[AUCTeX] Preview of math / new ghostscript

[AW]

Hi,

here https://tex.stackexchange.com/questions/397147/can-not-generate-preview-by-auctex and here https://bugs.ghostscript.com/show_bug.cgi?id=698680 is a
report about lost functionality in ghostscript which reportedly prevents
AucTeX from previewing math.

Regards,

Alexander

[Mosè Giordano]

Hi Alexander,

the issue has been already reported here:
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=28811. However, I don't
know if someone besides David has a clue about how preview internally
works...

Bye,
Mosè

Post by AW
Hi,
here https://tex.stackexchange.com/questions/397147/can-not-generate-preview-by-auctex and here https://bugs.ghostscript.com/show_bug.cgi?id=698680 is a
report about lost functionality in ghostscript which reportedly prevents
AucTeX from previewing math.
Regards,
Alexander
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[David Kastrup]

Post by Mosè Giordano
Hi Alexander,
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=28811. However, I don't
know if someone besides David has a clue about how preview internally
works...

More of a problem of how Ghostscript works. It has a safer mode, and
for interactive mode, it must be possible to enter and exit it in some
manner. Ghostscript changes the details every few releases. I think
that the last few changes had been tracked and fixed by Ralf.

[Ralf Angeli]

Post by David Kastrup
More of a problem of how Ghostscript works. It has a safer mode, and
for interactive mode, it must be possible to enter and exit it in some
manner. Ghostscript changes the details every few releases. I think
that the last few changes had been tracked and fixed by Ralf.

That might be, but I doubt my fixes had much to do with the internals of
Ghostscript. So I'm sorry to say that I won't be of much help here.

[David Kastrup]

Post by Ralf Angeli

Post by David Kastrup
More of a problem of how Ghostscript works. It has a safer mode, and
for interactive mode, it must be possible to enter and exit it in
some manner. Ghostscript changes the details every few releases. I
think that the last few changes had been tracked and fixed by Ralf.

That might be, but I doubt my fixes had much to do with the internals
of Ghostscript. So I'm sorry to say that I won't be of much help
here.

I committed a fix to master. It turned out after quite a bit of back
and forth that the details I remembered were stale: preview-latex had
already previously been engineered to not requiring coming back from
SAFER mode once entered.

So .runandhide was no longer used in a security-relevant manner and
could be replaced by code that did the hiding "in plain sight", namely a
variable. That's ugly but not an exploit as it would have been in the
case I remembered: as opposed to how it was in olden times, the hidden
expression cannot be used for jail breaking.

So it turns out I engaged my less than convincing shark teethed charm
more than called for (for the purposes of AUCTeX at least) this time.