Copy on Write Credentials
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"Here's a new version of my credentials patch. It's still very basic, with only Ext3, (V)FAT, NFS, AFS, SELinux and keyrings compiled in on an x86_64 arch kernel,"stated David Howells. He described the patch as,"introduce a copy on write credentials record (struct cred). The fsuid, fsgid, supplementary groups list move into it (DAC security). The session, process and thread keyrings are reflected in it, but don't primarily reside there as they aren't per-thread and occasionally need to be instantiated or replaced by other threads or processes."
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