[Bug dynamic-link/33797] elf: Out-of-bounds write in ld.so profiling via unvalidated self_pc

[carlos at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=33797

--- Comment #6 from Carlos O'Donell <carlos at redhat dot com> ---
Patch posted by Florian:
https://inbox.sourceware.org/libc-alpha/lhucy3aecqa.fsf@oldenburg.str.redhat.com/T/#u

I reviewed it and it looks like a good mitigation, which is to disable reading
from /var/tmp by default and force the user to actively choose a directory.

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