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Diffstat (limited to 'kernel/sysctl.c')
-rw-r--r--kernel/sysctl.c118
1 files changed, 81 insertions, 37 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index e52b6e372c60..205d605cacc5 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -446,14 +446,14 @@ static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
if (*negp) {
if (*lvalp > (unsigned long) INT_MAX + 1)
return -EINVAL;
- *valp = -*lvalp;
+ WRITE_ONCE(*valp, -*lvalp);
} else {
if (*lvalp > (unsigned long) INT_MAX)
return -EINVAL;
- *valp = *lvalp;
+ WRITE_ONCE(*valp, *lvalp);
}
} else {
- int val = *valp;
+ int val = READ_ONCE(*valp);
if (val < 0) {
*negp = true;
*lvalp = -(unsigned long)val;
@@ -472,9 +472,9 @@ static int do_proc_douintvec_conv(unsigned long *lvalp,
if (write) {
if (*lvalp > UINT_MAX)
return -EINVAL;
- *valp = *lvalp;
+ WRITE_ONCE(*valp, *lvalp);
} else {
- unsigned int val = *valp;
+ unsigned int val = READ_ONCE(*valp);
*lvalp = (unsigned long)val;
}
return 0;
@@ -492,12 +492,12 @@ static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
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;
@@ -729,7 +729,7 @@ int proc_dobool(struct ctl_table *table, int write, void *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.
+ * values from/to the user buffer, treated as an ASCII string.
*
* Returns 0 on success.
*/
@@ -857,7 +857,7 @@ static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
if ((param->min && *param->min > tmp) ||
(param->max && *param->max < tmp))
return -EINVAL;
- *valp = tmp;
+ WRITE_ONCE(*valp, tmp);
}
return 0;
@@ -923,7 +923,7 @@ static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
(param->max && *param->max < tmp))
return -ERANGE;
- *valp = tmp;
+ WRITE_ONCE(*valp, tmp);
}
return 0;
@@ -1007,13 +1007,13 @@ int proc_dou8vec_minmax(struct ctl_table *table, int write,
tmp.maxlen = sizeof(val);
tmp.data = &val;
- val = *data;
+ val = READ_ONCE(*data);
res = do_proc_douintvec(&tmp, write, buffer, lenp, ppos,
do_proc_douintvec_minmax_conv, &param);
if (res)
return res;
if (write)
- *data = val;
+ WRITE_ONCE(*data, val);
return 0;
}
EXPORT_SYMBOL_GPL(proc_dou8vec_minmax);
@@ -1090,9 +1090,9 @@ static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table,
err = -EINVAL;
break;
}
- *i = val;
+ WRITE_ONCE(*i, val);
} else {
- val = convdiv * (*i) / convmul;
+ val = convdiv * READ_ONCE(*i) / convmul;
if (!first)
proc_put_char(&buffer, &left, '\t');
proc_put_long(&buffer, &left, val, false);
@@ -1173,9 +1173,12 @@ static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
if (write) {
if (*lvalp > INT_MAX / HZ)
return 1;
- *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
+ if (*negp)
+ WRITE_ONCE(*valp, -*lvalp * HZ);
+ else
+ WRITE_ONCE(*valp, *lvalp * HZ);
} else {
- int val = *valp;
+ int val = READ_ONCE(*valp);
unsigned long lval;
if (val < 0) {
*negp = true;
@@ -1221,9 +1224,9 @@ static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
if (jif > INT_MAX)
return 1;
- *valp = (int)jif;
+ WRITE_ONCE(*valp, (int)jif);
} else {
- int val = *valp;
+ int val = READ_ONCE(*valp);
unsigned long lval;
if (val < 0) {
*negp = true;
@@ -1237,6 +1240,30 @@ static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
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
@@ -1246,7 +1273,7 @@ static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
* @ppos: file position
*
* Reads/writes up to table->maxlen/sizeof(unsigned int) integer
- * values from/to the user buffer, treated as an ASCII string.
+ * 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.
*
@@ -1259,6 +1286,17 @@ int proc_dointvec_jiffies(struct ctl_table *table, int write,
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, &param);
+}
+
/**
* proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
* @table: the sysctl table
@@ -1268,8 +1306,8 @@ int proc_dointvec_jiffies(struct ctl_table *table, int write,
* @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
+ * 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.
@@ -1277,8 +1315,8 @@ int proc_dointvec_jiffies(struct ctl_table *table, int write,
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);
+ return do_proc_dointvec(table, write, buffer, lenp, ppos,
+ do_proc_dointvec_userhz_jiffies_conv, NULL);
}
/**
@@ -1291,8 +1329,8 @@ int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
* @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
+ * 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.
@@ -1523,6 +1561,12 @@ int proc_dointvec_jiffies(struct ctl_table *table, int write,
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)
{
@@ -2017,7 +2061,7 @@ static struct ctl_table kern_table[] = {
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
-#if defined(CONFIG_TREE_RCU)
+#ifdef CONFIG_TREE_RCU
{
.procname = "panic_on_rcu_stall",
.data = &sysctl_panic_on_rcu_stall,
@@ -2027,8 +2071,6 @@ static struct ctl_table kern_table[] = {
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
-#endif
-#if defined(CONFIG_TREE_RCU)
{
.procname = "max_rcu_stall_to_panic",
.data = &sysctl_max_rcu_stall_to_panic,
@@ -2091,6 +2133,17 @@ static struct ctl_table vm_table[] = {
.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",
@@ -2107,15 +2160,6 @@ static struct ctl_table vm_table[] = {
.mode = 0644,
.proc_handler = &hugetlb_mempolicy_sysctl_handler,
},
- {
- .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
{
.procname = "hugetlb_shm_group",
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 09:04:54 +0000