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umd: Remove exit_umh

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The bpfilter code no longer uses the umd_info.cleanup callback.  This
callback is what exit_umh exists to call.  So remove exit_umh and all
of it's associated booking.

v1: https://lkml.kernel.org/r/87bll6dlte.fsf_-_@x220.int.ebiederm.org
v2: https://lkml.kernel.org/r/87y2o53abg.fsf_-_@x220.int.ebiederm.org
Link: https://lkml.kernel.org/r/20200702164140.4468-15-ebiederm@xmission.com
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Tested-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2020-06-25 17:40:40 -05:00
parent e80eb1dc86
commit 8c2f526639
4 changed files with 0 additions and 48 deletions
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1
include/linux/sched.h
View File

@ -1511,7 +1511,6 @@ extern struct pid *cad_pid;
#define PF_KTHREAD 0x00200000 /* I am a kernel thread */
#define PF_RANDOMIZE 0x00400000 /* Randomize virtual address space */
#define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
#define PF_UMH 0x02000000 /* I'm an Usermodehelper process */
#define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_mask */
#define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
#define PF_MEMALLOC_NOCMA 0x10000000 /* All allocation request will have _GFP_MOVABLE cleared */

16
include/linux/usermode_driver.h
View File

@ -4,26 +4,10 @@
#include <linux/umh.h>
#include <linux/path.h>
#ifdef CONFIG_BPFILTER
void __exit_umh(struct task_struct *tsk);
static inline void exit_umh(struct task_struct *tsk)
{
if (unlikely(tsk->flags & PF_UMH))
__exit_umh(tsk);
}
#else
static inline void exit_umh(struct task_struct *tsk)
{
}
#endif
struct umd_info {
const char *driver_name;
struct file *pipe_to_umh;
struct file *pipe_from_umh;
struct list_head list;
void (*cleanup)(struct umd_info *info);
struct path wd;
struct pid *tgid;
};

3
kernel/exit.c
View File

@ -63,7 +63,6 @@
#include <linux/random.h>
#include <linux/rcuwait.h>
#include <linux/compat.h>
#include <linux/usermode_driver.h>
#include <linux/uaccess.h>
#include <asm/unistd.h>
@ -805,8 +804,6 @@ void __noreturn do_exit(long code)
exit_task_namespaces(tsk);
exit_task_work(tsk);
exit_thread(tsk);
if (group_dead)
exit_umh(tsk);
/*
* Flush inherited counters to the parent - before the parent

28
kernel/usermode_driver.c
View File

@ -9,9 +9,6 @@
#include <linux/task_work.h>
#include <linux/usermode_driver.h>
static LIST_HEAD(umh_list);
static DEFINE_MUTEX(umh_list_lock);
static struct vfsmount *blob_to_mnt(const void *data, size_t len, const char *name)
{
struct file_system_type *type;
@ -134,7 +131,6 @@ static int umd_setup(struct subprocess_info *info, struct cred *new)
umd_info->pipe_to_umh = to_umh[1];
umd_info->pipe_from_umh = from_umh[0];
umd_info->tgid = get_pid(task_tgid(current));
current->flags |= PF_UMH;
return 0;
}
@ -182,11 +178,6 @@ int fork_usermode_driver(struct umd_info *info)
goto out;
err = call_usermodehelper_exec(sub_info, UMH_WAIT_EXEC);
if (!err) {
mutex_lock(&umh_list_lock);
list_add(&info->list, &umh_list);
mutex_unlock(&umh_list_lock);
}
out:
if (argv)
argv_free(argv);
@ -194,23 +185,4 @@ int fork_usermode_driver(struct umd_info *info)
}
EXPORT_SYMBOL_GPL(fork_usermode_driver);
void __exit_umh(struct task_struct *tsk)
{
struct umd_info *info;
struct pid *tgid = task_tgid(tsk);
mutex_lock(&umh_list_lock);
list_for_each_entry(info, &umh_list, list) {
if (info->tgid == tgid) {
list_del(&info->list);
mutex_unlock(&umh_list_lock);
goto out;
}
}
mutex_unlock(&umh_list_lock);
return;
out:
if (info->cleanup)
info->cleanup(info);
}