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Diffstat (limited to 'docs/env_variables.txt')
| -rw-r--r-- | docs/env_variables.txt | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/docs/env_variables.txt b/docs/env_variables.txt index 93066dbc..821463ae 100644 --- a/docs/env_variables.txt +++ b/docs/env_variables.txt @@ -245,9 +245,19 @@ The QEMU wrapper used to instrument binary-only code supports several settings: - Setting AFL_INST_LIBS causes the translator to also instrument the code inside any dynamically linked libraries (notably including glibc). + - Setting AFL_COMPCOV_LEVEL enables the CompareCoverage tracing of all cmp + and sub in x86 and x86_64 and memory comparions functions (e.g. strcmp, + memcmp, ...) when libcompcov is preloaded using AFL_PRELOAD. + More info at qemu_mode/libcompcov/README.compcov. + There are two levels at the moment, AFL_COMPCOV_LEVEL=1 that instruments + only comparisons with immediate values / read-only memory and + AFL_COMPCOV_LEVEL=2 that instruments all the comparions. Level 2 is more + accurate but may need a larger shared memory. + - Setting AFL_QEMU_COMPCOV enables the CompareCoverage tracing of all - cmp and sub in x86 and x86_64. Support for other architectures and - comparison functions (mem/strcmp et al.) is planned. + cmp and sub in x86 and x86_64. + This is an alias of AFL_COMPCOV_LEVEL=1 when AFL_COMPCOV_LEVEL is + not specified. - The underlying QEMU binary will recognize any standard "user space emulation" variables (e.g., QEMU_STACK_SIZE), but there should be no @@ -260,10 +270,7 @@ The QEMU wrapper used to instrument binary-only code supports several settings: - AFL_ENTRYPOINT allows you to specify a specific entrypoint into the binary (this can be very good for the performance!). The entrypoint is specified as hex address, e.g. 0x4004110 - - - AFL_QEMU_COMPCOV is for a sub-project in qemu_mode called ./libcompcov - which implements laf-intel for qemu. It also needs AFL_PRELOAD and - you can find more information in qemu_mode/libcompcov/README.compcov + Note that the address must be the address of a basic block. 5) Settings for afl-cmin ------------------------ |