reassign 505718 chkrootkit
severity 505718 normal
retitle 505718 Please limit grep output, can cause automatic DOS.
thanks
Hello,
While checking e.g. for php based rootkit, the invocation of grep does
not limit the amount of output returned, for example in:
fileshead=`${find} ${ROOTDIR}tmp
Hello,
* Nicolas François [Fri, Nov 14, 2008 at 08:45:57PM +0100]:
grep is line-based, so I'm not really surprised it eats all the memory
when it receives only zeroes.
What other big file did you tested this on?
A 2Gb swap file. It could be that the first newline in this file is
far from
Package: grep
Version: 2.5.1.ds2-6
Severity: important
Hello,
A grep for a simple pattern on a big file results in a similarly big
memory consumption, rendering the machine unusable as it swaps as hell
and/or a memory allocation failure occurs. E.g.:
$ grep foo /dev/zero
grep:
On Fri, Nov 14, 2008 at 5:41 PM, Laurent Fousse [EMAIL PROTECTED] wrote:
Package: grep
Version: 2.5.1.ds2-6
Severity: important
Hello,
A grep for a simple pattern on a big file results in a similarly big
memory consumption, rendering the machine unusable as it swaps as hell
and/or a
Hello,
* Aioanei Rares [Fri, Nov 14, 2008 at 05:49:35PM +0200]:
Maybe the kernel is at fault?
The particular argument `/dev/zero/' I supplied to grep in my example
is not necessary, if this is what you mean. I can reproduce it with
any big file. Since /dev/zero is infinite in size, it will
On Fri, Nov 14, 2008 at 05:03:30PM +0100, Laurent Fousse wrote:
Hello,
* Aioanei Rares [Fri, Nov 14, 2008 at 05:49:35PM +0200]:
Maybe the kernel is at fault?
The particular argument `/dev/zero/' I supplied to grep in my example
is not necessary, if this is what you mean. I can reproduce
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