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[Bug libelf/21199] elf_update might "fill" over existing section data

Mark Wielaard <mark at klomp dot org> changed:

           What    |Removed                     |Added
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #2 from Mark Wielaard <mark at klomp dot org> ---
commit a3bf8f0852d0f66911dcf879c5a1fcff3cb4cb46
Author: Mark Wielaard <>
Date:   Mon Mar 27 17:01:57 2017 +0200

    libelf: Always update last_offset in updatefile and updatemmap.

    When ELF section data was used, but not updated or marked as dirty and
    there also existed non-dirty sections and some padding was needed between
    the sections (possibly because of alignment) then elf_update might write
    "fill" over some of the existing data. This happened because in that case
    the last_position was not updated correctly.

    Includes a new testcase fillfile that fails before this patch by showing
    fill instead of the expected data in some section data. It succeeds with
    this patch.

    Signed-off-by: Mark Wielaard <>

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