In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
hwmon: (pmbus\/adm1266) bounce blackbox records through a protocol-sized buffer<\/p>\n
adm1266_pmbus_block_xfer() copies the device-supplied block payload
\ninto the caller-provided buffer using the device-supplied length:<\/p>\n
\tmemcpy(data_r, &msgs[1].buf[1], msgs[1].buf[0]);<\/p>\n
The helper does not know how large data_r is and trusts the device to
\nreturn at most one record’s worth of bytes. adm1266_nvmem_read_blackbox()
\nviolates that contract: it advances read_buff inside data->dev_mem in
\nADM1266_BLACKBOX_SIZE (64-byte) strides while the helper is willing to
\nwrite up to ADM1266_PMBUS_BLOCK_MAX (255) bytes. A device that returns
\nmore than 64 bytes on the trailing record (read_buff offset 1984 in
\nthe 2048-byte dev_mem allocation) overflows dev_mem by up to 191 bytes
\nbefore the post-call<\/p>\n
\tif (ret != ADM1266_BLACKBOX_SIZE)
\n\t\treturn -EIO;<\/p>\n
can reject the response.<\/p>\n
Contain the fix in the caller without changing the helper signature:
\nread each record into a 255-byte local bounce buffer that matches the
\nhelper’s maximum output, validate the returned length, and only then
\ncopy exactly ADM1266_BLACKBOX_SIZE bytes into the dev_mem slot.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
hwmon: (pmbus\/adm1266) bounce blackbox records through a protocol-sized buffer<\/p>\n
adm1266_pmbus_block_xfer() copies the device-suppli<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-15063","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/15063","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=15063"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=15063"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=15063"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}