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Diffstat (limited to 'lib/nlattr.c')
-rw-r--r--lib/nlattr.c54
1 files changed, 54 insertions, 0 deletions
diff --git a/lib/nlattr.c b/lib/nlattr.c
index fb52435be42d..927c2f19f119 100644
--- a/lib/nlattr.c
+++ b/lib/nlattr.c
@@ -27,6 +27,30 @@ static const u8 nla_attr_minlen[NLA_TYPE_MAX+1] = {
[NLA_S64] = sizeof(s64),
};
+static int validate_nla_bitfield32(const struct nlattr *nla,
+ u32 *valid_flags_allowed)
+{
+ const struct nla_bitfield32 *bf = nla_data(nla);
+ u32 *valid_flags_mask = valid_flags_allowed;
+
+ if (!valid_flags_allowed)
+ return -EINVAL;
+
+ /*disallow invalid bit selector */
+ if (bf->selector & ~*valid_flags_mask)
+ return -EINVAL;
+
+ /*disallow invalid bit values */
+ if (bf->value & ~*valid_flags_mask)
+ return -EINVAL;
+
+ /*disallow valid bit values that are not selected*/
+ if (bf->value & ~bf->selector)
+ return -EINVAL;
+
+ return 0;
+}
+
static int validate_nla(const struct nlattr *nla, int maxtype,
const struct nla_policy *policy)
{
@@ -46,6 +70,12 @@ static int validate_nla(const struct nlattr *nla, int maxtype,
return -ERANGE;
break;
+ case NLA_BITFIELD32:
+ if (attrlen != sizeof(struct nla_bitfield32))
+ return -ERANGE;
+
+ return validate_nla_bitfield32(nla, pt->validation_data);
+
case NLA_NUL_STRING:
if (pt->len)
minlen = min_t(int, attrlen, pt->len + 1);
@@ -272,6 +302,30 @@ size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize)
EXPORT_SYMBOL(nla_strlcpy);
/**
+ * nla_strdup - Copy string attribute payload into a newly allocated buffer
+ * @nla: attribute to copy the string from
+ * @flags: the type of memory to allocate (see kmalloc).
+ *
+ * Returns a pointer to the allocated buffer or NULL on error.
+ */
+char *nla_strdup(const struct nlattr *nla, gfp_t flags)
+{
+ size_t srclen = nla_len(nla);
+ char *src = nla_data(nla), *dst;
+
+ if (srclen > 0 && src[srclen - 1] == '\0')
+ srclen--;
+
+ dst = kmalloc(srclen + 1, flags);
+ if (dst != NULL) {
+ memcpy(dst, src, srclen);
+ dst[srclen] = '\0';
+ }
+ return dst;
+}
+EXPORT_SYMBOL(nla_strdup);
+
+/**
* nla_memcpy - Copy a netlink attribute into another memory area
* @dest: where to copy to memcpy
* @src: netlink attribute to copy from