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DescriptionNikolai Kondrashov
2017-02-23 12:17:04 UTC
Description of problem:
FreeRADIUS uses PCRE JIT feature, which mmaps memory with PROT_WRITE|PROT_EXEC to store compiled binary code, later to be executed. The mmap is denied by SELinux, producing an AVC failure in audit logs:
type=AVC msg=audit(1480946786.958:3174): avc: denied { execmem } for pid=32684 comm="radiusd" scontext=system_u:system_r:radiusd_t:s0 tcontext=system_u:system_r:radiusd_t:s0 tclass=process
type=SYSCALL msg=audit(1480946786.958:3174): arch=c000003e syscall=9 success=no exit=-13 a0=0 a1=10000 a2=7 a3=22 items=0 ppid=1 pid=32684 auid=4294967295 uid=0 gid=95 euid=95 suid=0 fsuid=95 egid=95 sgid=95 fsgid=95 tty=(none) ses=4294967295 comm="radiusd" exe="/usr/sbin/radiusd" subj=system_u:system_r:radiusd_t:s0 key=(null)
FreeRADIUS functionality is not affected by that denial, only performance. It is likely that the performance hit is not significant in most cases.
Please consider either silencing these failures, or adding an SELinux boolean allowing FreeRADIUS mmap with PROT_WRITE|PROT_EXEC, disabled by default.
Version-Release number of selected component (if applicable):
selinux-policy-3.13.1-102.el7_3.13.noarch
selinux-policy-targeted-3.13.1-102.el7_3.13.noarch
freeradius-3.0.12-2.el7.x86_64
pcre-8.32-15.el7_2.1.x86_64
How reproducible:
Always
Steps to Reproduce:
sudo service radiusd start
sudo grep 'denied.*execmem.*radiusd' /var/log/audit/audit.log | tail -n1
Actual results:
type=AVC msg=audit(1487851866.354:329): avc: denied { execmem } for pid=11190 comm="radiusd" scontext=system_u:system_r:radiusd_t:s0 tcontext=system_u:system_r:radiusd_t:s0 tclass=process
Expected results:
No output.
Additional info:
Discussion with upstream:
https://github.com/FreeRADIUS/freeradius-server/issues/1865
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2017:1861
Description of problem: FreeRADIUS uses PCRE JIT feature, which mmaps memory with PROT_WRITE|PROT_EXEC to store compiled binary code, later to be executed. The mmap is denied by SELinux, producing an AVC failure in audit logs: type=AVC msg=audit(1480946786.958:3174): avc: denied { execmem } for pid=32684 comm="radiusd" scontext=system_u:system_r:radiusd_t:s0 tcontext=system_u:system_r:radiusd_t:s0 tclass=process type=SYSCALL msg=audit(1480946786.958:3174): arch=c000003e syscall=9 success=no exit=-13 a0=0 a1=10000 a2=7 a3=22 items=0 ppid=1 pid=32684 auid=4294967295 uid=0 gid=95 euid=95 suid=0 fsuid=95 egid=95 sgid=95 fsgid=95 tty=(none) ses=4294967295 comm="radiusd" exe="/usr/sbin/radiusd" subj=system_u:system_r:radiusd_t:s0 key=(null) FreeRADIUS functionality is not affected by that denial, only performance. It is likely that the performance hit is not significant in most cases. Please consider either silencing these failures, or adding an SELinux boolean allowing FreeRADIUS mmap with PROT_WRITE|PROT_EXEC, disabled by default. Version-Release number of selected component (if applicable): selinux-policy-3.13.1-102.el7_3.13.noarch selinux-policy-targeted-3.13.1-102.el7_3.13.noarch freeradius-3.0.12-2.el7.x86_64 pcre-8.32-15.el7_2.1.x86_64 How reproducible: Always Steps to Reproduce: sudo service radiusd start sudo grep 'denied.*execmem.*radiusd' /var/log/audit/audit.log | tail -n1 Actual results: type=AVC msg=audit(1487851866.354:329): avc: denied { execmem } for pid=11190 comm="radiusd" scontext=system_u:system_r:radiusd_t:s0 tcontext=system_u:system_r:radiusd_t:s0 tclass=process Expected results: No output. Additional info: Discussion with upstream: https://github.com/FreeRADIUS/freeradius-server/issues/1865