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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: Xie Yongji <xieyongji@bytedance.com> Acked-by: Jason Wang <jasowang@redhat.com> Link: https://lore.kernel.org/r/20210831103634.33-4-xieyongji@bytedance.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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@ -1134,6 +1134,12 @@ int receive_fd_replace(int new_fd, struct file *file, unsigned int o_flags)
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return new_fd;
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}
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int receive_fd(struct file *file, unsigned int o_flags)
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{
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return __receive_fd(file, NULL, o_flags);
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}
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EXPORT_SYMBOL_GPL(receive_fd);
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static int ksys_dup3(unsigned int oldfd, unsigned int newfd, int flags)
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{
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int err = -EBADF;
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@ -94,6 +94,9 @@ extern void fd_install(unsigned int fd, struct file *file);
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extern int __receive_fd(struct file *file, int __user *ufd,
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unsigned int o_flags);
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extern int receive_fd(struct file *file, unsigned int o_flags);
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static inline int receive_fd_user(struct file *file, int __user *ufd,
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unsigned int o_flags)
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{
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@ -101,10 +104,6 @@ static inline int receive_fd_user(struct file *file, int __user *ufd,
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return -EFAULT;
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return __receive_fd(file, ufd, o_flags);
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}
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static inline int receive_fd(struct file *file, unsigned int o_flags)
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{
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return __receive_fd(file, NULL, o_flags);
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}
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int receive_fd_replace(int new_fd, struct file *file, unsigned int o_flags);
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extern void flush_delayed_fput(void);
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