Antonio Olivares wrote: > Dear fellow testers and selinux experts, > > I have encountered several avcs. I want to ask you for advice before applying the suggested fixes. > > > Summary: > > SELinux is preventing knotify4 from making the program stack executable. > > Detailed Description: > > The knotify4 application attempted to make its stack executable. This is a > potential security problem. This should never ever be necessary. Stack memory is > not executable on most OSes these days and this will not change. Executable > stack memory is one of the biggest security problems. An execstack error might > in fact be most likely raised by malicious code. Applications are sometimes > coded incorrectly and request this permission. The SELinux Memory Protection > Tests (http://people.redhat.com/drepper/selinux-mem.html) web page explains how > to remove this requirement. If knotify4 does not work and you need it to work, > you can configure SELinux temporarily to allow this access until the application > is fixed. Please file a bug report > (http://bugzilla.redhat.com/bugzilla/enter_bug.cgi) against this package. > > Allowing Access: > > Sometimes a library is accidentally marked with the execstack flag, if you find > a library with this flag you can clear it with the execstack -c LIBRARY_PATH. > Then retry your application. If the app continues to not work, you can turn the > flag back on with execstack -s LIBRARY_PATH. Otherwise, if you trust knotify4 to > run correctly, you can change the context of the executable to > unconfined_execmem_exec_t. "chcon -t unconfined_execmem_exec_t > '/usr/bin/knotify4'" You must also change the default file context files on the > system in order to preserve them even on a full relabel. "semanage fcontext -a > -t unconfined_execmem_exec_t '/usr/bin/knotify4'" > > Fix Command: > > chcon -t unconfined_execmem_exec_t '/usr/bin/knotify4' > > Additional Information: > > Source Context unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1 > 023 > Target Context unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1 > 023 > Target Objects None [ process ] > Source knotify4 > Source Path /usr/bin/knotify4 > Port <Unknown> > Host riohigh > Source RPM Packages kdebase-runtime-4.1.2-3.fc10 > Target RPM Packages > Policy RPM selinux-policy-3.5.10-3.fc10 > Selinux Enabled True > Policy Type targeted > MLS Enabled True > Enforcing Mode Enforcing > Plugin Name allow_execstack > Host Name riohigh > Platform Linux riohigh 2.6.27-3.fc10.i686 #1 SMP Fri Oct 10 > 01:26:26 EDT 2008 i686 athlon > Alert Count 2 > First Seen Thu 16 Oct 2008 06:33:56 AM CDT > Last Seen Thu 16 Oct 2008 06:33:56 AM CDT > Local ID d2171be2-9d07-43e0-83bf-95f7f3e5e666 > Line Numbers > > Raw Audit Messages > > node=riohigh type=AVC msg=audit(1224156836.173:93): avc: denied { execstack } for pid=2874 comm="knotify4" scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=process > > node=riohigh type=SYSCALL msg=audit(1224156836.173:93): arch=40000003 syscall=125 success=no exit=-13 a0=bf9c9000 a1=1000 a2=1000007 a3=fffff000 items=0 ppid=1 pid=2874 auid=501 uid=501 gid=501 euid=501 suid=501 fsuid=501 egid=501 sgid=501 fsgid=501 tty=(none) ses=1 comm="knotify4" exe="/usr/bin/knotify4" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null) > > > > > Summary: > > SELinux is preventing hal-acl-tool (hald_acl_t) "sys_resource" hald_acl_t. > > Detailed Description: > > SELinux denied access requested by hal-acl-tool. It is not expected that this > access is required by hal-acl-tool and this access may signal an intrusion > attempt. It is also possible that the specific version or configuration of the > application is causing it to require additional access. > > Allowing Access: > > You can generate a local policy module to allow this access - see FAQ > (http://fedora.redhat.com/docs/selinux-faq-fc5/#id2961385) Or you can disable > SELinux protection altogether. Disabling SELinux protection is not recommended. > Please file a bug report (http://bugzilla.redhat.com/bugzilla/enter_bug.cgi) > against this package. > > Additional Information: > > Source Context system_u:system_r:hald_acl_t:s0 > Target Context system_u:system_r:hald_acl_t:s0 > Target Objects None [ capability ] > Source hal-acl-tool > Source Path /usr/libexec/hal-acl-tool > Port <Unknown> > Host riohigh > Source RPM Packages hal-0.5.12-3.20081013git.fc10 > Target RPM Packages > Policy RPM selinux-policy-3.5.10-3.fc10 > Selinux Enabled True > Policy Type targeted > MLS Enabled True > Enforcing Mode Enforcing > Plugin Name catchall > Host Name riohigh > Platform Linux riohigh 2.6.27-3.fc10.i686 #1 SMP Fri Oct 10 > 01:26:26 EDT 2008 i686 athlon > Alert Count 73 > First Seen Sat 04 Oct 2008 11:10:27 AM CDT > Last Seen Thu 16 Oct 2008 06:33:03 AM CDT > Local ID 16181f84-ddf2-4510-bd51-aef5ff647a63 > Line Numbers > > Raw Audit Messages > > node=riohigh type=AVC msg=audit(1224156783.891:89): avc: denied { sys_resource } for pid=2568 comm="hal-acl-tool" capability=24 scontext=system_u:system_r:hald_acl_t:s0 tcontext=system_u:system_r:hald_acl_t:s0 tclass=capability > > node=riohigh type=SYSCALL msg=audit(1224156783.891:89): arch=40000003 syscall=4 success=yes exit=2057 a0=5 a1=b7ff4000 a2=809 a3=809 items=0 ppid=1834 pid=2568 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="hal-acl-tool" exe="/usr/libexec/hal-acl-tool" subj=system_u:system_r:hald_acl_t:s0 key=(null) > > > > Summary: > > SELinux is preventing console-kit-dae (consolekit_t) "sys_resource" > consolekit_t. > > Detailed Description: > > SELinux denied access requested by console-kit-dae. It is not expected that this > access is required by console-kit-dae and this access may signal an intrusion > attempt. It is also possible that the specific version or configuration of the > application is causing it to require additional access. > > Allowing Access: > > You can generate a local policy module to allow this access - see FAQ > (http://fedora.redhat.com/docs/selinux-faq-fc5/#id2961385) Or you can disable > SELinux protection altogether. Disabling SELinux protection is not recommended. > Please file a bug report (http://bugzilla.redhat.com/bugzilla/enter_bug.cgi) > against this package. > > Additional Information: > > Source Context system_u:system_r:consolekit_t:s0-s0:c0.c1023 > Target Context system_u:system_r:consolekit_t:s0-s0:c0.c1023 > Target Objects None [ capability ] > Source console-kit-dae > Source Path /usr/sbin/console-kit-daemon > Port <Unknown> > Host riohigh > Source RPM Packages ConsoleKit-0.3.0-2.fc10 > Target RPM Packages > Policy RPM selinux-policy-3.5.10-3.fc10 > Selinux Enabled True > Policy Type targeted > MLS Enabled True > Enforcing Mode Enforcing > Plugin Name catchall > Host Name riohigh > Platform Linux riohigh 2.6.27-3.fc10.i686 #1 SMP Fri Oct 10 > 01:26:26 EDT 2008 i686 athlon > Alert Count 87 > First Seen Fri 03 Oct 2008 06:14:33 PM CDT > Last Seen Thu 16 Oct 2008 06:33:02 AM CDT > Local ID 0c8f36ea-d6b2-4646-ba59-1cdf5e6a0ee0 > Line Numbers > > Raw Audit Messages > > node=riohigh type=AVC msg=audit(1224156782.948:86): avc: denied { sys_resource } for pid=1770 comm="console-kit-dae" capability=24 scontext=system_u:system_r:consolekit_t:s0-s0:c0.c1023 tcontext=system_u:system_r:consolekit_t:s0-s0:c0.c1023 tclass=capability > > node=riohigh type=SYSCALL msg=audit(1224156782.948:86): arch=40000003 syscall=4 success=yes exit=674 a0=1a a1=8c4b790 a2=2a2 a3=8c4b790 items=0 ppid=1 pid=1770 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="console-kit-dae" exe="/usr/sbin/console-kit-daemon" subj=system_u:system_r:consolekit_t:s0-s0:c0.c1023 key=(null) > > > > I had not encountered these ones before. And before applying the fixes, I will ask if no one has encountered these ones before. > > TIA, > > > Antonio > > > > > > -- > fedora-selinux-list mailing list > fedora-selinux-list@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/fedora-selinux-list The sys_resource ones seem to be a bug in the kernel, since every confined domain seems to be getting a denial. The exstack one is probably caused by a badly built executable or a bad library. You can execute the chcon command to allow it to run or turn off the check. -- fedora-test-list mailing list fedora-test-list@xxxxxxxxxx To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-test-list
