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Commit 91ac033d authored by Marc Dionne's avatar Marc Dionne Committed by Linus Torvalds
Browse files

CacheFiles: Fix the documentation to use the correct credential pointer names 



Adjust the CacheFiles documentation to use the correct names of the credential
pointers in task_struct.

The documentation was using names from the old versions of the credentials
patches.

Signed-off-by: default avatarMarc Dionne <marc.c.dionne@gmail.com>
Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent e5b89542

Documentation/filesystems/caching/cachefiles.txt

+4 −4
Original line number Diff line number Diff line
@@ -407,7 +407,7 @@ A NOTE ON SECURITY 
==================



CacheFiles makes use of the split security in the task_struct.  It allocates

its own task_security structure, and redirects current->act_as to point to it

its own task_security structure, and redirects current->cred to point to it

when it acts on behalf of another process, in that process's context.



The reason it does this is that it calls vfs_mkdir() and suchlike rather than
@@ -429,9 +429,9 @@ This means it may lose signals or ptrace events for example, and affects what 
the process looks like in /proc.



So CacheFiles makes use of a logical split in the security between the

objective security (task->sec) and the subjective security (task->act_as).  The

objective security holds the intrinsic security properties of a process and is

never overridden.  This is what appears in /proc, and is what is used when a

objective security (task->real_cred) and the subjective security (task->cred).

The objective security holds the intrinsic security properties of a process and

is never overridden.  This is what appears in /proc, and is what is used when a

process is the target of an operation by some other process (SIGKILL for

example).