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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/30452] New: elf/tst-map-32bit-1a fails with
 binutils-2.30-117.el8.x86_64
Date: Tue, 16 May 2023 14:13:51 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30452

            Bug ID: 30452
           Summary: elf/tst-map-32bit-1a fails with
                    binutils-2.30-117.el8.x86_64
           Product: glibc
           Version: 2.38
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
  Target Milestone: ---
            Target: x86_64-linux-gnu

For some reason, BFD ld produces load segments which are 2 MiB aligned:

  LOAD           0x000000 0x0000000000000000 0x0000000000000000 0x000ff0
0x000ff0 R E 0x200000
  LOAD           0x001e00 0x0000000000201e00 0x0000000000201e00 0x000270
0x000280 RW  0x200000

This means that the fast path in _dl_map_segment is not taken, and the
combination of address zero with MAP_DENYWRITE is never used, so MAP_32BIT
handling does not kick in.

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