kernel function to verify rootcontext

kernel function to verify rootcontext

[Matthew Thode]

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Is there a kernel function used to verify that a rootcontext is valid
(exists and/or is formatted correctly).

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-- Matthew Thode


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Re: kernel function to verify rootcontext

[Stephen Smalley]

On 11/05/2013 11:08 PM, Matthew Thode wrote:
> Is there a kernel function used to verify that a rootcontext is valid
> (exists and/or is formatted correctly).
> 

Not sure what you mean.  SELinux directly handles and consumes the
rootcontext= and other related mount options before they are passed
along to the filesystem code, so your filesystem doesn't need to do
anything with it.

security_context_to_sid() is the SELinux kernel function for validating
security contexts and mapping them to a security identifier (SID), but
you shouldn't call that from your filesystem code.

>From userspace, you can check a context by writing the context string to
/sys/fs/selinux/context or by calling the libselinux
security_check_context() function (which internally does the same thing)
and checking the result.




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