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From: Alexander Bulekov <alxndr@bu.edu>
To: qemu-devel@nongnu.org
Cc: "Laurent Vivier" <lvivier@redhat.com>,
	"Thomas Huth" <thuth@redhat.com>,
	"Alexander Bulekov" <alxndr@bu.edu>,
	"Philippe Mathieu-Daudé" <f4bug@amsat.org>,
	darren.kenny@oracle.com, "Bandan Das" <bsd@redhat.com>,
	"Stefan Hajnoczi" <stefanha@redhat.com>,
	"Paolo Bonzini" <pbonzini@redhat.com>
Subject: [PATCH v5 3/3] fuzz: make object-name matching case-insensitive
Date: Tue, 29 Jun 2021 23:41:24 -0400	[thread overview]
Message-ID: <20210630034124.222689-4-alxndr@bu.edu> (raw)
In-Reply-To: <20210630034124.222689-1-alxndr@bu.edu>

We have some configs for devices such as the AC97 and ES1370 that were
not matching memory-regions correctly, because the configs provided
lowercase names. To resolve these problems and prevent them from
occurring again in the future, convert both the pattern and names to
lower-case, prior to checking for a match.

Suggested-by: Darren Kenny <darren.kenny@oracle.com>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
---
 tests/qtest/fuzz/generic_fuzz.c | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/tests/qtest/fuzz/generic_fuzz.c b/tests/qtest/fuzz/generic_fuzz.c
index 43f9011626..59be7219de 100644
--- a/tests/qtest/fuzz/generic_fuzz.c
+++ b/tests/qtest/fuzz/generic_fuzz.c
@@ -751,8 +751,13 @@ static int locate_fuzz_memory_regions(Object *child, void *opaque)
 
 static int locate_fuzz_objects(Object *child, void *opaque)
 {
+    GString *type_name;
+    GString *path_name;
     char *pattern = opaque;
-    if (g_pattern_match_simple(pattern, object_get_typename(child))) {
+
+    type_name = g_string_new(object_get_typename(child));
+    g_string_ascii_down(type_name);
+    if (g_pattern_match_simple(pattern, type_name->str)) {
         /* Find and save ptrs to any child MemoryRegions */
         object_child_foreach_recursive(child, locate_fuzz_memory_regions, NULL);
 
@@ -769,8 +774,9 @@ static int locate_fuzz_objects(Object *child, void *opaque)
             g_ptr_array_add(fuzzable_pci_devices, PCI_DEVICE(child));
         }
     } else if (object_dynamic_cast(OBJECT(child), TYPE_MEMORY_REGION)) {
-        if (g_pattern_match_simple(pattern,
-            object_get_canonical_path_component(child))) {
+        path_name = g_string_new(object_get_canonical_path_component(child));
+        g_string_ascii_down(path_name);
+        if (g_pattern_match_simple(pattern, path_name->str)) {
             MemoryRegion *mr;
             mr = MEMORY_REGION(child);
             if ((memory_region_is_ram(mr) ||
@@ -779,7 +785,9 @@ static int locate_fuzz_objects(Object *child, void *opaque)
                 g_hash_table_insert(fuzzable_memoryregions, mr, (gpointer)true);
             }
         }
+        g_string_free(path_name, true);
     }
+    g_string_free(type_name, true);
     return 0;
 }
 
@@ -807,6 +815,7 @@ static void generic_pre_fuzz(QTestState *s)
     MemoryRegion *mr;
     QPCIBus *pcibus;
     char **result;
+    GString *name_pattern;
 
     if (!getenv("QEMU_FUZZ_OBJECTS")) {
         usage();
@@ -836,10 +845,17 @@ static void generic_pre_fuzz(QTestState *s)
 
     result = g_strsplit(getenv("QEMU_FUZZ_OBJECTS"), " ", -1);
     for (int i = 0; result[i] != NULL; i++) {
+        name_pattern = g_string_new(result[i]);
+        /*
+         * Make the pattern lowercase. We do the same for all the MemoryRegion
+         * and Type names so the configs are case-insensitive.
+         */
+        g_string_ascii_down(name_pattern);
         printf("Matching objects by name %s\n", result[i]);
         object_child_foreach_recursive(qdev_get_machine(),
                                     locate_fuzz_objects,
-                                    result[i]);
+                                    name_pattern->str);
+        g_string_free(name_pattern, true);
     }
     g_strfreev(result);
     printf("This process will try to fuzz the following MemoryRegions:\n");
-- 
2.28.0



      parent reply	other threads:[~2021-06-30  3:44 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-30  3:41 [PATCH v5 0/3] Fuzzer pattern-matching, timeouts, and instrumentation-filtering Alexander Bulekov
2021-06-30  3:41 ` [PATCH v5 1/3] fuzz: adjust timeout to allow for longer inputs Alexander Bulekov
2021-06-30  3:41 ` [PATCH v5 2/3] fuzz: add an instrumentation filter Alexander Bulekov
2021-07-08  2:58   ` Alexander Bulekov
2021-07-08  9:30   ` Darren Kenny
2021-06-30  3:41 ` Alexander Bulekov [this message]

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