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From: Szabolcs Nagy <nsz@port70.net>
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Subject: Re: install.sh is wrong with libc.so
Date: Wed, 15 Jan 2014 13:13:52 +0100
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* orc <orc@sibserver.ru> [2014-01-15 16:42:08 +0800]:
> umask 077
> cat < lib/libc.so > /lib/libc.so.tmp.pid # /lib/libc.so.tmp.pid is created with mode 600
> mv -f /lib/libc.so.tmp.pid /lib/libc.so
> chmod 755 /lib/libc.so # failed with "Permission denied"
> 
> After that the system is unusable and requires external assistance.

this is why you should have chmod statically linked

but this should be fixed so there is no window during
the update where dynamically linked binaries fail