When random alloc_canary env var option was introduced, a possibility for use of uninitialized alloc_canary value was made.
In most cases, constructor will be called during shared library load and the alloc_canary would be initialized to either its default value or a randomly generated one if forced by AFL_RANDOM_ALLOC_CANARY env var.
However, in some cases, libraries loaded before libdislocator will make allocations (still using libdislocator's allocation functions) while alloc_canary is still uninitialized. In such cases, canary value is usually NULL.
If such allocated value is then free()'d after libdislocator's constructor has been run, call to free() will fail causing a false positive. This condition usually happens while calling library destructors at process termination.
The patch ensures the canary value is initialized in all cases, and introduces a destructor that reverts it to default value.
This does mean that certain number of early allocations will use the default canary value rather than the random one set afterwards. This seems like a reasonable tradeoff as I haven't found a surefire way of forcing libdislocator's constructor to run first in all possible cases (if nothing else, libphtread usually has priority).
* Output afl-clang-fast stuffs only if necessary (#1912)
* afl-cc header
* afl-cc common declarations
- Add afl-cc-state.c
- Strip includes, find_object, debug/be_quiet/have_*/callname setting from afl-cc.c
- Use debugf_args in main
- Modify execvp stuffs to fit new aflcc struct
* afl-cc show usage
* afl-cc mode selecting
1. compiler_mode by callname in argv[0]
2. compiler_mode by env "AFL_CC_COMPILER"
3. compiler_mode/instrument_mode by command line options "--afl-..."
4. instrument_mode/compiler_mode by various env vars including "AFL_LLVM_INSTRUMENT"
5. final checking steps
6. print "... - mode: %s-%s\n"
7. determine real argv[0] according to compiler_mode
* afl-cc macro defs
* afl-cc linking behaviors
* afl-cc fsanitize behaviors
* afl-cc misc
* afl-cc body update
* afl-cc all-in-one
formated with custom-format.py
* nits
---------
Co-authored-by: vanhauser-thc <vh@thc.org>
* changelog
* update grammar mutator
* lto llvm 12+
* docs(custom_mutators): fix missing ':' (#1953)
* Fix broken LTO mode and response file support (#1948)
* Strip `-Wl,-no-undefined` during compilation (#1952)
Make the compiler wrapper stripping `-Wl,-no-undefined` in addition to `-Wl,--no-undefined`.
Both versions of the flag are accepted by clang and, therefore, used by building systems in the wild (e.g., samba will not build without this fix).
* Remove dead code in write_to_testcase (#1955)
The custom_mutators_count check in if case is duplicate with if condition.
The else case is custom_mutators_count == 0, neither custom_mutator_list iteration nor sent check needed.
Signed-off-by: Xeonacid <h.dwwwwww@gmail.com>
* update qemuafl
* WIP: Add ability to generate drcov trace using QEMU backend (#1956)
* Document new drcov QEMU plugin
* Add link to lightkeeper for QEMU drcov file loading
---------
Co-authored-by: Jean-Romain Garnier <jean-romain.garnier@airbus.com>
* code format
* changelog
* sleep on uid != 0 afl-system-config
* fix segv about skip_next, warn on unsupported cases of linking options (#1958)
* todos
* ensure afl-cc only allows available compiler modes
* update grammar mutator
* disable aslr on apple
* fix for arm64
* help selective instrumentation
* typos
* macos
* add compiler test script
* apple fixes
* bump nyx submodules (#1963)
* fix docs
* update changelog
* update grammar mutator
* improve compiler test script
* gcc asan workaround (#1966)
* fix github merge fuckup
* fix
* Fix afl-cc (#1968)
- Check if too many cmdline params here, each time before insert a new param.
- Check if it is "-fsanitize=..." before we do sth.
- Remove improper param_st transfer.
* Avoid adding llvmnative instrumentation when linking rust sanitizer runtime (#1969)
* Dynamic instrumentation filtering for LLVM native (#1971)
* Add two dynamic instrumentation filter methods to runtime
* Always use pc-table with native pcguard
* Add make_symbol_list.py and README
* changelog
* todos
* new forkserver check
* fix
* nyx test for CI
* improve nyx docs
* Fixes to afl-cc and documentation (#1974)
* Always compile with -ldl when building for CODE_COVERAGE
When building with CODE_COVERAGE, the afl runtime contains code that
calls `dladdr` which requires -ldl. Under most circumstances, clang
already adds this (e.g. when building with pc-table), but there are some
circumstances where it isn't added automatically.
* Add visibility declaration to __afl_connected
When building with hidden visibility, the use of __AFL_LOOP inside such
code can cause linker errors due to __afl_connected being declared
"hidden".
* Update docs to clarify that CODE_COVERAGE=1 is required for dynamic_covfilter
* nits
* nyx build script updates
* test error output
* debug ci
* debug ci
* Improve afl-cc (#1975)
* update response file support
- full support of rsp file
- fix some segv issues
* Improve afl-cc
- remove dead code about allow/denylist options of sancov
- missing `if (!aflcc->have_msan)`
- add docs for each function
- typo
* enable nyx
* debug ci
* debug ci
* debug ci
* debug ci
* debug ci
* debug ci
* debug ci
* debug ci
* fix ci
* clean test script
* NO_NYX
* NO_NYX
* fix ci
* debug ci
* fix ci
* finalize ci fix
* Enhancement on Deterministic stage (#1972)
* fuzzer: init commit based on aflpp 60dc37a8cf09f8e9048e4b6a2204d6c90b27655a
* fuzzers: adding the skip variables and initialize
* log: profile the det/havoc finding
* log: add profile log output
* fuzzers: sperate log/skipdet module
* fuzzers: add quick eff_map calc
* fuzzers: add skip_eff_map in fuzz_one
* fuzzers: mark whole input space in eff_map
* fuzzers: add undet bit threshold to skip some seeds
* fuzzers: fix one byte overflow
* fuzzers: fix overflow
* fix code format
* add havoc only again
* code format
* remove log to INTROSPECTION, rename skipdet module
* rename skipdet module
* remove log to stats
* clean redundant code
* code format
* remove redundant code format check
* remove redundant doc
* remove redundant objects
* clean files
* change -d to default skipdet
* disable deterministic when using CUSTOM_MUTATOR
* revert fix
* final touches for skipdet
* remove unused var
* remove redundant eff struct (#1977)
* update QEMU-Nyx submodule (#1978)
* update QEMU-Nyx submodule (#1980)
* Fix type in AFL_NOOPT env variable in afl-cc help message (#1982)
* nits
* 2024 v4.10c release
* fixes
---------
Signed-off-by: Xeonacid <h.dwwwwww@gmail.com>
Co-authored-by: Sonic <50692172+SonicStark@users.noreply.github.com>
Co-authored-by: Xeonacid <h.dwwwwww@gmail.com>
Co-authored-by: Nils Bars <nils.bars@rub.de>
Co-authored-by: Jean-Romain Garnier <7504819+JRomainG@users.noreply.github.com>
Co-authored-by: Jean-Romain Garnier <jean-romain.garnier@airbus.com>
Co-authored-by: Sergej Schumilo <sergej@schumilo.de>
Co-authored-by: Christian Holler (:decoder) <choller@mozilla.com>
Co-authored-by: Han Zheng <35988108+kdsjZh@users.noreply.github.com>
Co-authored-by: Khaled Yakdan <yakdan@code-intelligence.com>
* libdislocator: fixing integer overflow in 'max_mem' variable and setting 'max_mem' type to 'size_t'
* libdislocator: fixing potential integer underflow in 'total_mem' variable due to its different values in different threads
