Description

When I compiled qemu-system-aarch64 using afl, I got an error in AFL-CC.

......
[2882/2882] Linking target qemu-system-aarch64
FAILED: qemu-system-aarch64 
afl-clang-fast++ -m64 -mcx16 @qemu-system-aarch64.rsp
)B
[-] PROGRAM ABORT : Too many command line parameters
         Location : process_params(), src/afl-cc.c:388

Reproducer

#git clone qemu & cd
CC=afl-clang-fast CXX=afl-clang-fast++ ./configure --target-list=aarch64-softmmu --enable-sanitizers
make -j 8

Analysis

This commit introduced the problem. The maximum number of params is 1024. However, it seems easy to exceed this number when programs are linked. I changed 1024 to 2048 and compiled successfully. I wonder if AFL++ can be more flexible to solve this problem. And the previous version used argc + 128 to determine the number of params, which does not seem to cause this problem.