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cifs: Override unmappable incoming uids and gids

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The cifs protocol has a 64bit space for uids and gids, while linux
only supports a 32bit space today.  Instead of silently truncating
64bit cifs ids, replace cifs ids that do not fit in the 32bit linux
id space with the default uid and gids for the cifs mount.

Cc: Steve French <smfrench@gmail.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman
2013-02-05 23:55:44 -08:00
förälder c9617a44b3
incheckning 46bbc25f9f
1 ändrade filer med 13 tillägg och 9 borttagningar
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22
fs/cifs/inode.c
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@@ -244,15 +244,19 @@ cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info,
break;
}
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
fattr->cf_uid = cifs_sb->mnt_uid;
else
fattr->cf_uid = le64_to_cpu(info->Uid);
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
fattr->cf_gid = cifs_sb->mnt_gid;
else
fattr->cf_gid = le64_to_cpu(info->Gid);
fattr->cf_uid = cifs_sb->mnt_uid;
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)) {
u64 id = le64_to_cpu(info->Uid);
if (id < ((uid_t)-1))
fattr->cf_uid = id;
}
fattr->cf_gid = cifs_sb->mnt_gid;
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)) {
u64 id = le64_to_cpu(info->Gid);
if (id < ((gid_t)-1))
fattr->cf_gid = id;
}
fattr->cf_nlink = le64_to_cpu(info->Nlinks);
}