In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
perf sched: Fix register_pid() overflow, strcpy, and BUG_ON<\/p>\n
register_pid() has several issues when processing untrusted perf.data:<\/p>\n
1. Integer overflow: (pid + 1) * sizeof(struct task_desc *) can wrap
\n to a small value on 32-bit systems when pid is large (e.g.
\n 0x40000000), causing realloc to return a tiny buffer followed by
\n out-of-bounds writes in the initialization loop.<\/p>\n
2. Heap buffer overflow: strcpy(task->comm, comm) copies the
\n untrusted comm string into a fixed 20-byte COMM_LEN buffer with
\n no length check.<\/p>\n
3. BUG_ON on allocation failure: perf.data is untrusted input, so
\n allocation failures should be handled gracefully rather than
\n killing the process.<\/p>\n
4. Realloc of sched->tasks assigned directly back, leaking the old
\n pointer on failure; nr_tasks incremented before the realloc,
\n leaving corrupted state on failure.<\/p>\n
Cap pid at PID_MAX_LIMIT (4194304, matching the kernel’s maximum
\non 64-bit), replace strcpy with strlcpy, guard against NULL comm,
\nreplace BUG_ON with NULL returns using safe realloc patterns, and
\nadd NULL checks in callers that dereference the result.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
perf sched: Fix register_pid() overflow, strcpy, and BUG_ON<\/p>\n
register_pid() has several issues when processing untrusted perf.data:<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-12330","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/12330","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=12330"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=12330"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=12330"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}