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Ed Alley
alley1 at llnl.gov
Tue Sep 2 12:37:28 PDT 2003
> On Tue, 2003-09-02 at 14:32, Ed Alley wrote:
>> I'm running FreeBSD-4.8. Sometimes the file permissions for /dev/null get
>> mysteriously changed by some unknown process to:
>>
>> crw------- 1 root wheel 2, 2 Sep 2 11:20 /dev/null
> On Tue, 2003-09-02 Adam McLaurin wrote:
> That's very strange indeed. Have you tried using chflags to prevent the
> permissions from being changed? This should do the trick, albeit a dirty
> hack.
Sorry, I didn't mention that I tried setting flags on /dev/null:
chflags schg /dev/null
What happens is that sendmail complains that it can't open /dev/null.
Hey! I just realized that this may be a clue! Does sendmail fiddle with
/dev/null? What happens if sendmail tries to lock /dev/null after it
opens it? Does schg prevent fcntl from locking /dev/null, if that is
what sendmail uses?
Ed Alley
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