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bash 3.2.39 -- race condition


From: Douglas Moyes
Subject: bash 3.2.39 -- race condition
Date: Wed, 25 Nov 2009 16:35:02 -0800
User-agent: Thunderbird 2.0.0.23 (X11/20090817)

I nearly brought down a server today.

# alias d="perl-script "
....

# d() {
# perl-script $1 |grep something|cut -d ' ' -f 3
# }
# d something
..... ..... .... CRASH

turns out bash went into a loop calling d over and over again, which resulted in thousands of grep, bash, and -d processes being executed. It wasn't pretty.





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