Bug 799676
| Summary: | SELinux is preventing /usr/bin/dia from 'mmap_zero' accesses on the memprotect Unknown. | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | nomnex <nomnex> |
| Component: | selinux-policy | Assignee: | Miroslav Grepl <mgrepl> |
| Status: | CLOSED NOTABUG | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | medium | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | rawhide | CC: | dominick.grift, dwalsh, mgrepl, nomnex |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | i386 | ||
| OS: | Linux | ||
| Whiteboard: | setroubleshoot_trace_hash:14e7302ff3c4142d1d5aac78367d804c9fb24f65b7ee4c28f79de6f05e4f5322 | ||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2012-03-05 09:24:46 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
setroubleshoot tells you what to do. "mmap_zero" is pretty dangerous access which we do not want to allow by default. Does "dia" work correctly? Unfortunately Dia kept crashing after each new SELinux warning msg. I have follow the direction of the SELinux troubleshooting (well done, BTH), and I passed the command to allow "mmap_zero", although I don't know what I am doing. Am I the only Dia user on F15 affected by this warning? My understanding of SELinux is too vague (that's the police officer, with a stick, inside my box?) Nevertheless, why does Dia from the Fedora repository requests a custom rule, potentially dangerous? |
SELinux is preventing /usr/bin/dia from 'mmap_zero' accesses on the memprotect Unknown. ***** Plugin mmap_zero (53.1 confidence) suggests ************************** If you do not think /usr/bin/dia should need to mmap low memory in the kernel. Then you may be under attack by a hacker, this is a very dangerous access. Do contact your security administrator and report this issue. ***** Plugin catchall_boolean (42.6 confidence) suggests ******************* If you want to control the ability to mmap a low area of the address space, as configured by /proc/sys/kernel/mmap_min_addr. Then you must tell SELinux about this by enabling the 'mmap_low_allowed' boolean. Do setsebool -P mmap_low_allowed 1 ***** Plugin catchall (5.76 confidence) suggests *************************** If you believe that dia should be allowed mmap_zero access on the Unknown memprotect by default. Then you should report this as a bug. You can generate a local policy module to allow this access. Do allow this access for now by executing: # grep dia /var/log/audit/audit.log | audit2allow -M mypol # semodule -i mypol.pp 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 Unknown [ memprotect ] Source dia Source Path /usr/bin/dia Port <Unknown> Host (removed) Source RPM Packages dia-0.97-5.fc15 Target RPM Packages Policy RPM selinux-policy-3.9.16-51.fc15 Selinux Enabled True Policy Type targeted Enforcing Mode Enforcing Host Name (removed) Platform Linux (removed) 2.6.42.7-1.fc15.i686 #1 SMP Tue Feb 21 02:16:57 UTC 2012 i686 i686 Alert Count 154 First Seen Sun 04 Mar 2012 12:22:24 PM JST Last Seen Sun 04 Mar 2012 04:06:22 PM JST Local ID 6b1ef8ce-435c-45bd-abcb-3fefbb3683c1 Raw Audit Messages type=AVC msg=audit(1330844782.326:271): avc: denied { mmap_zero } for pid=7741 comm="dia" scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=memprotect type=SYSCALL msg=audit(1330844782.326:271): arch=i386 syscall=mmap2 success=no exit=EACCES a0=0 a1=58ac0 a2=1 a3=2 items=0 ppid=1 pid=7741 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=(none) ses=1 comm=dia exe=/usr/bin/dia subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null) Hash: dia,unconfined_t,unconfined_t,memprotect,mmap_zero audit2allow #============= unconfined_t ============== #!!!! This avc can be allowed using the boolean 'mmap_low_allowed' allow unconfined_t self:memprotect mmap_zero; audit2allow -R #============= unconfined_t ============== #!!!! This avc can be allowed using the boolean 'mmap_low_allowed' allow unconfined_t self:memprotect mmap_zero;