[Bug binutils/25180] Slowness in cplus_demangle()

[tim.ruehsen at gmx dot de]

https://sourceware.org/bugzilla/show_bug.cgi?id=25180

--- Comment #2 from Tim Rühsen <tim.ruehsen at gmx dot de> ---
Hi Nick,

no mystery. But a possible DoS vector and in the end just an example that
demangling may take longer as expected (and possibly necessary).

Smaller and 'real-world' input may have the same issue just on a much smaller
scale - so I wonder if this an 'easy-to-fix' code flaw or an 'fixed' design
(flaw).

Such a CPU hog also prevents proper fuzzing, thus it prevents finding other
bugs.

You sound like this is a well-known behavior of the demangler and nothing can
be done. If that is the case, then sorry for not knowing. Feel free to close
the issue :-)

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