[Bug ld/18646] New: function pointer values are still interposed with -Bsymbolic-functions on ARM

[michael.hudson at canonical dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18646

            Bug ID: 18646
           Summary: function pointer values are still interposed with
                    -Bsymbolic-functions on ARM
           Product: binutils
           Version: 2.26 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: michael.hudson at canonical dot com
  Target Milestone: ---

Created attachment 8422
  --> https://sourceware.org/bugzilla/attachment.cgi?id=8422&action=edit
fix ported from aarch64

If this code is in a shared library, linked with -Bsymbolic-functions ld.bfd on
arm (32):

#include <stdio.h>
#include "dep.h"

int interpos(void) {
        return 0;
}

intfunc intfuncs[] = { interpos };

intfunc
getintfunc(void) {
        return intfuncs[0];
}

void
callinterpos(void) {
        printf("calling interpos directly says %d\n", interpos());
}


and this code is in a linked executable:

#include <stdio.h>
#include "dep/dep.h"

int interpos() {
        return 1;
}

int main(int argc, char** argv) {
        callinterpos();
        printf("calling interpos via pointer says %d\n", getintfunc()());
}

then running the executable prints

calling interpos directly says 0
calling interpos via pointer says 1

when it should print 0 twice.  Luckily for me, the isomorphic bug got fixed for
aarch64 recently in
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commit;h=0941db698eba22727c9a944b5da5c76ae93cc664
and the same fix (attached) fixes the problem for ARM too.

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