mattr);
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if (!attribute->param->get)
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return -EPERM;
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count = attribute->param->get(buf, attribute->param);
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if (count > 0) {
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strcat(buf, "\n");
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++count;
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}
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return count;
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}
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/* sysfs always hands a nul-terminated string in buf. We rely on that. */
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static ssize_t param_attr_store(struct module_attribute *mattr,
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struct module *owner,
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const char *buf, size_t len)
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{
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int err;
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struct param_attribute *attribute = to_param_attr(mattr);
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if (!attribute->param->set)
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return -EPERM;
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err = attribute->param->set(buf, attribute->param);
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if (!err)
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return len;
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return err;
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}
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#ifdef CONFIG_MODULES
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#define __modinit
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#else
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#define __modinit __init
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#endif
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/*
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* param_sysfs_setup - setup sysfs support for one module or KBUILD_MODNAME
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* @mk: struct module_kobject (contains parent kobject)
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* @kparam: array of struct kernel_param, the actual parameter definitions
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* @num_params: number of entries in array
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* @name_skip: offset where the parameter name start in kparam[].name. Needed for built-in "modules"
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*
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* Create a kobject for a (per-module) group of parameters, and create files
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* in sysfs. A pointer to the param_kobject is returned on success,
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* NULL if there's no parameter to export, or other ERR_PTR(err).
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*/
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static __modinit struct module_param_attrs *
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param_sysfs_setup(struct module_kobject *mk,
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struct kernel_param *kparam,
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unsigned int num_params,
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unsigned int name_skip)
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{
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struct module_param_attrs *mp;
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unsigned int valid_attrs = 0;
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unsigned int i, size[2];
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struct param_attribute *pattr;
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struct attribute **gattr;
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int err;
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for (i=0; i<num_params; i++) {
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if (kparam[i].perm)
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valid_attrs++;
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}
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if (!valid_attrs)
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return NULL;
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size[0] = ALIGN(sizeof(*mp) +
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valid_attrs * sizeof(mp->attrs[0]),
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sizeof(mp->grp.attrs[0]));
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size[1] = (valid_attrs + 1) * sizeof(mp->grp.attrs[0]);
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mp = kmalloc(size[0] + size[1], GFP_KERNEL);
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if (!mp)
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return ERR_PTR(-ENOMEM);
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mp->grp.name = "parameters";
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mp->grp.attrs = (void *)mp + size[0];
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pattr = &mp->attrs[0];
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gattr = &mp->grp.attrs[0];
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for (i = 0; i < num_params; i++) {
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struct kernel_param *kp = &kparam[i];
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if (kp->perm) {
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pattr->param = kp;
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pattr->mattr.show = param_attr_show;
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pattr->mattr.store = param_attr_store;
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pattr->mattr.attr.name = (char *)&kp->name[name_skip];
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pattr->mattr.attr.owner = mk->mod;
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pattr->mattr.attr.mode = kp->perm;
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*(gattr++) = &(pattr++)->mattr.attr;
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}
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}
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*gattr = NULL;
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if ((err = sysfs_create_group(&mk->kobj, &mp->grp))) {
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kfree(mp);
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return ERR_PTR(err);
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}
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return mp;
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}
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#ifdef CONFIG_MODULES
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/*
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* module_param_sysfs_setup - setup sysfs support for one module
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* @mod: module
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* @kparam: module parameters (array)
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* @num_params: number of module parameters
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*
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* Adds sysfs entries for module parameters, and creates a link from
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* /sys/module/[mod->name]/parameters to /sys/parameters/[mod->name]/
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*/
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int module_param_sysfs_setup(struct module *mod,
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struct kernel_param *kparam,
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unsigned int num_params)
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{
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struct module_param_attrs *mp;
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mp = param_sysfs_setup(&mod->mkobj, kparam, num_params, 0);
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if (IS_ERR(mp))
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return PTR_ERR(mp);
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mod->param_attrs = mp;
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return 0;
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}
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/*
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* module_param_sysfs_remove - remove sysfs support for one module
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* @mod: module
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*
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* Remove sysfs entries for module parameters and the corresponding
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* kobject.
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*/
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void module_param_sysfs_remove(struct module *mod)
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{
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if (mod->param_attrs) {
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sysfs_remove_group(&mod->mkobj.kobj,
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&mod->param_attrs->grp);
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/* We are positive that no one is using any param
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* attrs at this point. Deallocate immediately. */
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kfree(mod->param_attrs);
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mod->param_attrs = NULL;
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}
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}
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#endif
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/*
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* kernel_param_sysfs_setup - wrapper for built-in params support
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*/
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static void __init kernel_param_sysfs_setup(const char *name,
|
|
struct kernel_param *kparam,
|
|
unsigned int num_params,
|
|
unsigned int name_skip)
|
|
{
|
|
struct module_kobject *mk;
|
|
|
|
mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL);
|
|
BUG_ON(!mk);
|
|
|
|
mk->mod = THIS_MODULE;
|
|
kobj_set_kset_s(mk, module_subsys);
|
|
kobject_set_name(&mk->kobj, name);
|
|
kobject_register(&mk->kobj);
|
|
|
|
/* no need to keep the kobject if no parameter is exported */
|
|
if (!param_sysfs_setup(mk, kparam, num_params, name_skip)) {
|
|
kobject_unregister(&mk->kobj);
|
|
kfree(mk);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* param_sysfs_builtin - add contents in /sys/parameters for built-in modules
|
|
*
|
|
* Add module_parameters to sysfs for "modules" built into the kernel.
|
|
*
|
|
* The "module" name (KBUILD_MODNAME) is stored before a dot, the
|
|
* "parameter" name is stored behind a dot in kernel_param->name. So,
|
|
* extract the "module" name for all built-in kernel_param-eters,
|
|
* and for all who have the same, call kernel_param_sysfs_setup.
|
|
*/
|
|
static void __init param_sysfs_builtin(void)
|
|
{
|
|
struct kernel_param *kp, *kp_begin = NULL;
|
|
unsigned int i, name_len, count = 0;
|
|
char modname[MAX_KBUILD_MODNAME + 1] = "";
|
|
|
|
for (i=0; i < __stop___param - __start___param; i++) {
|
|
char *dot;
|
|
|
|
kp = &__start___param[i];
|
|
|
|
/* We do not handle args without periods. */
|
|
dot = memchr(kp->name, '.', MAX_KBUILD_MODNAME);
|
|
if (!dot) {
|
|
DEBUGP("couldn't find period in %s\n", kp->name);
|
|
continue;
|
|
}
|
|
name_len = dot - kp->name;
|
|
|
|
/* new kbuild_modname? */
|
|
if (strlen(modname) != name_len
|
|
|| strncmp(modname, kp->name, name_len) != 0) {
|
|
/* add a new kobject for previous kernel_params. */
|
|
if (count)
|
|
kernel_param_sysfs_setup(modname,
|
|
kp_begin,
|
|
count,
|
|
strlen(modname)+1);
|
|
|
|
strncpy(modname, kp->name, name_len);
|
|
modname[name_len] = '\0';
|
|
count = 0;
|
|
kp_begin = kp;
|
|
}
|
|
count++;
|
|
}
|
|
|
|
/* last kernel_params need to be registered as well */
|
|
if (count)
|
|
kernel_param_sysfs_setup(modname, kp_begin, count,
|
|
strlen(modname)+1);
|
|
}
|
|
|
|
|
|
/* module-related sysfs stuff */
|
|
#ifdef CONFIG_SYSFS
|
|
|
|
#define to_module_attr(n) container_of(n, struct module_attribute, attr);
|
|
#define to_module_kobject(n) container_of(n, struct module_kobject, kobj);
|
|
|
|
static ssize_t module_attr_show(struct kobject *kobj,
|
|
struct attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct module_attribute *attribute;
|
|
struct module_kobject *mk;
|
|
int ret;
|
|
|
|
attribute = to_module_attr(attr);
|
|
mk = to_module_kobject(kobj);
|
|
|
|
if (!attribute->show)
|
|
return -EIO;
|
|
|
|
ret = attribute->show(attribute, mk->mod, buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t module_attr_store(struct kobject *kobj,
|
|
struct attribute *attr,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct module_attribute *attribute;
|
|
struct module_kobject *mk;
|
|
int ret;
|
|
|
|
attribute = to_module_attr(attr);
|
|
mk = to_module_kobject(kobj);
|
|
|
|
if (!attribute->store)
|
|
return -EIO;
|
|
|
|
ret = attribute->store(attribute, mk->mod, buf, len);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct sysfs_ops module_sysfs_ops = {
|
|
.show = module_attr_show,
|
|
.store = module_attr_store,
|
|
};
|
|
|
|
#else
|
|
static struct sysfs_ops module_sysfs_ops = {
|
|
.show = NULL,
|
|
.store = NULL,
|
|
};
|
|
#endif
|
|
|
|
static struct kobj_type module_ktype = {
|
|
.sysfs_ops = &module_sysfs_ops,
|
|
};
|
|
|
|
decl_subsys(module, &module_ktype, NULL);
|
|
|
|
/*
|
|
* param_sysfs_init - wrapper for built-in params support
|
|
*/
|
|
static int __init param_sysfs_init(void)
|
|
{
|
|
subsystem_register(&module_subsys);
|
|
|
|
param_sysfs_builtin();
|
|
|
|
return 0;
|
|
}
|
|
__initcall(param_sysfs_init);
|
|
|
|
EXPORT_SYMBOL(param_set_byte);
|
|
EXPORT_SYMBOL(param_get_byte);
|
|
EXPORT_SYMBOL(param_set_short);
|
|
EXPORT_SYMBOL(param_get_short);
|
|
EXPORT_SYMBOL(param_set_ushort);
|
|
EXPORT_SYMBOL(param_get_ushort);
|
|
EXPORT_SYMBOL(param_set_int);
|
|
EXPORT_SYMBOL(param_get_int);
|
|
EXPORT_SYMBOL(param_set_uint);
|
|
EXPORT_SYMBOL(param_get_uint);
|
|
EXPORT_SYMBOL(param_set_long);
|
|
EXPORT_SYMBOL(param_get_long);
|
|
EXPORT_SYMBOL(param_set_ulong);
|
|
EXPORT_SYMBOL(param_get_ulong);
|
|
EXPORT_SYMBOL(param_set_charp);
|
|
EXPORT_SYMBOL(param_get_charp);
|
|
EXPORT_SYMBOL(param_set_bool);
|
|
EXPORT_SYMBOL(param_get_bool);
|
|
EXPORT_SYMBOL(param_set_invbool);
|
|
EXPORT_SYMBOL(param_get_invbool);
|
|
EXPORT_SYMBOL(param_array_set);
|
|
EXPORT_SYMBOL(param_array_get);
|
|
EXPORT_SYMBOL(param_set_copystring);
|
|
EXPORT_SYMBOL(param_get_string);
|