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From: "stsp at users dot sourceforge.net"
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To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/30007] rfe: dlopen to specified address
Date: Sun, 19 Mar 2023 02:37:52 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30007

--- Comment #17 from Stas Sergeev <stsp at users dot sourceforge.net> ---
Note that even the parts that were
initially file-backed, are later
re-evaluates as anonymous space.
Such pages are re-protected to
R/W and zeroed out with memset().
That includes .bss.
I believe its a quite bad solution,
as in /proc/self/maps it would remain
file-backed.
After my patch there are no such
discrepancies, as the first mmap
is always anonymous after my patch.
So you don't even need to clear .bss. :)

Hope this clarifies why intercepting
the first mmap doesn't give you anything.

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