From 75a7c5e2d1f09a4a58e7e1f1f4ef0b0f55a33413 Mon Sep 17 00:00:00 2001 From: Dmitry Vyukov Date: Mon, 19 Feb 2018 19:35:04 +0100 Subject: prog: rework address allocation 1. mmap all memory always, without explicit mmap calls in the program. This makes lots of things much easier and removes lots of code. Makes mmap not a special syscall and allows to fuzz without mmap enabled. 2. Change address assignment algorithm. Current algorithm allocates unmapped addresses too frequently and allows collisions between arguments of a single syscall. The new algorithm analyzes actual allocations in the program and places new arguments at unused locations. --- executor/executor_akaros.cc | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'executor/executor_akaros.cc') diff --git a/executor/executor_akaros.cc b/executor/executor_akaros.cc index 90b589e77..fc28fb8f7 100644 --- a/executor/executor_akaros.cc +++ b/executor/executor_akaros.cc @@ -12,6 +12,8 @@ #include "syscalls_akaros.h" +#include + uint32 output; int main(int argc, char** argv) @@ -21,6 +23,10 @@ int main(int argc, char** argv) return 0; } + if (mmap((void*)SYZ_DATA_OFFSET, SYZ_NUM_PAGES * SYZ_PAGE_SIZE, PROT_READ | PROT_WRITE, + MAP_ANON | MAP_PRIVATE | MAP_FIXED, -1, 0) != (void*)SYZ_DATA_OFFSET) + fail("mmap of data segment failed"); + use_temporary_dir(); install_segv_handler(); setup_control_pipes(); -- cgit mrf-deployment