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Re: Weird SSH attack last night and this morning (still ongoing)

from [Valdis . Kletnieks] Network Security [Permanent Link]
Subject: Re: Weird SSH attack last night and this morning (still ongoing)
Date: Fri, 16 May 2008 17:49:07 -0400 
On Fri, 16 May 2008 17:19:16 EDT, dxp said:


Correction, one would only need to generate the amount of keys which
would equal the size of maximum PID value on Linux based system
(PID_MAX_DEFAULT).  That equals to 32768 (2^15) on 32bit platform or
more precisely on LP32 data model systems.


That would be very nice, except that many of us are on 64-bit platforms
and can set /proc/sys/kernel/pid_max much higher. include/linux/threads.h says:


/*
 * This controls the default maximum pid allocated to a process
 */
#define PID_MAX_DEFAULT (CONFIG_BASE_SMALL ? 0x1000 : 0x8000)

/*
 * A maximum of 4 million PIDs should be enough for a while.
 * [NOTE: PID/TIDs are limited to 2^29 ~= 500+ million, see futex.h.]
 */
#define PID_MAX_LIMIT (CONFIG_BASE_SMALL ? PAGE_SIZE * 8 :         
(sizeof(long) > 4 ? 4 * 1024 * 1024 : PID_MAX_DEFAULT))

Attachment: pgppEDeruKWRU.pgp
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