cifs: Override unmappable incoming uids and gids (46bbc25f) · Commits · 戴 / test

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>

fs/cifs/inode.c

+13 −9

Original line number	Diff line number	Diff line
		@@ -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_UID)) {
		u64 id = le64_to_cpu(info->Uid);
		if (id < ((uid_t)-1))
		fattr->cf_uid = id;
		}

		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);
		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);
		}

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