userfaultfd.c (cecdd52a3dd312564f81a39df08378b7b39a2654) userfaultfd.c (2bad466cc9d9b4c3b4b16eb9c03c919b59561316)
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * fs/userfaultfd.c
4 *
5 * Copyright (C) 2007 Davide Libenzi <davidel@xmailserver.org>
6 * Copyright (C) 2008-2009 Red Hat, Inc.
7 * Copyright (C) 2015 Red Hat, Inc.
8 *

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103/* internal indication that UFFD_API ioctl was successfully executed */
104#define UFFD_FEATURE_INITIALIZED (1u << 31)
105
106static bool userfaultfd_is_initialized(struct userfaultfd_ctx *ctx)
107{
108 return ctx->features & UFFD_FEATURE_INITIALIZED;
109}
110
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * fs/userfaultfd.c
4 *
5 * Copyright (C) 2007 Davide Libenzi <davidel@xmailserver.org>
6 * Copyright (C) 2008-2009 Red Hat, Inc.
7 * Copyright (C) 2015 Red Hat, Inc.
8 *

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103/* internal indication that UFFD_API ioctl was successfully executed */
104#define UFFD_FEATURE_INITIALIZED (1u << 31)
105
106static bool userfaultfd_is_initialized(struct userfaultfd_ctx *ctx)
107{
108 return ctx->features & UFFD_FEATURE_INITIALIZED;
109}
110
111/*
112 * Whether WP_UNPOPULATED is enabled on the uffd context. It is only
113 * meaningful when userfaultfd_wp()==true on the vma and when it's
114 * anonymous.
115 */
116bool userfaultfd_wp_unpopulated(struct vm_area_struct *vma)
117{
118 struct userfaultfd_ctx *ctx = vma->vm_userfaultfd_ctx.ctx;
119
120 if (!ctx)
121 return false;
122
123 return ctx->features & UFFD_FEATURE_WP_UNPOPULATED;
124}
125
111static void userfaultfd_set_vm_flags(struct vm_area_struct *vma,
112 vm_flags_t flags)
113{
114 const bool uffd_wp_changed = (vma->vm_flags ^ flags) & VM_UFFD_WP;
115
116 vm_flags_reset(vma, flags);
117 /*
118 * For shared mappings, we want to enable writenotify while

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1966 uffdio_api.features &=
1967 ~(UFFD_FEATURE_MINOR_HUGETLBFS | UFFD_FEATURE_MINOR_SHMEM);
1968#endif
1969#ifndef CONFIG_HAVE_ARCH_USERFAULTFD_WP
1970 uffdio_api.features &= ~UFFD_FEATURE_PAGEFAULT_FLAG_WP;
1971#endif
1972#ifndef CONFIG_PTE_MARKER_UFFD_WP
1973 uffdio_api.features &= ~UFFD_FEATURE_WP_HUGETLBFS_SHMEM;
126static void userfaultfd_set_vm_flags(struct vm_area_struct *vma,
127 vm_flags_t flags)
128{
129 const bool uffd_wp_changed = (vma->vm_flags ^ flags) & VM_UFFD_WP;
130
131 vm_flags_reset(vma, flags);
132 /*
133 * For shared mappings, we want to enable writenotify while

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1981 uffdio_api.features &=
1982 ~(UFFD_FEATURE_MINOR_HUGETLBFS | UFFD_FEATURE_MINOR_SHMEM);
1983#endif
1984#ifndef CONFIG_HAVE_ARCH_USERFAULTFD_WP
1985 uffdio_api.features &= ~UFFD_FEATURE_PAGEFAULT_FLAG_WP;
1986#endif
1987#ifndef CONFIG_PTE_MARKER_UFFD_WP
1988 uffdio_api.features &= ~UFFD_FEATURE_WP_HUGETLBFS_SHMEM;
1989 uffdio_api.features &= ~UFFD_FEATURE_WP_UNPOPULATED;
1974#endif
1975 uffdio_api.ioctls = UFFD_API_IOCTLS;
1976 ret = -EFAULT;
1977 if (copy_to_user(buf, &uffdio_api, sizeof(uffdio_api)))
1978 goto out;
1979
1980 /* only enable the requested features for this uffd context */
1981 ctx_features = uffd_ctx_features(features);

--- 202 unchanged lines hidden --- 		1990#endif
1991 uffdio_api.ioctls = UFFD_API_IOCTLS;
1992 ret = -EFAULT;
1993 if (copy_to_user(buf, &uffdio_api, sizeof(uffdio_api)))
1994 goto out;
1995
1996 /* only enable the requested features for this uffd context */
1997 ctx_features = uffd_ctx_features(features);

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