In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
Input: zero ff_effect before compat copy in input_ff_effect_from_user<\/p>\n
In the compat path input_ff_effect_from_user() aliases the caller’s
\nnative struct ff_effect with the smaller struct ff_effect_compat and
\ncopies only the compat sized prefix:<\/p>\n
\tcompat_effect = (struct ff_effect_compat *)effect;<\/p>\n
\tif (copy_from_user(compat_effect, buffer,
\n\t\t\t sizeof(struct ff_effect_compat)))<\/p>\n
The tail of the native structure is never written. Callers pass an
\nuninitialized on-stack object, for example evdev_do_ioctl() for
\nEVIOCSFF, so those bytes keep their previous stack contents.
\ninput_ff_upload() then stores the full native structure in
\nff->effects[id], from where a uinput based force feedback daemon can
\nread it back via UI_BEGIN_FF_UPLOAD, disclosing kernel stack memory to
\nuserspace.<\/p>\n
Zero the effect before the compat copy.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
Input: zero ff_effect before compat copy in input_ff_effect_from_user<\/p>\n
In the compat path input_ff_effect_from_user() aliases the c<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-33270","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/33270","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=33270"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=33270"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=33270"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}