[2/2] fuzz: Add support for logging QTest commands

Commit Message

Alexander Bulekov May 29, 2020, 4:57 p.m. UTC

Signed-off-by: Alexander Bulekov <[e-mail]>
---
 tests/qtest/fuzz/fuzz.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

Patch

diff --git a/tests/qtest/fuzz/fuzz.c b/tests/qtest/fuzz/fuzz.c
index ea630ddb9b..2c9e2ee7b7 100644
--- a/tests/qtest/fuzz/fuzz.c
+++ b/tests/qtest/fuzz/fuzz.c
@@ -94,7 +94,9 @@  static void usage(char *path)
     printf("Alternatively, add -target-FUZZ_TARGET to the executable name\n\n"
            "Set the environment variable FUZZ_SERIALIZE_QTEST=1 to serialize\n"
            "QTest commands into an ASCII protocol. Useful for building crash\n"
-           "reproducers, but slows down execution.\n");
+           "reproducers, but slows down execution.\n\n"
+           "Set the environment variable QTEST_LOG=1 to log all qtest commands"
+           "\n");
     exit(0);
 }
 
@@ -198,6 +200,11 @@  int LLVMFuzzerInitialize(int *argc, char ***argv, char ***envp)
     /* Run QEMU's softmmu main with the fuzz-target dependent arguments */
     const char *init_cmdline = fuzz_target->get_init_cmdline(fuzz_target);
 
+    init_cmdline = g_strdup_printf("%s -qtest /dev/null -qtest-log %s",
+                                   init_cmdline,
+                                   getenv("QTEST_LOG") ? "/dev/fd/2"
+                                                       : "/dev/null");
+
     /* Split the runcmd into an argv and argc */
     wordexp_t result;
     wordexp(init_cmdline, &result, 0);