185  * enum sysctl_writes_mode - supported sysctl write modes
187  * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
195  *	sent to the write syscall. If dealing with strings respect the file
200  * These write modes control how current file position affects the behavior of
201  * updating sysctl values through the proc interface on each write.
211 static int proc_do_cad_pid(struct ctl_table *table, int write,
213 static int proc_taint(struct ctl_table *table, int write,
218 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
222 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
225 static int proc_dostring_coredump(struct ctl_table *table, int write,
228 static int proc_dopipe_max_size(struct ctl_table *table, int write,
235 static int sysrq_sysctl_handler(struct ctl_table *table, int write,  in sysrq_sysctl_handler()  argument
241 	error = proc_dointvec(table, write, buffer, lenp, ppos);  in sysrq_sysctl_handler()
245 	if (write)  in sysrq_sysctl_handler()
2000 static int _proc_do_string(char *data, int maxlen, int write,  in _proc_do_string()  argument
2013 	if (write) {  in _proc_do_string()
2104  * @write: %TRUE if this is a write to the sysctl file
2118 int proc_dostring(struct ctl_table *table, int write,  in proc_dostring()  argument
2121 	if (write)  in proc_dostring()
2124 	return _proc_do_string((char *)(table->data), table->maxlen, write,  in proc_dostring()
2291 				 int write, void *data)  in do_proc_dointvec_conv()  argument
2293 	if (write) {  in do_proc_dointvec_conv()
2318 				  int write, void *data)  in do_proc_douintvec_conv()  argument
2320 	if (write) {  in do_proc_douintvec_conv()
2334 		  int write, void __user *buffer,  in __do_proc_dointvec()  argument
2337 			      int write, void *data),  in __do_proc_dointvec()
2344 	if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {  in __do_proc_dointvec()
2356 	if (write) {  in __do_proc_dointvec()
2371 		if (write) {  in __do_proc_dointvec()
2400 	if (!write && !first && left && !err)  in __do_proc_dointvec()
2402 	if (write && !err && left)  in __do_proc_dointvec()
2404 	if (write) {  in __do_proc_dointvec()
2415 static int do_proc_dointvec(struct ctl_table *table, int write,  in do_proc_dointvec()  argument
2418 			      int write, void *data),  in do_proc_dointvec()
2421 	return __do_proc_dointvec(table->data, table, write,  in do_proc_dointvec()
2431 					   int write, void *data),  in do_proc_douintvec_w()  argument
2491 					   int write, void *data),  in do_proc_douintvec_r()  argument
2519 			       int write, void __user *buffer,  in __do_proc_douintvec()  argument
2523 					   int write, void *data),  in __do_proc_douintvec()
2528 	if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {  in __do_proc_douintvec()
2548 	if (write)  in __do_proc_douintvec()
2554 static int do_proc_douintvec(struct ctl_table *table, int write,  in do_proc_douintvec()  argument
2558 					 int write, void *data),  in do_proc_douintvec()
2561 	return __do_proc_douintvec(table->data, table, write,  in do_proc_douintvec()
2568  * @write: %TRUE if this is a write to the sysctl file
2578 int proc_dointvec(struct ctl_table *table, int write,  in proc_dointvec()  argument
2581 	return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);  in proc_dointvec()
2587  * @write: %TRUE if this is a write to the sysctl file
2597 int proc_douintvec(struct ctl_table *table, int write,  in proc_douintvec()  argument
2600 	return do_proc_douintvec(table, write, buffer, lenp, ppos,  in proc_douintvec()
2608 static int proc_taint(struct ctl_table *table, int write,  in proc_taint()  argument
2615 	if (write && !capable(CAP_SYS_ADMIN))  in proc_taint()
2620 	err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);  in proc_taint()
2624 	if (write) {  in proc_taint()
2640 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,  in proc_dointvec_minmax_sysadmin()  argument
2643 	if (write && !capable(CAP_SYS_ADMIN))  in proc_dointvec_minmax_sysadmin()
2646 	return proc_dointvec_minmax(table, write, buffer, lenp, ppos);  in proc_dointvec_minmax_sysadmin()
2666 					int write, void *data)  in do_proc_dointvec_minmax_conv()  argument
2674 	int *ip = write ? &tmp : valp;  in do_proc_dointvec_minmax_conv()
2676 	ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);  in do_proc_dointvec_minmax_conv()
2680 	if (write) {  in do_proc_dointvec_minmax_conv()
2693  * @write: %TRUE if this is a write to the sysctl file
2704  * Returns 0 on success or -EINVAL on write when the range check fails.
2706 int proc_dointvec_minmax(struct ctl_table *table, int write,  in proc_dointvec_minmax()  argument
2713 	return do_proc_dointvec(table, write, buffer, lenp, ppos,  in proc_dointvec_minmax()
2733 					 int write, void *data)  in do_proc_douintvec_minmax_conv()  argument
2738 	/* write via temporary local uint for bounds-checking */  in do_proc_douintvec_minmax_conv()
2739 	unsigned int *up = write ? &tmp : valp;  in do_proc_douintvec_minmax_conv()
2741 	ret = do_proc_douintvec_conv(lvalp, up, write, data);  in do_proc_douintvec_minmax_conv()
2745 	if (write) {  in do_proc_douintvec_minmax_conv()
2759  * @write: %TRUE if this is a write to the sysctl file
2773  * Returns 0 on success or -ERANGE on write when the range check fails.
2775 int proc_douintvec_minmax(struct ctl_table *table, int write,  in proc_douintvec_minmax()  argument
2782 	return do_proc_douintvec(table, write, buffer, lenp, ppos,  in proc_douintvec_minmax()
2788 					int write, void *data)  in do_proc_dopipe_max_size_conv()  argument
2790 	if (write) {  in do_proc_dopipe_max_size_conv()
2806 static int proc_dopipe_max_size(struct ctl_table *table, int write,  in proc_dopipe_max_size()  argument
2809 	return do_proc_douintvec(table, write, buffer, lenp, ppos,  in proc_dopipe_max_size()
2827 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,  in proc_dointvec_minmax_coredump()  argument
2830 	int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);  in proc_dointvec_minmax_coredump()
2837 static int proc_dostring_coredump(struct ctl_table *table, int write,  in proc_dostring_coredump()  argument
2840 	int error = proc_dostring(table, write, buffer, lenp, ppos);  in proc_dostring_coredump()
2847 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,  in __do_proc_doulongvec_minmax()  argument
2858 	if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {  in __do_proc_doulongvec_minmax()
2869 	if (write) {  in __do_proc_doulongvec_minmax()
2883 		if (write) {  in __do_proc_doulongvec_minmax()
2916 	if (!write && !first && left && !err)  in __do_proc_doulongvec_minmax()
2918 	if (write && !err)  in __do_proc_doulongvec_minmax()
2920 	if (write) {  in __do_proc_doulongvec_minmax()
2931 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,  in do_proc_doulongvec_minmax()  argument
2937 	return __do_proc_doulongvec_minmax(table->data, table, write,  in do_proc_doulongvec_minmax()
2944  * @write: %TRUE if this is a write to the sysctl file
2957 int proc_doulongvec_minmax(struct ctl_table *table, int write,  in proc_doulongvec_minmax()  argument
2960     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);  in proc_doulongvec_minmax()
2966  * @write: %TRUE if this is a write to the sysctl file
2980 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,  in proc_doulongvec_ms_jiffies_minmax()  argument
2984     return do_proc_doulongvec_minmax(table, write, buffer,  in proc_doulongvec_ms_jiffies_minmax()
2991 					 int write, void *data)  in do_proc_dointvec_jiffies_conv()  argument
2993 	if (write) {  in do_proc_dointvec_jiffies_conv()
3014 						int write, void *data)  in do_proc_dointvec_userhz_jiffies_conv()  argument
3016 	if (write) {  in do_proc_dointvec_userhz_jiffies_conv()
3037 					    int write, void *data)  in do_proc_dointvec_ms_jiffies_conv()  argument
3039 	if (write) {  in do_proc_dointvec_ms_jiffies_conv()
3063  * @write: %TRUE if this is a write to the sysctl file
3075 int proc_dointvec_jiffies(struct ctl_table *table, int write,  in proc_dointvec_jiffies()  argument
3078     return do_proc_dointvec(table,write,buffer,lenp,ppos,  in proc_dointvec_jiffies()
3085  * @write: %TRUE if this is a write to the sysctl file
3097 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,  in proc_dointvec_userhz_jiffies()  argument
3100     return do_proc_dointvec(table,write,buffer,lenp,ppos,  in proc_dointvec_userhz_jiffies()
3107  * @write: %TRUE if this is a write to the sysctl file
3120 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,  in proc_dointvec_ms_jiffies()  argument
3123 	return do_proc_dointvec(table, write, buffer, lenp, ppos,  in proc_dointvec_ms_jiffies()
3127 static int proc_do_cad_pid(struct ctl_table *table, int write,  in proc_do_cad_pid()  argument
3136 	r = __do_proc_dointvec(&tmp, table, write, buffer,  in proc_do_cad_pid()
3138 	if (r || !write)  in proc_do_cad_pid()
3150  * proc_do_large_bitmap - read/write from/to a large bitmap
3152  * @write: %TRUE if this is a write to the sysctl file
3166 int proc_do_large_bitmap(struct ctl_table *table, int write,  in proc_do_large_bitmap()  argument
3177 	if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {  in proc_do_large_bitmap()
3182 	if (write) {  in proc_do_large_bitmap()
3300 		if (write) {  in proc_do_large_bitmap()
3316 int proc_dostring(struct ctl_table *table, int write,  in proc_dostring()  argument
3322 int proc_dointvec(struct ctl_table *table, int write,  in proc_dointvec()  argument
3328 int proc_douintvec(struct ctl_table *table, int write,  in proc_douintvec()  argument
3334 int proc_dointvec_minmax(struct ctl_table *table, int write,  in proc_dointvec_minmax()  argument
3340 int proc_douintvec_minmax(struct ctl_table *table, int write,  in proc_douintvec_minmax()  argument
3346 int proc_dointvec_jiffies(struct ctl_table *table, int write,  in proc_dointvec_jiffies()  argument
3352 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,  in proc_dointvec_userhz_jiffies()  argument
3358 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,  in proc_dointvec_ms_jiffies()  argument
3364 int proc_doulongvec_minmax(struct ctl_table *table, int write,  in proc_doulongvec_minmax()  argument
3370 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,  in proc_doulongvec_ms_jiffies_minmax()  argument
3377 int proc_do_large_bitmap(struct ctl_table *table, int write,  in proc_do_large_bitmap()  argument
3386 int proc_do_static_key(struct ctl_table *table, int write,  in proc_do_static_key()  argument
3401 	if (write && !capable(CAP_SYS_ADMIN))  in proc_do_static_key()
3406 	ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);  in proc_do_static_key()
3407 	if (write && !ret) {  in proc_do_static_key()