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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: f619147104 ("userfaultfd: add UFFDIO_CONTINUE ioctl")
Signed-off-by: Gleb Fotengauer-Malinovskiy <glebfm@altlinux.org>
Acked-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Axel Rasmussen <axelrasmussen@google.com>
Reviewed-by: Dmitry V. Levin <ldv@altlinux.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Gleb Fotengauer-Malinovskiy 2021-06-25 20:36:55 +03:00 committed by Linus Torvalds
parent 55fcd4493d
commit 808e9df477
1 changed files with 2 additions and 2 deletions
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4
include/uapi/linux/userfaultfd.h
View File

@ -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 {