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charset="utf-8" Currently, bash and C crash reproducers are be built manually. This is a problem, as we want to integrate reproducers into the tree, for regression testing. This patch adds a script that converts a sequence of QTest commands into a pasteable Bash reproducer, or a libqtest-based C program. This will try to wrap pasteable reproducers to 72 chars, but the generated C code will not have nice formatting. Therefore, the C output of this script should be piped through an auto-formatter, such as clang-format Signed-off-by: Alexander Bulekov Reviewed-by: Darren Kenny --- scripts/oss-fuzz/output_reproducer.py | 160 ++++++++++++++++++++++++++ 1 file changed, 160 insertions(+) create mode 100755 scripts/oss-fuzz/output_reproducer.py diff --git a/scripts/oss-fuzz/output_reproducer.py b/scripts/oss-fuzz/outpu= t_reproducer.py new file mode 100755 index 0000000000..3608b0600e --- /dev/null +++ b/scripts/oss-fuzz/output_reproducer.py @@ -0,0 +1,160 @@ +#!/usr/bin/env python3 +# -*- coding: utf-8 -*- + +""" +Convert plain qtest traces to C or Bash reproducers + +Use this to help build bug-reports or create in-tree reproducers for bugs. +Note: This will not format C code for you. Pipe the output through +clang-format -style=3D"{BasedOnStyle: llvm, IndentWidth: 4, ColumnLimit: 9= 0}" +or similar +""" + +import sys +import os +import argparse +import textwrap +from datetime import date + +__author__ =3D "Alexander Bulekov " +__copyright__ =3D "Copyright (C) 2021, Red Hat, Inc." +__license__ =3D "GPL version 2 or (at your option) any later version" + +__maintainer__ =3D "Alexander Bulekov" +__email__ =3D "alxndr@bu.edu" + + +def c_header(owner): + return """/* + * Autogenerated Fuzzer Test Case + * + * Copyright (c) {date} {owner} + * + * This work is licensed under the terms of the GNU GPL, version 2 or late= r. + * See the COPYING file in the top-level directory. + */ + +#include "qemu/osdep.h" + +#include "libqos/libqtest.h" + + """.format(date=3Ddate.today().year, owner=3Downer) + +def c_comment(s): + """ Return a multi-line C comment. Assume the text is already wrapped = """ + return "/*\n * " + "\n * ".join(s.splitlines()) + "\n*/" + +def print_c_function(s): + print("/* ") + for l in s.splitlines(): + print(" * {}".format(l)) + +def bash_reproducer(path, args, trace): + result =3D '\\\n'.join(textwrap.wrap("cat << EOF | {} {}".format(path,= args), + 72, break_on_hyphens=3DFalse, + drop_whitespace=3DFalse)) + for l in trace.splitlines(): + result +=3D "\n" + '\\\n'.join(textwrap.wrap(l,72,drop_whitespace= =3DFalse)) + result +=3D "\nEOF" + return result + +def c_reproducer(name, args, trace): + result =3D [] + result.append("""static void {}(void)\n{{""".format(name)) + + # libqtest will add its own qtest args, so get rid of them + args =3D args.replace("-accel qtest","") + args =3D args.replace(",accel=3Dqtest","") + args =3D args.replace("-machine accel=3Dqtest","") + args =3D args.replace("-qtest stdio","") + result.append("""QTestState *s =3D qtest_init("{}");""".format(args)) + for l in trace.splitlines(): + param =3D l.split() + cmd =3D param[0] + if cmd =3D=3D "write": + buf =3D param[3][2:] #Get the 0x... buffer and trim the "0x" + assert len(buf)%2 =3D=3D 0 + bufbytes =3D [buf[i:i+2] for i in range(0, len(buf), 2)] + bufstring =3D '\\x'+'\\x'.join(bufbytes) + addr =3D param[1] + size =3D param[2] + result.append("""qtest_bufwrite(s, {}, "{}", {});""".format( + addr, bufstring, size)) + elif cmd.startswith("in") or cmd.startswith("read"): + result.append("qtest_{}(s, {});".format( + cmd, param[1])) + elif cmd.startswith("out") or cmd.startswith("write"): + result.append("qtest_{}(s, {}, {});".format( + cmd, param[1], param[2])) + elif cmd =3D=3D "clock_step": + if len(param) =3D=3D1: + result.append("qtest_clock_step_next(s);") + else: + result.append("qtest_clock_step(s, {});".format(param[1])) + result.append("qtest_quit(s);\n}") + return "\n".join(result) + +def c_main(name, arch): + return """int main(int argc, char **argv) +{{ + const char *arch =3D qtest_get_arch(); + + g_test_init(&argc, &argv, NULL); + + if (strcmp(arch, "{arch}") =3D=3D 0) {{ + qtest_add_func("fuzz/{name}",{name}); + }} + + return g_test_run(); +}}""".format(name=3Dname, arch=3Darch) + +def main(): + parser =3D argparse.ArgumentParser() + group =3D parser.add_mutually_exclusive_group() + group.add_argument("-bash", help=3D"Only output a copy-pastable bash c= ommand", + action=3D"store_true") + group.add_argument("-c", help=3D"Only output a c function", + action=3D"store_true") + parser.add_argument('-owner', help=3D"If generating complete C source = code, \ + this specifies the Copyright owner", + nargs=3D'?', default=3D"") + parser.add_argument("-no_comment", help=3D"Don't include a bash reprod= ucer \ + as a comment in the C reproducers", + action=3D"store_true") + parser.add_argument('-name', help=3D"The name of the c function", + nargs=3D'?', default=3D"test_fuzz") + parser.add_argument('input_trace', help=3D"input QTest command sequenc= e \ + (stdin by default)", + nargs=3D'?', type=3Dargparse.FileType('r'), + default=3Dsys.stdin) + args =3D parser.parse_args() + + qemu_path =3D os.getenv("QEMU_PATH") + qemu_args =3D os.getenv("QEMU_ARGS") + if not qemu_args or not qemu_path: + print("Please set QEMU_PATH and QEMU_ARGS environment variables") + sys.exit(1) + + bash_args =3D qemu_args + if " -qtest stdio" not in qemu_args: + bash_args +=3D " -qtest stdio" + + arch =3D qemu_path.split("-")[-1] + trace =3D args.input_trace.read().strip() + + if args.bash : + print(bash_reproducer(qemu_path, bash_args, trace)) + else: + output =3D "" + if not args.c: + output +=3D c_header(args.owner) + "\n" + if not args.no_comment: + output +=3D c_comment(bash_reproducer(qemu_path, bash_args, tr= ace)) + output +=3D c_reproducer(args.name, qemu_args, trace) + if not args.c: + output +=3D c_main(args.name, arch) + print(output) + + +if __name__ =3D=3D '__main__': + main() --=20 2.28.0