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Date:      Sat, 18 Mar 2017 18:34:29 +0000 (UTC)
From:      Dmitry Chagin <dchagin@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r315505 - in head/sys: amd64/linux amd64/linux32 compat/linux i386/linux
Message-ID:  <201703181834.v2IIYTal075402@repo.freebsd.org>
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Author: dchagin
Date: Sat Mar 18 18:34:29 2017
New Revision: 315505
URL: https://svnweb.freebsd.org/changeset/base/315505

Log:
  Implement getrandom() syscall.
  Note. GRND_RANDOM option is not supported for now.
  
  MFC after:	1 month

Modified:
  head/sys/amd64/linux/linux_dummy.c
  head/sys/amd64/linux32/linux32_dummy.c
  head/sys/compat/linux/linux_misc.c
  head/sys/compat/linux/linux_misc.h
  head/sys/i386/linux/linux_dummy.c

Modified: head/sys/amd64/linux/linux_dummy.c
==============================================================================
--- head/sys/amd64/linux/linux_dummy.c	Sat Mar 18 18:31:45 2017	(r315504)
+++ head/sys/amd64/linux/linux_dummy.c	Sat Mar 18 18:34:29 2017	(r315505)
@@ -135,7 +135,6 @@ DUMMY(sched_getattr);
 DUMMY(renameat2);
 /* linux 3.15: */
 DUMMY(seccomp);
-DUMMY(getrandom);
 DUMMY(memfd_create);
 DUMMY(kexec_file_load);
 /* linux 3.18: */

Modified: head/sys/amd64/linux32/linux32_dummy.c
==============================================================================
--- head/sys/amd64/linux32/linux32_dummy.c	Sat Mar 18 18:31:45 2017	(r315504)
+++ head/sys/amd64/linux32/linux32_dummy.c	Sat Mar 18 18:34:29 2017	(r315505)
@@ -144,7 +144,6 @@ DUMMY(sched_getattr);
 DUMMY(renameat2);
 /* linux 3.15: */
 DUMMY(seccomp);
-DUMMY(getrandom);
 DUMMY(memfd_create);
 /* linux 3.18: */
 DUMMY(bpf);

Modified: head/sys/compat/linux/linux_misc.c
==============================================================================
--- head/sys/compat/linux/linux_misc.c	Sat Mar 18 18:31:45 2017	(r315504)
+++ head/sys/compat/linux/linux_misc.c	Sat Mar 18 18:34:29 2017	(r315505)
@@ -51,6 +51,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/proc.h>
 #include <sys/reboot.h>
 #include <sys/racct.h>
+#include <sys/random.h>
 #include <sys/resourcevar.h>
 #include <sys/sched.h>
 #include <sys/sdt.h>
@@ -65,6 +66,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/vnode.h>
 #include <sys/wait.h>
 #include <sys/cpuset.h>
+#include <sys/uio.h>
 
 #include <security/mac/mac_framework.h>
 
@@ -2508,3 +2510,27 @@ linux_to_bsd_waitopts(int options, int *
 	if (options & __WCLONE)
 		*bsdopts |= WLINUXCLONE;
 }
+
+int
+linux_getrandom(struct thread *td, struct linux_getrandom_args *args)
+{
+	struct uio uio;
+	struct iovec iov;
+
+	if (args->flags & ~(LINUX_GRND_NONBLOCK|LINUX_GRND_RANDOM))
+		return (EINVAL);
+	if (args->count > INT_MAX)
+		args->count = INT_MAX;
+
+	iov.iov_base = args->buf;
+	iov.iov_len = args->count;
+
+	uio.uio_iov = &iov;
+	uio.uio_iovcnt = 1;
+	uio.uio_resid = iov.iov_len;
+	uio.uio_segflg = UIO_USERSPACE;
+	uio.uio_rw = UIO_READ;
+	uio.uio_td = td;
+
+	return (read_random_uio(&uio, args->flags & LINUX_GRND_NONBLOCK));
+}

Modified: head/sys/compat/linux/linux_misc.h
==============================================================================
--- head/sys/compat/linux/linux_misc.h	Sat Mar 18 18:31:45 2017	(r315504)
+++ head/sys/compat/linux/linux_misc.h	Sat Mar 18 18:34:29 2017	(r315505)
@@ -145,6 +145,10 @@ extern int stclohz;
 
 #define	LINUX_RLIM_INFINITY	(~0UL)
 
+/* Linux getrandom flags */
+#define	LINUX_GRND_NONBLOCK	0x0001
+#define	LINUX_GRND_RANDOM	0x0002
+
 int linux_common_wait(struct thread *td, int pid, int *status,
 			int options, struct rusage *ru);
 void linux_to_bsd_waitopts(int options, int *bsdopts);

Modified: head/sys/i386/linux/linux_dummy.c
==============================================================================
--- head/sys/i386/linux/linux_dummy.c	Sat Mar 18 18:31:45 2017	(r315504)
+++ head/sys/i386/linux/linux_dummy.c	Sat Mar 18 18:34:29 2017	(r315505)
@@ -140,7 +140,6 @@ DUMMY(sched_getattr);
 DUMMY(renameat2);
 /* linux 3.15: */
 DUMMY(seccomp);
-DUMMY(getrandom);
 DUMMY(memfd_create);
 /* linux 3.18: */
 DUMMY(bpf);

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