In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf,fork: wipe ->bpf_storage before bailouts that access it<\/p>\n
Currently, copy_process() can bail out to free_task() before p->bpf_storage
\nhas been initialized, with this call graph (shown here for the
\n!CONFIG_MEMCG case):<\/p>\n
copy_process
\n dup_task_struct
\n arch_dup_task_struct
\n [copies the entire task_struct, including ->bpf_storage member]
\n [RLIMIT_NPROC check fails]
\n delayed_free_task
\n free_task
\n bpf_task_storage_free
\n rcu_dereference(task->bpf_storage)
\n bpf_local_storage_destroy<\/p>\n
In this case, the nascent task’s ->bpf_storage member that
\nbpf_local_storage_destroy() operates on is a plain copy of the parent’s
\n->bpf_storage pointer, not a real initialized pointer.
\nThis leads to badness (kernel hangs, UAF).<\/p>\n
This is reachable as long as the process calling fork() has been inserted
\ninto a task storage map.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf,fork: wipe ->bpf_storage before bailouts that access it<\/p>\n
Currently, copy_process() can bail out to free_task() before p->bpf_st<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-6778","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/6778","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=6778"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6778"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6778"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}