Commit 9c930054 authored by Xie Yongji's avatar Xie Yongji Committed by Michael S. Tsirkin
Browse files

file: Export receive_fd() to modules 



Export receive_fd() so that some modules can use
it to pass file descriptor between processes without
missing any security stuffs.

Signed-off-by: default avatarXie Yongji <xieyongji@bytedance.com>
Acked-by: default avatarJason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20210831103634.33-4-xieyongji@bytedance.com


Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent 7a6b92d3

fs/file.c

+6 −0
Original line number Diff line number Diff line
@@ -1134,6 +1134,12 @@ int receive_fd_replace(int new_fd, struct file *file, unsigned int o_flags) 
	return new_fd;

}



int receive_fd(struct file *file, unsigned int o_flags)

{

	return __receive_fd(file, NULL, o_flags);

}

EXPORT_SYMBOL_GPL(receive_fd);



static int ksys_dup3(unsigned int oldfd, unsigned int newfd, int flags)

{

	int err = -EBADF;

include/linux/file.h

+3 −4
Original line number Diff line number Diff line
@@ -94,6 +94,9 @@ extern void fd_install(unsigned int fd, struct file *file); 


extern int __receive_fd(struct file *file, int __user *ufd,

			unsigned int o_flags);



extern int receive_fd(struct file *file, unsigned int o_flags);



static inline int receive_fd_user(struct file *file, int __user *ufd,

				  unsigned int o_flags)

{
@@ -101,10 +104,6 @@ static inline int receive_fd_user(struct file *file, int __user *ufd, 
		return -EFAULT;

	return __receive_fd(file, ufd, o_flags);

}

static inline int receive_fd(struct file *file, unsigned int o_flags)

{

	return __receive_fd(file, NULL, o_flags);

}

int receive_fd_replace(int new_fd, struct file *file, unsigned int o_flags);



extern void flush_delayed_fput(void);