D12640.diff
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	Index: head/lib/libc/sys/posix_fallocate.2
	===================================================================
	--- head/lib/libc/sys/posix_fallocate.2
	+++ head/lib/libc/sys/posix_fallocate.2
	@@ -28,7 +28,7 @@
	.\" @(#)open.2 8.2 (Berkeley) 11/16/93
	.\" $FreeBSD$
	.\"
	-.Dd January 23, 2014
	+.Dd October 12, 2017
	.Dt POSIX_FALLOCATE 2
	.Os
	.Sh NAME
	@@ -118,6 +118,10 @@
	.It Bq Er ENOSPC
	There is insufficient free space remaining on the file system storage
	media.
	+.It Bq Er ENOTCAPABLE
	+The file descriptor
	+.Fa fd
	+has insufficient rights.
	.It Bq Er ESPIPE
	The
	.Fa fd
	Index: head/sys/kern/capabilities.conf
	===================================================================
	--- head/sys/kern/capabilities.conf
	+++ head/sys/kern/capabilities.conf
	@@ -488,6 +488,7 @@
	##
	## Allow I/O-related file descriptors, subject to capability rights.
	##
	+posix_fallocate
	pread
	preadv

	Index: head/sys/kern/vfs_syscalls.c
	===================================================================
	--- head/sys/kern/vfs_syscalls.c
	+++ head/sys/kern/vfs_syscalls.c
	@@ -4400,7 +4400,7 @@
	if (offset > OFF_MAX - len)
	return (EFBIG);
	AUDIT_ARG_FD(fd);
	- error = fget(td, fd, cap_rights_init(&rights, CAP_WRITE), &fp);
	+ error = fget(td, fd, cap_rights_init(&rights, CAP_PWRITE), &fp);
	if (error != 0)
	return (error);
	AUDIT_ARG_FILE(td->td_proc, fp);