https://bugs.kde.org/show_bug.cgi?id=384729
Bug ID: 384729
Summary: __libc_freeres inhibits cross-platform valgrind
Product: valgrind
Version: 3.13.0
Platform: Fedora RPMs
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: memcheck
Assignee: jsew...@acm.org
Reporter: jrei...@bitwagon.com
Target Milestone: ---
vgpreload_core-arm-linux.so from valgrind-3.13.0-6.fc27.armv7hl demands that
the symbol __libc_freeres exist [typically found in GNU libc.so.6], which
prevents that particular valgrind from checking apps whose libraries do not
have such a symbol, such as the libraries used by Android. Many Android apps
run just fine on Linux (using the Android runtime linker, libc, libm, libdl,
etc.), and valgrind should be able to check them.
The complaint from one Android app is:
libc: CANNOT LINK EXECUTABLE "./my_app": cannot locate symbol "__libc_freeres"
referenced by "/usr/lib/valgrind/vgpreload_core-arm-inux.so"...
So, do not reference __libc_freeres directly. Make it a Weak reference (check
the pointer value; if 0 then do not use it), or do an explicit lookup
equivalent to dlsym(handle, "__libc_freeres").
===== readelf --relocs /usr/lib/valgrind/vgpreload_core-arm-linux.so
Relocation section '.rel.plt' at offset 0x3d0 contains 4 entries:
Offset Info Type Sym.Value Sym. Name
0001100c 00000316 R_ARM_JUMP_SLOT 00000000 __cxa_finalize
00011010 00000416 R_ARM_JUMP_SLOT 00000000 _ZN9__gnu_cxx9__freere
00011014 00000616 R_ARM_JUMP_SLOT 00000000 __libc_freeres
00011018 00000816 R_ARM_JUMP_SLOT 00000000 __gmon_start__
=====
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