Commit cca080d9 authored by Eric W. Biederman's avatar Eric W. Biederman

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 <>
Cc: Eric Paris <>
Cc: Greg Kroah-Hartman <>
Signed-off-by: default avatarEric W. Biederman <>
parent e1760bd5
......@@ -69,11 +69,12 @@ static void tty_audit_log(const char *description, struct task_struct *tsk,
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_TTY);
if (ab) {
char name[sizeof(tsk->comm)];
uid_t uid = task_uid(tsk);
kuid_t uid = task_uid(tsk);
audit_log_format(ab, "%s pid=%u uid=%u auid=%u ses=%u "
"major=%d minor=%d comm=", description,
tsk->pid, uid,
from_kuid(&init_user_ns, uid),
from_kuid(&init_user_ns, loginuid),
major, minor);
......@@ -927,8 +927,6 @@ config UIDGID_CONVERTED
# Features
depends on IMA = n
depends on EVM = n
depends on AUDIT = n
depends on AUDITSYSCALL = n
depends on TASKSTATS = n
depends on TRACING = n
depends on FS_POSIX_ACL = n
......@@ -105,7 +105,7 @@ static int audit_backlog_wait_time = 60 * HZ;
static int audit_backlog_wait_overflow = 0;
/* The identity of the user shutting down the audit system. */
uid_t audit_sig_uid = -1;
kuid_t audit_sig_uid = INVALID_UID;
pid_t audit_sig_pid = -1;
u32 audit_sig_sid = 0;
......@@ -853,7 +853,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
security_release_secctx(ctx, len);
return -ENOMEM;
sig_data->uid = audit_sig_uid;
sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid);
sig_data->pid = audit_sig_pid;
if (audit_sig_sid) {
memcpy(sig_data->ctx, ctx, len);
......@@ -146,7 +146,7 @@ extern void audit_kill_trees(struct list_head *);
extern char *audit_unpack_string(void **, size_t *, size_t);
extern pid_t audit_sig_pid;
extern uid_t audit_sig_uid;
extern kuid_t audit_sig_uid;
extern u32 audit_sig_sid;
......@@ -150,7 +150,7 @@ struct audit_aux_data_pids {
struct audit_aux_data d;
pid_t target_pid[AUDIT_AUX_PIDS];
kuid_t target_auid[AUDIT_AUX_PIDS];
uid_t target_uid[AUDIT_AUX_PIDS];
kuid_t target_uid[AUDIT_AUX_PIDS];
unsigned int target_sessionid[AUDIT_AUX_PIDS];
u32 target_sid[AUDIT_AUX_PIDS];
char target_comm[AUDIT_AUX_PIDS][TASK_COMM_LEN];
......@@ -208,14 +208,14 @@ struct audit_context {
size_t sockaddr_len;
/* Save things to print about task_struct */
pid_t pid, ppid;
uid_t uid, euid, suid, fsuid;
gid_t gid, egid, sgid, fsgid;
kuid_t uid, euid, suid, fsuid;
kgid_t gid, egid, sgid, fsgid;
unsigned long personality;
int arch;
pid_t target_pid;
kuid_t target_auid;
uid_t target_uid;
kuid_t target_uid;
unsigned int target_sessionid;
u32 target_sid;
char target_comm[TASK_COMM_LEN];
......@@ -231,8 +231,8 @@ struct audit_context {
long args[6];
} socketcall;
struct {
uid_t uid;
gid_t gid;
kuid_t uid;
kgid_t gid;
umode_t mode;
u32 osid;
int has_perm;
......@@ -1176,7 +1176,7 @@ static void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk
static int audit_log_pid_context(struct audit_context *context, pid_t pid,
kuid_t auid, uid_t uid, unsigned int sessionid,
kuid_t auid, kuid_t uid, unsigned int sessionid,
u32 sid, char *comm)
struct audit_buffer *ab;
......@@ -1190,7 +1190,7 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid,
audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid,
from_kuid(&init_user_ns, auid),
uid, sessionid);
from_kuid(&init_user_ns, uid), sessionid);
if (security_secid_to_secctx(sid, &ctx, &len)) {
audit_log_format(ab, " obj=(none)");
rc = 1;
......@@ -1440,7 +1440,9 @@ static void show_special(struct audit_context *context, int *call_panic)
u32 osid = context->ipc.osid;
audit_log_format(ab, "ouid=%u ogid=%u mode=%#ho",
context->ipc.uid, context->ipc.gid, context->ipc.mode);
from_kuid(&init_user_ns, context->ipc.uid),
from_kgid(&init_user_ns, context->ipc.gid),
if (osid) {
char *ctx = NULL;
u32 len;
......@@ -1553,8 +1555,8 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n,
from_kuid(&init_user_ns, n->uid),
from_kgid(&init_user_ns, n->gid),
......@@ -1632,10 +1634,15 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
from_kuid(&init_user_ns, tsk->loginuid),
context->euid, context->suid, context->fsuid,
context->egid, context->sgid, context->fsgid, tty,
from_kuid(&init_user_ns, context->uid),
from_kgid(&init_user_ns, context->gid),
from_kuid(&init_user_ns, context->euid),
from_kuid(&init_user_ns, context->suid),
from_kuid(&init_user_ns, context->fsuid),
from_kgid(&init_user_ns, context->egid),
from_kgid(&init_user_ns, context->sgid),
from_kgid(&init_user_ns, context->fsgid),
......@@ -2315,7 +2322,8 @@ int audit_set_loginuid(kuid_t loginuid)
audit_log_format(ab, "login pid=%d uid=%u "
"old auid=%u new auid=%u"
" old ses=%u new ses=%u",
task->pid, task_uid(task),
from_kuid(&init_user_ns, task_uid(task)),
from_kuid(&init_user_ns, task->loginuid),
from_kuid(&init_user_ns, loginuid),
task->sessionid, sessionid);
......@@ -2540,7 +2548,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
struct audit_aux_data_pids *axp;
struct task_struct *tsk = current;
struct audit_context *ctx = tsk->audit_context;
uid_t uid = current_uid(), t_uid = task_uid(t);
kuid_t uid = current_uid(), t_uid = task_uid(t);
if (audit_pid && t->tgid == audit_pid) {
if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1 || sig == SIGUSR2) {
......@@ -2666,8 +2674,8 @@ void __audit_mmap_fd(int fd, int flags)
static void audit_log_abend(struct audit_buffer *ab, char *reason, long signr)
uid_t auid, uid;
gid_t gid;
kuid_t auid, uid;
kgid_t gid;
unsigned int sessionid;
auid = audit_get_loginuid(current);
......@@ -2675,7 +2683,10 @@ static void audit_log_abend(struct audit_buffer *ab, char *reason, long signr)
current_uid_gid(&uid, &gid);
audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u",
auid, uid, gid, sessionid);
from_kuid(&init_user_ns, auid),
from_kuid(&init_user_ns, uid),
from_kgid(&init_user_ns, gid),
audit_log_format(ab, " pid=%d comm=", current->pid);
audit_log_untrustedstring(ab, current->comm);
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