Red Hat Bugzilla – Bug 839813
grub2-tools missing prelink excludes to avoid SELinux execstack limits
Last modified: 2013-07-10 19:55:11 EDT
Description of problem: prelink with SELinux enforcing and allow_execstack off causes prelink warnings and SELinux violations. Version-Release number of selected component (if applicable): selinux-policy-3.10.0-134 prelink-0.4.6-5 grub2-tools-2.0-0.37.beta6 How reproducible: Whenever prelink cron runs Steps to Reproduce: 1. SELinux enforcing, allow_execstack off 2. Allow prelink update cron to run 3. Check audit2allow -b and prelink.log to see errors Actual results: Prelink complains that it can't load the shared libraries, eg: /usr/sbin/prelink: /usr/bin/grub2-mkrelpath: Could not parse `/usr/bin/grub2-mkrelpath: error while loading shared libraries: /usr/bin/grub2-mkrelpath: cannot enable executable stack as shared object requires: Permission denied' SELinux complains about violations, eg: type=AVC msg=audit(1342132455.729:16995): avc: denied { execstack } for pid=9665 comm="ld-linux-x86-64" scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=process Expected results: No warnings or errors. Additional info: Since these are not-performance sensitive executables, the easiest solution is to blacklist them from prelink. This would be as simple as dropping a file into /etc/prelink.conf.d/grub2.conf (creating dir if prelink not already installed), with the following contents: # these have execstack, and break under selinux -b /usr/bin/grub2-script-check -b /usr/bin/grub2-mkrelpath -b /usr/bin/grub2-fstest -b /usr/sbin/grub2-bios-setup -b /usr/sbin/grub2-probe -b /usr/sbin/grub2-sparc64-setup This bug appears to be a result of 731111 (grub 2 depends on executable stacks), which doesn't appear to be close to being resolved yet :)
Should be fixed in 2.00-4 (in f18)
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This is fixed in F18, and F17 is nearing EOL, so closing as wontfix.