Re: avc: denied { ptrace } messages

[Dominick Grift]

On 06/24/2010 08:39 PM, Radha Venkatesh (radvenka) wrote:
>  During the startup of one of our process, I notice a lot of avc
> denial
>  messages for ptrace, as shown below. I have tried the suggestions by
>  audit2allow, used the various macros for ptrace (also pasted below), but
>  nothing seems to work. Could you help?
>   
>  type=AVC msg=audit(1277403181.796:261073): avc:  denied  { ptrace } for
>  pid=27314 comm="ps" scontext=system_u:system_r:servm_t:s0
>  tcontext=system_u:system_r:udev_t:s0-s0:c0.c1023 tclass=process
>  type=SYSCALL msg=audit(1277403181.796:261073): arch=40000003 syscall=3
>  success=yes exit=181 a0=7 a1=11f900 a2=3ff a3=11f8a0 items=0 ppid=27313
>  pid=27314 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0
>  sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="ps" exe="/bin/ps"
>  subj=system_u:system_r:servm_t:s0 key=(null)
>  type=AVC msg=audit(1277403181.797:261074): avc:  denied  { ptrace } for
>  pid=27314 comm="ps" scontext=system_u:system_r:servm_t:s0
>  tcontext=system_u:system_r:setrans_t:s0-s0:c0.c1023 tclass=process
>  type=SYSCALL msg=audit(1277403181.797:261074): arch=40000003 syscall=3
>  success=yes exit=183 a0=7 a1=11f900 a2=3ff a3=11f8a0 items=0 ppid=27313
>  pid=27314 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0
>  sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="ps" exe="/bin/ps"
>  subj=system_u:system_r:servm_t:s0 key=(null)
>  type=AVC msg=audit(1277403181.799:261075): avc:  denied  { ptrace } for
>  pid=27314 comm="ps" scontext=system_u:system_r:servm_t:s0
>  tcontext=system_u:system_r:sshd_t:s0-s0:c0.c1023 tclass=process
>  type=SYSCALL msg=audit(1277403181.799:261075): arch=40000003 syscall=3
>  success=yes exit=187 a0=7 a1=11f900 a2=3ff a3=11f8a0 items=0 ppid=27313
>  pid=27314 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0
>  sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="ps" exe="/bin/ps"
>  subj=system_u:system_r:servm_t:s0 key=(null)
>  type=AVC msg=audit(1277403181.799:261076): avc:  denied  { ptrace } for
>  pid=27314 comm="ps" scontext=system_u:system_r:servm_t:s0
>  tcontext=system_u:system_r:crond_t:s0-s0:c0.c1023 tclass=process
>  type=SYSCALL msg=audit(1277403181.799:261076): arch=40000003 syscall=3
>  success=yes exit=185 a0=7 a1=11f900 a2=3ff a3=11f8a0 items=0 ppid=27313
>  pid=27314 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0
>  sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="ps" exe="/bin/ps"
>  subj=system_u:system_r:servm_t:s0 key=(null)
>  type=AVC msg=audit(1277403181.800:261077): avc:  denied  { ptrace } for
>  pid=27314 comm="ps" scontext=system_u:system_r:servm_t:s0
>  tcontext=root:sysadm_r:sysadm_t:s0-s0:c0.c1023 tclass=process
>  type=SYSCALL msg=audit(1277403181.800:261077): arch=40000003 syscall=3
>  success=yes exit=203 a0=7 a1=11f900 a2=3ff a3=11f8a0 items=0 ppid=27313
>  pid=27314 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0
>  sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="ps" exe="/bin/ps"
>  subj=system_u:system_r:servm_t:s0 key=(null)
>  type=AVC msg=audit(1277403181.801:261078): avc:  denied  { ptrace } for
>  pid=27314 comm="ps" scontext=system_u:system_r:servm_t:s0
>  tcontext=root:system_r:auditd_t:s0-s0:c0.c1023 tclass=process
>  type=SYSCALL msg=audit(1277403181.801:261078): arch=40000003 syscall=3
>  success=yes exit=200 a0=7 a1=11f900 a2=3ff a3=11f8a0 items=0 ppid=27313
>  pid=27314 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0
>  sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="ps" exe="/bin/ps"
>  subj=system_u:system_r:servm_t:s0 key=(null)
>  type=AVC msg=audit(1277403181.801:261079): avc:  denied  { ptrace } for
>  pid=27314 comm="ps" scontext=system_u:system_r:servm_t:s0
>  tcontext=root:system_r:audisp_t:s0-s0:c0.c1023 tclass=process
>   
>  The audit2allow tools suggests the below
>   
>  allow servm_t audisp_t:process ptrace;
>  allow servm_t auditd_t:process ptrace;
>  allow servm_t crond_t:process ptrace;
>   allow servm_t setrans_t:process ptrace;
>  allow servm_t sshd_t:process ptrace;
>  allow servm_t sysadm_t:process ptrace;
>  allow servm_t udev_t:process ptrace;
>   
>  However, when these rules were added, there was no change in the avc
>  messages. I also tried the macro
>   
>  domain_ptrace_all_domains(servm_t)
>   
>  and 
>   
>  allow servm_t self:capability { sys_ptrace };
>   
>  But none of this makes a difference to the avc messages generated. 
Looks like a mcs constraint issue. What does audit2why say?

>  Thanks,
>  Radha.
>  
>  
>   
>  
>  
>  
>  
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