Fix partition probe for PCRE2

The pcre_exec function can return a positive number or zero,
zero is returned if the buffer isn't large enough. Therefore,
we should allow also positive number return code.

The commit also extends the test to cover the bug situation.

Fixes: #2026

Author: jan-cerny

src/OVAL/probes/unix/linux/partition_probe.c

@@ -402,7 +402,7 @@ int partition_probe_main(probe_ctx *ctx, void *probe_arg)
                                 rc = oscap_pcre_exec(re, mnt_entp->mnt_dir,
                                                strlen(mnt_entp->mnt_dir), 0, 0, NULL, 0);
 
-                                if (rc == 0) {
+                                if (rc >= 0) {
 	                                if (
 #if defined(HAVE_BLKID_GET_TAG_VALUE)
 		                                collect_item(ctx, obj_over, mnt_entp, blkcache)

tests/probes/partition/test_probes_partition.sh

@@ -10,22 +10,30 @@ function test_probes_partition {
 
     local ret_val=0;
     local DF="${srcdir}/test_probes_partition.xml"
-    local RF="test_probes_partition.results.xml"
-    echo "result file: $RF"
+    local result="test_probes_partition.results.xml"
+    echo "result file: $result"
     local stderr=$(mktemp $1.err.XXXXXX)
     echo "stderr file: $stderr"
 
-    [ -f $RF ] && rm -f $RF
+    [ -f $result ] && rm -f $result
 
-    $OSCAP oval eval --results $RF $DF 2>$stderr
+    $OSCAP oval eval --results $result $DF 2>$stderr
 
-    if [ -f $RF ]; then
-        verify_results "def" $DF $RF 1 && verify_results "tst" $DF $RF 1
+    if [ -f $result ]; then
+        verify_results "def" $DF $result 3 && verify_results "tst" $DF $result 3
         ret_val=$?
     else
         ret_val=1
     fi
 
+    CO='/oval_results/results/system/oval_system_characteristics/collected_objects'
+    assert_exists 1 $CO'/object[@id="oval:1:obj:1" and @flag="complete"]'
+    assert_exists 1 $CO'/object[@id="oval:1:obj:2" and @flag="complete"]'
+    assert_exists 1 $CO'/object[@id="oval:1:obj:3" and @flag="does not exist"]'
+    SD='/oval_results/results/system/oval_system_characteristics/system_data'
+    assert_exists 1 $SD'/lin-sys:partition_item'
+    assert_exists 1 $SD'/lin-sys:partition_item/lin-sys:mount_point[text()="/proc"]'
+
     grep -Ei "(W: |E: )" $stderr && ret_val=1 && echo "There is an error and/or a warning in the output!"
     rm $stderr
 

tests/probes/partition/test_probes_partition.xml

@@ -21,6 +21,28 @@
         </criteria>
       </criteria>
     </definition>
+    <definition class="compliance" version="1" id="oval:1:def:2"> <!-- comment="true" -->
+      <metadata>
+        <title></title>
+        <description></description>
+      </metadata>
+      <criteria>
+        <criteria operator="AND">
+          <criterion test_ref="oval:1:tst:2"/>
+        </criteria>
+      </criteria>
+    </definition>
+    <definition class="compliance" version="1" id="oval:1:def:3"> <!-- comment="true" -->
+      <metadata>
+        <title></title>
+        <description></description>
+      </metadata>
+      <criteria>
+        <criteria operator="AND">
+          <criterion test_ref="oval:1:tst:3"/>
+        </criteria>
+      </criteria>
+    </definition>
 
   </definitions>
 
@@ -29,18 +51,34 @@
       <object object_ref="oval:1:obj:1"/>
       <state state_ref="oval:1:ste:1"/>
     </partition_test>
+    <partition_test version="1" id="oval:1:tst:2" check="at least one" comment="true" xmlns="http://oval.mitre.org/XMLSchema/oval-definitions-5#linux">
+      <object object_ref="oval:1:obj:2"/>
+      <state state_ref="oval:1:ste:2"/>
+    </partition_test>
+    <partition_test version="1" id="oval:1:tst:3" check="at least one" check_existence="none_exist" comment="true" xmlns="http://oval.mitre.org/XMLSchema/oval-definitions-5#linux">
+      <object object_ref="oval:1:obj:3"/>
+    </partition_test>
   </tests>
 
   <objects>
     <partition_object version="1" id="oval:1:obj:1" xmlns="http://oval.mitre.org/XMLSchema/oval-definitions-5#linux">
       <mount_point>/proc</mount_point>
     </partition_object>
+    <partition_object version="1" id="oval:1:obj:2" xmlns="http://oval.mitre.org/XMLSchema/oval-definitions-5#linux">
+      <mount_point operation="pattern match">^\/proc$</mount_point>
+    </partition_object>
+    <partition_object version="1" id="oval:1:obj:3" xmlns="http://oval.mitre.org/XMLSchema/oval-definitions-5#linux">
+      <mount_point operation="pattern match">^something.*without.*leading.*slash$</mount_point>
+    </partition_object>
   </objects>
 
   <states>
     <partition_state version="1" id="oval:1:ste:1" xmlns="http://oval.mitre.org/XMLSchema/oval-definitions-5#linux">
       <device>proc</device>
     </partition_state>
+    <partition_state version="1" id="oval:1:ste:2" xmlns="http://oval.mitre.org/XMLSchema/oval-definitions-5#linux">
+      <device>proc</device>
+    </partition_state>
   </states>
 
-</oval_definitions>
+</oval_definitions>