[Bug gold/20983] New: commit bfbf34de2f2 (place linker-generated sections by the output section name) breaks perf

[markus at trippelsdorf dot de]

https://sourceware.org/bugzilla/show_bug.cgi?id=20983

            Bug ID: 20983
           Summary: commit bfbf34de2f2 (place linker-generated sections by
                    the output section name) breaks perf
           Product: binutils
           Version: 2.28 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gold
          Assignee: ccoutant at gmail dot com
          Reporter: markus at trippelsdorf dot de
                CC: ian at airs dot com
  Target Milestone: ---

Since:

 commit bfbf34de2f27672282d4fa4c0916cc41890dcc6c
 Author: Cary Coutant <address@hidden>
 Date:   Mon Dec 12 18:51:29 2016 -0800

    When using linker scripts, place linker-generated sections by the output
section name.

I get buffer overflows when I try to use the Linux "perf" tool.
This happens, because perf tries to parse the .notes section of the kernel
and that changed with the commit above.

Before:
address@hidden linux % readelf -n vmlinux

Displaying notes found in: .notes
  Owner                 Data size       Description
  GNU                  0x00000009       NT_GNU_GOLD_VERSION (gold version)
    Version: gold 1.12
  GNU                  0x00000014       NT_GNU_BUILD_ID (unique build ID
bitstring)
    Build ID: 32a604503e1db2e902761c8d06989839b689b012

=============================================================================

After:
address@hidden linux % readelf -n vmlinux

Displaying notes found in: .note.gnu.build-id
  Owner                 Data size       Description
  GNU                  0x00000014       NT_GNU_BUILD_ID (unique build ID
bitstring)
    Build ID: ce0c36a235743dc9f6f857c2eabe4bfcbb784f54

Displaying notes found in: .note.gnu.gold-version
  Owner                 Data size       Description
  GNU                  0x00000009       NT_GNU_GOLD_VERSION (gold version)
    Version: gold 1.12

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