SELinux is preventing /nix/store/gvn25bbmcm5ffkdzwvin7a0d8mmmfgfc-curl-7.21.0/bin/curl from using the 'execstack' accesses on a process.

*****  Plugin catchall_boolean (89.3 confidence) suggests  *******************

If you want to allow unconfined executables to make their stack executable.  This should never, ever be necessary. Probably indicates a badly coded executable, but could indicate an attack. This executable should be reported in bugzilla
Then you must tell SELinux about this by enabling the 'allow_execstack' boolean.
Do
setsebool -P allow_execstack 1

*****  Plugin catchall (11.6 confidence) suggests  ***************************

If you believe that curl should be allowed execstack access on processes labeled initrc_t 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 curl /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp

Additional Information:
Source Context                system_u:system_r:initrc_t:s0
Target Context                system_u:system_r:initrc_t:s0
Target Objects                Unknown [ process ]
Source                        curl
Source Path                   /nix/store/gvn25bbmcm5ffkdzwvin7a0d8mmmfgfc-
                              curl-7.21.0/bin/curl
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.9.7-40.fc14
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 2.6.35.12-90.fc14.i686 #1 SMP Fri Apr
                              22 16:14:44 UTC 2011 i686 i686
Alert Count                   16
First Seen                    Fri 29 Apr 2011 12:39:45 PM HST
Last Seen                     Sat 30 Apr 2011 02:15:27 PM HST
Local ID                      b6c91c98-6ebb-495f-a9ef-5b7afffc1c3d

Raw Audit Messages
type=AVC msg=audit(1304208927.12:39877): avc:  denied  { execstack } for  pid=1129 comm="curl" scontext=system_u:system_r:initrc_t:s0 tcontext=system_u:system_r:initrc_t:s0 tclass=process


type=SYSCALL msg=audit(1304208927.12:39877): arch=i386 syscall=mprotect success=no exit=EACCES a0=bfffa000 a1=1000 a2=1000007 a3=bfffa670 items=0 ppid=1117 pid=1129 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm=curl exe=/nix/store/gvn25bbmcm5ffkdzwvin7a0d8mmmfgfc-curl-7.21.0/bin/curl subj=system_u:system_r:initrc_t:s0 key=(null)

Hash: curl,initrc_t,initrc_t,process,execstack

audit2allow

#============= initrc_t ==============
#!!!! This avc can be allowed using the boolean 'allow_execstack'

allow initrc_t self:process execstack;

audit2allow -R

#============= initrc_t ==============
#!!!! This avc can be allowed using the boolean 'allow_execstack'

allow initrc_t self:process execstack;