155  * enum sysctl_writes_mode - supported sysctl write modes
157  * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
165  *	sent to the write syscall. If dealing with strings respect the file
170  * These write modes control how current file position affects the behavior of
171  * updating sysctl values through the proc interface on each write.
206 static int bpf_stats_handler(struct ctl_table *table, int write,  in bpf_stats_handler()  argument
220 	if (write && !capable(CAP_SYS_ADMIN))  in bpf_stats_handler()
225 	ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);  in bpf_stats_handler()
226 	if (write && !ret && val != saved_val) {  in bpf_stats_handler()
244 static int _proc_do_string(char *data, int maxlen, int write,  in _proc_do_string()  argument
255 	if (write) {  in _proc_do_string()
343  * @write: %TRUE if this is a write to the sysctl file
357 int proc_dostring(struct ctl_table *table, int write,  in proc_dostring()  argument
360 	if (write)  in proc_dostring()
363 	return _proc_do_string(table->data, table->maxlen, write, buffer, lenp,  in proc_dostring()
527 				 int write, void *data)  in do_proc_dointvec_conv()  argument
529 	if (write) {  in do_proc_dointvec_conv()
554 				  int write, void *data)  in do_proc_douintvec_conv()  argument
556 	if (write) {  in do_proc_douintvec_conv()
570 		  int write, void *buffer,  in __do_proc_dointvec()  argument
573 			      int write, void *data),  in __do_proc_dointvec()
580 	if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {  in __do_proc_dointvec()
592 	if (write) {  in __do_proc_dointvec()
605 		if (write) {  in __do_proc_dointvec()
630 	if (!write && !first && left && !err)  in __do_proc_dointvec()
632 	if (write && !err && left)  in __do_proc_dointvec()
634 	if (write && first)  in __do_proc_dointvec()
642 static int do_proc_dointvec(struct ctl_table *table, int write,  in do_proc_dointvec()  argument
645 			      int write, void *data),  in do_proc_dointvec()
648 	return __do_proc_dointvec(table->data, table, write,  in do_proc_dointvec()
658 					   int write, void *data),  in do_proc_douintvec_w()  argument
713 					   int write, void *data),  in do_proc_douintvec_r()  argument
741 			       int write, void *buffer,  in __do_proc_douintvec()  argument
745 					   int write, void *data),  in __do_proc_douintvec()
750 	if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {  in __do_proc_douintvec()
770 	if (write)  in __do_proc_douintvec()
776 static int do_proc_douintvec(struct ctl_table *table, int write,  in do_proc_douintvec()  argument
780 					 int write, void *data),  in do_proc_douintvec()
783 	return __do_proc_douintvec(table->data, table, write,  in do_proc_douintvec()
790  * @write: %TRUE if this is a write to the sysctl file
800 int proc_dointvec(struct ctl_table *table, int write, void *buffer,  in proc_dointvec()  argument
803 	return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);  in proc_dointvec()
808 		int write, void *buffer, size_t *lenp, loff_t *ppos)  in proc_dointvec_minmax_warn_RT_change()  argument
812 	if (!IS_ENABLED(CONFIG_PREEMPT_RT) || !write)  in proc_dointvec_minmax_warn_RT_change()
813 		return proc_dointvec_minmax(table, write, buffer, lenp, ppos);  in proc_dointvec_minmax_warn_RT_change()
816 	ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);  in proc_dointvec_minmax_warn_RT_change()
830  * @write: %TRUE if this is a write to the sysctl file
840 int proc_douintvec(struct ctl_table *table, int write, void *buffer,  in proc_douintvec()  argument
843 	return do_proc_douintvec(table, write, buffer, lenp, ppos,  in proc_douintvec()
851 static int proc_taint(struct ctl_table *table, int write,  in proc_taint()  argument
858 	if (write && !capable(CAP_SYS_ADMIN))  in proc_taint()
863 	err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);  in proc_taint()
867 	if (write) {  in proc_taint()
891 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,  in proc_dointvec_minmax_sysadmin()  argument
894 	if (write && !capable(CAP_SYS_ADMIN))  in proc_dointvec_minmax_sysadmin()
897 	return proc_dointvec_minmax(table, write, buffer, lenp, ppos);  in proc_dointvec_minmax_sysadmin()
917 					int write, void *data)  in do_proc_dointvec_minmax_conv()  argument
925 	int *ip = write ? &tmp : valp;  in do_proc_dointvec_minmax_conv()
927 	ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);  in do_proc_dointvec_minmax_conv()
931 	if (write) {  in do_proc_dointvec_minmax_conv()
944  * @write: %TRUE if this is a write to the sysctl file
955  * Returns 0 on success or -EINVAL on write when the range check fails.
957 int proc_dointvec_minmax(struct ctl_table *table, int write,  in proc_dointvec_minmax()  argument
964 	return do_proc_dointvec(table, write, buffer, lenp, ppos,  in proc_dointvec_minmax()
984 					 int write, void *data)  in do_proc_douintvec_minmax_conv()  argument
989 	/* write via temporary local uint for bounds-checking */  in do_proc_douintvec_minmax_conv()
990 	unsigned int *up = write ? &tmp : valp;  in do_proc_douintvec_minmax_conv()
992 	ret = do_proc_douintvec_conv(lvalp, up, write, data);  in do_proc_douintvec_minmax_conv()
996 	if (write) {  in do_proc_douintvec_minmax_conv()
1010  * @write: %TRUE if this is a write to the sysctl file
1024  * Returns 0 on success or -ERANGE on write when the range check fails.
1026 int proc_douintvec_minmax(struct ctl_table *table, int write,  in proc_douintvec_minmax()  argument
1033 	return do_proc_douintvec(table, write, buffer, lenp, ppos,  in proc_douintvec_minmax()
1039 					int write, void *data)  in do_proc_dopipe_max_size_conv()  argument
1041 	if (write) {  in do_proc_dopipe_max_size_conv()
1057 static int proc_dopipe_max_size(struct ctl_table *table, int write,  in proc_dopipe_max_size()  argument
1060 	return do_proc_douintvec(table, write, buffer, lenp, ppos,  in proc_dopipe_max_size()
1078 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,  in proc_dointvec_minmax_coredump()  argument
1081 	int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);  in proc_dointvec_minmax_coredump()
1088 static int proc_dostring_coredump(struct ctl_table *table, int write,  in proc_dostring_coredump()  argument
1091 	int error = proc_dostring(table, write, buffer, lenp, ppos);  in proc_dostring_coredump()
1099 static int sysrq_sysctl_handler(struct ctl_table *table, int write,  in sysrq_sysctl_handler()  argument
1106 	ret = __do_proc_dointvec(&tmp, table, write, buffer,  in sysrq_sysctl_handler()
1108 	if (ret || !write)  in sysrq_sysctl_handler()
1111 	if (write)  in sysrq_sysctl_handler()
1119 		int write, void *buffer, size_t *lenp, loff_t *ppos,  in __do_proc_doulongvec_minmax()  argument
1127 	if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {  in __do_proc_doulongvec_minmax()
1138 	if (write) {  in __do_proc_doulongvec_minmax()
1150 		if (write) {  in __do_proc_doulongvec_minmax()
1178 	if (!write && !first && left && !err)  in __do_proc_doulongvec_minmax()
1180 	if (write && !err)  in __do_proc_doulongvec_minmax()
1182 	if (write && first)  in __do_proc_doulongvec_minmax()
1190 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,  in do_proc_doulongvec_minmax()  argument
1194 	return __do_proc_doulongvec_minmax(table->data, table, write,  in do_proc_doulongvec_minmax()
1201  * @write: %TRUE if this is a write to the sysctl file
1214 int proc_doulongvec_minmax(struct ctl_table *table, int write,  in proc_doulongvec_minmax()  argument
1217     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);  in proc_doulongvec_minmax()
1223  * @write: %TRUE if this is a write to the sysctl file
1237 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,  in proc_doulongvec_ms_jiffies_minmax()  argument
1240     return do_proc_doulongvec_minmax(table, write, buffer,  in proc_doulongvec_ms_jiffies_minmax()
1247 					 int write, void *data)  in do_proc_dointvec_jiffies_conv()  argument
1249 	if (write) {  in do_proc_dointvec_jiffies_conv()
1270 						int write, void *data)  in do_proc_dointvec_userhz_jiffies_conv()  argument
1272 	if (write) {  in do_proc_dointvec_userhz_jiffies_conv()
1293 					    int write, void *data)  in do_proc_dointvec_ms_jiffies_conv()  argument
1295 	if (write) {  in do_proc_dointvec_ms_jiffies_conv()
1319  * @write: %TRUE if this is a write to the sysctl file
1331 int proc_dointvec_jiffies(struct ctl_table *table, int write,  in proc_dointvec_jiffies()  argument
1334     return do_proc_dointvec(table,write,buffer,lenp,ppos,  in proc_dointvec_jiffies()
1341  * @write: %TRUE if this is a write to the sysctl file
1353 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,  in proc_dointvec_userhz_jiffies()  argument
1356     return do_proc_dointvec(table,write,buffer,lenp,ppos,  in proc_dointvec_userhz_jiffies()
1363  * @write: %TRUE if this is a write to the sysctl file
1376 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, void *buffer,  in proc_dointvec_ms_jiffies()  argument
1379 	return do_proc_dointvec(table, write, buffer, lenp, ppos,  in proc_dointvec_ms_jiffies()
1383 static int proc_do_cad_pid(struct ctl_table *table, int write, void *buffer,  in proc_do_cad_pid()  argument
1392 	r = __do_proc_dointvec(&tmp, table, write, buffer,  in proc_do_cad_pid()
1394 	if (r || !write)  in proc_do_cad_pid()
1406  * proc_do_large_bitmap - read/write from/to a large bitmap
1408  * @write: %TRUE if this is a write to the sysctl file
1422 int proc_do_large_bitmap(struct ctl_table *table, int write,  in proc_do_large_bitmap()  argument
1433 	if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {  in proc_do_large_bitmap()
1438 	if (write) {  in proc_do_large_bitmap()
1539 		if (write) {  in proc_do_large_bitmap()
1555 int proc_dostring(struct ctl_table *table, int write,  in proc_dostring()  argument
1561 int proc_dointvec(struct ctl_table *table, int write,  in proc_dointvec()  argument
1567 int proc_douintvec(struct ctl_table *table, int write,  in proc_douintvec()  argument
1573 int proc_dointvec_minmax(struct ctl_table *table, int write,  in proc_dointvec_minmax()  argument
1579 int proc_douintvec_minmax(struct ctl_table *table, int write,  in proc_douintvec_minmax()  argument
1585 int proc_dointvec_jiffies(struct ctl_table *table, int write,  in proc_dointvec_jiffies()  argument
1591 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,  in proc_dointvec_userhz_jiffies()  argument
1597 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,  in proc_dointvec_ms_jiffies()  argument
1603 int proc_doulongvec_minmax(struct ctl_table *table, int write,  in proc_doulongvec_minmax()  argument
1609 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,  in proc_doulongvec_ms_jiffies_minmax()  argument
1615 int proc_do_large_bitmap(struct ctl_table *table, int write,  in proc_do_large_bitmap()  argument
1624 int proc_do_static_key(struct ctl_table *table, int write,  in proc_do_static_key()  argument
1638 	if (write && !capable(CAP_SYS_ADMIN))  in proc_do_static_key()
1643 	ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);  in proc_do_static_key()
1644 	if (write && !ret) {  in proc_do_static_key()