| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * sysctl.c: General linux system control interface |
| * |
| * Begun 24 March 1995, Stephen Tweedie |
| * Added /proc support, Dec 1995 |
| * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas. |
| * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver. |
| * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver. |
| * Dynamic registration fixes, Stephen Tweedie. |
| * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn. |
| * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris |
| * Horn. |
| * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer. |
| * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer. |
| * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill |
| * Wendling. |
| * The list_for_each() macro wasn't appropriate for the sysctl loop. |
| * Removed it and replaced it with older style, 03/23/00, Bill Wendling |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/mm.h> |
| #include <linux/swap.h> |
| #include <linux/slab.h> |
| #include <linux/sysctl.h> |
| #include <linux/bitmap.h> |
| #include <linux/signal.h> |
| #include <linux/panic.h> |
| #include <linux/printk.h> |
| #include <linux/proc_fs.h> |
| #include <linux/security.h> |
| #include <linux/ctype.h> |
| #include <linux/kmemleak.h> |
| #include <linux/filter.h> |
| #include <linux/fs.h> |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/kobject.h> |
| #include <linux/net.h> |
| #include <linux/sysrq.h> |
| #include <linux/highuid.h> |
| #include <linux/writeback.h> |
| #include <linux/ratelimit.h> |
| #include <linux/compaction.h> |
| #include <linux/hugetlb.h> |
| #include <linux/initrd.h> |
| #include <linux/key.h> |
| #include <linux/times.h> |
| #include <linux/limits.h> |
| #include <linux/dcache.h> |
| #include <linux/syscalls.h> |
| #include <linux/vmstat.h> |
| #include <linux/nfs_fs.h> |
| #include <linux/acpi.h> |
| #include <linux/reboot.h> |
| #include <linux/ftrace.h> |
| #include <linux/perf_event.h> |
| #include <linux/oom.h> |
| #include <linux/kmod.h> |
| #include <linux/capability.h> |
| #include <linux/binfmts.h> |
| #include <linux/sched/sysctl.h> |
| #include <linux/mount.h> |
| #include <linux/userfaultfd_k.h> |
| #include <linux/pid.h> |
| |
| #include "../lib/kstrtox.h" |
| |
| #include <linux/uaccess.h> |
| #include <asm/processor.h> |
| |
| #ifdef CONFIG_X86 |
| #include <asm/nmi.h> |
| #include <asm/stacktrace.h> |
| #include <asm/io.h> |
| #endif |
| #ifdef CONFIG_SPARC |
| #include <asm/setup.h> |
| #endif |
| #ifdef CONFIG_RT_MUTEXES |
| #include <linux/rtmutex.h> |
| #endif |
| |
| /* shared constants to be used in various sysctls */ |
| const int sysctl_vals[] = { 0, 1, 2, 3, 4, 100, 200, 1000, 3000, INT_MAX, 65535, -1 }; |
| EXPORT_SYMBOL(sysctl_vals); |
| |
| const unsigned long sysctl_long_vals[] = { 0, 1, LONG_MAX }; |
| EXPORT_SYMBOL_GPL(sysctl_long_vals); |
| |
| #if defined(CONFIG_SYSCTL) |
| |
| /* Constants used for minimum and maximum */ |
| |
| #ifdef CONFIG_PERF_EVENTS |
| static const int six_hundred_forty_kb = 640 * 1024; |
| #endif |
| |
| |
| static const int ngroups_max = NGROUPS_MAX; |
| static const int cap_last_cap = CAP_LAST_CAP; |
| |
| #ifdef CONFIG_PROC_SYSCTL |
| |
| /** |
| * enum sysctl_writes_mode - supported sysctl write modes |
| * |
| * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value |
| * to be written, and multiple writes on the same sysctl file descriptor |
| * will rewrite the sysctl value, regardless of file position. No warning |
| * is issued when the initial position is not 0. |
| * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is |
| * not 0. |
| * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at |
| * file position 0 and the value must be fully contained in the buffer |
| * sent to the write syscall. If dealing with strings respect the file |
| * position, but restrict this to the max length of the buffer, anything |
| * passed the max length will be ignored. Multiple writes will append |
| * to the buffer. |
| * |
| * These write modes control how current file position affects the behavior of |
| * updating sysctl values through the proc interface on each write. |
| */ |
| enum sysctl_writes_mode { |
| SYSCTL_WRITES_LEGACY = -1, |
| SYSCTL_WRITES_WARN = 0, |
| SYSCTL_WRITES_STRICT = 1, |
| }; |
| |
| static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT; |
| #endif /* CONFIG_PROC_SYSCTL */ |
| |
| #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \ |
| defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT) |
| int sysctl_legacy_va_layout; |
| #endif |
| |
| #endif /* CONFIG_SYSCTL */ |
| |
| /* |
| * /proc/sys support |
| */ |
| |
| #ifdef CONFIG_PROC_SYSCTL |
| |
| static int _proc_do_string(char *data, int maxlen, int write, |
| char *buffer, size_t *lenp, loff_t *ppos) |
| { |
| size_t len; |
| char c, *p; |
| |
| if (!data || !maxlen || !*lenp) { |
| *lenp = 0; |
| return 0; |
| } |
| |
| if (write) { |
| if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) { |
| /* Only continue writes not past the end of buffer. */ |
| len = strlen(data); |
| if (len > maxlen - 1) |
| len = maxlen - 1; |
| |
| if (*ppos > len) |
| return 0; |
| len = *ppos; |
| } else { |
| /* Start writing from beginning of buffer. */ |
| len = 0; |
| } |
| |
| *ppos += *lenp; |
| p = buffer; |
| while ((p - buffer) < *lenp && len < maxlen - 1) { |
| c = *(p++); |
| if (c == 0 || c == '\n') |
| break; |
| data[len++] = c; |
| } |
| data[len] = 0; |
| } else { |
| len = strlen(data); |
| if (len > maxlen) |
| len = maxlen; |
| |
| if (*ppos > len) { |
| *lenp = 0; |
| return 0; |
| } |
| |
| data += *ppos; |
| len -= *ppos; |
| |
| if (len > *lenp) |
| len = *lenp; |
| if (len) |
| memcpy(buffer, data, len); |
| if (len < *lenp) { |
| buffer[len] = '\n'; |
| len++; |
| } |
| *lenp = len; |
| *ppos += len; |
| } |
| return 0; |
| } |
| |
| static void warn_sysctl_write(struct ctl_table *table) |
| { |
| pr_warn_once("%s wrote to %s when file position was not 0!\n" |
| "This will not be supported in the future. To silence this\n" |
| "warning, set kernel.sysctl_writes_strict = -1\n", |
| current->comm, table->procname); |
| } |
| |
| /** |
| * proc_first_pos_non_zero_ignore - check if first position is allowed |
| * @ppos: file position |
| * @table: the sysctl table |
| * |
| * Returns true if the first position is non-zero and the sysctl_writes_strict |
| * mode indicates this is not allowed for numeric input types. String proc |
| * handlers can ignore the return value. |
| */ |
| static bool proc_first_pos_non_zero_ignore(loff_t *ppos, |
| struct ctl_table *table) |
| { |
| if (!*ppos) |
| return false; |
| |
| switch (sysctl_writes_strict) { |
| case SYSCTL_WRITES_STRICT: |
| return true; |
| case SYSCTL_WRITES_WARN: |
| warn_sysctl_write(table); |
| return false; |
| default: |
| return false; |
| } |
| } |
| |
| /** |
| * proc_dostring - read a string sysctl |
| * @table: the sysctl table |
| * @write: %TRUE if this is a write to the sysctl file |
| * @buffer: the user buffer |
| * @lenp: the size of the user buffer |
| * @ppos: file position |
| * |
| * Reads/writes a string from/to the user buffer. If the kernel |
| * buffer provided is not large enough to hold the string, the |
| * string is truncated. The copied string is %NULL-terminated. |
| * If the string is being read by the user process, it is copied |
| * and a newline '\n' is added. It is truncated if the buffer is |
| * not large enough. |
| * |
| * Returns 0 on success. |
| */ |
| int proc_dostring(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| if (write) |
| proc_first_pos_non_zero_ignore(ppos, table); |
| |
| return _proc_do_string(table->data, table->maxlen, write, buffer, lenp, |
| ppos); |
| } |
| |
| static size_t proc_skip_spaces(char **buf) |
| { |
| size_t ret; |
| char *tmp = skip_spaces(*buf); |
| ret = tmp - *buf; |
| *buf = tmp; |
| return ret; |
| } |
| |
| static void proc_skip_char(char **buf, size_t *size, const char v) |
| { |
| while (*size) { |
| if (**buf != v) |
| break; |
| (*size)--; |
| (*buf)++; |
| } |
| } |
| |
| /** |
| * strtoul_lenient - parse an ASCII formatted integer from a buffer and only |
| * fail on overflow |
| * |
| * @cp: kernel buffer containing the string to parse |
| * @endp: pointer to store the trailing characters |
| * @base: the base to use |
| * @res: where the parsed integer will be stored |
| * |
| * In case of success 0 is returned and @res will contain the parsed integer, |
| * @endp will hold any trailing characters. |
| * This function will fail the parse on overflow. If there wasn't an overflow |
| * the function will defer the decision what characters count as invalid to the |
| * caller. |
| */ |
| static int strtoul_lenient(const char *cp, char **endp, unsigned int base, |
| unsigned long *res) |
| { |
| unsigned long long result; |
| unsigned int rv; |
| |
| cp = _parse_integer_fixup_radix(cp, &base); |
| rv = _parse_integer(cp, base, &result); |
| if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result)) |
| return -ERANGE; |
| |
| cp += rv; |
| |
| if (endp) |
| *endp = (char *)cp; |
| |
| *res = (unsigned long)result; |
| return 0; |
| } |
| |
| #define TMPBUFLEN 22 |
| /** |
| * proc_get_long - reads an ASCII formatted integer from a user buffer |
| * |
| * @buf: a kernel buffer |
| * @size: size of the kernel buffer |
| * @val: this is where the number will be stored |
| * @neg: set to %TRUE if number is negative |
| * @perm_tr: a vector which contains the allowed trailers |
| * @perm_tr_len: size of the perm_tr vector |
| * @tr: pointer to store the trailer character |
| * |
| * In case of success %0 is returned and @buf and @size are updated with |
| * the amount of bytes read. If @tr is non-NULL and a trailing |
| * character exists (size is non-zero after returning from this |
| * function), @tr is updated with the trailing character. |
| */ |
| static int proc_get_long(char **buf, size_t *size, |
| unsigned long *val, bool *neg, |
| const char *perm_tr, unsigned perm_tr_len, char *tr) |
| { |
| int len; |
| char *p, tmp[TMPBUFLEN]; |
| |
| if (!*size) |
| return -EINVAL; |
| |
| len = *size; |
| if (len > TMPBUFLEN - 1) |
| len = TMPBUFLEN - 1; |
| |
| memcpy(tmp, *buf, len); |
| |
| tmp[len] = 0; |
| p = tmp; |
| if (*p == '-' && *size > 1) { |
| *neg = true; |
| p++; |
| } else |
| *neg = false; |
| if (!isdigit(*p)) |
| return -EINVAL; |
| |
| if (strtoul_lenient(p, &p, 0, val)) |
| return -EINVAL; |
| |
| len = p - tmp; |
| |
| /* We don't know if the next char is whitespace thus we may accept |
| * invalid integers (e.g. 1234...a) or two integers instead of one |
| * (e.g. 123...1). So lets not allow such large numbers. */ |
| if (len == TMPBUFLEN - 1) |
| return -EINVAL; |
| |
| if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) |
| return -EINVAL; |
| |
| if (tr && (len < *size)) |
| *tr = *p; |
| |
| *buf += len; |
| *size -= len; |
| |
| return 0; |
| } |
| |
| /** |
| * proc_put_long - converts an integer to a decimal ASCII formatted string |
| * |
| * @buf: the user buffer |
| * @size: the size of the user buffer |
| * @val: the integer to be converted |
| * @neg: sign of the number, %TRUE for negative |
| * |
| * In case of success @buf and @size are updated with the amount of bytes |
| * written. |
| */ |
| static void proc_put_long(void **buf, size_t *size, unsigned long val, bool neg) |
| { |
| int len; |
| char tmp[TMPBUFLEN], *p = tmp; |
| |
| sprintf(p, "%s%lu", neg ? "-" : "", val); |
| len = strlen(tmp); |
| if (len > *size) |
| len = *size; |
| memcpy(*buf, tmp, len); |
| *size -= len; |
| *buf += len; |
| } |
| #undef TMPBUFLEN |
| |
| static void proc_put_char(void **buf, size_t *size, char c) |
| { |
| if (*size) { |
| char **buffer = (char **)buf; |
| **buffer = c; |
| |
| (*size)--; |
| (*buffer)++; |
| *buf = *buffer; |
| } |
| } |
| |
| static int do_proc_dobool_conv(bool *negp, unsigned long *lvalp, |
| int *valp, |
| int write, void *data) |
| { |
| if (write) { |
| *(bool *)valp = *lvalp; |
| } else { |
| int val = *(bool *)valp; |
| |
| *lvalp = (unsigned long)val; |
| *negp = false; |
| } |
| return 0; |
| } |
| |
| static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, |
| int *valp, |
| int write, void *data) |
| { |
| if (write) { |
| if (*negp) { |
| if (*lvalp > (unsigned long) INT_MAX + 1) |
| return -EINVAL; |
| WRITE_ONCE(*valp, -*lvalp); |
| } else { |
| if (*lvalp > (unsigned long) INT_MAX) |
| return -EINVAL; |
| WRITE_ONCE(*valp, *lvalp); |
| } |
| } else { |
| int val = READ_ONCE(*valp); |
| if (val < 0) { |
| *negp = true; |
| *lvalp = -(unsigned long)val; |
| } else { |
| *negp = false; |
| *lvalp = (unsigned long)val; |
| } |
| } |
| return 0; |
| } |
| |
| static int do_proc_douintvec_conv(unsigned long *lvalp, |
| unsigned int *valp, |
| int write, void *data) |
| { |
| if (write) { |
| if (*lvalp > UINT_MAX) |
| return -EINVAL; |
| WRITE_ONCE(*valp, *lvalp); |
| } else { |
| unsigned int val = READ_ONCE(*valp); |
| *lvalp = (unsigned long)val; |
| } |
| return 0; |
| } |
| |
| static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; |
| |
| static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, |
| int write, void *buffer, |
| size_t *lenp, loff_t *ppos, |
| int (*conv)(bool *negp, unsigned long *lvalp, int *valp, |
| int write, void *data), |
| void *data) |
| { |
| int *i, vleft, first = 1, err = 0; |
| size_t left; |
| char *p; |
| |
| if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { |
| *lenp = 0; |
| return 0; |
| } |
| |
| i = (int *) tbl_data; |
| vleft = table->maxlen / sizeof(*i); |
| left = *lenp; |
| |
| if (!conv) |
| conv = do_proc_dointvec_conv; |
| |
| if (write) { |
| if (proc_first_pos_non_zero_ignore(ppos, table)) |
| goto out; |
| |
| if (left > PAGE_SIZE - 1) |
| left = PAGE_SIZE - 1; |
| p = buffer; |
| } |
| |
| for (; left && vleft--; i++, first=0) { |
| unsigned long lval; |
| bool neg; |
| |
| if (write) { |
| left -= proc_skip_spaces(&p); |
| |
| if (!left) |
| break; |
| err = proc_get_long(&p, &left, &lval, &neg, |
| proc_wspace_sep, |
| sizeof(proc_wspace_sep), NULL); |
| if (err) |
| break; |
| if (conv(&neg, &lval, i, 1, data)) { |
| err = -EINVAL; |
| break; |
| } |
| } else { |
| if (conv(&neg, &lval, i, 0, data)) { |
| err = -EINVAL; |
| break; |
| } |
| if (!first) |
| proc_put_char(&buffer, &left, '\t'); |
| proc_put_long(&buffer, &left, lval, neg); |
| } |
| } |
| |
| if (!write && !first && left && !err) |
| proc_put_char(&buffer, &left, '\n'); |
| if (write && !err && left) |
| left -= proc_skip_spaces(&p); |
| if (write && first) |
| return err ? : -EINVAL; |
| *lenp -= left; |
| out: |
| *ppos += *lenp; |
| return err; |
| } |
| |
| static int do_proc_dointvec(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos, |
| int (*conv)(bool *negp, unsigned long *lvalp, int *valp, |
| int write, void *data), |
| void *data) |
| { |
| return __do_proc_dointvec(table->data, table, write, |
| buffer, lenp, ppos, conv, data); |
| } |
| |
| static int do_proc_douintvec_w(unsigned int *tbl_data, |
| struct ctl_table *table, |
| void *buffer, |
| size_t *lenp, loff_t *ppos, |
| int (*conv)(unsigned long *lvalp, |
| unsigned int *valp, |
| int write, void *data), |
| void *data) |
| { |
| unsigned long lval; |
| int err = 0; |
| size_t left; |
| bool neg; |
| char *p = buffer; |
| |
| left = *lenp; |
| |
| if (proc_first_pos_non_zero_ignore(ppos, table)) |
| goto bail_early; |
| |
| if (left > PAGE_SIZE - 1) |
| left = PAGE_SIZE - 1; |
| |
| left -= proc_skip_spaces(&p); |
| if (!left) { |
| err = -EINVAL; |
| goto out_free; |
| } |
| |
| err = proc_get_long(&p, &left, &lval, &neg, |
| proc_wspace_sep, |
| sizeof(proc_wspace_sep), NULL); |
| if (err || neg) { |
| err = -EINVAL; |
| goto out_free; |
| } |
| |
| if (conv(&lval, tbl_data, 1, data)) { |
| err = -EINVAL; |
| goto out_free; |
| } |
| |
| if (!err && left) |
| left -= proc_skip_spaces(&p); |
| |
| out_free: |
| if (err) |
| return -EINVAL; |
| |
| return 0; |
| |
| /* This is in keeping with old __do_proc_dointvec() */ |
| bail_early: |
| *ppos += *lenp; |
| return err; |
| } |
| |
| static int do_proc_douintvec_r(unsigned int *tbl_data, void *buffer, |
| size_t *lenp, loff_t *ppos, |
| int (*conv)(unsigned long *lvalp, |
| unsigned int *valp, |
| int write, void *data), |
| void *data) |
| { |
| unsigned long lval; |
| int err = 0; |
| size_t left; |
| |
| left = *lenp; |
| |
| if (conv(&lval, tbl_data, 0, data)) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| proc_put_long(&buffer, &left, lval, false); |
| if (!left) |
| goto out; |
| |
| proc_put_char(&buffer, &left, '\n'); |
| |
| out: |
| *lenp -= left; |
| *ppos += *lenp; |
| |
| return err; |
| } |
| |
| static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table, |
| int write, void *buffer, |
| size_t *lenp, loff_t *ppos, |
| int (*conv)(unsigned long *lvalp, |
| unsigned int *valp, |
| int write, void *data), |
| void *data) |
| { |
| unsigned int *i, vleft; |
| |
| if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { |
| *lenp = 0; |
| return 0; |
| } |
| |
| i = (unsigned int *) tbl_data; |
| vleft = table->maxlen / sizeof(*i); |
| |
| /* |
| * Arrays are not supported, keep this simple. *Do not* add |
| * support for them. |
| */ |
| if (vleft != 1) { |
| *lenp = 0; |
| return -EINVAL; |
| } |
| |
| if (!conv) |
| conv = do_proc_douintvec_conv; |
| |
| if (write) |
| return do_proc_douintvec_w(i, table, buffer, lenp, ppos, |
| conv, data); |
| return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data); |
| } |
| |
| int do_proc_douintvec(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos, |
| int (*conv)(unsigned long *lvalp, |
| unsigned int *valp, |
| int write, void *data), |
| void *data) |
| { |
| return __do_proc_douintvec(table->data, table, write, |
| buffer, lenp, ppos, conv, data); |
| } |
| |
| /** |
| * proc_dobool - read/write a bool |
| * @table: the sysctl table |
| * @write: %TRUE if this is a write to the sysctl file |
| * @buffer: the user buffer |
| * @lenp: the size of the user buffer |
| * @ppos: file position |
| * |
| * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
| * values from/to the user buffer, treated as an ASCII string. |
| * |
| * Returns 0 on success. |
| */ |
| int proc_dobool(struct ctl_table *table, int write, void *buffer, |
| size_t *lenp, loff_t *ppos) |
| { |
| return do_proc_dointvec(table, write, buffer, lenp, ppos, |
| do_proc_dobool_conv, NULL); |
| } |
| |
| /** |
| * proc_dointvec - read a vector of integers |
| * @table: the sysctl table |
| * @write: %TRUE if this is a write to the sysctl file |
| * @buffer: the user buffer |
| * @lenp: the size of the user buffer |
| * @ppos: file position |
| * |
| * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
| * values from/to the user buffer, treated as an ASCII string. |
| * |
| * Returns 0 on success. |
| */ |
| int proc_dointvec(struct ctl_table *table, int write, void *buffer, |
| size_t *lenp, loff_t *ppos) |
| { |
| return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL); |
| } |
| |
| #ifdef CONFIG_COMPACTION |
| static int proc_dointvec_minmax_warn_RT_change(struct ctl_table *table, |
| int write, void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| int ret, old; |
| |
| if (!IS_ENABLED(CONFIG_PREEMPT_RT) || !write) |
| return proc_dointvec_minmax(table, write, buffer, lenp, ppos); |
| |
| old = *(int *)table->data; |
| ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); |
| if (ret) |
| return ret; |
| if (old != *(int *)table->data) |
| pr_warn_once("sysctl attribute %s changed by %s[%d]\n", |
| table->procname, current->comm, |
| task_pid_nr(current)); |
| return ret; |
| } |
| #endif |
| |
| /** |
| * proc_douintvec - read a vector of unsigned integers |
| * @table: the sysctl table |
| * @write: %TRUE if this is a write to the sysctl file |
| * @buffer: the user buffer |
| * @lenp: the size of the user buffer |
| * @ppos: file position |
| * |
| * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer |
| * values from/to the user buffer, treated as an ASCII string. |
| * |
| * Returns 0 on success. |
| */ |
| int proc_douintvec(struct ctl_table *table, int write, void *buffer, |
| size_t *lenp, loff_t *ppos) |
| { |
| return do_proc_douintvec(table, write, buffer, lenp, ppos, |
| do_proc_douintvec_conv, NULL); |
| } |
| |
| /* |
| * Taint values can only be increased |
| * This means we can safely use a temporary. |
| */ |
| static int proc_taint(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| struct ctl_table t; |
| unsigned long tmptaint = get_taint(); |
| int err; |
| |
| if (write && !capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| |
| t = *table; |
| t.data = &tmptaint; |
| err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); |
| if (err < 0) |
| return err; |
| |
| if (write) { |
| int i; |
| |
| /* |
| * If we are relying on panic_on_taint not producing |
| * false positives due to userspace input, bail out |
| * before setting the requested taint flags. |
| */ |
| if (panic_on_taint_nousertaint && (tmptaint & panic_on_taint)) |
| return -EINVAL; |
| |
| /* |
| * Poor man's atomic or. Not worth adding a primitive |
| * to everyone's atomic.h for this |
| */ |
| for (i = 0; i < TAINT_FLAGS_COUNT; i++) |
| if ((1UL << i) & tmptaint) |
| add_taint(i, LOCKDEP_STILL_OK); |
| } |
| |
| return err; |
| } |
| |
| /** |
| * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure |
| * @min: pointer to minimum allowable value |
| * @max: pointer to maximum allowable value |
| * |
| * The do_proc_dointvec_minmax_conv_param structure provides the |
| * minimum and maximum values for doing range checking for those sysctl |
| * parameters that use the proc_dointvec_minmax() handler. |
| */ |
| struct do_proc_dointvec_minmax_conv_param { |
| int *min; |
| int *max; |
| }; |
| |
| static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, |
| int *valp, |
| int write, void *data) |
| { |
| int tmp, ret; |
| struct do_proc_dointvec_minmax_conv_param *param = data; |
| /* |
| * If writing, first do so via a temporary local int so we can |
| * bounds-check it before touching *valp. |
| */ |
| int *ip = write ? &tmp : valp; |
| |
| ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data); |
| if (ret) |
| return ret; |
| |
| if (write) { |
| if ((param->min && *param->min > tmp) || |
| (param->max && *param->max < tmp)) |
| return -EINVAL; |
| WRITE_ONCE(*valp, tmp); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * proc_dointvec_minmax - read a vector of integers with min/max values |
| * @table: the sysctl table |
| * @write: %TRUE if this is a write to the sysctl file |
| * @buffer: the user buffer |
| * @lenp: the size of the user buffer |
| * @ppos: file position |
| * |
| * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
| * values from/to the user buffer, treated as an ASCII string. |
| * |
| * This routine will ensure the values are within the range specified by |
| * table->extra1 (min) and table->extra2 (max). |
| * |
| * Returns 0 on success or -EINVAL on write when the range check fails. |
| */ |
| int proc_dointvec_minmax(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| struct do_proc_dointvec_minmax_conv_param param = { |
| .min = (int *) table->extra1, |
| .max = (int *) table->extra2, |
| }; |
| return do_proc_dointvec(table, write, buffer, lenp, ppos, |
| do_proc_dointvec_minmax_conv, ¶m); |
| } |
| |
| /** |
| * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure |
| * @min: pointer to minimum allowable value |
| * @max: pointer to maximum allowable value |
| * |
| * The do_proc_douintvec_minmax_conv_param structure provides the |
| * minimum and maximum values for doing range checking for those sysctl |
| * parameters that use the proc_douintvec_minmax() handler. |
| */ |
| struct do_proc_douintvec_minmax_conv_param { |
| unsigned int *min; |
| unsigned int *max; |
| }; |
| |
| static int do_proc_douintvec_minmax_conv(unsigned long *lvalp, |
| unsigned int *valp, |
| int write, void *data) |
| { |
| int ret; |
| unsigned int tmp; |
| struct do_proc_douintvec_minmax_conv_param *param = data; |
| /* write via temporary local uint for bounds-checking */ |
| unsigned int *up = write ? &tmp : valp; |
| |
| ret = do_proc_douintvec_conv(lvalp, up, write, data); |
| if (ret) |
| return ret; |
| |
| if (write) { |
| if ((param->min && *param->min > tmp) || |
| (param->max && *param->max < tmp)) |
| return -ERANGE; |
| |
| WRITE_ONCE(*valp, tmp); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * proc_douintvec_minmax - read a vector of unsigned ints with min/max values |
| * @table: the sysctl table |
| * @write: %TRUE if this is a write to the sysctl file |
| * @buffer: the user buffer |
| * @lenp: the size of the user buffer |
| * @ppos: file position |
| * |
| * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer |
| * values from/to the user buffer, treated as an ASCII string. Negative |
| * strings are not allowed. |
| * |
| * This routine will ensure the values are within the range specified by |
| * table->extra1 (min) and table->extra2 (max). There is a final sanity |
| * check for UINT_MAX to avoid having to support wrap around uses from |
| * userspace. |
| * |
| * Returns 0 on success or -ERANGE on write when the range check fails. |
| */ |
| int proc_douintvec_minmax(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| struct do_proc_douintvec_minmax_conv_param param = { |
| .min = (unsigned int *) table->extra1, |
| .max = (unsigned int *) table->extra2, |
| }; |
| return do_proc_douintvec(table, write, buffer, lenp, ppos, |
| do_proc_douintvec_minmax_conv, ¶m); |
| } |
| |
| /** |
| * proc_dou8vec_minmax - read a vector of unsigned chars with min/max values |
| * @table: the sysctl table |
| * @write: %TRUE if this is a write to the sysctl file |
| * @buffer: the user buffer |
| * @lenp: the size of the user buffer |
| * @ppos: file position |
| * |
| * Reads/writes up to table->maxlen/sizeof(u8) unsigned chars |
| * values from/to the user buffer, treated as an ASCII string. Negative |
| * strings are not allowed. |
| * |
| * This routine will ensure the values are within the range specified by |
| * table->extra1 (min) and table->extra2 (max). |
| * |
| * Returns 0 on success or an error on write when the range check fails. |
| */ |
| int proc_dou8vec_minmax(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| struct ctl_table tmp; |
| unsigned int min = 0, max = 255U, val; |
| u8 *data = table->data; |
| struct do_proc_douintvec_minmax_conv_param param = { |
| .min = &min, |
| .max = &max, |
| }; |
| int res; |
| |
| /* Do not support arrays yet. */ |
| if (table->maxlen != sizeof(u8)) |
| return -EINVAL; |
| |
| if (table->extra1) { |
| min = *(unsigned int *) table->extra1; |
| if (min > 255U) |
| return -EINVAL; |
| } |
| if (table->extra2) { |
| max = *(unsigned int *) table->extra2; |
| if (max > 255U) |
| return -EINVAL; |
| } |
| |
| tmp = *table; |
| |
| tmp.maxlen = sizeof(val); |
| tmp.data = &val; |
| val = READ_ONCE(*data); |
| res = do_proc_douintvec(&tmp, write, buffer, lenp, ppos, |
| do_proc_douintvec_minmax_conv, ¶m); |
| if (res) |
| return res; |
| if (write) |
| WRITE_ONCE(*data, val); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(proc_dou8vec_minmax); |
| |
| #ifdef CONFIG_MAGIC_SYSRQ |
| static int sysrq_sysctl_handler(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| int tmp, ret; |
| |
| tmp = sysrq_mask(); |
| |
| ret = __do_proc_dointvec(&tmp, table, write, buffer, |
| lenp, ppos, NULL, NULL); |
| if (ret || !write) |
| return ret; |
| |
| if (write) |
| sysrq_toggle_support(tmp); |
| |
| return 0; |
| } |
| #endif |
| |
| static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, |
| int write, void *buffer, size_t *lenp, loff_t *ppos, |
| unsigned long convmul, unsigned long convdiv) |
| { |
| unsigned long *i, *min, *max; |
| int vleft, first = 1, err = 0; |
| size_t left; |
| char *p; |
| |
| if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { |
| *lenp = 0; |
| return 0; |
| } |
| |
| i = data; |
| min = table->extra1; |
| max = table->extra2; |
| vleft = table->maxlen / sizeof(unsigned long); |
| left = *lenp; |
| |
| if (write) { |
| if (proc_first_pos_non_zero_ignore(ppos, table)) |
| goto out; |
| |
| if (left > PAGE_SIZE - 1) |
| left = PAGE_SIZE - 1; |
| p = buffer; |
| } |
| |
| for (; left && vleft--; i++, first = 0) { |
| unsigned long val; |
| |
| if (write) { |
| bool neg; |
| |
| left -= proc_skip_spaces(&p); |
| if (!left) |
| break; |
| |
| err = proc_get_long(&p, &left, &val, &neg, |
| proc_wspace_sep, |
| sizeof(proc_wspace_sep), NULL); |
| if (err || neg) { |
| err = -EINVAL; |
| break; |
| } |
| |
| val = convmul * val / convdiv; |
| if ((min && val < *min) || (max && val > *max)) { |
| err = -EINVAL; |
| break; |
| } |
| WRITE_ONCE(*i, val); |
| } else { |
| val = convdiv * READ_ONCE(*i) / convmul; |
| if (!first) |
| proc_put_char(&buffer, &left, '\t'); |
| proc_put_long(&buffer, &left, val, false); |
| } |
| } |
| |
| if (!write && !first && left && !err) |
| proc_put_char(&buffer, &left, '\n'); |
| if (write && !err) |
| left -= proc_skip_spaces(&p); |
| if (write && first) |
| return err ? : -EINVAL; |
| *lenp -= left; |
| out: |
| *ppos += *lenp; |
| return err; |
| } |
| |
| static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos, unsigned long convmul, |
| unsigned long convdiv) |
| { |
| return __do_proc_doulongvec_minmax(table->data, table, write, |
| buffer, lenp, ppos, convmul, convdiv); |
| } |
| |
| /** |
| * proc_doulongvec_minmax - read a vector of long integers with min/max values |
| * @table: the sysctl table |
| * @write: %TRUE if this is a write to the sysctl file |
| * @buffer: the user buffer |
| * @lenp: the size of the user buffer |
| * @ppos: file position |
| * |
| * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long |
| * values from/to the user buffer, treated as an ASCII string. |
| * |
| * This routine will ensure the values are within the range specified by |
| * table->extra1 (min) and table->extra2 (max). |
| * |
| * Returns 0 on success. |
| */ |
| int proc_doulongvec_minmax(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); |
| } |
| |
| /** |
| * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values |
| * @table: the sysctl table |
| * @write: %TRUE if this is a write to the sysctl file |
| * @buffer: the user buffer |
| * @lenp: the size of the user buffer |
| * @ppos: file position |
| * |
| * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long |
| * values from/to the user buffer, treated as an ASCII string. The values |
| * are treated as milliseconds, and converted to jiffies when they are stored. |
| * |
| * This routine will ensure the values are within the range specified by |
| * table->extra1 (min) and table->extra2 (max). |
| * |
| * Returns 0 on success. |
| */ |
| int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return do_proc_doulongvec_minmax(table, write, buffer, |
| lenp, ppos, HZ, 1000l); |
| } |
| |
| |
| static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, |
| int *valp, |
| int write, void *data) |
| { |
| if (write) { |
| if (*lvalp > INT_MAX / HZ) |
| return 1; |
| if (*negp) |
| WRITE_ONCE(*valp, -*lvalp * HZ); |
| else |
| WRITE_ONCE(*valp, *lvalp * HZ); |
| } else { |
| int val = READ_ONCE(*valp); |
| unsigned long lval; |
| if (val < 0) { |
| *negp = true; |
| lval = -(unsigned long)val; |
| } else { |
| *negp = false; |
| lval = (unsigned long)val; |
| } |
| *lvalp = lval / HZ; |
| } |
| return 0; |
| } |
| |
| static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, |
| int *valp, |
| int write, void *data) |
| { |
| if (write) { |
| if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) |
| return 1; |
| *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); |
| } else { |
| int val = *valp; |
| unsigned long lval; |
| if (val < 0) { |
| *negp = true; |
| lval = -(unsigned long)val; |
| } else { |
| *negp = false; |
| lval = (unsigned long)val; |
| } |
| *lvalp = jiffies_to_clock_t(lval); |
| } |
| return 0; |
| } |
| |
| static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, |
| int *valp, |
| int write, void *data) |
| { |
| if (write) { |
| unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); |
| |
| if (jif > INT_MAX) |
| return 1; |
| WRITE_ONCE(*valp, (int)jif); |
| } else { |
| int val = READ_ONCE(*valp); |
| unsigned long lval; |
| if (val < 0) { |
| *negp = true; |
| lval = -(unsigned long)val; |
| } else { |
| *negp = false; |
| lval = (unsigned long)val; |
| } |
| *lvalp = jiffies_to_msecs(lval); |
| } |
| return 0; |
| } |
| |
| static int do_proc_dointvec_ms_jiffies_minmax_conv(bool *negp, unsigned long *lvalp, |
| int *valp, int write, void *data) |
| { |
| int tmp, ret; |
| struct do_proc_dointvec_minmax_conv_param *param = data; |
| /* |
| * If writing, first do so via a temporary local int so we can |
| * bounds-check it before touching *valp. |
| */ |
| int *ip = write ? &tmp : valp; |
| |
| ret = do_proc_dointvec_ms_jiffies_conv(negp, lvalp, ip, write, data); |
| if (ret) |
| return ret; |
| |
| if (write) { |
| if ((param->min && *param->min > tmp) || |
| (param->max && *param->max < tmp)) |
| return -EINVAL; |
| *valp = tmp; |
| } |
| return 0; |
| } |
| |
| /** |
| * proc_dointvec_jiffies - read a vector of integers as seconds |
| * @table: the sysctl table |
| * @write: %TRUE if this is a write to the sysctl file |
| * @buffer: the user buffer |
| * @lenp: the size of the user buffer |
| * @ppos: file position |
| * |
| * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
| * values from/to the user buffer, treated as an ASCII string. |
| * The values read are assumed to be in seconds, and are converted into |
| * jiffies. |
| * |
| * Returns 0 on success. |
| */ |
| int proc_dointvec_jiffies(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return do_proc_dointvec(table,write,buffer,lenp,ppos, |
| do_proc_dointvec_jiffies_conv,NULL); |
| } |
| |
| int proc_dointvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| struct do_proc_dointvec_minmax_conv_param param = { |
| .min = (int *) table->extra1, |
| .max = (int *) table->extra2, |
| }; |
| return do_proc_dointvec(table, write, buffer, lenp, ppos, |
| do_proc_dointvec_ms_jiffies_minmax_conv, ¶m); |
| } |
| |
| /** |
| * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds |
| * @table: the sysctl table |
| * @write: %TRUE if this is a write to the sysctl file |
| * @buffer: the user buffer |
| * @lenp: the size of the user buffer |
| * @ppos: pointer to the file position |
| * |
| * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
| * values from/to the user buffer, treated as an ASCII string. |
| * The values read are assumed to be in 1/USER_HZ seconds, and |
| * are converted into jiffies. |
| * |
| * Returns 0 on success. |
| */ |
| int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return do_proc_dointvec(table, write, buffer, lenp, ppos, |
| do_proc_dointvec_userhz_jiffies_conv, NULL); |
| } |
| |
| /** |
| * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds |
| * @table: the sysctl table |
| * @write: %TRUE if this is a write to the sysctl file |
| * @buffer: the user buffer |
| * @lenp: the size of the user buffer |
| * @ppos: file position |
| * @ppos: the current position in the file |
| * |
| * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
| * values from/to the user buffer, treated as an ASCII string. |
| * The values read are assumed to be in 1/1000 seconds, and |
| * are converted into jiffies. |
| * |
| * Returns 0 on success. |
| */ |
| int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, void *buffer, |
| size_t *lenp, loff_t *ppos) |
| { |
| return do_proc_dointvec(table, write, buffer, lenp, ppos, |
| do_proc_dointvec_ms_jiffies_conv, NULL); |
| } |
| |
| static int proc_do_cad_pid(struct ctl_table *table, int write, void *buffer, |
| size_t *lenp, loff_t *ppos) |
| { |
| struct pid *new_pid; |
| pid_t tmp; |
| int r; |
| |
| tmp = pid_vnr(cad_pid); |
| |
| r = __do_proc_dointvec(&tmp, table, write, buffer, |
| lenp, ppos, NULL, NULL); |
| if (r || !write) |
| return r; |
| |
| new_pid = find_get_pid(tmp); |
| if (!new_pid) |
| return -ESRCH; |
| |
| put_pid(xchg(&cad_pid, new_pid)); |
| return 0; |
| } |
| |
| /** |
| * proc_do_large_bitmap - read/write from/to a large bitmap |
| * @table: the sysctl table |
| * @write: %TRUE if this is a write to the sysctl file |
| * @buffer: the user buffer |
| * @lenp: the size of the user buffer |
| * @ppos: file position |
| * |
| * The bitmap is stored at table->data and the bitmap length (in bits) |
| * in table->maxlen. |
| * |
| * We use a range comma separated format (e.g. 1,3-4,10-10) so that |
| * large bitmaps may be represented in a compact manner. Writing into |
| * the file will clear the bitmap then update it with the given input. |
| * |
| * Returns 0 on success. |
| */ |
| int proc_do_large_bitmap(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| int err = 0; |
| size_t left = *lenp; |
| unsigned long bitmap_len = table->maxlen; |
| unsigned long *bitmap = *(unsigned long **) table->data; |
| unsigned long *tmp_bitmap = NULL; |
| char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; |
| |
| if (!bitmap || !bitmap_len || !left || (*ppos && !write)) { |
| *lenp = 0; |
| return 0; |
| } |
| |
| if (write) { |
| char *p = buffer; |
| size_t skipped = 0; |
| |
| if (left > PAGE_SIZE - 1) { |
| left = PAGE_SIZE - 1; |
| /* How much of the buffer we'll skip this pass */ |
| skipped = *lenp - left; |
| } |
| |
| tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL); |
| if (!tmp_bitmap) |
| return -ENOMEM; |
| proc_skip_char(&p, &left, '\n'); |
| while (!err && left) { |
| unsigned long val_a, val_b; |
| bool neg; |
| size_t saved_left; |
| |
| /* In case we stop parsing mid-number, we can reset */ |
| saved_left = left; |
| err = proc_get_long(&p, &left, &val_a, &neg, tr_a, |
| sizeof(tr_a), &c); |
| /* |
| * If we consumed the entirety of a truncated buffer or |
| * only one char is left (may be a "-"), then stop here, |
| * reset, & come back for more. |
| */ |
| if ((left <= 1) && skipped) { |
| left = saved_left; |
| break; |
| } |
| |
| if (err) |
| break; |
| if (val_a >= bitmap_len || neg) { |
| err = -EINVAL; |
| break; |
| } |
| |
| val_b = val_a; |
| if (left) { |
| p++; |
| left--; |
| } |
| |
| if (c == '-') { |
| err = proc_get_long(&p, &left, &val_b, |
| &neg, tr_b, sizeof(tr_b), |
| &c); |
| /* |
| * If we consumed all of a truncated buffer or |
| * then stop here, reset, & come back for more. |
| */ |
| if (!left && skipped) { |
| left = saved_left; |
| break; |
| } |
| |
| if (err) |
| break; |
| if (val_b >= bitmap_len || neg || |
| val_a > val_b) { |
| err = -EINVAL; |
| break; |
| } |
| if (left) { |
| p++; |
| left--; |
| } |
| } |
| |
| bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); |
| proc_skip_char(&p, &left, '\n'); |
| } |
| left += skipped; |
| } else { |
| unsigned long bit_a, bit_b = 0; |
| bool first = 1; |
| |
| while (left) { |
| bit_a = find_next_bit(bitmap, bitmap_len, bit_b); |
| if (bit_a >= bitmap_len) |
| break; |
| bit_b = find_next_zero_bit(bitmap, bitmap_len, |
| bit_a + 1) - 1; |
| |
| if (!first) |
| proc_put_char(&buffer, &left, ','); |
| proc_put_long(&buffer, &left, bit_a, false); |
| if (bit_a != bit_b) { |
| proc_put_char(&buffer, &left, '-'); |
| proc_put_long(&buffer, &left, bit_b, false); |
| } |
| |
| first = 0; bit_b++; |
| } |
| proc_put_char(&buffer, &left, '\n'); |
| } |
| |
| if (!err) { |
| if (write) { |
| if (*ppos) |
| bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); |
| else |
| bitmap_copy(bitmap, tmp_bitmap, bitmap_len); |
| } |
| *lenp -= left; |
| *ppos += *lenp; |
| } |
| |
| bitmap_free(tmp_bitmap); |
| return err; |
| } |
| |
| #else /* CONFIG_PROC_SYSCTL */ |
| |
| int proc_dostring(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_dobool(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_dointvec(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_douintvec(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_dointvec_minmax(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_douintvec_minmax(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_dou8vec_minmax(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_dointvec_jiffies(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_dointvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_doulongvec_minmax(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_do_large_bitmap(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| #endif /* CONFIG_PROC_SYSCTL */ |
| |
| #if defined(CONFIG_SYSCTL) |
| int proc_do_static_key(struct ctl_table *table, int write, |
| void *buffer, size_t *lenp, loff_t *ppos) |
| { |
| struct static_key *key = (struct static_key *)table->data; |
| static DEFINE_MUTEX(static_key_mutex); |
| int val, ret; |
| struct ctl_table tmp = { |
| .data = &val, |
| .maxlen = sizeof(val), |
| .mode = table->mode, |
| .extra1 = SYSCTL_ZERO, |
| .extra2 = SYSCTL_ONE, |
| }; |
| |
| if (write && !capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| |
| mutex_lock(&static_key_mutex); |
| val = static_key_enabled(key); |
| ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); |
| if (write && !ret) { |
| if (val) |
| static_key_enable(key); |
| else |
| static_key_disable(key); |
| } |
| mutex_unlock(&static_key_mutex); |
| return ret; |
| } |
| |
| static struct ctl_table kern_table[] = { |
| #ifdef CONFIG_NUMA_BALANCING |
| { |
| .procname = "numa_balancing", |
| .data = NULL, /* filled in by handler */ |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = sysctl_numa_balancing, |
| .extra1 = SYSCTL_ZERO, |
| .extra2 = SYSCTL_FOUR, |
| }, |
| { |
| .procname = "numa_balancing_promote_rate_limit_MBps", |
| .data = &sysctl_numa_balancing_promote_rate_limit, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = SYSCTL_ZERO, |
| }, |
| #endif /* CONFIG_NUMA_BALANCING */ |
| { |
| .procname = "panic", |
| .data = &panic_timeout, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #ifdef CONFIG_PROC_SYSCTL |
| { |
| .procname = "tainted", |
| .maxlen = sizeof(long), |
| .mode = 0644, |
| .proc_handler = proc_taint, |
| }, |
| { |
| .procname = "sysctl_writes_strict", |
| .data = &sysctl_writes_strict, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = SYSCTL_NEG_ONE, |
| .extra2 = SYSCTL_ONE, |
| }, |
| #endif |
| { |
| .procname = "print-fatal-signals", |
| .data = &print_fatal_signals, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #ifdef CONFIG_SPARC |
| { |
| .procname = "reboot-cmd", |
| .data = reboot_command, |
| .maxlen = 256, |
| .mode = 0644, |
| .proc_handler = proc_dostring, |
| }, |
| { |
| .procname = "stop-a", |
| .data = &stop_a_enabled, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "scons-poweroff", |
| .data = &scons_pwroff, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_SPARC64 |
| { |
| .procname = "tsb-ratio", |
| .data = &sysctl_tsb_ratio, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_PARISC |
| { |
| .procname = "soft-power", |
| .data = &pwrsw_enabled, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW |
| { |
| .procname = "unaligned-trap", |
| .data = &unaligned_enabled, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_STACK_TRACER |
| { |
| .procname = "stack_tracer_enabled", |
| .data = &stack_tracer_enabled, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = stack_trace_sysctl, |
| }, |
| #endif |
| #ifdef CONFIG_TRACING |
| { |
| .procname = "ftrace_dump_on_oops", |
| .data = &ftrace_dump_on_oops, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "traceoff_on_warning", |
| .data = &__disable_trace_on_warning, |
| .maxlen = sizeof(__disable_trace_on_warning), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "tracepoint_printk", |
| .data = &tracepoint_printk, |
| .maxlen = sizeof(tracepoint_printk), |
| .mode = 0644, |
| .proc_handler = tracepoint_printk_sysctl, |
| }, |
| #endif |
| #ifdef CONFIG_MODULES |
| { |
| .procname = "modprobe", |
| .data = &modprobe_path, |
| .maxlen = KMOD_PATH_LEN, |
| .mode = 0644, |
| .proc_handler = proc_dostring, |
| }, |
| { |
| .procname = "modules_disabled", |
| .data = &modules_disabled, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| /* only handle a transition from default "0" to "1" */ |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = SYSCTL_ONE, |
| .extra2 = SYSCTL_ONE, |
| }, |
| #endif |
| #ifdef CONFIG_UEVENT_HELPER |
| { |
| .procname = "hotplug", |
| .data = &uevent_helper, |
| .maxlen = UEVENT_HELPER_PATH_LEN, |
| .mode = 0644, |
| .proc_handler = proc_dostring, |
| }, |
| #endif |
| #ifdef CONFIG_MAGIC_SYSRQ |
| { |
| .procname = "sysrq", |
| .data = NULL, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = sysrq_sysctl_handler, |
| }, |
| #endif |
| #ifdef CONFIG_PROC_SYSCTL |
| { |
| .procname = "cad_pid", |
| .data = NULL, |
| .maxlen = sizeof (int), |
| .mode = 0600, |
| .proc_handler = proc_do_cad_pid, |
| }, |
| #endif |
| { |
| .procname = "threads-max", |
| .data = NULL, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = sysctl_max_threads, |
| }, |
| { |
| .procname = "usermodehelper", |
| .mode = 0555, |
| .child = usermodehelper_table, |
| }, |
| { |
| .procname = "overflowuid", |
| .data = &overflowuid, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = SYSCTL_ZERO, |
| .extra2 = SYSCTL_MAXOLDUID, |
| }, |
| { |
| .procname = "overflowgid", |
| .data = &overflowgid, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = SYSCTL_ZERO, |
| .extra2 = SYSCTL_MAXOLDUID, |
| }, |
| #ifdef CONFIG_S390 |
| { |
| .procname = "userprocess_debug", |
| .data = &show_unhandled_signals, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| { |
| .procname = "pid_max", |
| .data = &pid_max, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &pid_max_min, |
| .extra2 = &pid_max_max, |
| }, |
| { |
| .procname = "panic_on_oops", |
| .data = &panic_on_oops, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "panic_print", |
| .data = &panic_print, |
| .maxlen = sizeof(unsigned long), |
| .mode = 0644, |
| .proc_handler = proc_doulongvec_minmax, |
| }, |
| { |
| .procname = "ngroups_max", |
| .data = (void *)&ngroups_max, |
| .maxlen = sizeof (int), |
| .mode = 0444, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "cap_last_cap", |
| .data = (void *)&cap_last_cap, |
| .maxlen = sizeof(int), |
| .mode = 0444, |
| .proc_handler = proc_dointvec, |
| }, |
| #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) |
| { |
| .procname = "unknown_nmi_panic", |
| .data = &unknown_nmi_panic, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| |
| #if (defined(CONFIG_X86_32) || defined(CONFIG_PARISC)) && \ |
| defined(CONFIG_DEBUG_STACKOVERFLOW) |
| { |
| .procname = "panic_on_stackoverflow", |
| .data = &sysctl_panic_on_stackoverflow, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #if defined(CONFIG_X86) |
| { |
| .procname = "panic_on_unrecovered_nmi", |
| .data = &panic_on_unrecovered_nmi, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "panic_on_io_nmi", |
| .data = &panic_on_io_nmi, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "bootloader_type", |
| .data = &bootloader_type, |
| .maxlen = sizeof (int), |
| .mode = 0444, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "bootloader_version", |
| .data = &bootloader_version, |
| .maxlen = sizeof (int), |
| .mode = 0444, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "io_delay_type", |
| .data = &io_delay_type, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #if defined(CONFIG_MMU) |
| { |
| .procname = "randomize_va_space", |
| .data = &randomize_va_space, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #if defined(CONFIG_S390) && defined(CONFIG_SMP) |
| { |
| .procname = "spin_retry", |
| .data = &spin_retry, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) |
| { |
| .procname = "acpi_video_flags", |
| .data = &acpi_realmode_flags, |
| .maxlen = sizeof (unsigned long), |
| .mode = 0644, |
| .proc_handler = proc_doulongvec_minmax, |
| }, |
| #endif |
| #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN |
| { |
| .procname = "ignore-unaligned-usertrap", |
| .data = &no_unaligned_warning, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_IA64 |
| { |
| .procname = "unaligned-dump-stack", |
| .data = &unaligned_dump_stack, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_RT_MUTEXES |
| { |
| .procname = "max_lock_depth", |
| .data = &max_lock_depth, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_KEYS |
| { |
| .procname = "keys", |
| .mode = 0555, |
| .child = key_sysctls, |
| }, |
| #endif |
| #ifdef CONFIG_PERF_EVENTS |
| /* |
| * User-space scripts rely on the existence of this file |
| * as a feature check for perf_events being enabled. |
| * |
| * So it's an ABI, do not remove! |
| */ |
| { |
| .procname = "perf_event_paranoid", |
| .data = &sysctl_perf_event_paranoid, |
| .maxlen = sizeof(sysctl_perf_event_paranoid), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "perf_event_mlock_kb", |
| .data = &sysctl_perf_event_mlock, |
| .maxlen = sizeof(sysctl_perf_event_mlock), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "perf_event_max_sample_rate", |
| .data = &sysctl_perf_event_sample_rate, |
| .maxlen = sizeof(sysctl_perf_event_sample_rate), |
| .mode = 0644, |
| .proc_handler = perf_proc_update_handler, |
| .extra1 = SYSCTL_ONE, |
| }, |
| { |
| .procname = "perf_cpu_time_max_percent", |
| .data = &sysctl_perf_cpu_time_max_percent, |
| .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), |
| .mode = 0644, |
| .proc_handler = perf_cpu_time_max_percent_handler, |
| .extra1 = SYSCTL_ZERO, |
| .extra2 = SYSCTL_ONE_HUNDRED, |
| }, |
| { |
| .procname = "perf_event_max_stack", |
| .data = &sysctl_perf_event_max_stack, |
| .maxlen = sizeof(sysctl_perf_event_max_stack), |
| .mode = 0644, |
| .proc_handler = perf_event_max_stack_handler, |
| .extra1 = SYSCTL_ZERO, |
| .extra2 = (void *)&six_hundred_forty_kb, |
| }, |
| { |
| .procname = "perf_event_max_contexts_per_stack", |
| .data = &sysctl_perf_event_max_contexts_per_stack, |
| .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack), |
| .mode = 0644, |
| .proc_handler = perf_event_max_stack_handler, |
| .extra1 = SYSCTL_ZERO, |
| .extra2 = SYSCTL_ONE_THOUSAND, |
| }, |
| #endif |
| { |
| .procname = "panic_on_warn", |
| .data = &panic_on_warn, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = SYSCTL_ZERO, |
| .extra2 = SYSCTL_ONE, |
| }, |
| #ifdef CONFIG_TREE_RCU |
| { |
| .procname = "panic_on_rcu_stall", |
| .data = &sysctl_panic_on_rcu_stall, |
| .maxlen = sizeof(sysctl_panic_on_rcu_stall), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = SYSCTL_ZERO, |
| .extra2 = SYSCTL_ONE, |
| }, |
| { |
| .procname = "max_rcu_stall_to_panic", |
| .data = &sysctl_max_rcu_stall_to_panic, |
| .maxlen = sizeof(sysctl_max_rcu_stall_to_panic), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = SYSCTL_ONE, |
| .extra2 = SYSCTL_INT_MAX, |
| }, |
| #endif |
| { } |
| }; |
| |
| static struct ctl_table vm_table[] = { |
| { |
| .procname = "overcommit_memory", |
| .data = &sysctl_overcommit_memory, |
| .maxlen = sizeof(sysctl_overcommit_memory), |
| .mode = 0644, |
| .proc_handler = overcommit_policy_handler, |
| .extra1 = SYSCTL_ZERO, |
| .extra2 = SYSCTL_TWO, |
| }, |
| { |
| .procname = "overcommit_ratio", |
| .data = &sysctl_overcommit_ratio, |
| .maxlen = sizeof(sysctl_overcommit_ratio), |
| .mode = 0644, |
| .proc_handler = overcommit_ratio_handler, |
| }, |
| { |
| .procname = "overcommit_kbytes", |
| .data = &sysctl_overcommit_kbytes, |
| .maxlen = sizeof(sysctl_overcommit_kbytes), |
| .mode = 0644, |
| .proc_handler = overcommit_kbytes_handler, |
| }, |
| { |
| .procname = "page-cluster", |
| .data = &page_cluster, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = SYSCTL_ZERO, |
| }, |
| { |
| .procname = "dirtytime_expire_seconds", |
| .data = &dirtytime_expire_interval, |
| .maxlen = sizeof(dirtytime_expire_interval), |
| .mode = 0644, |
| .proc_handler = dirtytime_interval_handler, |
| .extra1 = SYSCTL_ZERO, |
| }, |
| { |
| .procname = "swappiness", |
| .data = &vm_swappiness, |
| .maxlen = sizeof(vm_swappiness), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = SYSCTL_ZERO, |
| .extra2 = SYSCTL_TWO_HUNDRED, |
| }, |
| #ifdef CONFIG_NUMA |
| { |
| .procname = "numa_stat", |
| .data = &sysctl_vm_numa_stat, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = sysctl_vm_numa_stat_handler, |
| .extra1 = SYSCTL_ZERO, |
| .extra2 = SYSCTL_ONE, |
| }, |
| #endif |
| #ifdef CONFIG_HUGETLB_PAGE |
| { |
| .procname = "nr_hugepages", |
| .data = NULL, |
| .maxlen = sizeof(unsigned long), |
| .mode = 0644, |
| .proc_handler = hugetlb_sysctl_handler, |
| }, |
| #ifdef CONFIG_NUMA |
| { |
| .procname = "nr_hugepages_mempolicy", |
| .data = NULL, |
| .maxlen = sizeof(unsigned long), |
| .mode = 0644, |
| .proc_handler = &hugetlb_mempolicy_sysctl_handler, |
| }, |
| #endif |
| { |
| .procname = "hugetlb_shm_group", |
| .data = &sysctl_hugetlb_shm_group, |
| .maxlen = sizeof(gid_t), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "nr_overcommit_hugepages", |
| .data = NULL, |
| .maxlen = sizeof(unsigned long), |
| .mode = 0644, |
| .proc_handler = hugetlb_overcommit_handler, |
| }, |
| #endif |
| { |
| .procname = "lowmem_reserve_ratio", |
| .data = &sysctl_lowmem_reserve_ratio, |
| .maxlen = sizeof(sysctl_lowmem_reserve_ratio), |
| .mode = 0644, |
| .proc_handler = lowmem_reserve_ratio_sysctl_handler, |
| }, |
| { |
| .procname = "drop_caches", |
| .data = &sysctl_drop_caches, |
| .maxlen = sizeof(int), |
| .mode = 0200, |
| .proc_handler = drop_caches_sysctl_handler, |
| .extra1 = SYSCTL_ONE, |
| .extra2 = SYSCTL_FOUR, |
| }, |
| #ifdef CONFIG_COMPACTION |
| { |
| .procname = "compact_memory", |
| .data = NULL, |
| .maxlen = sizeof(int), |
| .mode = 0200, |
| .proc_handler = sysctl_compaction_handler, |
| }, |
| { |
| .procname = "compaction_proactiveness", |
| .data = &sysctl_compaction_proactiveness, |
| .maxlen = sizeof(sysctl_compaction_proactiveness), |
| .mode = 0644, |
| .proc_handler = compaction_proactiveness_sysctl_handler, |
| .extra1 = SYSCTL_ZERO, |
| .extra2 = SYSCTL_ONE_HUNDRED, |
| }, |
| { |
| .procname = "extfrag_threshold", |
| .data = &sysctl_extfrag_threshold, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = SYSCTL_ZERO, |
| .extra2 = SYSCTL_ONE_THOUSAND, |
| }, |
| { |
| .procname = "compact_unevictable_allowed", |
| .data = &sysctl_compact_unevictable_allowed, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax_warn_RT_change, |
| .extra1 = SYSCTL_ZERO, |
| .extra2 = SYSCTL_ONE, |
| }, |
| |
| #endif /* CONFIG_COMPACTION */ |
| { |
| .procname = "min_free_kbytes", |
| .data = &min_free_kbytes, |
| .maxlen = sizeof(min_free_kbytes), |
| .mode = 0644, |
| .proc_handler = min_free_kbytes_sysctl_handler, |
| .extra1 = SYSCTL_ZERO, |
| }, |
| { |
| .procname = "watermark_boost_factor", |
| .data = &watermark_boost_factor, |
| .maxlen = sizeof(watermark_boost_factor), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = SYSCTL_ZERO, |
| }, |
| { |
| .procname = "watermark_scale_factor", |
| .data = &watermark_scale_factor, |
| .maxlen = sizeof(watermark_scale_factor), |
| .mode = 0644, |
| .proc_handler = watermark_scale_factor_sysctl_handler, |
| .extra1 = SYSCTL_ONE, |
| .extra2 = SYSCTL_THREE_THOUSAND, |
| }, |
| { |
| .procname = "percpu_pagelist_high_fraction", |
| .data = &percpu_pagelist_high_fraction, |
| .maxlen = sizeof(percpu_pagelist_high_fraction), |
| .mode = 0644, |
| .proc_handler = percpu_pagelist_high_fraction_sysctl_handler, |
| .extra1 = SYSCTL_ZERO, |
| }, |
| { |
| .procname = "page_lock_unfairness", |
| .data = &sysctl_page_lock_unfairness, |
| .maxlen = sizeof(sysctl_page_lock_unfairness), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = SYSCTL_ZERO, |
| }, |
| #ifdef CONFIG_MMU |
| { |
| .procname = "max_map_count", |
| .data = &sysctl_max_map_count, |
| .maxlen = sizeof(sysctl_max_map_count), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = SYSCTL_ZERO, |
| }, |
| #else |
| { |
| .procname = "nr_trim_pages", |
| .data = &sysctl_nr_trim_pages, |
| .maxlen = sizeof(sysctl_nr_trim_pages), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = SYSCTL_ZERO, |
| }, |
| #endif |
| { |
| .procname = "vfs_cache_pressure", |
| .data = &sysctl_vfs_cache_pressure, |
| .maxlen = sizeof(sysctl_vfs_cache_pressure), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = SYSCTL_ZERO, |
| }, |
| #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \ |
| defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT) |
| { |
| .procname = "legacy_va_layout", |
| .data = &sysctl_legacy_va_layout, |
| .maxlen = sizeof(sysctl_legacy_va_layout), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = SYSCTL_ZERO, |
| }, |
| #endif |
| #ifdef CONFIG_NUMA |
| { |
| .procname = "zone_reclaim_mode", |
| .data = &node_reclaim_mode, |
| .maxlen = sizeof(node_reclaim_mode), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = SYSCTL_ZERO, |
| }, |
| { |
| .procname = "min_unmapped_ratio", |
| .data = &sysctl_min_unmapped_ratio, |
| .maxlen = sizeof(sysctl_min_unmapped_ratio), |
| .mode = 0644, |
| .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, |
| .extra1 = SYSCTL_ZERO, |
| .extra2 = SYSCTL_ONE_HUNDRED, |
| }, |
| { |
| .procname = "min_slab_ratio", |
| .data = &sysctl_min_slab_ratio, |
| .maxlen = sizeof(sysctl_min_slab_ratio), |
| .mode = 0644, |
| .proc_handler = sysctl_min_slab_ratio_sysctl_handler, |
| .extra1 = SYSCTL_ZERO, |
| .extra2 = SYSCTL_ONE_HUNDRED, |
| }, |
| #endif |
| #ifdef CONFIG_SMP |
| { |
| .procname = "stat_interval", |
| .data = &sysctl_stat_interval, |
| .maxlen = sizeof(sysctl_stat_interval), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_jiffies, |
| }, |
| { |
| .procname = "stat_refresh", |
| .data = NULL, |
| .maxlen = 0, |
| .mode = 0600, |
| .proc_handler = vmstat_refresh, |
| }, |
| #endif |
| #ifdef CONFIG_MMU |
| { |
| .procname = "mmap_min_addr", |
| .data = &dac_mmap_min_addr, |
| .maxlen = sizeof(unsigned long), |
| .mode = 0644, |
| .proc_handler = mmap_min_addr_handler, |
| }, |
| #endif |
| #ifdef CONFIG_NUMA |
| { |
| .procname = "numa_zonelist_order", |
| .data = &numa_zonelist_order, |
| .maxlen = NUMA_ZONELIST_ORDER_LEN, |
| .mode = 0644, |
| .proc_handler = numa_zonelist_order_handler, |
| }, |
| #endif |
| #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ |
| (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) |
| { |
| .procname = "vdso_enabled", |
| #ifdef CONFIG_X86_32 |
| .data = &vdso32_enabled, |
| .maxlen = sizeof(vdso32_enabled), |
| #else |
| .data = &vdso_enabled, |
| .maxlen = sizeof(vdso_enabled), |
| #endif |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| .extra1 = SYSCTL_ZERO, |
| }, |
| #endif |
| #ifdef CONFIG_MEMORY_FAILURE |
| { |
| .procname = "memory_failure_early_kill", |
| .data = &sysctl_memory_failure_early_kill, |
| .maxlen = sizeof(sysctl_memory_failure_early_kill), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = SYSCTL_ZERO, |
| .extra2 = SYSCTL_ONE, |
| }, |
| { |
| .procname = "memory_failure_recovery", |
| .data = &sysctl_memory_failure_recovery, |
| .maxlen = sizeof(sysctl_memory_failure_recovery), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = SYSCTL_ZERO, |
| .extra2 = SYSCTL_ONE, |
| }, |
| #endif |
| { |
| .procname = "user_reserve_kbytes", |
| .data = &sysctl_user_reserve_kbytes, |
| .maxlen = sizeof(sysctl_user_reserve_kbytes), |
| .mode = 0644, |
| .proc_handler = proc_doulongvec_minmax, |
| }, |
| { |
| .procname = "admin_reserve_kbytes", |
| .data = &sysctl_admin_reserve_kbytes, |
| .maxlen = sizeof(sysctl_admin_reserve_kbytes), |
| .mode = 0644, |
| .proc_handler = proc_doulongvec_minmax, |
| }, |
| #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS |
| { |
| .procname = "mmap_rnd_bits", |
| .data = &mmap_rnd_bits, |
| .maxlen = sizeof(mmap_rnd_bits), |
| .mode = 0600, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = (void *)&mmap_rnd_bits_min, |
| .extra2 = (void *)&mmap_rnd_bits_max, |
| }, |
| #endif |
| #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS |
| { |
| .procname = "mmap_rnd_compat_bits", |
| .data = &mmap_rnd_compat_bits, |
| .maxlen = sizeof(mmap_rnd_compat_bits), |
| .mode = 0600, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = (void *)&mmap_rnd_compat_bits_min, |
| .extra2 = (void *)&mmap_rnd_compat_bits_max, |
| }, |
| #endif |
| #ifdef CONFIG_USERFAULTFD |
| { |
| .procname = "unprivileged_userfaultfd", |
| .data = &sysctl_unprivileged_userfaultfd, |
| .maxlen = sizeof(sysctl_unprivileged_userfaultfd), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = SYSCTL_ZERO, |
| .extra2 = SYSCTL_ONE, |
| }, |
| #endif |
| { } |
| }; |
| |
| static struct ctl_table debug_table[] = { |
| #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE |
| { |
| .procname = "exception-trace", |
| .data = &show_unhandled_signals, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec |
| }, |
| #endif |
| { } |
| }; |
| |
| static struct ctl_table dev_table[] = { |
| { } |
| }; |
| |
| DECLARE_SYSCTL_BASE(kernel, kern_table); |
| DECLARE_SYSCTL_BASE(vm, vm_table); |
| DECLARE_SYSCTL_BASE(debug, debug_table); |
| DECLARE_SYSCTL_BASE(dev, dev_table); |
| |
| int __init sysctl_init_bases(void) |
| { |
| register_sysctl_base(kernel); |
| register_sysctl_base(vm); |
| register_sysctl_base(debug); |
| register_sysctl_base(dev); |
| |
| return 0; |
| } |
| #endif /* CONFIG_SYSCTL */ |
| /* |
| * No sense putting this after each symbol definition, twice, |
| * exception granted :-) |
| */ |
| EXPORT_SYMBOL(proc_dobool); |
| EXPORT_SYMBOL(proc_dointvec); |
| EXPORT_SYMBOL(proc_douintvec); |
| EXPORT_SYMBOL(proc_dointvec_jiffies); |
| EXPORT_SYMBOL(proc_dointvec_minmax); |
| EXPORT_SYMBOL_GPL(proc_douintvec_minmax); |
| EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); |
| EXPORT_SYMBOL(proc_dointvec_ms_jiffies); |
| EXPORT_SYMBOL(proc_dostring); |
| EXPORT_SYMBOL(proc_doulongvec_minmax); |
| EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); |
| EXPORT_SYMBOL(proc_do_large_bitmap); |