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authorChristoph Hellwig <hch@lst.de>2020-04-24 08:43:37 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2020-04-27 02:07:26 -0400
commitf461d2dcd511c020a26d4d791fae595c65ed09b6 (patch)
tree68ff565504025976bb25a8638769ef5fe2d79e1b
parent2374c09b1c8a883bb9b4b2fc3756703eeb618f4a (diff)
sysctl: avoid forward declarations
Move the sysctl tables to the end of the file to avoid lots of pointless forward declarations. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--kernel/sysctl.c3031
1 files changed, 1497 insertions, 1534 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 31b934865ebc..3fafca3ced98 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -176,94 +176,1495 @@ enum sysctl_writes_mode {
};
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
+
+#ifdef CONFIG_SCHED_DEBUG
+static int min_sched_granularity_ns = 100000; /* 100 usecs */
+static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
+static int min_wakeup_granularity_ns; /* 0 usecs */
+static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
+#ifdef CONFIG_SMP
+static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
+static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
+#endif /* CONFIG_SMP */
+#endif /* CONFIG_SCHED_DEBUG */
+
+#ifdef CONFIG_COMPACTION
+static int min_extfrag_threshold;
+static int max_extfrag_threshold = 1000;
+#endif
+
+#endif /* CONFIG_SYSCTL */
+
+/*
+ * /proc/sys support
+ */
+
+#ifdef CONFIG_PROC_SYSCTL
+
+static int _proc_do_string(char *data, int maxlen, int write,
+ char __user *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+ size_t len;
+ char __user *p;
+ char c;
+
+ 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) {
+ if (get_user(c, p++))
+ return -EFAULT;
+ 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)
+ if (copy_to_user(buffer, data, len))
+ return -EFAULT;
+ if (len < *lenp) {
+ if (put_user('\n', buffer + len))
+ return -EFAULT;
+ 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 __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ if (write)
+ proc_first_pos_non_zero_ignore(ppos, table);
+
+ return _proc_do_string((char *)(table->data), table->maxlen, write,
+ (char __user *)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 %0 is returned and @buf and @size are updated with
+ * the amount of bytes written.
+ */
+static int proc_put_long(void __user **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;
+ if (copy_to_user(*buf, tmp, len))
+ return -EFAULT;
+ *size -= len;
+ *buf += len;
+ return 0;
+}
+#undef TMPBUFLEN
+
+static int proc_put_char(void __user **buf, size_t *size, char c)
+{
+ if (*size) {
+ char __user **buffer = (char __user **)buf;
+ if (put_user(c, *buffer))
+ return -EFAULT;
+ (*size)--, (*buffer)++;
+ *buf = *buffer;
+ }
+ 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;
+ *valp = -*lvalp;
+ } else {
+ if (*lvalp > (unsigned long) INT_MAX)
+ return -EINVAL;
+ *valp = *lvalp;
+ }
+ } else {
+ int val = *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;
+ *valp = *lvalp;
+ } else {
+ unsigned int val = *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 __user *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 *kbuf = NULL, *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 = kbuf = memdup_user_nul(buffer, left);
+ if (IS_ERR(kbuf))
+ return PTR_ERR(kbuf);
+ }
+
+ 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)
+ err = proc_put_char(&buffer, &left, '\t');
+ if (err)
+ break;
+ err = proc_put_long(&buffer, &left, lval, neg);
+ if (err)
+ break;
+ }
+ }
+
+ if (!write && !first && left && !err)
+ err = proc_put_char(&buffer, &left, '\n');
+ if (write && !err && left)
+ left -= proc_skip_spaces(&p);
+ if (write) {
+ kfree(kbuf);
+ if (first)
+ return err ? : -EINVAL;
+ }
+ *lenp -= left;
+out:
+ *ppos += *lenp;
+ return err;
+}
+
+static int do_proc_dointvec(struct ctl_table *table, int write,
+ void __user *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 __user *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 *kbuf = NULL, *p;
+
+ left = *lenp;
+
+ if (proc_first_pos_non_zero_ignore(ppos, table))
+ goto bail_early;
+
+ if (left > PAGE_SIZE - 1)
+ left = PAGE_SIZE - 1;
+
+ p = kbuf = memdup_user_nul(buffer, left);
+ if (IS_ERR(kbuf))
+ return -EINVAL;
+
+ 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:
+ kfree(kbuf);
+ 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 __user *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;
+ }
+
+ err = proc_put_long(&buffer, &left, lval, false);
+ if (err || !left)
+ goto out;
+
+ err = 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 __user *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);
+}
+
+static int do_proc_douintvec(struct ctl_table *table, int write,
+ void __user *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_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 __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
+}
-static int proc_do_cad_pid(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos);
-static int proc_taint(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos);
#ifdef CONFIG_COMPACTION
static int proc_dointvec_minmax_warn_RT_change(struct ctl_table *table,
int write, void __user *buffer,
- size_t *lenp, loff_t *ppos);
-#endif
+ 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 __user *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 __user *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) {
+ /*
+ * Poor man's atomic or. Not worth adding a primitive
+ * to everyone's atomic.h for this
+ */
+ int i;
+ for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
+ if ((tmptaint >> i) & 1)
+ add_taint(i, LOCKDEP_STILL_OK);
+ }
+ }
+
+ return err;
+}
+
#ifdef CONFIG_PRINTK
static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos);
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ if (write && !capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
+}
#endif
+/**
+ * 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;
+ *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 __user *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, &param);
+}
+
+/**
+ * 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;
+
+ *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 __user *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, &param);
+}
+
+static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
+ unsigned int *valp,
+ int write, void *data)
+{
+ if (write) {
+ unsigned int val;
+
+ val = round_pipe_size(*lvalp);
+ if (val == 0)
+ return -EINVAL;
+
+ *valp = val;
+ } else {
+ unsigned int val = *valp;
+ *lvalp = (unsigned long) val;
+ }
+
+ return 0;
+}
+
+static int proc_dopipe_max_size(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ return do_proc_douintvec(table, write, buffer, lenp, ppos,
+ do_proc_dopipe_max_size_conv, NULL);
+}
+
+static void validate_coredump_safety(void)
+{
+#ifdef CONFIG_COREDUMP
+ if (suid_dumpable == SUID_DUMP_ROOT &&
+ core_pattern[0] != '/' && core_pattern[0] != '|') {
+ printk(KERN_WARNING
+"Unsafe core_pattern used with fs.suid_dumpable=2.\n"
+"Pipe handler or fully qualified core dump path required.\n"
+"Set kernel.core_pattern before fs.suid_dumpable.\n"
+ );
+ }
+#endif
+}
+
static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos);
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
+ if (!error)
+ validate_coredump_safety();
+ return error;
+}
+
#ifdef CONFIG_COREDUMP
static int proc_dostring_coredump(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos);
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ int error = proc_dostring(table, write, buffer, lenp, ppos);
+ if (!error)
+ validate_coredump_safety();
+ return error;
+}
#endif
-static int proc_dopipe_max_size(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos);
#ifdef CONFIG_MAGIC_SYSRQ
static int sysrq_sysctl_handler(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos);
-#endif
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ int tmp, ret;
-static struct ctl_table kern_table[];
-static struct ctl_table vm_table[];
-static struct ctl_table fs_table[];
-static struct ctl_table debug_table[];
-static struct ctl_table dev_table[];
+ tmp = sysrq_mask();
-#if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
- defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
-int sysctl_legacy_va_layout;
+ 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
-/* The default sysctl tables: */
+static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
+ void __user *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 *kbuf = NULL, *p;
-static struct ctl_table sysctl_base_table[] = {
- {
- .procname = "kernel",
- .mode = 0555,
- .child = kern_table,
- },
- {
- .procname = "vm",
- .mode = 0555,
- .child = vm_table,
- },
- {
- .procname = "fs",
- .mode = 0555,
- .child = fs_table,
- },
- {
- .procname = "debug",
- .mode = 0555,
- .child = debug_table,
- },
- {
- .procname = "dev",
- .mode = 0555,
- .child = dev_table,
- },
- { }
-};
+ if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
+ *lenp = 0;
+ return 0;
+ }
-#ifdef CONFIG_SCHED_DEBUG
-static int min_sched_granularity_ns = 100000; /* 100 usecs */
-static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
-static int min_wakeup_granularity_ns; /* 0 usecs */
-static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
-#ifdef CONFIG_SMP
-static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
-static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
-#endif /* CONFIG_SMP */
-#endif /* CONFIG_SCHED_DEBUG */
+ i = (unsigned long *) data;
+ min = (unsigned long *) table->extra1;
+ max = (unsigned long *) 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 = kbuf = memdup_user_nul(buffer, left);
+ if (IS_ERR(kbuf))
+ return PTR_ERR(kbuf);
+ }
+
+ 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)
+ break;
+ if (neg)
+ continue;
+ val = convmul * val / convdiv;
+ if ((min && val < *min) || (max && val > *max)) {
+ err = -EINVAL;
+ break;
+ }
+ *i = val;
+ } else {
+ val = convdiv * (*i) / convmul;
+ if (!first) {
+ err = proc_put_char(&buffer, &left, '\t');
+ if (err)
+ break;
+ }
+ err = proc_put_long(&buffer, &left, val, false);
+ if (err)
+ break;
+ }
+ }
+
+ if (!write && !first && left && !err)
+ err = proc_put_char(&buffer, &left, '\n');
+ if (write && !err)
+ left -= proc_skip_spaces(&p);
+ if (write) {
+ kfree(kbuf);
+ if (first)
+ return err ? : -EINVAL;
+ }
+ *lenp -= left;
+out:
+ *ppos += *lenp;
+ return err;
+}
+
+static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
+ void __user *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 __user *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 __user *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+ return do_proc_doulongvec_minmax(table, write, buffer,
+ lenp, ppos, HZ, 1000l);
+}
-#ifdef CONFIG_COMPACTION
-static int min_extfrag_threshold;
-static int max_extfrag_threshold = 1000;
-#endif
+
+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;
+ *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
+ } else {
+ int val = *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;
+ *valp = (int)jif;
+ } 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_msecs(lval);
+ }
+ 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 __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ return do_proc_dointvec(table,write,buffer,lenp,ppos,
+ do_proc_dointvec_jiffies_conv,NULL);
+}
+
+/**
+ * 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 __user *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 __user *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 __user *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 __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ int err = 0;
+ bool first = 1;
+ 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 *kbuf, *p;
+ 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;
+ }
+
+ p = kbuf = memdup_user_nul(buffer, left);
+ if (IS_ERR(kbuf))
+ return PTR_ERR(kbuf);
+
+ tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL);
+ if (!tmp_bitmap) {
+ kfree(kbuf);
+ 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);
+ first = 0;
+ proc_skip_char(&p, &left, '\n');
+ }
+ kfree(kbuf);
+ left += skipped;
+ } else {
+ unsigned long bit_a, bit_b = 0;
+
+ 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) {
+ err = proc_put_char(&buffer, &left, ',');
+ if (err)
+ break;
+ }
+ err = proc_put_long(&buffer, &left, bit_a, false);
+ if (err)
+ break;
+ if (bit_a != bit_b) {
+ err = proc_put_char(&buffer, &left, '-');
+ if (err)
+ break;
+ err = proc_put_long(&buffer, &left, bit_b, false);
+ if (err)
+ break;
+ }
+
+ first = 0; bit_b++;
+ }
+ if (!err)
+ err = 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 __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
+int proc_dointvec(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
+int proc_douintvec(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
+int proc_dointvec_minmax(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
+int proc_douintvec_minmax(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
+int proc_dointvec_jiffies(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
+int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
+int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
+int proc_doulongvec_minmax(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
+int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
+ void __user *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
+int proc_do_large_bitmap(struct ctl_table *table, int write,
+ void __user *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 __user *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[] = {
{
@@ -574,7 +1975,7 @@ static struct ctl_table kern_table[] = {
.procname = "soft-power",
.data = &pwrsw_enabled,
.maxlen = sizeof (int),
- .mode = 0644,
+ .mode = 0644,
.proc_handler = proc_dointvec,
},
#endif
@@ -1033,7 +2434,7 @@ static struct ctl_table kern_table[] = {
.procname = "ignore-unaligned-usertrap",
.data = &no_unaligned_warning,
.maxlen = sizeof (int),
- .mode = 0644,
+ .mode = 0644,
.proc_handler = proc_dointvec,
},
#endif
@@ -1281,7 +2682,7 @@ static struct ctl_table vm_table[] = {
.proc_handler = overcommit_kbytes_handler,
},
{
- .procname = "page-cluster",
+ .procname = "page-cluster",
.data = &page_cluster,
.maxlen = sizeof(int),
.mode = 0644,
@@ -1920,6 +3321,35 @@ static struct ctl_table dev_table[] = {
{ }
};
+static struct ctl_table sysctl_base_table[] = {
+ {
+ .procname = "kernel",
+ .mode = 0555,
+ .child = kern_table,
+ },
+ {
+ .procname = "vm",
+ .mode = 0555,
+ .child = vm_table,
+ },
+ {
+ .procname = "fs",
+ .mode = 0555,
+ .child = fs_table,
+ },
+ {
+ .procname = "debug",
+ .mode = 0555,
+ .child = debug_table,
+ },
+ {
+ .procname = "dev",
+ .mode = 0555,
+ .child = dev_table,
+ },
+ { }
+};
+
int __init sysctl_init(void)
{
struct ctl_table_header *hdr;
@@ -1928,1474 +3358,7 @@ int __init sysctl_init(void)
kmemleak_not_leak(hdr);
return 0;
}
-
#endif /* CONFIG_SYSCTL */
-
-/*
- * /proc/sys support
- */
-
-#ifdef CONFIG_PROC_SYSCTL
-
-static int _proc_do_string(char *data, int maxlen, int write,
- char __user *buffer,
- size_t *lenp, loff_t *ppos)
-{
- size_t len;
- char __user *p;
- char c;
-
- 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) {
- if (get_user(c, p++))
- return -EFAULT;
- 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)
- if (copy_to_user(buffer, data, len))
- return -EFAULT;
- if (len < *lenp) {
- if (put_user('\n', buffer + len))
- return -EFAULT;
- 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 __user *buffer, size_t *lenp, loff_t *ppos)
-{
- if (write)
- proc_first_pos_non_zero_ignore(ppos, table);
-
- return _proc_do_string((char *)(table->data), table->maxlen, write,
- (char __user *)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 %0 is returned and @buf and @size are updated with
- * the amount of bytes written.
- */
-static int proc_put_long(void __user **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;
- if (copy_to_user(*buf, tmp, len))
- return -EFAULT;
- *size -= len;
- *buf += len;
- return 0;
-}
-#undef TMPBUFLEN
-
-static int proc_put_char(void __user **buf, size_t *size, char c)
-{
- if (*size) {
- char __user **buffer = (char __user **)buf;
- if (put_user(c, *buffer))
- return -EFAULT;
- (*size)--, (*buffer)++;
- *buf = *buffer;
- }
- 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;
- *valp = -*lvalp;
- } else {
- if (*lvalp > (unsigned long) INT_MAX)
- return -EINVAL;
- *valp = *lvalp;
- }
- } else {
- int val = *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;
- *valp = *lvalp;
- } else {
- unsigned int val = *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 __user *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 *kbuf = NULL, *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 = kbuf = memdup_user_nul(buffer, left);
- if (IS_ERR(kbuf))
- return PTR_ERR(kbuf);
- }
-
- 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)
- err = proc_put_char(&buffer, &left, '\t');
- if (err)
- break;
- err = proc_put_long(&buffer, &left, lval, neg);
- if (err)
- break;
- }
- }
-
- if (!write && !first && left && !err)
- err = proc_put_char(&buffer, &left, '\n');
- if (write && !err && left)
- left -= proc_skip_spaces(&p);
- if (write) {
- kfree(kbuf);
- if (first)
- return err ? : -EINVAL;
- }
- *lenp -= left;
-out:
- *ppos += *lenp;
- return err;
-}
-
-static int do_proc_dointvec(struct ctl_table *table, int write,
- void __user *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 __user *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 *kbuf = NULL, *p;
-
- left = *lenp;
-
- if (proc_first_pos_non_zero_ignore(ppos, table))
- goto bail_early;
-
- if (left > PAGE_SIZE - 1)
- left = PAGE_SIZE - 1;
-
- p = kbuf = memdup_user_nul(buffer, left);
- if (IS_ERR(kbuf))
- return -EINVAL;
-
- 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:
- kfree(kbuf);
- 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 __user *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;
- }
-
- err = proc_put_long(&buffer, &left, lval, false);
- if (err || !left)
- goto out;
-
- err = 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 __user *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);
-}
-
-static int do_proc_douintvec(struct ctl_table *table, int write,
- void __user *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_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 __user *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 __user *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 __user *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 __user *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) {
- /*
- * Poor man's atomic or. Not worth adding a primitive
- * to everyone's atomic.h for this
- */
- int i;
- for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
- if ((tmptaint >> i) & 1)
- add_taint(i, LOCKDEP_STILL_OK);
- }
- }
-
- return err;
-}
-
-#ifdef CONFIG_PRINTK
-static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
-{
- if (write && !capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
-}
-#endif
-
-/**
- * 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;
- *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 __user *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, &param);
-}
-
-/**
- * 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;
-
- *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 __user *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, &param);
-}
-
-static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
- unsigned int *valp,
- int write, void *data)
-{
- if (write) {
- unsigned int val;
-
- val = round_pipe_size(*lvalp);
- if (val == 0)
- return -EINVAL;
-
- *valp = val;
- } else {
- unsigned int val = *valp;
- *lvalp = (unsigned long) val;
- }
-
- return 0;
-}
-
-static int proc_dopipe_max_size(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
-{
- return do_proc_douintvec(table, write, buffer, lenp, ppos,
- do_proc_dopipe_max_size_conv, NULL);
-}
-
-static void validate_coredump_safety(void)
-{
-#ifdef CONFIG_COREDUMP
- if (suid_dumpable == SUID_DUMP_ROOT &&
- core_pattern[0] != '/' && core_pattern[0] != '|') {
- printk(KERN_WARNING
-"Unsafe core_pattern used with fs.suid_dumpable=2.\n"
-"Pipe handler or fully qualified core dump path required.\n"
-"Set kernel.core_pattern before fs.suid_dumpable.\n"
- );
- }
-#endif
-}
-
-static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
-{
- int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
- if (!error)
- validate_coredump_safety();
- return error;
-}
-
-#ifdef CONFIG_COREDUMP
-static int proc_dostring_coredump(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
-{
- int error = proc_dostring(table, write, buffer, lenp, ppos);
- if (!error)
- validate_coredump_safety();
- return error;
-}
-#endif
-
-#ifdef CONFIG_MAGIC_SYSRQ
-static int sysrq_sysctl_handler(struct ctl_table *table, int write,
- void __user *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 __user *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 *kbuf = NULL, *p;
-
- if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
- *lenp = 0;
- return 0;
- }
-
- i = (unsigned long *) data;
- min = (unsigned long *) table->extra1;
- max = (unsigned long *) 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 = kbuf = memdup_user_nul(buffer, left);
- if (IS_ERR(kbuf))
- return PTR_ERR(kbuf);
- }
-
- 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)
- break;
- if (neg)
- continue;
- val = convmul * val / convdiv;
- if ((min && val < *min) || (max && val > *max)) {
- err = -EINVAL;
- break;
- }
- *i = val;
- } else {
- val = convdiv * (*i) / convmul;
- if (!first) {
- err = proc_put_char(&buffer, &left, '\t');
- if (err)
- break;
- }
- err = proc_put_long(&buffer, &left, val, false);
- if (err)
- break;
- }
- }
-
- if (!write && !first && left && !err)
- err = proc_put_char(&buffer, &left, '\n');
- if (write && !err)
- left -= proc_skip_spaces(&p);
- if (write) {
- kfree(kbuf);
- if (first)
- return err ? : -EINVAL;
- }
- *lenp -= left;
-out:
- *ppos += *lenp;
- return err;
-}
-
-static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
- void __user *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 __user *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 __user *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;
- *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
- } else {
- int val = *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;
- *valp = (int)jif;
- } 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_msecs(lval);
- }
- 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 __user *buffer, size_t *lenp, loff_t *ppos)
-{
- return do_proc_dointvec(table,write,buffer,lenp,ppos,
- do_proc_dointvec_jiffies_conv,NULL);
-}
-
-/**
- * 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 __user *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 __user *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 __user *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 __user *buffer, size_t *lenp, loff_t *ppos)
-{
- int err = 0;
- bool first = 1;
- 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 *kbuf, *p;
- 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;
- }
-
- p = kbuf = memdup_user_nul(buffer, left);
- if (IS_ERR(kbuf))
- return PTR_ERR(kbuf);
-
- tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL);
- if (!tmp_bitmap) {
- kfree(kbuf);
- 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);
- first = 0;
- proc_skip_char(&p, &left, '\n');
- }
- kfree(kbuf);
- left += skipped;
- } else {
- unsigned long bit_a, bit_b = 0;
-
- 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) {
- err = proc_put_char(&buffer, &left, ',');
- if (err)
- break;
- }
- err = proc_put_long(&buffer, &left, bit_a, false);
- if (err)
- break;
- if (bit_a != bit_b) {
- err = proc_put_char(&buffer, &left, '-');
- if (err)
- break;
- err = proc_put_long(&buffer, &left, bit_b, false);
- if (err)
- break;
- }
-
- first = 0; bit_b++;
- }
- if (!err)
- err = 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 __user *buffer, size_t *lenp, loff_t *ppos)
-{
- return -ENOSYS;
-}
-
-int proc_dointvec(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
-{
- return -ENOSYS;
-}
-
-int proc_douintvec(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
-{
- return -ENOSYS;
-}
-
-int proc_dointvec_minmax(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
-{
- return -ENOSYS;
-}
-
-int proc_douintvec_minmax(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
-{
- return -ENOSYS;
-}
-
-int proc_dointvec_jiffies(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
-{
- return -ENOSYS;
-}
-
-int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
-{
- return -ENOSYS;
-}
-
-int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
-{
- return -ENOSYS;
-}
-
-int proc_doulongvec_minmax(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
-{
- return -ENOSYS;
-}
-
-int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
- void __user *buffer,
- size_t *lenp, loff_t *ppos)
-{
- return -ENOSYS;
-}
-
-int proc_do_large_bitmap(struct ctl_table *table, int write,
- void __user *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 __user *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;
-}
-#endif
/*
* No sense putting this after each symbol definition, twice,
* exception granted :-)

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