BSD kernels provide several security levels, giving the administrator a starting point in tuning the operating system to meet the security needs of a specific environment. Details regarding each BSD's securelevels and their ramifications can be found in init(8). As securelevels increase, the kernel is prevented from executing some operations such as
• Loading or unloading kernel modules
• Unsetting file flags
• Unmounting filesystems
• Modifying firewall rules
• Decreasing the securelevel
It should be noted that the protections provided by securelevels can be easily bypassed by anyone with single-user mode access. This is one reason why physically securing systems is always an important component when creating a secure environment.
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