avc_sid_to_context - Linux


The avc_sid_to_context command is a powerful tool for converting a Security Identification (SID) into the corresponding Security Context (SELinux Context). This translation is particularly useful in security analysis, troubleshooting, and system auditing.


avc_sid_to_context [options] <sid>


  • -V, –version: Display version information and exit.
  • -h, –help: Display usage and exit.
  • -t, –type: Specify SID type (default: sid). Possible values are: sid, sidcontext, user, role, type, range, avtab.
  • -n: Print the context in the format used by the kernel.


Convert SID to Context

To convert a SID to a SELinux context:

avc_sid_to_context s0

Convert User or Role SID to Context

To retrieve the context associated with a user or role, specify the -t option:

avc_sid_to_context -t user s0-s0

Output Kernel-Formatted Context

To output the context in the format used by the Linux kernel, use the -n option:

avc_sid_to_context -n s0

Common Issues

  • Invalid SID: The specified SID may be invalid or in an unrecognized format. Ensure that the SID is correct.
  • Permission Denied: You may require root privileges to execute this command. Try running the command with sudo.


avc_sid_to_context can be used in conjunction with other SELinux-related tools:

  • ausearch: To analyze SELinux audit logs.
  • getenforce: To determine the current SELinux enforcement mode.
  • setenforce: To modify the SELinux enforcement mode.

Related Commands

  • getsebool
  • setsebool
  • checksemac