Hi Team please share your suggestions about this.
I tired an online tool to check the vulnerability of spectre and meltdown, this is after upgrading 4.4.111-1 kernel version in centos 7. But its still showing in vulnerable state, im running this script in AWS instance. Please advice me. Script : https://raw.githubusercontent.com/speed47/spectre-meltdown-checker/master/spectre-meltdown-checker.sh Output : Spectre and Meltdown mitigation detection tool v0.24 Checking for vulnerabilities against live running kernel Linux 4.4.111-1.el7.elrepo.x86_64 #1 SMP Wed Jan 10 13:12:02 EST 2018 x86_64 CVE-2017-5753 [bounds check bypass] aka 'Spectre Variant 1' * Checking count of LFENCE opcodes in kernel: NO (only 35 opcodes found, should be >= 70) > STATUS: VULNERABLE (heuristic to be improved when official patches become > available) CVE-2017-5715 [branch target injection] aka 'Spectre Variant 2' * Mitigation 1 * Hardware (CPU microcode) support for mitigation: YES * Kernel support for IBRS: NO * IBRS enabled for Kernel space: NO * IBRS enabled for User space: NO * Mitigation 2 * Kernel compiled with retpoline option: NO * Kernel compiled with a retpoline-aware compiler: NO > STATUS: VULNERABLE (IBRS hardware + kernel support OR kernel with retpoline > are needed to mitigate the vulnerability) CVE-2017-5754 [rogue data cache load] aka 'Meltdown' aka 'Variant 3' * Kernel supports Page Table Isolation (PTI): YES * PTI enabled and active: YES > STATUS: NOT VULNERABLE (PTI mitigates the vulnerability) A false sense of security is worse than no security at all, see --disclaimer -- Thanks Mohammed Azfar
