void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen, void **context)
{
- size_t l, len;
-
if (!table->data || !table->maxlen)
return -ENOTDIR;
if (oldval && oldlenp) {
- if (get_user(len, oldlenp))
+ size_t bufsize;
+ if (get_user(bufsize, oldlenp))
return -EFAULT;
- if (len) {
- l = strlen(table->data)+1;
- if (len > l) len = l;
- if (len >= table->maxlen)
+ if (bufsize) {
+ size_t len = strlen(table->data), copied;
+
+ /* This shouldn't trigger for a well-formed sysctl */
+ if (len > table->maxlen)
len = table->maxlen;
- if(copy_to_user(oldval, table->data, len))
+
+ /* Copy up to a max of bufsize-1 bytes of the string */
+ copied = (len >= bufsize) ? bufsize - 1 : len;
+
+ if (copy_to_user(oldval, table->data, copied) ||
+ put_user(0, (char __user *)(oldval + copied)))
return -EFAULT;
- if(put_user(len, oldlenp))
+ if (put_user(len, oldlenp))
return -EFAULT;
}
}
if (newval && newlen) {
- len = newlen;
+ size_t len = newlen;
if (len > table->maxlen)
len = table->maxlen;
if(copy_from_user(table->data, newval, len))
len--;
((char *) table->data)[len] = 0;
}
- return 0;
+ return 1;
}
/*