linux-kernel - [PATCH v2] userfaultfd: fix UFFDIO_CONTINUE ioctl request definition

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Message-Id: <20210601143432.1002481-1-glebfm@altlinux.org>
Date:   Tue,  1 Jun 2021 17:34:32 +0300
From:   Gleb Fotengauer-Malinovskiy <glebfm@...linux.org>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Peter Xu <peterx@...hat.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Lokesh Gidra <lokeshgidra@...gle.com>,
        linux-kernel@...r.kernel.org
Cc:     Gleb Fotengauer-Malinovskiy <glebfm@...linux.org>
Subject: [PATCH v2] userfaultfd: fix UFFDIO_CONTINUE ioctl request definition

This ioctl request reads from uffdio_continue structure which justifies
_IOC_READ flag.
See NOTEs in include/uapi/asm-generic/ioctl.h for more information.

Fixes: f619147104c8 ("userfaultfd: add UFFDIO_CONTINUE ioctl")
Signed-off-by: Gleb Fotengauer-Malinovskiy <glebfm@...linux.org>
Acked-by: Peter Xu <peterx@...hat.com>
---
 include/uapi/linux/userfaultfd.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

v2 fix commit message

diff --git a/include/uapi/linux/userfaultfd.h b/include/uapi/linux/userfaultfd.h
index bafbeb1a2624..650480f41f1d 100644
--- a/include/uapi/linux/userfaultfd.h
+++ b/include/uapi/linux/userfaultfd.h
@@ -80,8 +80,8 @@
 				      struct uffdio_zeropage)
 #define UFFDIO_WRITEPROTECT	_IOWR(UFFDIO, _UFFDIO_WRITEPROTECT, \
 				      struct uffdio_writeprotect)
-#define UFFDIO_CONTINUE		_IOR(UFFDIO, _UFFDIO_CONTINUE,	\
-				     struct uffdio_continue)
+#define UFFDIO_CONTINUE		_IOWR(UFFDIO, _UFFDIO_CONTINUE,	\
+				      struct uffdio_continue)
 
 /* read() structure */
 struct uffd_msg {
-- 
glebfm