memfd_create(): add support for file sealing #2027
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The new function unix_file_new() allocates a file descriptor for an open file; it can be used when some operations have to be performed on an open file before creating a file descriptor (and thus making the file available to userspace). This function will be used by memfd_create() when adding support for file sealing.
This change enhances the tmpfs implementation so that it supports file sealing, and modifies memfd_create() so that it acts upon the MFD_ALLOW_SEALING flag when configuring the initial set of seals for the underlying tmpfs file. The fcntl() syscall now accepts 2 additional commands, needed for file sealing operations: F_ADD_SEALS and F_GET_SEALS. The fcntl runtime test has been amended to exercise this new feature.
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This change set enhances the tmpfs implementation so that it supports file sealing, and modifies memfd_create() so that it acts upon the MFD_ALLOW_SEALING flag when configuring the initial set of seals for the underlying tmpfs file.
The fcntl() syscall now accepts 2 additional commands, needed for file sealing operations: F_ADD_SEALS and F_GET_SEALS.
The fcntl runtime test has been amended to exercise this new feature.