https://sourceware.org/bugzilla/show_bug.cgi?id=32864
Bug ID: 32864
Summary: "eu-readelf: bad dynamic symbol" error on ELF without
DT_VERSYM
Product: elfutils
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: tools
Assignee: unassigned at sourceware dot org
Reporter: cbytensky at gmail dot com
CC: elfutils-devel at sourceware dot org
Target Milestone: ---
Created attachment 16013
--> https://sourceware.org/bugzilla/attachment.cgi?id=16013&action=edit
sample program without DT_VERSYM
Overview:
eu-readelf prints error message "eu-readelf: bad dynamic symbol" on trying to
get symbol version info from ELF that doesn't have DT_VERSYM.
Steps to Reproduce:
1) Run sample program from bug attachment "hello_libc":
# eu-readelf -D --dyn-syms hello_libc
Actual Results:
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UNDEF eu-readelf: bad
dynamic symbol
1: 0000000000000000 0 FUNC GLOBAL DEFAULT UNDEF putseu-readelf:
bad dynamic symbol
Expected Results:
Same, but without "eu-readelf: bad dynamic symbol" message:
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UNDEF
1: 0000000000000000 0 FUNC GLOBAL DEFAULT UNDEF puts
Build Date & Hardware:
Linux localhost.localdomain 6.12.16-gentoo #2 SMP Fri Mar 14 14:18:41 IST 2025
x86_64 Intel(R) Core(TM) i7-8665U CPU @ 1.90GHz GenuineIntel GNU/Linux
Additional Information:
In attachment there is quick-and-dirty patch that fixes this bug for me. I
believe that "elf_getdata_rawchunk" function returns non-NULL result on NULL
"offset" parameter and so if "offs[i_versym]" is "0" (there is no DT_VERSYM in
PT_DYNAMIC) function returns non-NULL result.
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