diff options
Diffstat (limited to 'docs/linux')
| -rw-r--r-- | docs/linux/setup_ubuntu-host_qemu-vm_x86-64-kernel.md | 56 |
1 files changed, 8 insertions, 48 deletions
diff --git a/docs/linux/setup_ubuntu-host_qemu-vm_x86-64-kernel.md b/docs/linux/setup_ubuntu-host_qemu-vm_x86-64-kernel.md index 2b1301455..2bbcdd5a8 100644 --- a/docs/linux/setup_ubuntu-host_qemu-vm_x86-64-kernel.md +++ b/docs/linux/setup_ubuntu-host_qemu-vm_x86-64-kernel.md @@ -4,55 +4,15 @@ These are the instructions on how to fuzz the x86-64 kernel in a QEMU with Ubunt ## GCC -Since syzkaller requires coverage support in GCC, we need to use a recent GCC version. To checkout GCC 7.1.0 sources to `$GCC` dir: -``` bash -svn checkout svn://gcc.gnu.org/svn/gcc/trunk $GCC -cd $GCC -svn ls -v ^/tags | grep gcc_7_1_0_release -svn up -r 247494 -``` - -Unfortunately there's a typo in the source of `gcc_7_1_0_release`. Apply [this fix](https://patchwork.ozlabs.org/patch/757421/): -``` c -diff --git a/gcc/tree.h b/gcc/tree.h -index 3bca90a..fdaa7af 100644 ---- a/gcc/tree.h -+++ b/gcc/tree.h -@@ -897,8 +897,8 @@ extern void omp_clause_range_check_failed (const_tree, const char *, int, - /* If this is true, we should insert a __cilk_detach call just before - this function call. */ - #define EXPR_CILK_SPAWN(NODE) \ -- (tree_check2 (NODE, __FILE__, __LINE__, __FUNCTION__, \ -- CALL_EXPR, AGGR_INIT_EXPR)->base.u.bits.unsigned_flag) -+ (TREE_CHECK2 (NODE, CALL_EXPR, \ -+ AGGR_INIT_EXPR)->base.u.bits.unsigned_flag) - - /* In a RESULT_DECL, PARM_DECL and VAR_DECL, means that it is - passed by invisible reference (and the TREE_TYPE is a pointer to the true -``` - -Install GCC prerequisites: -``` -sudo apt-get install flex bison libc6-dev libc6-dev-i386 linux-libc-dev linux-libc-dev:i386 libgmp3-dev libmpfr-dev libmpc-dev build-essential bc -``` - -Build GCC: -``` bash -mkdir build -mkdir install -cd build/ -../configure --enable-languages=c,c++ --disable-bootstrap --enable-checking=no --with-gnu-as --with-gnu-ld --with-ld=/usr/bin/ld.bfd --disable-multilib --prefix=$GCC/install/ -make -j64 -make install -``` +Get the latest compiler from [this](/docs/syzbot.md#crash-does-not-reproduce) list and unpack into `$GCC`. -Now you should have GCC binaries in `$GCC/install/bin/`: +Now you should have GCC binaries in `$GCC/bin/`: ``` bash -$ ls $GCC/install/bin/ -c++ gcc-ar gcov-tool x86_64-pc-linux-gnu-gcc-7.0.0 -cpp gcc-nm x86_64-pc-linux-gnu-c++ x86_64-pc-linux-gnu-gcc-ar -g++ gcc-ranlib x86_64-pc-linux-gnu-g++ x86_64-pc-linux-gnu-gcc-nm -gcc gcov x86_64-pc-linux-gnu-gcc x86_64-pc-linux-gnu-gcc-ranlib +$ ls $GCC/bin/ +cpp gcc-ranlib x86_64-pc-linux-gnu-gcc x86_64-pc-linux-gnu-gcc-ranlib +gcc gcov x86_64-pc-linux-gnu-gcc-9.0.0 +gcc-ar gcov-dump x86_64-pc-linux-gnu-gcc-ar +gcc-nm gcov-tool x86_64-pc-linux-gnu-gcc-nm ``` ## Kernel @@ -93,7 +53,7 @@ make oldconfig Build the kernel with previously built GCC: ``` -make CC="$GCC/install/bin/gcc" -j64 +make CC="$GCC/bin/gcc" -j64 ``` Now you should have `vmlinux` (kernel binary) and `bzImage` (packed kernel image): |