X-Git-Url: https://granicus.if.org/sourcecode?a=blobdiff_plain;f=userfaultfd.c;h=aeeb3eabc663defccd5cda3081195630268b795f;hb=645eb6405b198497b8ee023090582410103b5c70;hp=7f8e3e4663258564fe66ba806b950631c1982700;hpb=a6ebdb149edadac7ddb793448778bd8643003d27;p=strace

diff --git a/userfaultfd.c b/userfaultfd.c
index 7f8e3e46..aeeb3eab 100644
--- a/userfaultfd.c
+++ b/userfaultfd.c
@@ -1,3 +1,30 @@
+/*
+ * Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
 #include "defs.h"
 #include <fcntl.h>
 
@@ -9,3 +36,124 @@ SYS_FUNC(userfaultfd)
 
 	return RVAL_DECODED | RVAL_FD;
 }
+
+#ifdef HAVE_LINUX_USERFAULTFD_H
+# include <linux/ioctl.h>
+# include <linux/userfaultfd.h>
+
+# include "xlat/uffd_api_flags.h"
+# include "xlat/uffd_copy_flags.h"
+# include "xlat/uffd_register_ioctl_flags.h"
+# include "xlat/uffd_register_mode_flags.h"
+# include "xlat/uffd_zeropage_flags.h"
+
+static void
+tprintf_uffdio_range(const struct uffdio_range *range)
+{
+	tprintf("{start=%#" PRI__x64 ", len=%#" PRI__x64 "}",
+		range->start, range->len);
+}
+
+int
+uffdio_ioctl(struct tcb *const tcp, const unsigned int code,
+	     const kernel_ulong_t arg)
+{
+	switch (code) {
+	case UFFDIO_API: {
+		struct uffdio_api ua;
+		if (entering(tcp)) {
+			tprints(", ");
+			if (umove_or_printaddr(tcp, arg, &ua))
+				return RVAL_DECODED | 1;
+			/* Features is intended to contain some flags, but
+			 * there aren't any defined yet.
+			 */
+			tprintf("{api=%#" PRI__x64
+				", features=%#" PRI__x64,
+				ua.api, ua.features);
+		} else {
+			if (!syserror(tcp) && !umove(tcp, arg, &ua)) {
+				tprintf(", features.out=%#" PRI__x64
+					", ioctls=", ua.features);
+				printflags64(uffd_api_flags, ua.ioctls,
+					     "_UFFDIO_???");
+			}
+			tprints("}");
+		}
+		return 1;
+	}
+
+	case UFFDIO_COPY: {
+		struct uffdio_copy uc;
+		if (entering(tcp)) {
+			tprints(", ");
+			if (umove_or_printaddr(tcp, arg, &uc))
+				return RVAL_DECODED | 1;
+			tprintf("{dst=%#" PRI__x64 ", src=%#" PRI__x64
+				", len=%#" PRI__x64 ", mode=",
+				uc.dst, uc.src, uc.len);
+			printflags64(uffd_copy_flags, uc.mode,
+				     "UFFDIO_COPY_???");
+		} else {
+			if (!syserror(tcp) && !umove(tcp, arg, &uc))
+				tprintf(", copy=%#" PRI__x64, uc.copy);
+			tprints("}");
+		}
+		return 1;
+	}
+
+	case UFFDIO_REGISTER: {
+		struct uffdio_register ur;
+		if (entering(tcp)) {
+			tprints(", ");
+			if (umove_or_printaddr(tcp, arg, &ur))
+				return RVAL_DECODED | 1;
+			tprints("{range=");
+			tprintf_uffdio_range(&ur.range);
+			tprints(", mode=");
+			printflags64(uffd_register_mode_flags, ur.mode,
+				     "UFFDIO_REGISTER_MODE_???");
+		} else {
+			if (!syserror(tcp) && !umove(tcp, arg, &ur)) {
+				tprints(", ioctls=");
+				printflags64(uffd_register_ioctl_flags,
+					     ur.ioctls, "UFFDIO_???");
+			}
+			tprints("}");
+		}
+		return 1;
+	}
+
+	case UFFDIO_UNREGISTER:
+	case UFFDIO_WAKE: {
+		struct uffdio_range ura;
+		tprints(", ");
+		if (!umove_or_printaddr(tcp, arg, &ura))
+			tprintf_uffdio_range(&ura);
+		return RVAL_DECODED | 1;
+	}
+
+	case UFFDIO_ZEROPAGE: {
+		struct uffdio_zeropage uz;
+		if (entering(tcp)) {
+			tprints(", ");
+			if (umove_or_printaddr(tcp, arg, &uz))
+				return RVAL_DECODED | 1;
+			tprints("{range=");
+			tprintf_uffdio_range(&uz.range);
+			tprints(", mode=");
+			printflags64(uffd_zeropage_flags, uz.mode,
+				     "UFFDIO_ZEROPAGE_???");
+		} else {
+			if (!syserror(tcp) && !umove(tcp, arg, &uz))
+				tprintf(", zeropage=%#" PRI__x64, uz.zeropage);
+			tprints("}");
+		}
+		return 1;
+	}
+
+	default:
+		return RVAL_DECODED;
+	}
+}
+#endif /* HAVE_LINUX_USERFAULTFD_H */