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84969465dd
When new directory 'DIR1' is created in a directory 'DIR0' with SGID bit
set, DIR1 is expected to have SGID bit set (and owning group equal to
the owning group of 'DIR0'). However when 'DIR0' also has some default
ACLs that 'DIR1' inherits, setting these ACLs will result in SGID bit on
'DIR1' to get cleared if user is not member of the owning group.
Fix the problem by creating __hfsplus_set_posix_acl() function that does
not call posix_acl_update_mode() and use it when inheriting ACLs. That
prevents SGID bit clearing and the mode has been properly set by
posix_acl_create() anyway.
Fixes: 073931017b
CC: stable@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
144 lines
3.0 KiB
C
144 lines
3.0 KiB
C
/*
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* linux/fs/hfsplus/posix_acl.c
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*
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* Vyacheslav Dubeyko <slava@dubeyko.com>
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*
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* Handler for Posix Access Control Lists (ACLs) support.
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*/
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#include "hfsplus_fs.h"
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#include "xattr.h"
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#include "acl.h"
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struct posix_acl *hfsplus_get_posix_acl(struct inode *inode, int type)
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{
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struct posix_acl *acl;
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char *xattr_name;
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char *value = NULL;
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ssize_t size;
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hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino);
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switch (type) {
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case ACL_TYPE_ACCESS:
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xattr_name = XATTR_NAME_POSIX_ACL_ACCESS;
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break;
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case ACL_TYPE_DEFAULT:
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xattr_name = XATTR_NAME_POSIX_ACL_DEFAULT;
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break;
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default:
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return ERR_PTR(-EINVAL);
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}
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size = __hfsplus_getxattr(inode, xattr_name, NULL, 0);
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if (size > 0) {
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value = (char *)hfsplus_alloc_attr_entry();
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if (unlikely(!value))
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return ERR_PTR(-ENOMEM);
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size = __hfsplus_getxattr(inode, xattr_name, value, size);
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}
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if (size > 0)
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acl = posix_acl_from_xattr(&init_user_ns, value, size);
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else if (size == -ENODATA)
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acl = NULL;
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else
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acl = ERR_PTR(size);
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hfsplus_destroy_attr_entry((hfsplus_attr_entry *)value);
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return acl;
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}
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static int __hfsplus_set_posix_acl(struct inode *inode, struct posix_acl *acl,
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int type)
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{
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int err;
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char *xattr_name;
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size_t size = 0;
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char *value = NULL;
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hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino);
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switch (type) {
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case ACL_TYPE_ACCESS:
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xattr_name = XATTR_NAME_POSIX_ACL_ACCESS;
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break;
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case ACL_TYPE_DEFAULT:
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xattr_name = XATTR_NAME_POSIX_ACL_DEFAULT;
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if (!S_ISDIR(inode->i_mode))
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return acl ? -EACCES : 0;
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break;
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default:
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return -EINVAL;
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}
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if (acl) {
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size = posix_acl_xattr_size(acl->a_count);
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if (unlikely(size > HFSPLUS_MAX_INLINE_DATA_SIZE))
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return -ENOMEM;
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value = (char *)hfsplus_alloc_attr_entry();
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if (unlikely(!value))
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return -ENOMEM;
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err = posix_acl_to_xattr(&init_user_ns, acl, value, size);
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if (unlikely(err < 0))
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goto end_set_acl;
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}
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err = __hfsplus_setxattr(inode, xattr_name, value, size, 0);
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end_set_acl:
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hfsplus_destroy_attr_entry((hfsplus_attr_entry *)value);
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if (!err)
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set_cached_acl(inode, type, acl);
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return err;
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}
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int hfsplus_set_posix_acl(struct inode *inode, struct posix_acl *acl, int type)
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{
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int err;
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if (type == ACL_TYPE_ACCESS && acl) {
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err = posix_acl_update_mode(inode, &inode->i_mode, &acl);
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if (err)
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return err;
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}
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return __hfsplus_set_posix_acl(inode, acl, type);
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}
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int hfsplus_init_posix_acl(struct inode *inode, struct inode *dir)
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{
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int err = 0;
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struct posix_acl *default_acl, *acl;
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hfs_dbg(ACL_MOD,
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"[%s]: ino %lu, dir->ino %lu\n",
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__func__, inode->i_ino, dir->i_ino);
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if (S_ISLNK(inode->i_mode))
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return 0;
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err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
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if (err)
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return err;
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if (default_acl) {
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err = __hfsplus_set_posix_acl(inode, default_acl,
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ACL_TYPE_DEFAULT);
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posix_acl_release(default_acl);
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}
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if (acl) {
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if (!err)
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err = __hfsplus_set_posix_acl(inode, acl,
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ACL_TYPE_ACCESS);
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posix_acl_release(acl);
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}
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return err;
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}
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