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userns: Convert the audit loginuid to be a kuid

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Always store audit loginuids in type kuid_t.

Print loginuids by converting them into uids in the appropriate user
namespace, and then printing the resulting uid.

Modify audit_get_loginuid to return a kuid_t.

Modify audit_set_loginuid to take a kuid_t.

Modify /proc/<pid>/loginuid on read to convert the loginuid into the
user namespace of the opener of the file.

Modify /proc/<pid>/loginud on write to convert the loginuid
rom the user namespace of the opener of the file.

Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Eric Paris <eparis@redhat.com>
Cc: Paul Moore <paul@paul-moore.com> ?
Cc: David Miller <davem@davemloft.net>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2012-09-10 22:39:43 -07:00
parent ca57ec0f00
commit e1760bd5ff
18 changed files with 80 additions and 66 deletions
Download patch file Download diff file Expand all files Collapse all files

20
kernel/auditsc.c
View file

@ -149,7 +149,7 @@ struct audit_aux_data_execve {
struct audit_aux_data_pids {
struct audit_aux_data d;
pid_t target_pid[AUDIT_AUX_PIDS];
uid_t target_auid[AUDIT_AUX_PIDS];
kuid_t target_auid[AUDIT_AUX_PIDS];
uid_t target_uid[AUDIT_AUX_PIDS];
unsigned int target_sessionid[AUDIT_AUX_PIDS];
u32 target_sid[AUDIT_AUX_PIDS];
@ -214,7 +214,7 @@ struct audit_context {
int arch;
pid_t target_pid;
uid_t target_auid;
kuid_t target_auid;
uid_t target_uid;
unsigned int target_sessionid;
u32 target_sid;
@ -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,
uid_t auid, uid_t uid, unsigned int sessionid,
kuid_t auid, uid_t uid, unsigned int sessionid,
u32 sid, char *comm)
{
struct audit_buffer *ab;
@ -1188,7 +1188,8 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid,
if (!ab)
return rc;
audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid, auid,
audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid,
from_kuid(&init_user_ns, auid),
uid, sessionid);
if (security_secid_to_secctx(sid, &ctx, &len)) {
audit_log_format(ab, " obj=(none)");
@ -1630,7 +1631,7 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
context->name_count,
context->ppid,
context->pid,
tsk->loginuid,
from_kuid(&init_user_ns, tsk->loginuid),
context->uid,
context->gid,
context->euid, context->suid, context->fsuid,
@ -2291,14 +2292,14 @@ static atomic_t session_id = ATOMIC_INIT(0);
*
* Called (set) from fs/proc/base.c::proc_loginuid_write().
*/
int audit_set_loginuid(uid_t loginuid)
int audit_set_loginuid(kuid_t loginuid)
{
struct task_struct *task = current;
struct audit_context *context = task->audit_context;
unsigned int sessionid;
#ifdef CONFIG_AUDIT_LOGINUID_IMMUTABLE
if (task->loginuid != -1)
if (uid_valid(task->loginuid))
return -EPERM;
#else /* CONFIG_AUDIT_LOGINUID_IMMUTABLE */
if (!capable(CAP_AUDIT_CONTROL))
@ -2315,7 +2316,8 @@ int audit_set_loginuid(uid_t loginuid)
"old auid=%u new auid=%u"
" old ses=%u new ses=%u",
task->pid, task_uid(task),
task->loginuid, loginuid,
from_kuid(&init_user_ns, task->loginuid),
from_kuid(&init_user_ns, loginuid),
task->sessionid, sessionid);
audit_log_end(ab);
}
@ -2543,7 +2545,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
if (audit_pid && t->tgid == audit_pid) {
if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1 || sig == SIGUSR2) {
audit_sig_pid = tsk->pid;
if (tsk->loginuid != -1)
if (uid_valid(tsk->loginuid))
audit_sig_uid = tsk->loginuid;
else
audit_sig_uid = uid;