lkml.org 
[lkml]   [2021]   [May]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v7 02/12] file: Export receive_fd() to modules
Date
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 f633348029a5..ef4da2eaf25b 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -1135,6 +1135,12 @@ int __receive_fd(int fd, struct file *file, int __user *ufd, unsigned int o_flag
return new_fd;
}

+int receive_fd(struct file *file, unsigned int o_flags)
+{
+ return __receive_fd(-1, file, NULL, o_flags);
+}
+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 225982792fa2..4667f9567d3e 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(int 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(-1, file, ufd, o_flags);
}
-static inline int receive_fd(struct file *file, unsigned int o_flags)
-{
- return __receive_fd(-1, file, NULL, o_flags);
-}
static inline int receive_fd_replace(int fd, struct file *file, unsigned int o_flags)
{
return __receive_fd(fd, file, NULL, o_flags);
--
2.11.0
\
 
 \ /
  Last update: 2021-05-17 11:57    [W:0.184 / U:1.152 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site