svn commit: r193850 - head/sys/kern
Edward Tomasz Napierala
trasz at FreeBSD.org
Tue Jun 9 19:51:23 UTC 2009
Author: trasz
Date: Tue Jun 9 19:51:22 2009
New Revision: 193850
URL: http://svn.freebsd.org/changeset/base/193850
Log:
Add part of NFSv4 ACL kernel support code that is required for the upcoming
libc changes to work. Not connected to the kernel build yet; for now,
it will be compiled into libc.
Reviewed by: rwatson
Added:
head/sys/kern/subr_acl_nfs4.c (contents, props changed)
Added: head/sys/kern/subr_acl_nfs4.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/kern/subr_acl_nfs4.c Tue Jun 9 19:51:22 2009 (r193850)
@@ -0,0 +1,579 @@
+/*-
+ * Copyright (c) 2008 Edward Tomasz Napierała <trasz at FreeBSD.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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+ */
+
+/*
+ * ACL support routines specific to NFSv4 access control lists. These are
+ * utility routines for code common across file systems implementing NFSv4
+ * ACLs.
+ */
+
+#ifdef _KERNEL
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/mount.h>
+#include <sys/priv.h>
+#include <sys/vnode.h>
+#include <sys/errno.h>
+#include <sys/stat.h>
+#include <sys/acl.h>
+#else
+#include <errno.h>
+#include <assert.h>
+#include <sys/acl.h>
+#include <sys/stat.h>
+#define KASSERT(a, b) assert(a)
+#define CTASSERT(a)
+#endif
+
+static int
+_acl_entry_matches(struct acl_entry *entry, acl_tag_t tag, acl_perm_t perm,
+ acl_entry_type_t entry_type)
+{
+ if (entry->ae_tag != tag)
+ return (0);
+
+ if (entry->ae_id != ACL_UNDEFINED_ID)
+ return (0);
+
+ if (entry->ae_perm != perm)
+ return (0);
+
+ if (entry->ae_entry_type != entry_type)
+ return (0);
+
+ if (entry->ae_flags != 0)
+ return (0);
+
+ return (1);
+}
+
+static struct acl_entry *
+_acl_append(struct acl *aclp, acl_tag_t tag, acl_perm_t perm,
+ acl_entry_type_t entry_type)
+{
+ struct acl_entry *entry;
+
+ KASSERT(aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES,
+ ("aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES"));
+
+ entry = &(aclp->acl_entry[aclp->acl_cnt]);
+ aclp->acl_cnt++;
+
+ entry->ae_tag = tag;
+ entry->ae_id = ACL_UNDEFINED_ID;
+ entry->ae_perm = perm;
+ entry->ae_entry_type = entry_type;
+ entry->ae_flags = 0;
+
+ return (entry);
+}
+
+static struct acl_entry *
+_acl_duplicate_entry(struct acl *aclp, int entry_index)
+{
+ int i;
+
+ KASSERT(aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES,
+ ("aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES"));
+
+ for (i = aclp->acl_cnt; i > entry_index; i--)
+ aclp->acl_entry[i] = aclp->acl_entry[i - 1];
+
+ aclp->acl_cnt++;
+
+ return (&(aclp->acl_entry[entry_index + 1]));
+}
+
+void
+acl_nfs4_sync_acl_from_mode(struct acl *aclp, mode_t mode, int file_owner_id)
+{
+ int i, meets, must_append;
+ struct acl_entry *entry, *copy, *previous,
+ *a1, *a2, *a3, *a4, *a5, *a6;
+ mode_t amode;
+ const int READ = 04;
+ const int WRITE = 02;
+ const int EXEC = 01;
+
+ KASSERT(aclp->acl_cnt >= 0, ("aclp->acl_cnt >= 0"));
+ KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES,
+ ("aclp->acl_cnt <= ACL_MAX_ENTRIES"));
+
+ /*
+ * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt
+ *
+ * 3.16.6.3. Applying a Mode to an Existing ACL
+ */
+
+ /*
+ * 1. For each ACE:
+ */
+ for (i = 0; i < aclp->acl_cnt; i++) {
+ entry = &(aclp->acl_entry[i]);
+
+ /*
+ * 1.1. If the type is neither ALLOW or DENY - skip.
+ */
+ if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW &&
+ entry->ae_entry_type != ACL_ENTRY_TYPE_DENY)
+ continue;
+
+ /*
+ * 1.2. If ACL_ENTRY_INHERIT_ONLY is set - skip.
+ */
+ if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY)
+ continue;
+
+ /*
+ * 1.3. If ACL_ENTRY_FILE_INHERIT or ACL_ENTRY_DIRECTORY_INHERIT
+ * are set:
+ */
+ if (entry->ae_flags &
+ (ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT)) {
+ /*
+ * 1.3.1. A copy of the current ACE is made, and placed
+ * in the ACL immediately following the current
+ * ACE.
+ */
+ copy = _acl_duplicate_entry(aclp, i);
+
+ /*
+ * 1.3.2. In the first ACE, the flag
+ * ACL_ENTRY_INHERIT_ONLY is set.
+ */
+ entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY;
+
+ /*
+ * 1.3.3. In the second ACE, the following flags
+ * are cleared:
+ * ACL_ENTRY_FILE_INHERIT,
+ * ACL_ENTRY_DIRECTORY_INHERIT,
+ * ACL_ENTRY_NO_PROPAGATE_INHERIT.
+ */
+ copy->ae_flags &= ~(ACL_ENTRY_FILE_INHERIT |
+ ACL_ENTRY_DIRECTORY_INHERIT |
+ ACL_ENTRY_NO_PROPAGATE_INHERIT);
+
+ /*
+ * The algorithm continues on with the second ACE.
+ */
+ i++;
+ entry = copy;
+ }
+
+ /*
+ * 1.4. If it's owner@, group@ or everyone@ entry, clear
+ * ACL_READ_DATA, ACL_WRITE_DATA, ACL_APPEND_DATA
+ * and ACL_EXECUTE. Continue to the next entry.
+ */
+ if (entry->ae_tag == ACL_USER_OBJ ||
+ entry->ae_tag == ACL_GROUP_OBJ ||
+ entry->ae_tag == ACL_EVERYONE) {
+ entry->ae_perm &= ~(ACL_READ_DATA | ACL_WRITE_DATA |
+ ACL_APPEND_DATA | ACL_EXECUTE);
+ continue;
+ }
+
+ /*
+ * 1.5. Otherwise, if the "who" field did not match one
+ * of OWNER@, GROUP@, EVERYONE@:
+ *
+ * 1.5.1. If the type is ALLOW, check the preceding ACE.
+ * If it does not meet all of the following criteria:
+ */
+ if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW)
+ continue;
+
+ meets = 0;
+ if (i > 0) {
+ meets = 1;
+ previous = &(aclp->acl_entry[i - 1]);
+
+ /*
+ * 1.5.1.1. The type field is DENY,
+ */
+ if (previous->ae_entry_type != ACL_ENTRY_TYPE_DENY)
+ meets = 0;
+
+ /*
+ * 1.5.1.2. The "who" field is the same as the current
+ * ACE,
+ *
+ * 1.5.1.3. The flag bit ACE4_IDENTIFIER_GROUP
+ * is the same as it is in the current ACE,
+ * and no other flag bits are set,
+ */
+ if (previous->ae_id != entry->ae_id ||
+ previous->ae_tag != entry->ae_tag)
+ meets = 0;
+
+ if (previous->ae_flags)
+ meets = 0;
+
+ /*
+ * 1.5.1.4. The mask bits are a subset of the mask bits
+ * of the current ACE, and are also subset of
+ * the following: ACL_READ_DATA,
+ * ACL_WRITE_DATA, ACL_APPEND_DATA, ACL_EXECUTE
+ */
+ if (previous->ae_perm & ~(entry->ae_perm))
+ meets = 0;
+
+ if (previous->ae_perm & ~(ACL_READ_DATA |
+ ACL_WRITE_DATA | ACL_APPEND_DATA | ACL_EXECUTE))
+ meets = 0;
+ }
+
+ if (!meets) {
+ /*
+ * Then the ACE of type DENY, with a who equal
+ * to the current ACE, flag bits equal to
+ * (<current ACE flags> & <ACE_IDENTIFIER_GROUP>)
+ * and no mask bits, is prepended.
+ */
+ previous = entry;
+ entry = _acl_duplicate_entry(aclp, i);
+
+ /* Adjust counter, as we've just added an entry. */
+ i++;
+
+ previous->ae_tag = entry->ae_tag;
+ previous->ae_id = entry->ae_id;
+ previous->ae_flags = entry->ae_flags;
+ previous->ae_perm = 0;
+ previous->ae_entry_type = ACL_ENTRY_TYPE_DENY;
+ }
+
+ /*
+ * 1.5.2. The following modifications are made to the prepended
+ * ACE. The intent is to mask the following ACE
+ * to disallow ACL_READ_DATA, ACL_WRITE_DATA,
+ * ACL_APPEND_DATA, or ACL_EXECUTE, based upon the group
+ * permissions of the new mode. As a special case,
+ * if the ACE matches the current owner of the file,
+ * the owner bits are used, rather than the group bits.
+ * This is reflected in the algorithm below.
+ */
+ amode = mode >> 3;
+
+ /*
+ * If ACE4_IDENTIFIER_GROUP is not set, and the "who" field
+ * in ACE matches the owner of the file, we shift amode three
+ * more bits, in order to have the owner permission bits
+ * placed in the three low order bits of amode.
+ */
+ if (entry->ae_tag == ACL_USER && entry->ae_id == file_owner_id)
+ amode = amode >> 3;
+
+ if (entry->ae_perm & ACL_READ_DATA) {
+ if (amode & READ)
+ previous->ae_perm &= ~ACL_READ_DATA;
+ else
+ previous->ae_perm |= ACL_READ_DATA;
+ }
+
+ if (entry->ae_perm & ACL_WRITE_DATA) {
+ if (amode & WRITE)
+ previous->ae_perm &= ~ACL_WRITE_DATA;
+ else
+ previous->ae_perm |= ACL_WRITE_DATA;
+ }
+
+ if (entry->ae_perm & ACL_APPEND_DATA) {
+ if (amode & WRITE)
+ previous->ae_perm &= ~ACL_APPEND_DATA;
+ else
+ previous->ae_perm |= ACL_APPEND_DATA;
+ }
+
+ if (entry->ae_perm & ACL_EXECUTE) {
+ if (amode & EXEC)
+ previous->ae_perm &= ~ACL_EXECUTE;
+ else
+ previous->ae_perm |= ACL_EXECUTE;
+ }
+
+ /*
+ * 1.5.3. If ACE4_IDENTIFIER_GROUP is set in the flags
+ * of the ALLOW ace:
+ *
+ * XXX: This point is not there in the Falkner's draft.
+ */
+ if (entry->ae_tag == ACL_GROUP &&
+ entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) {
+ mode_t extramode, ownermode;
+ extramode = (mode >> 3) & 07;
+ ownermode = mode >> 6;
+ extramode &= ~ownermode;
+
+ if (extramode) {
+ if (extramode & READ) {
+ entry->ae_perm &= ~ACL_READ_DATA;
+ previous->ae_perm &= ~ACL_READ_DATA;
+ }
+
+ if (extramode & WRITE) {
+ entry->ae_perm &=
+ ~(ACL_WRITE_DATA | ACL_APPEND_DATA);
+ previous->ae_perm &=
+ ~(ACL_WRITE_DATA | ACL_APPEND_DATA);
+ }
+
+ if (extramode & EXEC) {
+ entry->ae_perm &= ~ACL_EXECUTE;
+ previous->ae_perm &= ~ACL_EXECUTE;
+ }
+ }
+ }
+ }
+
+ /*
+ * 2. If there at least six ACEs, the final six ACEs are examined.
+ * If they are not equal to what we want, append six ACEs.
+ */
+ must_append = 0;
+ if (aclp->acl_cnt < 6) {
+ must_append = 1;
+ } else {
+ a6 = &(aclp->acl_entry[aclp->acl_cnt - 1]);
+ a5 = &(aclp->acl_entry[aclp->acl_cnt - 2]);
+ a4 = &(aclp->acl_entry[aclp->acl_cnt - 3]);
+ a3 = &(aclp->acl_entry[aclp->acl_cnt - 4]);
+ a2 = &(aclp->acl_entry[aclp->acl_cnt - 5]);
+ a1 = &(aclp->acl_entry[aclp->acl_cnt - 6]);
+
+ if (!_acl_entry_matches(a1, ACL_USER_OBJ, 0,
+ ACL_ENTRY_TYPE_DENY))
+ must_append = 1;
+ if (!_acl_entry_matches(a2, ACL_USER_OBJ, ACL_WRITE_ACL |
+ ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES |
+ ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW))
+ must_append = 1;
+ if (!_acl_entry_matches(a3, ACL_GROUP_OBJ, 0,
+ ACL_ENTRY_TYPE_DENY))
+ must_append = 1;
+ if (!_acl_entry_matches(a4, ACL_GROUP_OBJ, 0,
+ ACL_ENTRY_TYPE_ALLOW))
+ must_append = 1;
+ if (!_acl_entry_matches(a5, ACL_EVERYONE, ACL_WRITE_ACL |
+ ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES |
+ ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY))
+ must_append = 1;
+ if (!_acl_entry_matches(a6, ACL_EVERYONE, ACL_READ_ACL |
+ ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS |
+ ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW))
+ must_append = 1;
+ }
+
+ if (must_append) {
+ KASSERT(aclp->acl_cnt + 6 <= ACL_MAX_ENTRIES,
+ ("aclp->acl_cnt <= ACL_MAX_ENTRIES"));
+
+ a1 = _acl_append(aclp, ACL_USER_OBJ, 0, ACL_ENTRY_TYPE_DENY);
+ a2 = _acl_append(aclp, ACL_USER_OBJ, ACL_WRITE_ACL |
+ ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES |
+ ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW);
+ a3 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_DENY);
+ a4 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_ALLOW);
+ a5 = _acl_append(aclp, ACL_EVERYONE, ACL_WRITE_ACL |
+ ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES |
+ ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY);
+ a6 = _acl_append(aclp, ACL_EVERYONE, ACL_READ_ACL |
+ ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS |
+ ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW);
+
+ KASSERT(a1 != NULL && a2 != NULL && a3 != NULL && a4 != NULL &&
+ a5 != NULL && a6 != NULL, ("couldn't append to ACL."));
+ }
+
+ /*
+ * 3. The final six ACEs are adjusted according to the incoming mode.
+ */
+ if (mode & S_IRUSR)
+ a2->ae_perm |= ACL_READ_DATA;
+ else
+ a1->ae_perm |= ACL_READ_DATA;
+ if (mode & S_IWUSR)
+ a2->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
+ else
+ a1->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
+ if (mode & S_IXUSR)
+ a2->ae_perm |= ACL_EXECUTE;
+ else
+ a1->ae_perm |= ACL_EXECUTE;
+
+ if (mode & S_IRGRP)
+ a4->ae_perm |= ACL_READ_DATA;
+ else
+ a3->ae_perm |= ACL_READ_DATA;
+ if (mode & S_IWGRP)
+ a4->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
+ else
+ a3->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
+ if (mode & S_IXGRP)
+ a4->ae_perm |= ACL_EXECUTE;
+ else
+ a3->ae_perm |= ACL_EXECUTE;
+
+ if (mode & S_IROTH)
+ a6->ae_perm |= ACL_READ_DATA;
+ else
+ a5->ae_perm |= ACL_READ_DATA;
+ if (mode & S_IWOTH)
+ a6->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
+ else
+ a5->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
+ if (mode & S_IXOTH)
+ a6->ae_perm |= ACL_EXECUTE;
+ else
+ a5->ae_perm |= ACL_EXECUTE;
+}
+
+void
+acl_nfs4_sync_mode_from_acl(mode_t *_mode, const struct acl *aclp)
+{
+ int i;
+ mode_t old_mode = *_mode, mode = 0, seen = 0;
+ const struct acl_entry *entry;
+
+ KASSERT(aclp->acl_cnt > 0, ("aclp->acl_cnt > 0"));
+ KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES,
+ ("aclp->acl_cnt <= ACL_MAX_ENTRIES"));
+
+ /*
+ * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt
+ *
+ * 3.16.6.1. Recomputing mode upon SETATTR of ACL
+ */
+
+ for (i = 0; i < aclp->acl_cnt; i++) {
+ entry = &(aclp->acl_entry[i]);
+
+ if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW &&
+ entry->ae_entry_type != ACL_ENTRY_TYPE_DENY)
+ continue;
+
+ if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY)
+ continue;
+
+ if (entry->ae_tag == ACL_USER_OBJ) {
+ if ((entry->ae_perm & ACL_READ_DATA) &&
+ ((seen & S_IRUSR) == 0)) {
+ seen |= S_IRUSR;
+ if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
+ mode |= S_IRUSR;
+ }
+ if ((entry->ae_perm & ACL_WRITE_DATA) &&
+ ((seen & S_IWUSR) == 0)) {
+ seen |= S_IWUSR;
+ if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
+ mode |= S_IWUSR;
+ }
+ if ((entry->ae_perm & ACL_EXECUTE) &&
+ ((seen & S_IXUSR) == 0)) {
+ seen |= S_IXUSR;
+ if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
+ mode |= S_IXUSR;
+ }
+ } else if (entry->ae_tag == ACL_GROUP_OBJ) {
+ if ((entry->ae_perm & ACL_READ_DATA) &&
+ ((seen & S_IRGRP) == 0)) {
+ seen |= S_IRGRP;
+ if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
+ mode |= S_IRGRP;
+ }
+ if ((entry->ae_perm & ACL_WRITE_DATA) &&
+ ((seen & S_IWGRP) == 0)) {
+ seen |= S_IWGRP;
+ if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
+ mode |= S_IWGRP;
+ }
+ if ((entry->ae_perm & ACL_EXECUTE) &&
+ ((seen & S_IXGRP) == 0)) {
+ seen |= S_IXGRP;
+ if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
+ mode |= S_IXGRP;
+ }
+ } else if (entry->ae_tag == ACL_EVERYONE) {
+ if (entry->ae_perm & ACL_READ_DATA) {
+ if ((seen & S_IRUSR) == 0) {
+ seen |= S_IRUSR;
+ if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
+ mode |= S_IRUSR;
+ }
+ if ((seen & S_IRGRP) == 0) {
+ seen |= S_IRGRP;
+ if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
+ mode |= S_IRGRP;
+ }
+ if ((seen & S_IROTH) == 0) {
+ seen |= S_IROTH;
+ if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
+ mode |= S_IROTH;
+ }
+ }
+ if (entry->ae_perm & ACL_WRITE_DATA) {
+ if ((seen & S_IWUSR) == 0) {
+ seen |= S_IWUSR;
+ if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
+ mode |= S_IWUSR;
+ }
+ if ((seen & S_IWGRP) == 0) {
+ seen |= S_IWGRP;
+ if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
+ mode |= S_IWGRP;
+ }
+ if ((seen & S_IWOTH) == 0) {
+ seen |= S_IWOTH;
+ if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
+ mode |= S_IWOTH;
+ }
+ }
+ if (entry->ae_perm & ACL_EXECUTE) {
+ if ((seen & S_IXUSR) == 0) {
+ seen |= S_IXUSR;
+ if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
+ mode |= S_IXUSR;
+ }
+ if ((seen & S_IXGRP) == 0) {
+ seen |= S_IXGRP;
+ if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
+ mode |= S_IXGRP;
+ }
+ if ((seen & S_IXOTH) == 0) {
+ seen |= S_IXOTH;
+ if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
+ mode |= S_IXOTH;
+ }
+ }
+ }
+ }
+
+ *_mode = mode | (old_mode & ACL_PRESERVE_MASK);
+}
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