#include <linux/unistd.h>
#include <linux/kmod.h>
#include <linux/slab.h>
-#include <linux/mnt_namespace.h>
#include <linux/completion.h>
#include <linux/file.h>
#include <linux/fdtable.h>
#include <linux/suspend.h>
#include <asm/uaccess.h>
+#include <trace/events/module.h>
+
extern int max_threads;
static struct workqueue_struct *khelper_wq;
char modprobe_path[KMOD_PATH_LEN] = "/sbin/modprobe";
/**
- * request_module - try to load a kernel module
- * @fmt: printf style format string for the name of the module
- * @varargs: arguements as specified in the format string
+ * __request_module - try to load a kernel module
+ * @wait: wait (or not) for the operation to complete
+ * @fmt: printf style format string for the name of the module
+ * @...: arguments as specified in the format string
*
* Load a module using the user mode module loader. The function returns
* zero on success or a negative errno code on failure. Note that a
* If module auto-loading support is disabled then this function
* becomes a no-operation.
*/
-int request_module(const char *fmt, ...)
+int __request_module(bool wait, const char *fmt, ...)
{
va_list args;
char module_name[MODULE_NAME_LEN];
if (ret >= MODULE_NAME_LEN)
return -ENAMETOOLONG;
+ ret = security_kernel_module_request(module_name);
+ if (ret)
+ return ret;
+
/* If modprobe needs a service that is in a module, we get a recursive
* loop. Limit the number of running kmod threads to max_threads/2 or
* MAX_KMOD_CONCURRENT, whichever is the smaller. A cleaner method
return -ENOMEM;
}
- ret = call_usermodehelper(modprobe_path, argv, envp, 1);
+ trace_module_request(module_name, wait, _RET_IP_);
+
+ ret = call_usermodehelper(modprobe_path, argv, envp,
+ wait ? UMH_WAIT_PROC : UMH_WAIT_EXEC);
atomic_dec(&kmod_concurrent);
return ret;
}
-EXPORT_SYMBOL(request_module);
-#endif /* CONFIG_KMOD */
+EXPORT_SYMBOL(__request_module);
+#endif /* CONFIG_MODULES */
struct subprocess_info {
struct work_struct work;
struct completion *complete;
+ struct cred *cred;
char *path;
char **argv;
char **envp;
- struct key *ring;
enum umh_wait wait;
int retval;
struct file *stdin;
static int ____call_usermodehelper(void *data)
{
struct subprocess_info *sub_info = data;
- struct key *new_session, *old_session;
int retval;
- /* Unblock all signals and set the session keyring. */
- new_session = key_get(sub_info->ring);
+ BUG_ON(atomic_read(&sub_info->cred->usage) != 1);
+
+ /* Unblock all signals */
spin_lock_irq(¤t->sighand->siglock);
- old_session = __install_session_keyring(current, new_session);
flush_signal_handlers(current, 1);
sigemptyset(¤t->blocked);
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
- key_put(old_session);
+ /* Install the credentials */
+ commit_creds(sub_info->cred);
+ sub_info->cred = NULL;
/* Install input pipe when needed */
if (sub_info->stdin) {
}
/* We can run anywhere, unlike our parent keventd(). */
- set_cpus_allowed_ptr(current, CPU_MASK_ALL_PTR);
+ set_cpus_allowed_ptr(current, cpu_all_mask);
/*
* Our parent is keventd, which runs with elevated scheduling priority.
{
if (info->cleanup)
(*info->cleanup)(info->argv, info->envp);
+ if (info->cred)
+ put_cred(info->cred);
kfree(info);
}
EXPORT_SYMBOL(call_usermodehelper_freeinfo);
pid_t pid;
enum umh_wait wait = sub_info->wait;
+ BUG_ON(atomic_read(&sub_info->cred->usage) != 1);
+
/* CLONE_VFORK: wait until the usermode helper has execve'd
* successfully We need the data structures to stay around
* until that is done. */
sub_info->path = path;
sub_info->argv = argv;
sub_info->envp = envp;
+ sub_info->cred = prepare_usermodehelper_creds();
+ if (!sub_info->cred) {
+ kfree(sub_info);
+ return NULL;
+ }
out:
return sub_info;
void call_usermodehelper_setkeys(struct subprocess_info *info,
struct key *session_keyring)
{
- info->ring = session_keyring;
+#ifdef CONFIG_KEYS
+ struct thread_group_cred *tgcred = info->cred->tgcred;
+ key_put(tgcred->session_keyring);
+ tgcred->session_keyring = key_get(session_keyring);
+#else
+ BUG();
+#endif
}
EXPORT_SYMBOL(call_usermodehelper_setkeys);
DECLARE_COMPLETION_ONSTACK(done);
int retval = 0;
+ BUG_ON(atomic_read(&sub_info->cred->usage) != 1);
+ validate_creds(sub_info->cred);
+
helper_lock();
if (sub_info->path[0] == '\0')
goto out;
return -ENOMEM;
ret = call_usermodehelper_stdinpipe(sub_info, filp);
- if (ret < 0)
- goto out;
+ if (ret < 0) {
+ call_usermodehelper_freeinfo(sub_info);
+ return ret;
+ }
- return call_usermodehelper_exec(sub_info, UMH_WAIT_EXEC);
+ ret = call_usermodehelper_exec(sub_info, UMH_WAIT_EXEC);
+ if (ret < 0) /* Failed to execute helper, close pipe */
+ filp_close(*filp, NULL);
- out:
- call_usermodehelper_freeinfo(sub_info);
return ret;
}
EXPORT_SYMBOL(call_usermodehelper_pipe);