[Bug libelf/23528] When executing ./eu-nm or ./eu-readelf -aAdehIlnrsSVcp -w, AddressSanitizer catch a double-free crash.

mark at klomp dot org sourceware-bugzilla@sourceware.org
Sat Aug 18 20:49:00 GMT 2018


Mark Wielaard <mark at klomp dot org> changed:

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

--- Comment #4 from Mark Wielaard <mark at klomp dot org> ---
commit 56b18521fb8d46d40fc090c0de9d11a08bc982fa
Author: Mark Wielaard <mark@klomp.org>
Date:   Sat Aug 18 12:42:16 2018 +0200

    libelf: Return error if elf_compress_gnu is used on SHF_COMPRESSED section.

    Compressing a section that is already compressed is fine, but useless.
    But it isn't possible to gnu compress (or decompress) a SHF_COMPRESSED
    section since there is no state kept that would tell if the section was
    first GNU compressed or first gabi compressed. Calling elf_compress_gnu
    on a section and then calling elf_compress on it to decompress it twice
    could cause a crash (the other way around is fine). Just disallow it.


    Signed-off-by: Mark Wielaard <mark@klomp.org>

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