[clamav-users] ScanOnAccess: ... (null) FOUND

Thu Aug 2 12:45:40 UTC 2018

> How long as this been going on?

Apparently it has been going on for a couple of days. I did not notice the "ScanOnAccess: ... (null) FOUND" messages, until I hid the "ScanOnAccess: Performing additional scanning on file ..." messages. The first occurrence was on July 23rd 13:00:08 with clamav-0.99.4-1.el7.x86_64

Jul 23 13:00:08 hostname1 clamd[6539]: ScanOnAccess: /home/user1/.nv/GLCache/ca7c949c26f976e0f53c14399c2ef02e/3a4ed7c703a940c9: (null) FOUND
Jul 23 13:00:08 hostname1 clamd[6539]: ScanOnAccess: /home/user1/.nv/GLCache/ca7c949c26f976e0f53c14399c2ef02e: (null) FOUND

As you can see, those messages do not only appear for the firefox cache.

On Jul 26th we updated clamav to clamav-0.100.1-1.el7.x86_64. But the messages still appear.

> What is your database set?

Database information
--------------------
Database directory: /var/lib/clamav
main.cvd: version 58, sigs: 4566249, built on Wed Jun  7 23:38:10 2017
bytecode.cld: version 326, sigs: 93, built on Thu Jul 26 18:44:35 2018
daily.cld: version 24803, sigs: 2034540, built on Wed Aug  1 18:43:39 2018
Total number of signatures: 6600882

> What version of ClamAV are you using?
Currently clamav-0.100.1-1.el7.x86_64

> Are you using the VirusEvent hook?
No

I noticed something else. There were out of memory messages showing for clamd.

Aug 02 13:07:17 cis4test clamd[4051]: out of memory [4051]
Aug 02 13:17:17 cis4test clamd[4051]: out of memory [4051]

Unfortunately they were not associated with clamd but with journal in rsyslog, that's why I did not notice them at first. At that time the machine had 3GB of free memory and more than 25GB of free swap, so I don't understand why those messages were showing up. They also started to show up on Jul 24th 14:38:08 (after the first "ScanOnAccess: ... (null) FOUND" messages showed up). On July 26th the messages stopped after updating clamav to 0.100.1-1, but then showed up again on Aug 1st 18:56:31. I just restarted clamav and the "out of memory" messages are no longer showing up and the "ScanOnAccess: ... (null) FOUND" are not either.

Summary:
Jul 23 13:00:08 -- first "ScanOnAccess: ... (null) FOUND" message
Jul 24 14:38:08 -- first "out of memory" message
Jul 26 14:44:03 -- update to clamav-0.100.1-1, "ScanOnAccess: ... (null) FOUND" messages and "out of memory" messages stop
Jul 30 09:40:44 -- "ScanOnAccess: ... (null) FOUND" messages reappear
Aug  1 18:56:31 -- "out of memory" messages reappear
Aug  2 13:38:51 -- restart clamd at scan, "ScanOnAccess: ... (null) FOUND" messages and "out of memory" messages stop

I will closely monitor the faulty machine and I will try to reproduce this behavior on a different machine and report back to you with my findings.

I attached the output of clamconf.

Best regards,
Jens

-------------- next part --------------
Checking configuration files in /etc

Config file: clamd.conf
-----------------------
BlockMax disabled
PreludeEnable disabled
PreludeAnalyzerName disabled
LogFile disabled
LogFileUnlock disabled
LogFileMaxSize = "1048576"
LogTime disabled
LogClean disabled
LogSyslog = "yes"
LogFacility = "LOG_LOCAL6"
LogVerbose disabled
LogRotate disabled
ExtendedDetectionInfo disabled
PidFile disabled
TemporaryDirectory disabled
DatabaseDirectory = "/var/lib/clamav"
OfficialDatabaseOnly disabled
LocalSocket = "/var/run/clamd.scan/clamd.sock"
LocalSocketGroup disabled
LocalSocketMode disabled
FixStaleSocket = "yes"
TCPSocket disabled
TCPAddr disabled
MaxConnectionQueueLength = "200"
StreamMaxLength = "26214400"
StreamMinPort = "1024"
StreamMaxPort = "2048"
MaxThreads = "10"
ReadTimeout = "120"
CommandReadTimeout = "5"
SendBufTimeout = "500"
MaxQueue = "100"
IdleTimeout = "30"
ExcludePath disabled
MaxDirectoryRecursion = "15"
FollowDirectorySymlinks disabled
FollowFileSymlinks disabled
CrossFilesystems = "yes"
SelfCheck = "600"
DisableCache disabled
VirusEvent disabled
ExitOnOOM disabled
AllowAllMatchScan = "yes"
Foreground disabled
Debug disabled
LeaveTemporaryFiles disabled
User = "root"
Bytecode = "yes"
BytecodeSecurity = "TrustSigned"
BytecodeTimeout = "5000"
BytecodeUnsigned disabled
BytecodeMode = "Auto"
DetectPUA disabled
ExcludePUA disabled
IncludePUA disabled
AlgorithmicDetection = "yes"
ScanPE = "yes"
ScanELF = "yes"
DetectBrokenExecutables disabled
ScanMail = "yes"
ScanPartialMessages disabled
PhishingSignatures = "yes"
PhishingScanURLs = "yes"
PhishingAlwaysBlockCloak disabled
PhishingAlwaysBlockSSLMismatch disabled
PartitionIntersection disabled
HeuristicScanPrecedence disabled
StructuredDataDetection disabled
StructuredMinCreditCardCount = "3"
StructuredMinSSNCount = "3"
StructuredSSNFormatNormal = "yes"
StructuredSSNFormatStripped disabled
ScanHTML = "yes"
ScanOLE2 = "yes"
OLE2BlockMacros disabled
ScanPDF = "yes"
ScanSWF = "yes"
ScanXMLDOCS = "yes"
ScanHWP3 = "yes"
ScanArchive = "yes"
ArchiveBlockEncrypted disabled
ForceToDisk disabled
MaxScanSize = "104857600"
MaxFileSize = "26214400"
MaxRecursion = "16"
MaxFiles = "10000"
MaxEmbeddedPE = "10485760"
MaxHTMLNormalize = "10485760"
MaxHTMLNoTags = "2097152"
MaxScriptNormalize = "5242880"
MaxZipTypeRcg = "1048576"
MaxPartitions = "50"
MaxIconsPE = "100"
MaxRecHWP3 = "16"
PCREMatchLimit = "100000"
PCRERecMatchLimit = "5000"
PCREMaxFileSize = "26214400"
ScanOnAccess = "yes"
OnAccessMountPath disabled
OnAccessIncludePath = "/home/user1", "/home/user2", "/media"
OnAccessExcludePath disabled
OnAccessExcludeRootUID disabled
OnAccessExcludeUID disabled
OnAccessMaxFileSize = "5242880"
OnAccessDisableDDD disabled
OnAccessPrevention disabled
OnAccessExtraScanning = "yes"
DevACOnly disabled
DevACDepth disabled
DevPerformance disabled
DevLiblog disabled
DisableCertCheck disabled

Config file: freshclam.conf
---------------------------
LogFileMaxSize = "1048576"
LogTime disabled
LogSyslog = "yes"
LogFacility = "LOG_LOCAL6"
LogVerbose disabled
LogRotate disabled
PidFile disabled
DatabaseDirectory = "/var/lib/clamav"
Foreground disabled
Debug disabled
UpdateLogFile disabled
DatabaseOwner = "clamupdate"
Checks = "12"
DNSDatabaseInfo = "current.cvd.clamav.net"
DatabaseMirror disabled
PrivateMirror = "privatemirror1", "privatemirro2"
MaxAttempts = "3"
ScriptedUpdates disabled
TestDatabases = "yes"
CompressLocalDatabase disabled
ExtraDatabase disabled
DatabaseCustomURL disabled
HTTPProxyServer disabled
HTTPProxyPort disabled
HTTPProxyUsername disabled
HTTPProxyPassword disabled
HTTPUserAgent disabled
NotifyClamd = "/etc/clamd.conf"
OnUpdateExecute disabled
OnErrorExecute disabled
OnOutdatedExecute disabled
LocalIPAddress disabled
ConnectTimeout = "30"
ReceiveTimeout = "30"
SafeBrowsing disabled
Bytecode = "yes"

clamav-milter.conf not found

Software settings
-----------------
Version: 0.100.1
Optional features supported: MEMPOOL IPv6 AUTOIT_EA06 BZIP2 LIBXML2 PCRE2 ICONV JSON 

Database information
--------------------
Database directory: /var/lib/clamav
main.cvd: version 58, sigs: 4566249, built on Wed Jun  7 23:38:10 2017
bytecode.cld: version 326, sigs: 93, built on Thu Jul 26 18:44:35 2018
daily.cld: version 24803, sigs: 2034540, built on Wed Aug  1 18:43:39 2018
Total number of signatures: 6600882

Platform information
--------------------
uname: Linux 3.10.0-862.9.1.el7.x86_64 #1 SMP Wed Jun 27 04:30:39 EDT 2018 x86_64
OS: linux-gnu, ARCH: x86_64, CPU: x86_64
zlib version: 1.2.7 (1.2.7), compile flags: a9
platform id: 0x0a215c5c0800000002040805

Build information
-----------------
GNU C: 4.8.5 20150623 (Red Hat 4.8.5-28) (4.8.5)
CPPFLAGS: 
CFLAGS: -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1  -m64 -mtune=generic -fno-strict-aliasing   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
CXXFLAGS: -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1  -m64 -mtune=generic
LDFLAGS: -Wl,-z,relro -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -Wl,--as-needed
Configure: '--build=x86_64-redhat-linux-gnu' '--host=x86_64-redhat-linux-gnu' '--program-prefix=' '--disable-dependency-tracking' '--prefix=/usr' '--exec-prefix=/usr' '--bindir=/usr/bin' '--sbindir=/usr/sbin' '--sysconfdir=/etc' '--datadir=/usr/share' '--includedir=/usr/include' '--libdir=/usr/lib64' '--libexecdir=/usr/libexec' '--localstatedir=/var' '--sharedstatedir=/var/lib' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--enable-milter' '--disable-clamav' '--disable-static' '--disable-zlib-vcheck' '--disable-unrar' '--enable-id-check' '--enable-dns' '--with-dbdir=/var/lib/clamav' '--with-group=clamupdate' '--with-libcurl=/usr' '--with-user=clamupdate' '--disable-rpath' '--disable-silent-rules' '--enable-clamdtop' 'build_alias=x86_64-redhat-linux-gnu' 'host_alias=x86_64-redhat-linux-gnu' 'CFLAGS=-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1  -m64 -mtune=generic' 'LDFLAGS=-Wl,-z,relro -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -Wl,--as-needed' 'PKG_CONFIG_PATH=:/usr/lib64/pkgconfig:/usr/share/pkgconfig'
sizeof(void*) = 8
Engine flevel: 92, dconf: 92