Commit 808e9df4 authored by Gleb Fotengauer-Malinovskiy's avatar Gleb Fotengauer-Malinovskiy Committed by Linus Torvalds
Browse files

userfaultfd: uapi: fix UFFDIO_CONTINUE ioctl request definition 



This ioctl request reads from uffdio_continue structure written by
userspace which justifies _IOC_WRITE flag.  It also writes back to that
structure which justifies _IOC_READ flag.

See NOTEs in include/uapi/asm-generic/ioctl.h for more information.

Fixes: f6191471 ("userfaultfd: add UFFDIO_CONTINUE ioctl")
Signed-off-by: default avatarGleb Fotengauer-Malinovskiy <glebfm@altlinux.org>
Acked-by: default avatarPeter Xu <peterx@redhat.com>
Reviewed-by: default avatarAxel Rasmussen <axelrasmussen@google.com>
Reviewed-by: default avatarDmitry V. Levin <ldv@altlinux.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 55fcd449

include/uapi/linux/userfaultfd.h

+2 −2
Original line number Diff line number Diff line
@@ -80,7 +80,7 @@ 
				      struct uffdio_zeropage)

#define UFFDIO_WRITEPROTECT	_IOWR(UFFDIO, _UFFDIO_WRITEPROTECT, \

				      struct uffdio_writeprotect)

#define UFFDIO_CONTINUE		_IOR(UFFDIO, _UFFDIO_CONTINUE,	\

#define UFFDIO_CONTINUE		_IOWR(UFFDIO, _UFFDIO_CONTINUE,	\

				      struct uffdio_continue)



/* read() structure */