linux-master/kernel/sysctl.c

106  * enum sysctl_writes_mode - supported sysctl write modes
108  * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
116  *	sent to the write syscall. If dealing with strings respect the file
121  * These write modes control how current file position affects the behavior of
122  * updating sysctl values through the proc interface on each write.
146 static int _proc_do_string(char *data, int maxlen, int write,
157 	if (write) {
245  * @write: %TRUE if this is a write to the sysctl file
259 int proc_dostring(struct ctl_table *table, int write,
262 	if (write)
265 	return _proc_do_string(table->data, table->maxlen, write, buffer, lenp,
429 				 int write, void *data)
431 	if (write) {
456 				  int write, void *data)
458 	if (write) {
472 		  int write, void *buffer,
475 			      int write, void *data),
482 	if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
494 	if (write) {
507 		if (write) {
532 	if (!write && !first && left && !err)
534 	if (write && !err && left)
536 	if (write && first)
544 static int do_proc_dointvec(struct ctl_table *table, int write,
547 			      int write, void *data),
550 	return __do_proc_dointvec(table->data, table, write,
560 					   int write, void *data),
615 					   int write, void *data),
643 			       int write, void *buffer,
647 					   int write, void *data),
652 	if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
672 	if (write)
678 int do_proc_douintvec(struct ctl_table *table, int write,
682 				  int write, void *data),
685 	return __do_proc_douintvec(table->data, table, write,
690  * proc_dobool - read/write a bool
692  * @write: %TRUE if this is a write to the sysctl file
705 int proc_dobool(struct ctl_table *table, int write, void *buffer,
721 	res = proc_dointvec(&tmp, write, buffer, lenp, ppos);
724 	if (write)
732  * @write: %TRUE if this is a write to the sysctl file
742 int proc_dointvec(struct ctl_table *table, int write, void *buffer,
745 	return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
751  * @write: %TRUE if this is a write to the sysctl file
761 int proc_douintvec(struct ctl_table *table, int write, void *buffer,
764 	return do_proc_douintvec(table, write, buffer, lenp, ppos,
772 static int proc_taint(struct ctl_table *table, int write,
779 	if (write && !capable(CAP_SYS_ADMIN))
784 	err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
788 	if (write) {
827 					int write, void *data)
835 	int *ip = write ? &tmp : valp;
837 	ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);
841 	if (write) {
854  * @write: %TRUE if this is a write to the sysctl file
865  * Returns 0 on success or -EINVAL on write when the range check fails.
867 int proc_dointvec_minmax(struct ctl_table *table, int write,
874 	return do_proc_dointvec(table, write, buffer, lenp, ppos,
894 					 int write, void *data)
899 	/* write via temporary local uint for bounds-checking */
900 	unsigned int *up = write ? &tmp : valp;
902 	ret = do_proc_douintvec_conv(lvalp, up, write, data);
906 	if (write) {
920  * @write: %TRUE if this is a write to the sysctl file
934  * Returns 0 on success or -ERANGE on write when the range check fails.
936 int proc_douintvec_minmax(struct ctl_table *table, int write,
943 	return do_proc_douintvec(table, write, buffer, lenp, ppos,
950  * @write: %TRUE if this is a write to the sysctl file
962  * Returns 0 on success or an error on write when the range check fails.
964 int proc_dou8vec_minmax(struct ctl_table *table, int write,
996 	res = do_proc_douintvec(&tmp, write, buffer, lenp, ppos,
1000 	if (write)
1007 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
1014 	ret = __do_proc_dointvec(&tmp, table, write, buffer,
1016 	if (ret || !write)
1019 	if (write)
1027 		int write, void *buffer, size_t *lenp, loff_t *ppos,
1035 	if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1046 	if (write) {
1058 		if (write) {
1087 	if (!write && !first && left && !err)
1089 	if (write && !err)
1091 	if (write && first)
1099 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
1103 	return __do_proc_doulongvec_minmax(table->data, table, write,
1110  * @write: %TRUE if this is a write to the sysctl file
1123 int proc_doulongvec_minmax(struct ctl_table *table, int write,
1126     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1132  * @write: %TRUE if this is a write to the sysctl file
1146 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1149     return do_proc_doulongvec_minmax(table, write, buffer,
1156 					 int write, void *data)
1158 	if (write) {
1182 						int write, void *data)
1184 	if (write) {
1205 					    int write, void *data)
1207 	if (write) {
1229 						int *valp, int write, void *data)
1237 	int *ip = write ? &tmp : valp;
1239 	ret = do_proc_dointvec_ms_jiffies_conv(negp, lvalp, ip, write, data);
1243 	if (write) {
1255  * @write: %TRUE if this is a write to the sysctl file
1267 int proc_dointvec_jiffies(struct ctl_table *table, int write,
1270     return do_proc_dointvec(table,write,buffer,lenp,ppos,
1274 int proc_dointvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1281 	return do_proc_dointvec(table, write, buffer, lenp, ppos,
1288  * @write: %TRUE if this is a write to the sysctl file
1300 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1303 	return do_proc_dointvec(table, write, buffer, lenp, ppos,
1310  * @write: %TRUE if this is a write to the sysctl file
1323 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, void *buffer,
1326 	return do_proc_dointvec(table, write, buffer, lenp, ppos,
1330 static int proc_do_cad_pid(struct ctl_table *table, int write, void *buffer,
1339 	r = __do_proc_dointvec(&tmp, table, write, buffer,
1341 	if (r || !write)
1353  * proc_do_large_bitmap - read/write from/to a large bitmap
1355  * @write: %TRUE if this is a write to the sysctl file
1369 int proc_do_large_bitmap(struct ctl_table *table, int write,
1379 	if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
1384 	if (write) {
1485 		if (write) {
1501 int proc_dostring(struct ctl_table *table, int write,
1507 int proc_dobool(struct ctl_table *table, int write,
1513 int proc_dointvec(struct ctl_table *table, int write,
1519 int proc_douintvec(struct ctl_table *table, int write,
1525 int proc_dointvec_minmax(struct ctl_table *table, int write,
1531 int proc_douintvec_minmax(struct ctl_table *table, int write,
1537 int proc_dou8vec_minmax(struct ctl_table *table, int write,
1543 int proc_dointvec_jiffies(struct ctl_table *table, int write,
1549 int proc_dointvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1555 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1561 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1567 int proc_doulongvec_minmax(struct ctl_table *table, int write,
1573 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1579 int proc_do_large_bitmap(struct ctl_table *table, int write,
1588 int proc_do_static_key(struct ctl_table *table, int write,
1602 	if (write && !capable(CAP_SYS_ADMIN))
1607 	ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
1608 	if (write && !ret) {