[Bug dynamic-link/19773] replacing .so which was opened and closed, leads to segfault on next dlopen/dlsym

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=19773

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |fweimer at redhat dot com
         Resolution|---                         |INVALID
              Flags|                            |security-

--- Comment #4 from Florian Weimer <fweimer at redhat dot com> ---
There may be two separate issues here:

If the file backing a mapping is truncated, accessing the truncated part of the
mapping will result in SIGBUS.  This is probably not the case here because the
signal you report is SIGSEGV, not SIGBUS.

dlopen (and the rest of the dynamic linker) does not verify internal
consistency of ELF files.  This is a deliberate design decision, to improve
performance.  As a result, unmapped memory can be accessed if the file size
does not match expectations.

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