Patch "kernel/pid.c: remove static qualifier from pidfd_create()" has been added to the 5.10-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    kernel/pid.c: remove static qualifier from pidfd_create()

to the 5.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     kernel-pid.c-remove-static-qualifier-from-pidfd_crea.patch
and it can be found in the queue-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit ce17a49485781ae9d616beb8306b8efcc477f89d
Author: Matthew Bobrowski <repnop@xxxxxxxxxx>
Date:   Sun Aug 8 15:24:33 2021 +1000

    kernel/pid.c: remove static qualifier from pidfd_create()
    
    [ Upstream commit c576e0fcd6188d0edb50b0fb83f853433ef4819b ]
    
    With the idea of returning pidfds from the fanotify API, we need to
    expose a mechanism for creating pidfds. We drop the static qualifier
    from pidfd_create() and add its declaration to linux/pid.h so that the
    pidfd_create() helper can be called from other kernel subsystems
    i.e. fanotify.
    
    Link: https://lore.kernel.org/r/0c68653ec32f1b7143301f0231f7ed14062fd82b.1628398044.git.repnop@xxxxxxxxxx
    Signed-off-by: Matthew Bobrowski <repnop@xxxxxxxxxx>
    Acked-by: Christian Brauner <christian.brauner@xxxxxxxxxx>
    Signed-off-by: Jan Kara <jack@xxxxxxx>
    Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/include/linux/pid.h b/include/linux/pid.h
index fa10acb8d6a42..af308e15f174c 100644
--- a/include/linux/pid.h
+++ b/include/linux/pid.h
@@ -78,6 +78,7 @@ struct file;
 
 extern struct pid *pidfd_pid(const struct file *file);
 struct pid *pidfd_get_pid(unsigned int fd, unsigned int *flags);
+int pidfd_create(struct pid *pid, unsigned int flags);
 
 static inline struct pid *get_pid(struct pid *pid)
 {
diff --git a/kernel/pid.c b/kernel/pid.c
index 4856818c9de1a..74f0466757cbf 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -550,10 +550,12 @@ struct pid *pidfd_get_pid(unsigned int fd, unsigned int *flags)
  * Note, that this function can only be called after the fd table has
  * been unshared to avoid leaking the pidfd to the new process.
  *
+ * This symbol should not be explicitly exported to loadable modules.
+ *
  * Return: On success, a cloexec pidfd is returned.
  *         On error, a negative errno number will be returned.
  */
-static int pidfd_create(struct pid *pid, unsigned int flags)
+int pidfd_create(struct pid *pid, unsigned int flags)
 {
 	int fd;