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fuzz: enable dynamic args for generic-fuzz configs

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For some device configurations, it is useful to configure some
resources, and adjust QEMU arguments at runtime, prior to fuzzing. This
patch adds an "argfunc" to generic the generic_fuzz_config. When
specified, it is responsible for configuring the resources and returning
a string containing the corresponding QEMU arguments. This can be useful
for targets that rely on e.g.:
 * a temporary qcow2 image
 * a temporary directory
 * an unused TCP port used to bind the VNC server

Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20210117230924.449676-2-alxndr@bu.edu>
This commit is contained in:
Alexander Bulekov 2021-01-17 18:09:22 -05:00 committed by Paolo Bonzini
parent 61f90e0461
commit 8630b43f11
2 changed files with 10 additions and 1 deletions
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10
tests/qtest/fuzz/generic_fuzz.c
View File

@ -933,12 +933,20 @@ static GString *generic_fuzz_cmdline(FuzzTarget *t)
static GString *generic_fuzz_predefined_config_cmdline(FuzzTarget *t)
{
gchar *args;
const generic_fuzz_config *config;
g_assert(t->opaque);
config = t->opaque;
setenv("QEMU_AVOID_DOUBLE_FETCH", "1", 1);
setenv("QEMU_FUZZ_ARGS", config->args, 1);
if (config->argfunc) {
args = config->argfunc();
setenv("QEMU_FUZZ_ARGS", args, 1);
g_free(args);
} else {
g_assert_nonnull(config->args);
setenv("QEMU_FUZZ_ARGS", config->args, 1);
}
setenv("QEMU_FUZZ_OBJECTS", config->objects, 1);
return generic_fuzz_cmdline(t);
}

1
tests/qtest/fuzz/generic_fuzz_configs.h
View File

@ -16,6 +16,7 @@
typedef struct generic_fuzz_config {
const char *name, *args, *objects;
gchar* (*argfunc)(void); /* Result must be freeable by g_free() */
} generic_fuzz_config;
const generic_fuzz_config predefined_configs[] = {