Messages in this thread | | | Subject | Re: [PATCH v10 02/17] file: Export receive_fd() to modules | From | Jason Wang <> | Date | Tue, 3 Aug 2021 15:45:59 +0800 |
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在 2021/7/29 下午3:34, Xie Yongji 写道: > 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> > --- > fs/file.c | 6 ++++++ > include/linux/file.h | 7 +++---- > 2 files changed, 9 insertions(+), 4 deletions(-) > > diff --git a/fs/file.c b/fs/file.c > index 86dc9956af32..210e540672aa 100644 > --- a/fs/file.c > +++ b/fs/file.c > @@ -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);
Any reason that receive_fd_user() can live in the file.h?
Thanks
> +} > +EXPORT_SYMBOL_GPL(receive_fd); > + > static int ksys_dup3(unsigned int oldfd, unsigned int newfd, int flags) > { > int err = -EBADF; > diff --git a/include/linux/file.h b/include/linux/file.h > index 2de2e4613d7b..51e830b4fe3a 100644 > --- a/include/linux/file.h > +++ b/include/linux/file.h > @@ -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);
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