From 4b23c24bc8ec84ab443df42c9fdfc74de964febb Mon Sep 17 00:00:00 2001 From: Jake Ehrlich Date: Tue, 17 Sep 2019 00:34:41 +0000 Subject: [libFuzzer] Always print DSO map on Fuchsia libFuzzer launch Fuchsia doesn't have /proc/id/maps, so it relies on the kernel logging system to provide the DSO map to be able to symbolize in the context of ASLR. The DSO map is logged automatically on Fuchsia when encountering a crash or writing to the sanitizer log for the first time in a process. There are several cases where libFuzzer doesn't encounter a crash, e.g. on timeouts, OOMs, and when configured to print new PCs as they become covered, to name a few. Therefore, this change always writes to the sanitizer log on startup to ensure the DSO map is available in the log. Author: aarongreen Differential Revision: https://reviews.llvm.org/D66233 llvm-svn: 372056 --- compiler-rt/lib/fuzzer/FuzzerExtFunctions.def | 1 + 1 file changed, 1 insertion(+) (limited to 'compiler-rt/lib/fuzzer/FuzzerExtFunctions.def') diff --git a/compiler-rt/lib/fuzzer/FuzzerExtFunctions.def b/compiler-rt/lib/fuzzer/FuzzerExtFunctions.def index 7b53b085560..51edf8444e9 100644 --- a/compiler-rt/lib/fuzzer/FuzzerExtFunctions.def +++ b/compiler-rt/lib/fuzzer/FuzzerExtFunctions.def @@ -33,6 +33,7 @@ EXT_FUNC(__sanitizer_install_malloc_and_free_hooks, int, (void (*malloc_hook)(const volatile void *, size_t), void (*free_hook)(const volatile void *)), false); +EXT_FUNC(__sanitizer_log_write, void, (const char *buf, size_t len), false); EXT_FUNC(__sanitizer_purge_allocator, void, (), false); EXT_FUNC(__sanitizer_print_memory_profile, void, (size_t, size_t), false); EXT_FUNC(__sanitizer_print_stack_trace, void, (), true); -- cgit v1.2.3