Re: cannot map temp file pool

[Mike McCarty <Mike.McCarty@sbcglobal.net>]

Jan Willem Stumpel wrote:
> Mike McCarty wrote:
>>GREAT! But, why did it fail in the first place?
> 
> The immediate reason has been pointed out by Bart. A change in the

[snip]

> One of the "initscripts" is /etc/init.d/mountdevsubfs.sh, which
> contains line like
> 
> (version 15, does not break dosemu)
>    SHM_OPT=
>     [ "${SHM_SIZE:=$TMPFS_SIZE}" ] &&  SHM_OPT="-osize=$SHM_SIZE"
>     domount tmpfs shmfs /dev/shm $SHM_OPT
> 
> ("improved" version 20, breaks dosemu)
>    SHM_OPT=
>     [ "${SHM_SIZE:=$TMPFS_SIZE}" ] && SHM_OPT=",size=$SHM_SIZE"
>     domount tmpfs shmfs /dev/shm -onoexec,nosuid,nodev$SHM_OPT

Ah, I see. Very clear.

> This must have been done for security reasons, although I have no
> clue about (the severity of) the security issues which are at
> stake here.

[snip]

Hmm. Self-modifying code permitting one to insert code into
a shared memory region and execute it? Difficult to catch
with a "scanner" I suppose.

Thanks for the response.

Mike
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