In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
kprobes: Skip disarmed probes when checking optkprobe overlap<\/p>\n
On x86, an optkprobe at A replaces five bytes with a jump. If a disabled
\nprobe B is at A+2, get_optimized_kprobe() stops at B when arming a new
\nprobe C at A+4. It leaves A optimized:<\/p>\n
A A+1 A+2 A+3 A+4
\n A’s jump | e9 | d0 | d1 | d2 | d3 |
\n after C | e9 | d0 | d1 | d2 | cc |<\/p>\n
The INT3 for C overwrites the last byte of A’s jump displacement, so
\nexecution can jump to the wrong address. B can have prepared optinsns
\nwhile disarmed, but has no jump to unoptimize.<\/p>\n
Continue past disarmed and unprepared probes to find the active optimized
\nprobe before arming a probe in its jump.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
kprobes: Skip disarmed probes when checking optkprobe overlap<\/p>\n
On x86, an optkprobe at A replaces five bytes with a jump. If a disa<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-41328","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/41328","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=41328"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=41328"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=41328"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}