In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
hwmon: (pmbus) Fix type confusion in notification logic<\/p>\n
Sashiko reports:<\/p>\n
At the start of the loop in pmbus_notify(), the code unconditionally casts
\nevery attribute to a struct sensor_device_attribute:<\/p>\n
drivers\/hwmon\/pmbus\/pmbus_core.c:pmbus_notify() {
\n for (i = 0; i num_attributes; i++) {
\n struct device_attribute *da = to_dev_attr(data->group.attrs[i]);
\n struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
\n int index = attr->index;
\n…
\n}<\/p>\n
However, data->group.attrs can contain other types like struct
\npmbus_samples_reg or struct pmbus_sensor, which only embed a base
\nstruct device_attribute.<\/p>\n
If da is a struct pmbus_samples_reg, dev_attr is the last member. Casting
\nit to struct sensor_device_attribute and reading the index field appears
\nto access memory past the end of the allocation, which might trigger a
\nslab-out-of-bounds read.<\/p>\n
Additionally, if da is a struct pmbus_sensor, casting it causes the index
\nfield to overlap with the page, phase, and reg fields. Could this produce
\na garbage mask on little-endian systems that spuriously matches the target
\nreg, page, and flags during an alert?<\/p>\n
Fix the problem by using struct sensor_device_attr in struct pmbus_sensor
\nand struct pmbus_label. Since those attributes never trigger a
\nnotification, set the value of attr->index to -1 for them. Use this value
\nto distinguish from boolean attributes which _can_ trigger a notification
\nand use the index field to encode mask, page, and register values.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
hwmon: (pmbus) Fix type confusion in notification logic<\/p>\n
Sashiko reports:<\/p>\n
At the start of the loop in pmbus_notify(), the code unc<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-11279","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/11279","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=11279"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=11279"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=11279"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}