CentOS7でSystemdがメモリリークしていて使用率がジワジワと上昇していた - YOMON8.NET
ほとんどサービス動いてないサーバが急にメモリ使用率の警告出したので調べて見たら、1日に30MBくらい、1ヵ月で1GBくらいジワジワとSystemdがメモリリークしていたという話です。 事象 Systemdが異常にメモリを使っている。 $ ps aux | head USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 1 0.2 60.9 2327496 2207392 ? Ss 1月15 191:31 /usr/lib/systemd/systemd --switched-root --system --deserialize 21 root 2 0.0 0.0 0 0 ? S 1月15 0:00 [kthreadd] ... 何も動いていないのに2GBも何に使っているの？となった。 原因 結論から言うと、こちらのバグが原
Phishing Protection — Comparing DNS Security Filters
I was reading an article from Brian Krebs about the Real Jokers Stash and the crazy stuff that goes into the darkweb / cybercrime forums that sell and buy credit cards and personal information online. Reading through his site, I also found an interesting article about typo domains redirecting visitors to a "crap load of bad content" (if I have to say it nicely). A group of criminals registered dom
MineMeld
Orchestrate threat intelligence and enforce new prevention-based controls. In order to prevent successful cyberattacks, many organizations collect indicators of compromise (IOCs) from various threat intelligence providers with the intent of creating new controls for their security devices. Unfortunately, legacy approaches to aggregation and enforcement are highly manual in nature, often creating c
The qmail security guarantee
D. J. Bernstein Internet mail qmail The qmail security guarantee In March 1997, I offered $500 to the first person to publish a verifiable security hole in the latest version of qmail: for example, a way for a user to exploit qmail to take over another account. My offer still stands. Nobody has found any security holes in qmail. Of course, ``security hole in qmail'' does not include problems outsi
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