In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
libnvdimm\/labels: Prevent integer overflow in __nd_label_validate()<\/p>\n
The on-media namespace index field nslot is a u32 read from the DIMM
\nlabel storage area. __nd_label_validate() bounds it against the config
\narea size, but sizeof_namespace_label() returns unsigned, so the product
\nnslot * label_size is evaluated in 32-bit and wraps modulo 2^32 before
\nthe comparison. A crafted nslot passes the bound and is then used as the
\nloop trip count in nd_label_data_init(), whose memset() walks off the end
\nof the config_size buffer: an out-of-bounds write.<\/p>\n
The field is not trusted — it comes from the medium, or from userspace
\nvia ND_CMD_SET_CONFIG_DATA. Evaluate the product in 64-bit so the bound
\ncheck is exact; conforming labels are unaffected.<\/p>\n
The check was safe when introduced by commit 4a826c83db4e (“libnvdimm:
\nnamespace indices: read and validate”): it multiplied by sizeof(struct
\nnd_namespace_label), a size_t, so on a 64-bit build the product did not
\nwrap. Commit 564e871aa66f (“libnvdimm, label: add v1.2 nvdimm label
\ndefinitions”) narrowed it to 32 bits when the label size became a runtime
\nvalue read via sizeof_namespace_label().<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
libnvdimm\/labels: Prevent integer overflow in __nd_label_validate()<\/p>\n
The on-media namespace index field nslot is a u32 read from th<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21481","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21481","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=21481"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21481"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21481"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}