Hanging processes with Linux Security 11.00 on RHEL/CentOS 7.x

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right: 15px; border-left: 1px solid #fff; height: 65px; width: 50px; top: 0; z-index: 20;} .Hamburger {display:block;position: absolute; top: 8px; left: calc(100% - 21px); top: 9px; z-index: 20;-webkit-box-align: center; -webkit-box-pack: center;-webkit-user-select: none; align-items: center; background: transparent; border: none; border-radius: 0;cursor: pointer;justify-content: center; outline: none;transition: .35s;} .Hamburger-menuXcross {height: 22px; padding: 0; width: 22px;} .Hamburger-menuLines {-o-transition: .35s;-webkit-transition: .35s; background-color: #fff; border-radius: 2px; display: inline-block; height: 2px; position: relative; transition: .35s; width: 22px;} .Hamburger-menuLines::before {top: 5.5px;} .Hamburger-menuLines::after {top: -6.28571px;} .Hamburger-menuLines::after, .Hamburger-menuLines::before {-ms-transform-origin: 5.5px center;-o-transition: .35s;-webkit-transform-origin: 5.5px center;-webkit-transition: .35s;background-color: #fff;border-radius: 2px; content: ""; 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margin: auto; color:white} #signin a {text-decoration: none; color:white;} .header-top-links, .bottom-header {display: none} .banner-middleContainer_f1l0wf96 {box-shadow: inset 0 10px 10px -10px #000;} #homeLink, #helpForumsLink, #FaqsLink, #userguidesLink, #supportLink, .header-right {width:100%; text-align: left; margin: 0; } #userguidesLink, #supportLink {border-top: 1px solid #dfdfdf;} .top-header-link {text-transform: uppercase; font-weight:700; color:#1e1e1e; padding:0 15px; margin-bottom: 0; line-height: 2em;} .header-bottom-link::after {background:none;} .header-bottom-item .header-bottom-link {margin:0 25px} .depth-1-list, .depth-2-list, .depth-3-list {list-style: none; margin: 0; padding:0 0 0 40px} .kb-lang-title {text-align:left;} #kb-menu-dropdown .depth-2-list.open {padding-left:30px} .depth-1-list a, .depth-2-list a, .depth-3-list a {color:#1e1e1e} .smdropdown-alt {line-height: 0; margin:0 padding: 0 0 10px 0;} .smdropdown-link {color:#acacac!important; font-style: italic;} .depth-1-list, .depth-2-list, .depth-3-list {display: none} .header-right {float: right;padding: 3px; height: 30px; border-radius: 3px; background:#0014a0; padding:10px 20px 10px 0; text-align: right;} #profiledropdown {width: 30px; float: right;} #profiledropdown:hover {background: none} #profiledropdown:hover #profile-menu {display: none} #profileicon {margin-top:2px} #profile-menu {display: none; position: absolute; left: 5%; background: white; width: 90%; text-align: left; z-index: 400; border: 1px solid #dfdfdf; border-radius: 3px; box-shadow: 0 5px 5px #dedede;} .open {display: block;} .Footer .col {display: block; width:90%; padding: 0 20px 15px 20px} .Footer .col.col-copyRight, .Footer .col.col-social {width:90%} footer .container {width:95%} .col.footer-logo-wrap {text-align: center;} .col-copyRight a, .social-icons-wrap a {padding: 10px 0 0 0;} .Footer .footer-links-wrap .col:nth-child(2), .Footer .footer-links-wrap .col:nth-child(3), .Footer .footer-links-wrap .col:nth-child(4) {border-bottom:1px solid #c4c4c4; border-right:none} } @media screen and (min-width:992px){ .Hamburger, #homeLink .top-header-link, #userguidesLink, #supportLink, .smdropdown-alt {display: none;} .bottom-header {display: block;} .header-top-link::after {background: #fff;} header .row:nth-child(2) {background-color:white; 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margin: 0 0 0 -230px; border: 1px solid #c4c4c4; border-radius: 5px; box-shadow: 0 4px 4px rgba(0,0,0,.1);} #menu-dropdown, #menu-dropdown .depth-2-list, #menu-dropdown .depth-3-list, #kb-menu-dropdown, #kb-menu-dropdown .depth-2-list, #profile-menu {display:none;} #helpForumsLink:hover #menu-dropdown, #FaqsLink:hover #kb-menu-dropdown, #profiledropdown:hover #profile-menu {display: block;} #menu-dropdown .depth-1-item:hover .depth-2-list, #menu-dropdown .depth-2-item:hover .depth-3-list, #kb-menu-dropdown .depth-1-item:hover .depth-2-list { display: block; left: calc(100%); background: #fff; border: 1px solid #c4c4c4; position: absolute; top: -1px; width: 100%;} #menu-dropdown .depth-1-item:nth-child(3) .depth-2-list {top:52px} .depth-1-item:hover, .depth-2-item:hover, .depth-3-item:hover {pointer:cursor;background-color:#f8f8f8} .depth-1-item:hover .depth-1-url, .depth-2-item:hover .depth-2-url, .depth-3-item:hover .depth-3-url, #kb-menu-dropdown .depth-2-item:hover .depth-3-url {color:#0014a0} .header-right {float: right; margin: 10px 48px 0 0; padding: 3px; height: 30px; border-radius: 3px;} #profiledropdown {padding: 2px; border-radius: 3px; margin-top: -3px;} }

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Hanging processes with Linux Security 11.00 on RHEL/CentOS 7.x - F-Secure Community

Hanging processes with Linux Security 11.00 on RHEL/CentOS 7.x

Symptoms

Linux Security 11.00 on RHEL/CentOS 7.x causes processes to hang when on-access scanning is turned on. The system log warns about one or more processes being blocked for more than 120 seconds.

Diagnosis

The Linux kernel version (3.10) used by RHEL/CentOS 7.x suffers from a subtle but serious bug that has been fixed in later kernel versions.

Specifically, the function fanotify_merge() has a faulty logic that replaces fsnotify_event when test_event->refcnt is 2. The original test_event is replaced with a clone and then removed from the notification queue. If the original test_event was carrying an OPEN_PERM event, it has no chance of being woken up again because only the clone of the event will get a response.

Solution

The bug has been fixed in RHEL/CentOS 7.x. Simply run

yum update

to get a current kernel (3.10.0-327.36.1.el7 or later) and reboot.

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