SELinux and google-chrome "Aw, Snap!" crashes

Daniel J Walsh dwalsh at redhat.com
Thu Sep 16 15:49:55 UTC 2010


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On 09/16/2010 07:47 AM, Daniel J Walsh wrote:
> On 09/16/2010 06:04 AM, John Austin wrote:
>> On Wed, 2010-09-15 at 13:10 +0000, JB wrote:
>>> John Austin <ja <at> jaa.org.uk> writes:
>>>
>>>>
>>>> Hi
>>>>
>>>> I have a fully updated F13 (64bit) machines using
>>>> google-chrome 6.0.472.55 beta
>>>>
>>>> With SELinux in Enforcing mode
>>>>
>>>> google-chrome will crash leaving no error messages in dmesg
>>>> or /var/log/messages or in the terminal if run from the command line
>>>> (to be exact - only the startup messages shown below)
>>>> No Selinux problems are shown by SElinux Troubleshooter
>>>>
>>>> Just the "Aw, Snap!" page is shown
>>>> "Something went wrong while displaying this webpage"
>>>> No keys, mouse buttons do anything useful within the display area.
>>>> Selecting "Learn more" repaints the "Aw, Snap!" page.
>>>> The outer window is active ie bookmarks, options can be accessed
>>>> but the "display area" will not reload anything other than "Aw, Snap!"
>>>> The top right "kill window X" does indeed kill the window
>>>>
>>>> The site I have been using for testing is
>>>> http://www.justtheflight.co.uk/
>>>>
>>>> Type in "gat" into the "Departing from" and selecting
>>>> London Gatwick
>>>> causes the crash
>>>>
>>>> Switching SElinux to permissive mode DOES NOT crash the above site!
>>>> but SElinux Troubleshooter shows no problems.
>>>>
>>>> As far as I remember the only things I have changed in SElinux
>>>> were a couple of settings that were to do with my home
>>>> directories being on NFS mounts.
>>>>
>>>> I have fiddled with almost all of the google-chrome option settings etc
>>>> Also searched the web.  Found many references to "Aw, Snap!" but
>>>> could not see anything that might help.
>>>>
>>>> Has anyone else seen this problem?
>>>> Advice as to how to debug further very welcome
>>>>
>>>> John
>>>>
>>>> Running in a terminal gives
>>>> milos ~ 1# google-chrome 
>>>> /usr/bin/google-chrome: /lib64/libz.so.1: no version information available
>>> (required by /usr/bin/google-chrome)
>>>> /usr/bin/google-chrome: /lib64/libz.so.1: no version information available
>>> (required by /usr/bin/google-chrome)
>>>> /opt/google/chrome/chrome: /lib64/libz.so.1: no version information available
>>> (required by /opt/google/chrome/chrome)
>>>> /opt/google/chrome/chrome: /lib64/libz.so.1: no version information available
>>> (required by /opt/google/chrome/chrome)
>>>>
>>>
> 
> 
>> Many thanks for the reply
>> I have intermixed my feedback below
> 
>>> Hi,
>>> some remarks and hints.
>>>
>>> Make sure that you have the latest package (sometimes it gets updated every
>>> day):
>>> # yum list installed *chrome*
>>> # yum update *chrome*
>> Yes I updated to google-chrome-beta-6.0.472.59-59126.x86_64 yesterday -
>> no change
> 
>>>
>>> I noticed that you ran the browser from root prompt (#) - a Big NO-NO !
>> This was just an obsolete .bashrc/.bash_profile
>> The browser was not being run as root!
> 
>>>
>>> The "Aw, Snap!" problem has been reported since 2008 on all platforms (Win,
>>> Mac, Linux) under all circumstances. It seems to be a general error.
>>> So it is not related directly to SELinux, but it may be on your machine, in
>>> particular if your home dir is on NFS (timeouts, locks, and similar issues).
>> I am using NIS + autofs + NFS4 for home directories
>> Abstract from my F13_install "log"
>> If SElinux is enabled then it is necessary to use SELinux Management to
>> set
>> Boolean ssh allow host key authentication
>> if direct ssh from another machine is required.
>> Also
>> setsebool -P use_nfs_home_dirs
> 
>> I have tried adding a new local user on a client machine and the problem is not there
>> Not a definitive test as the new user will have different defaults.
> 
>> I have tried adding a new user to the server (Centos5.5) and logged into
>> the client - "justtheflight" crashes.
> 
>> This suggests that it is the NFS mount that is causing the problem
>> I have no idea why this should be!
> 
>> The new users should have "default" settings for the options below
>> I have not tested all these yet
> 
>> The sandbox does crash but the nosandbox does NOT - see below
>>>
>>> Some hints regarding browser config:
>>> - take a look at your config and change to default options for the time being
>>>   Tools button
>>>   Options
>>>   Under the Hood:
>>>   Content settings:
>>>     JavaScript                     <--- allow all sites, no exceptions
>>>     Plug-ins                       <--- allow all sites, no exceptions
>>>                                         try all ON and all OFF
>>>   Use DNS prefetching ...          <--- test with ON and OFF
>>>   Enable phishing and malware ...  <--- test with ON and OFF
>>>   Change proxy settings:
>>>     Direct internet connection     <--- yes, if you can
>>>   Translate ...                    <--- turn it OFF                
>>> - extensions
>>>   Tools button - Tools - Extensions
>>>   If you have any, try to disable them all,later one by one, then restart
>>>   the browser and see what happens.
>>>
>>> Debugging:
>>> http://code.google.com/p/chromium/wiki/LinuxDebugging
>>> >From a terminal (gnome terminal, xterm, etc):
>>> $ CHROME_IPC_LOGGING=1 google-chrome --log-level=0 --enable-logging=stderr >&
>>> .chrom.log http://www.justtheflight.co.uk/
>>> This will generate a log file .chrom.log in your home dir. If not empty, attach
>>> it to your problem report.
>> This from the new user whose home directory is NFS mounted (The site crashed)
>> [tester at milos ~]$ CHROME_IPC_LOGGING=1 google-chrome --log-level=0 --enable-logging=stderr >& .chrom.log http://www.justtheflight.co.uk/
>> [tester at milos ~]$ cat .chrom.log 
>> /usr/bin/google-chrome: /lib64/libz.so.1: no version information available (required by /usr/bin/google-chrome)
>> /usr/bin/google-chrome: /lib64/libz.so.1: no version information available (required by /usr/bin/google-chrome)
>> [22545:22562:145918300330:INFO:net/base/host_resolver_impl.cc(1083)] IPv6Probe forced AddressFamily setting to ADDRESS_FAMILY_IPV4
>> [22545:22545:145918310946:INFO:chrome/browser/extensions/extensions_service.cc(630)] Sending EXTENSION_LOADED
>> [22545:22545:145918332021:INFO:chrome/browser/sync/profile_sync_service.cc(97)] Detected official build, using official sync server.
>> [22545:22545:145918332059:INFO:chrome/browser/sync/profile_sync_service.cc(129)] Starting ProfileSyncService.                                                   
>> [22545:22545:145918332065:INFO:chrome/browser/sync/profile_sync_service.cc(198)] Using https://clients4.google.com/chrome-sync for sync server URL.             
>> [22545:22545:145918332103:INFO:chrome/browser/sync/profile_sync_service.cc(357)] Clearing Sync DB.                                                              
>> [22545:22562:145918429713:INFO:net/proxy/proxy_service.cc(644)] Failed initial proxy configuration fetch.                                                       
>> [22545:22562:145919777048:INFO:chrome/browser/renderer_host/buffered_resource_handler.cc(208)] To buffer: http://www.justtheflight.co.uk/                       
>> [22545:22562:145919777591:INFO:chrome/browser/renderer_host/buffered_resource_handler.cc(140)] Finished buffering http://www.justtheflight.co.uk/               
>> [22545:22545:145919817088:INFO:chrome/browser/history/history.cc(747)] History backend finished loading
>> [22545:22562:145920140936:INFO:chrome/browser/renderer_host/buffered_resource_handler.cc(178)] To buffer: http://www.justtheflight.co.uk/xmlfeeds/jtfairports.xml
>> [22545:22562:145920144427:INFO:chrome/browser/renderer_host/buffered_resource_handler.cc(140)] Finished buffering http://www.justtheflight.co.uk/xmlfeeds/jtfairports.xml
>> [22545:22556:145928316471:INFO:chrome/common/important_file_writer.cc(71)] successfully saved /home/tester/.config/google-chrome/Default/Preferences
>> [22545:22556:145930787476:INFO:chrome/common/important_file_writer.cc(71)] successfully saved /home/tester/.config/google-chrome/Local State
>> [22545:22556:145930794207:INFO:chrome/common/important_file_writer.cc(71)] successfully saved /home/tester/.config/google-chrome/Default/Preferences
> 
>>>
>>> You can run the browser without sandboxing (their idea about processes
>>> separation and security); but because of that do it only for testing, not to
>>> access important to you web sites:
>>> $ google-chrome --no-sandbox http://www.justtheflight.co.uk/
> 
>> [tester at milos ~]$ google-chrome --no-sandbox http://www.justtheflight.co.uk/
>> In this case the site did NOT crash
> 
>>> You may run the browser in debugging session with it as well: 
>>> $ CHROME_IPC_LOGGING=1 google-chrome --no-sandbox --log-level=0
>>> --enable-logging=stderr >& .chrom.log http://www.justtheflight.co.uk/
> 
>> [tester at milos ~]$ CHROME_IPC_LOGGING=1 google-chrome --no-sandbox --log-level=0 --enable-logging=stderr >& .chrom.log http://www.justtheflight.co.uk/
>> [tester at milos ~]$ cat .chrom.log 
>> /usr/bin/google-chrome: /lib64/libz.so.1: no version information available (required by /usr/bin/google-chrome)
>> /usr/bin/google-chrome: /lib64/libz.so.1: no version information available (required by /usr/bin/google-chrome)
>> /opt/google/chrome/chrome: /lib64/libz.so.1: no version information available (required by /opt/google/chrome/chrome)
>> /opt/google/chrome/chrome: /lib64/libz.so.1: no version information available (required by /opt/google/chrome/chrome)
>> [22719:22732:146271772673:INFO:net/base/host_resolver_impl.cc(1083)] IPv6Probe forced AddressFamily setting to ADDRESS_FAMILY_IPV4
>> [22719:22719:146271780682:INFO:chrome/browser/extensions/extensions_service.cc(630)] Sending EXTENSION_LOADED
>> [22719:22719:146271796677:INFO:chrome/browser/sync/profile_sync_service.cc(97)] Detected official build, using official sync server.
>> [22719:22719:146271796708:INFO:chrome/browser/sync/profile_sync_service.cc(129)] Starting ProfileSyncService.
>> [22719:22719:146271796714:INFO:chrome/browser/sync/profile_sync_service.cc(198)] Using https://clients4.google.com/chrome-sync for sync server URL.
>> [22719:22719:146271796757:INFO:chrome/browser/sync/profile_sync_service.cc(357)] Clearing Sync DB.
>> [22719:22732:146271889163:INFO:net/proxy/proxy_service.cc(644)] Failed initial proxy configuration fetch.
>> [22719:22732:146273237280:INFO:chrome/browser/renderer_host/buffered_resource_handler.cc(208)] To buffer: http://www.justtheflight.co.uk/
>> [22719:22732:146273237768:INFO:chrome/browser/renderer_host/buffered_resource_handler.cc(140)] Finished buffering http://www.justtheflight.co.uk/
>> [22749:22749:146273240536:INFO:chrome/renderer/user_script_slave.cc(283)] Injected 0 scripts and 0 css files into http://www.justtheflight.co.uk/
>> [22719:22719:146273267428:INFO:chrome/browser/history/history.cc(747)] History backend finished loading
>> [22719:22732:146273558643:INFO:chrome/browser/renderer_host/buffered_resource_handler.cc(178)] To buffer: http://www.justtheflight.co.uk/xmlfeeds/jtfairports.xml
>> [22719:22732:146273559448:INFO:chrome/browser/renderer_host/buffered_resource_handler.cc(140)] Finished buffering http://www.justtheflight.co.uk/xmlfeeds/jtfairports.xml
>> [22749:22749:146273560901:INFO:chrome/renderer/user_script_slave.cc(283)] Injected 0 scripts and 0 css files into http://www.justtheflight.co.uk/
>> [22749:22749:146273711200:INFO:chrome/renderer/user_script_slave.cc(283)] Injected 0 scripts and 0 css files into http://www.justtheflight.co.uk/
>> [22719:22726:146281786532:INFO:chrome/common/important_file_writer.cc(71)] successfully saved /home/tester/.config/google-chrome/Default/Preferences
>> [22749:22749:146284263918:INFO:chrome/renderer/render_view.cc(4901)] PLT: 1841ms http://www.justtheflight.co.uk/
>> [22719:22726:146284296387:INFO:chrome/common/important_file_writer.cc(71)] successfully saved /home/tester/.config/google-chrome/Local State
>> [22719:22726:146284301758:INFO:chrome/common/important_file_writer.cc(71)] successfully saved /home/tester/.config/google-chrome/Default/Preferences
> 
>>>
>>> File a problem report:
>>> http://code.google.com/p/chromium/issues/list
>>> New issue
>>>
>>> JB
> 
>> Do you think I have reached the stage when I should submit a bug report?
> 
>> Thanks again
> 
>> John
> 
> 
> 
> Can you put the chrome-sandbox into permissive mode and see what AVC's
> it generated.
> 
> # semanage permissive -a chrome_sandbox_t
> 
> Then run chrome
>> chrome
> 
> # ausearch -m avc -ts recent
> # semanage permissive -d chrome_sandbox_t
> to pu chrome_sandbox back into enforcing mode.


Ok for some reason it wants to search through the NFS home dir.

# grep chrome /var/log/audit/audit/audit.log | audit2allow -M mychrome
# semodule -i mycrhome.pp

And see if this is enough to run chrome on an nfs homedir.
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