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userns: Convert audit to work with user namespaces enabled
- Explicitly format uids gids in audit messges in the initial user namespace. This is safe because auditd is restrected to be in the initial user namespace. - Convert audit_sig_uid into a kuid_t. - Enable building the audit code and user namespaces at the same time. The net result is that the audit subsystem now uses kuid_t and kgid_t whenever possible making it almost impossible to confuse a raw uid_t with a kuid_t preventing bugs. Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Eric Paris <eparis@redhat.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman
parent
e1760bd5ff
commit
cca080d9b6
@ -69,11 +69,12 @@ static void tty_audit_log(const char *description, struct task_struct *tsk,
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ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_TTY);
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if (ab) {
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char name[sizeof(tsk->comm)];
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uid_t uid = task_uid(tsk);
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kuid_t uid = task_uid(tsk);
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audit_log_format(ab, "%s pid=%u uid=%u auid=%u ses=%u "
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"major=%d minor=%d comm=", description,
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tsk->pid, uid,
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tsk->pid,
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from_kuid(&init_user_ns, uid),
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from_kuid(&init_user_ns, loginuid),
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sessionid,
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major, minor);
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@ -927,8 +927,6 @@ config UIDGID_CONVERTED
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# Features
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depends on IMA = n
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depends on EVM = n
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depends on AUDIT = n
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depends on AUDITSYSCALL = n
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depends on TASKSTATS = n
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depends on TRACING = n
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depends on FS_POSIX_ACL = n
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@ -105,7 +105,7 @@ static int audit_backlog_wait_time = 60 * HZ;
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static int audit_backlog_wait_overflow = 0;
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/* The identity of the user shutting down the audit system. */
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uid_t audit_sig_uid = -1;
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kuid_t audit_sig_uid = INVALID_UID;
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pid_t audit_sig_pid = -1;
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u32 audit_sig_sid = 0;
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@ -853,7 +853,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
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security_release_secctx(ctx, len);
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return -ENOMEM;
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}
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sig_data->uid = audit_sig_uid;
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sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid);
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sig_data->pid = audit_sig_pid;
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if (audit_sig_sid) {
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memcpy(sig_data->ctx, ctx, len);
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@ -146,7 +146,7 @@ extern void audit_kill_trees(struct list_head *);
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extern char *audit_unpack_string(void **, size_t *, size_t);
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extern pid_t audit_sig_pid;
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extern uid_t audit_sig_uid;
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extern kuid_t audit_sig_uid;
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extern u32 audit_sig_sid;
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#ifdef CONFIG_AUDITSYSCALL
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@ -150,7 +150,7 @@ struct audit_aux_data_pids {
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struct audit_aux_data d;
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pid_t target_pid[AUDIT_AUX_PIDS];
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kuid_t target_auid[AUDIT_AUX_PIDS];
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uid_t target_uid[AUDIT_AUX_PIDS];
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kuid_t target_uid[AUDIT_AUX_PIDS];
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unsigned int target_sessionid[AUDIT_AUX_PIDS];
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u32 target_sid[AUDIT_AUX_PIDS];
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char target_comm[AUDIT_AUX_PIDS][TASK_COMM_LEN];
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@ -208,14 +208,14 @@ struct audit_context {
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size_t sockaddr_len;
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/* Save things to print about task_struct */
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pid_t pid, ppid;
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uid_t uid, euid, suid, fsuid;
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gid_t gid, egid, sgid, fsgid;
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kuid_t uid, euid, suid, fsuid;
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kgid_t gid, egid, sgid, fsgid;
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unsigned long personality;
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int arch;
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pid_t target_pid;
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kuid_t target_auid;
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uid_t target_uid;
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kuid_t target_uid;
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unsigned int target_sessionid;
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u32 target_sid;
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char target_comm[TASK_COMM_LEN];
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@ -231,8 +231,8 @@ struct audit_context {
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long args[6];
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} socketcall;
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struct {
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uid_t uid;
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gid_t gid;
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kuid_t uid;
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kgid_t gid;
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umode_t mode;
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u32 osid;
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int has_perm;
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@ -1176,7 +1176,7 @@ static void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk
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}
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static int audit_log_pid_context(struct audit_context *context, pid_t pid,
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kuid_t auid, uid_t uid, unsigned int sessionid,
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kuid_t auid, kuid_t uid, unsigned int sessionid,
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u32 sid, char *comm)
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{
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struct audit_buffer *ab;
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@ -1190,7 +1190,7 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid,
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audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid,
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from_kuid(&init_user_ns, auid),
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uid, sessionid);
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from_kuid(&init_user_ns, uid), sessionid);
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if (security_secid_to_secctx(sid, &ctx, &len)) {
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audit_log_format(ab, " obj=(none)");
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rc = 1;
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@ -1440,7 +1440,9 @@ static void show_special(struct audit_context *context, int *call_panic)
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u32 osid = context->ipc.osid;
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audit_log_format(ab, "ouid=%u ogid=%u mode=%#ho",
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context->ipc.uid, context->ipc.gid, context->ipc.mode);
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from_kuid(&init_user_ns, context->ipc.uid),
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from_kgid(&init_user_ns, context->ipc.gid),
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context->ipc.mode);
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if (osid) {
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char *ctx = NULL;
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u32 len;
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@ -1553,8 +1555,8 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n,
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MAJOR(n->dev),
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MINOR(n->dev),
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n->mode,
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n->uid,
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n->gid,
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from_kuid(&init_user_ns, n->uid),
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from_kgid(&init_user_ns, n->gid),
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MAJOR(n->rdev),
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MINOR(n->rdev));
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}
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@ -1632,10 +1634,15 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
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context->ppid,
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context->pid,
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from_kuid(&init_user_ns, tsk->loginuid),
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context->uid,
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context->gid,
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context->euid, context->suid, context->fsuid,
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context->egid, context->sgid, context->fsgid, tty,
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from_kuid(&init_user_ns, context->uid),
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from_kgid(&init_user_ns, context->gid),
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from_kuid(&init_user_ns, context->euid),
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from_kuid(&init_user_ns, context->suid),
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from_kuid(&init_user_ns, context->fsuid),
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from_kgid(&init_user_ns, context->egid),
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from_kgid(&init_user_ns, context->sgid),
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from_kgid(&init_user_ns, context->fsgid),
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tty,
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tsk->sessionid);
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@ -2315,7 +2322,8 @@ int audit_set_loginuid(kuid_t loginuid)
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audit_log_format(ab, "login pid=%d uid=%u "
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"old auid=%u new auid=%u"
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" old ses=%u new ses=%u",
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task->pid, task_uid(task),
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task->pid,
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from_kuid(&init_user_ns, task_uid(task)),
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from_kuid(&init_user_ns, task->loginuid),
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from_kuid(&init_user_ns, loginuid),
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task->sessionid, sessionid);
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@ -2540,7 +2548,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
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struct audit_aux_data_pids *axp;
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struct task_struct *tsk = current;
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struct audit_context *ctx = tsk->audit_context;
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uid_t uid = current_uid(), t_uid = task_uid(t);
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kuid_t uid = current_uid(), t_uid = task_uid(t);
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if (audit_pid && t->tgid == audit_pid) {
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if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1 || sig == SIGUSR2) {
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@ -2666,8 +2674,8 @@ void __audit_mmap_fd(int fd, int flags)
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static void audit_log_abend(struct audit_buffer *ab, char *reason, long signr)
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{
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uid_t auid, uid;
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gid_t gid;
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kuid_t auid, uid;
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kgid_t gid;
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unsigned int sessionid;
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auid = audit_get_loginuid(current);
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@ -2675,7 +2683,10 @@ static void audit_log_abend(struct audit_buffer *ab, char *reason, long signr)
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current_uid_gid(&uid, &gid);
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audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u",
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auid, uid, gid, sessionid);
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from_kuid(&init_user_ns, auid),
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from_kuid(&init_user_ns, uid),
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from_kgid(&init_user_ns, gid),
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sessionid);
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audit_log_task_context(ab);
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audit_log_format(ab, " pid=%d comm=", current->pid);
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audit_log_untrustedstring(ab, current->comm);
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