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2955f0b360
VFS operation, make use of the calling process's credential. This solution may not be ideal (there are a number of other possible proposals, including making use of the proc0 credential, adding a credential argument to the VFSOP, and switching from a hard-coded ucred to a hard-coded nfscred), it is simple and appears to work. The arguments against using simply crget() are fairly strong: it is the only place in the code (other than a nearly identical invocation in ncp) where crget() is invoked, other than in the process credential creation code; as ucred becomes extensible, this use of crget() without appropriate context results in less and less meaningful credential data. The implementation here will probably be tweaked as a result of experimentation and further exploration of the requirements. In the mean-time, it allows progress to be made in ucred expansion for new security models without causing a crash every time df is used on an NFS mounted file system. This code has been interop tested against FreeBSD and Solaris NFS servers. While using the process credentials should not introduce interop problems, please let me know if any turn out to exist. Reviewed by: freebsd-arch |
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