In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
perf\/ftrace: Fix WARNING in __unregister_ftrace_function<\/p>\n
perf_ftrace_function_unregister() unconditionally calls
\nunregister_ftrace_function() without checking whether the ftrace_ops
\nwas ever successfully registered. This triggers a WARN_ON in
\n__unregister_ftrace_function() when the ops doesn’t have
\nFTRACE_OPS_FL_ENABLED set.<\/p>\n
This can happen during perf_event_alloc() error cleanup when
\nperf_trace_destroy() is called via __free_event() on an event whose
\nftrace_ops registration failed or was already torn down by
\nperf_try_init_event()’s err_destroy path.<\/p>\n
The call path is:
\n perf_event_alloc() error cleanup
\n -> __free_event()
\n -> event->destroy() [tp_perf_event_destroy]
\n -> perf_trace_destroy()
\n -> perf_trace_event_close()
\n -> TRACE_REG_PERF_CLOSE
\n -> perf_ftrace_function_unregister()
\n -> unregister_ftrace_function()
\n -> __unregister_ftrace_function()
\n -> WARN_ON(!(ops->flags & FTRACE_OPS_FL_ENABLED))<\/p>\n
Fix this by checking FTRACE_OPS_FL_ENABLED before attempting to
\nunregister. If the ops is not enabled, just free the filter and
\nreturn success.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
perf\/ftrace: Fix WARNING in __unregister_ftrace_function<\/p>\n
perf_ftrace_function_unregister() unconditionally calls
\nunregister_ftrace<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-28690","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/28690","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=28690"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=28690"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=28690"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}