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umh: Separate the user mode driver and the user mode helper support

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This makes it clear which code is part of the core user mode
helper support and which code is needed to implement user mode
drivers.

This makes the kernel smaller for everyone who does not use a usermode
driver.

v1: https://lkml.kernel.org/r/87tuyyf0ln.fsf_-_@x220.int.ebiederm.org
v2: https://lkml.kernel.org/r/87imf963s6.fsf_-_@x220.int.ebiederm.org
Link: https://lkml.kernel.org/r/20200702164140.4468-5-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
2020-06-26 12:23:00 -05:00
parent 21d5982806
commit 884c5e683b
8 changed files with 179 additions and 158 deletions
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30
include/linux/usermode_driver.h Normal file
View File

@@ -0,0 +1,30 @@
#ifndef __LINUX_USERMODE_DRIVER_H__
#define __LINUX_USERMODE_DRIVER_H__
#include <linux/umh.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 umh_info {
const char *cmdline;
struct file *pipe_to_umh;
struct file *pipe_from_umh;
struct list_head list;
void (*cleanup)(struct umh_info *info);
pid_t pid;
};
int fork_usermode_blob(void *data, size_t len, struct umh_info *info);
#endif /* __LINUX_USERMODE_DRIVER_H__ */