[cfe-dev] Undefined reference to dfsan_add_label in dataflow sanitizer

[Frederico Araujo]

Thanks, Peter.


On Wed, Jun 4, 2014 at 1:05 PM, Peter Collingbourne <peter at pcc.me.uk> wrote:

> Hi Frederico,
>
> This was because of a bug in the declaration of the dfsan_add_label
> function
> (it was defined with C++ linkage instead of the expected C linkage).
> It should be fixed as of r210202.
>
> Peter
>
> On Wed, Jun 04, 2014 at 12:14:34PM -0500, Frederico Araujo wrote:
> > Hi,
> >
> > When  trying to use the function *dfsan_add_label* defined in the
> dataflow
> > sanitizer interface I get an undefined reference error. Other functions
> > such as *dfsan_create_label* and *dfsan_set_label* work fine. I can
> emulate
> > this function by using dfsan_union and fsan_set_label, but I'm curious to
> > understand why it's undefined. Any ideas?
> >
> > Here is the output of compilation with -v flag:
> >
> > clang version 3.5.0 (208131)
> > Target: x86_64-unknown-linux-gnu
> > Thread model: posix
> > Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
> > Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.2
> > Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
> > Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.0
> > Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
> >  "/usr/local/llvm/cmakebuild/bin/clang-3.5" -cc1 -triple
> > x86_64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free
> > -disable-llvm-verifier -main-file-name mrpoc.c -mrelocation-model pic
> > -pic-level 2 -pie-level 2 -mdisable-fp-elim -fmath-errno -masm-verbose
> > -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64
> > -v -resource-dir /usr/local/llvm/cmakebuild/bin/../lib/clang/3.5.0
> > -internal-isystem /usr/local/include -internal-isystem
> > /usr/local/llvm/cmakebuild/bin/../lib/clang/3.5.0/include
> > -internal-externc-isystem /usr/include/x86_64-linux-gnu
> > -internal-externc-isystem /include -internal-externc-isystem /usr/include
> > -fdebug-compilation-dir /home/frederico/dev/tests/llvm/mr -ferror-limit
> 19
> > -fmessage-length 116 -fsanitize=dataflow
> >
> -fsanitize-blacklist=/usr/local/llvm/cmakebuild/bin/../lib/clang/3.5.0/dfsan_abilist.txt
> > -mstackrealign -fobjc-runtime=gcc -fdiagnostics-show-option
> > -fcolor-diagnostics -o /tmp/mrpoc-da2ec3.o -x c mrpoc.c
> > clang -cc1 version 3.5.0 based upon LLVM 3.5.0svn default target
> > x86_64-unknown-linux-gnu
> > ignoring nonexistent directory "/include"
> > #include "..." search starts here:
> > #include <...> search starts here:
> >  /usr/local/include
> >  /usr/local/llvm/cmakebuild/bin/../lib/clang/3.5.0/include
> >  /usr/include/x86_64-linux-gnu
> >  /usr/include
> > End of search list.
> >  "/usr/bin/ld" -whole-archive
> >
> /usr/local/llvm/cmakebuild/bin/../lib/clang/3.5.0/lib/linux/libclang_rt.dfsan-x86_64.a
> > -no-whole-archive -pie -z relro --hash-style=gnu --build-id
> --eh-frame-hdr
> > -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o mrpoc
> > /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/Scrt1.o
> > /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/crti.o
> > /usr/lib/gcc/x86_64-linux-gnu/4.8/crtbeginS.o
> > -L/usr/lib/gcc/x86_64-linux-gnu/4.8
> > -L/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu
> > -L/lib/x86_64-linux-gnu -L/lib/../lib64 -L/usr/lib/x86_64-linux-gnu
> > -L/usr/lib/gcc/x86_64-linux-gnu/4.8/../../..
> > -L/usr/local/llvm/cmakebuild/bin/../lib -L/lib -L/usr/lib
> > /tmp/mrpoc-da2ec3.o -lpthread -lrt -lm -ldl
> >
> --dynamic-list=/usr/local/llvm/cmakebuild/bin/../lib/clang/3.5.0/lib/linux/libclang_rt.dfsan-x86_64.a.syms
> > -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s
> > --no-as-needed /usr/lib/gcc/x86_64-linux-gnu/4.8/crtendS.o
> > /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/crtn.o
> > /tmp/mrpoc-da2ec3.o: In function `main':
> > mrpoc.c:(.text+0xb3): undefined reference to `dfsan_add_label'
> > /tmp/mrpoc-da2ec3.o: In function `dfsw$dfsan_add_label':
> > mrpoc.c:(.text.dfsw$dfsan_add_label[dfsw$dfsan_add_label]+0xb): undefined
> > reference to `dfsan_add_label'
> > clang-3.5: error: linker command failed with exit code 1
> >
> > Thanks,
> > Fred
>
> > _______________________________________________
> > cfe-dev mailing list
> > cfe-dev at cs.uiuc.edu
> > http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
>
>
> --
> Peter
>
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