diff options
| author | van Hauser <vh@thc.org> | 2019-07-20 09:06:47 +0200 |
|---|---|---|
| committer | van Hauser <vh@thc.org> | 2019-07-20 09:06:47 +0200 |
| commit | 322b5a736b2c84957c985cfffcb6bfc9470c0045 (patch) | |
| tree | a636812d3050e828aae2ca5f12b4a6ba19ea800d /gcc_plugin | |
| parent | 907c054142ce7c72a0050ac3963d82a59c5e4f0a (diff) | |
| download | afl++-322b5a736b2c84957c985cfffcb6bfc9470c0045.tar.gz | |
updated docs and crash issues with gcc_plugin
Diffstat (limited to 'gcc_plugin')
| -rw-r--r-- | gcc_plugin/CRASH | 23 | ||||
| -rw-r--r-- | gcc_plugin/README.gcc | 6 | ||||
| -rw-r--r-- | gcc_plugin/afl-gcc-pass.so.cc | 9 |
3 files changed, 36 insertions, 2 deletions
diff --git a/gcc_plugin/CRASH b/gcc_plugin/CRASH new file mode 100644 index 00000000..51930bb3 --- /dev/null +++ b/gcc_plugin/CRASH @@ -0,0 +1,23 @@ +to reproduce: +============= +tiff-4.0.4.tar.gz +CC=afl-gcc-fast CXX=afl-g++-fast ./configure --disable-shared +make + +result +====== +[+] Instrumented 11 locations in TIFFInitJPEG +during GIMPLE pass: evrp +tif_jpeg.c: In function ‘JPEGFixupTagsSubsamplingSec’: +tif_jpeg.c:2388:1: internal compiler error: Segmentation fault + } + ^ +0x7ffff758e83f ??? + /build/glibc-vjB4T1/glibc-2.28/signal/../sysdeps/unix/sysv/linux/x86_64/sigaction.c:0 +0x7ffff757b09a __libc_start_main + ../csu/libc-start.c:308 +Please submit a full bug report, +with preprocessed source if appropriate. +Please include the complete backtrace with any bug report. +See <file:///usr/share/doc/gcc-8/README.Bugs> for instructions. +make[2]: *** [Makefile:696: tif_jpeg.lo] Error 1 diff --git a/gcc_plugin/README.gcc b/gcc_plugin/README.gcc index fe62020b..a002c741 100644 --- a/gcc_plugin/README.gcc +++ b/gcc_plugin/README.gcc @@ -5,6 +5,12 @@ Fast GCC-based instrumentation for afl-fuzz (See ../docs/README for the general instruction manual.) (See ../llvm_mode/README.llvm for the LLVM-based instrumentation.) + +!!! +!!! gcc_plugin is not stable yet and can crash when compiling +!!! + + 1) Introduction --------------- diff --git a/gcc_plugin/afl-gcc-pass.so.cc b/gcc_plugin/afl-gcc-pass.so.cc index 8d1888ef..b1ca8325 100644 --- a/gcc_plugin/afl-gcc-pass.so.cc +++ b/gcc_plugin/afl-gcc-pass.so.cc @@ -1,7 +1,9 @@ // -// There are two TODOs in this file: +// There are some TODOs in this file: // - dont instrument blocks that are uninterested // - implement whitelist feature +// - implement notZero +// - fix crash // /* @@ -102,7 +104,7 @@ static unsigned int ext_call_instrument(function *fun) { if (!fcnt_blocks++) continue; /* skip block 0 */ - // TODO: if the predecessor does not have to destinations + // TODO: if the predecessor does not have ast least two destinations // then skip this block :TODO /* Bail on this block if we trip the specified ratio */ @@ -223,6 +225,9 @@ static unsigned int inline_instrument(function *fun) { g = gimple_build_assign(tmp3, PLUS_EXPR, tmp2, one); gimple_seq_add_stmt(&seq, g); // tmp3 = tmp2 + 1 + // TODO: neverZero: here we have to check if tmp3 == 0 + // and add 1 if so + // tree tmp4 = create_tmp_var(map_type, "tmp4"); // g = gimple_build_assign(tmp4, PLUS_EXPR, map_ptr_g, area_off); // gimple_seq_add_stmt(&seq, g); // tmp4 = __afl_area_ptr + area_off |