[PATCH 6.15 45/49] pidfs: move O_RDWR into pidfs_alloc_file()

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

6.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Christian Brauner <brauner@kernel.org>

commit c57f07b235871c9e5bffaccd458dca2d9a62b164 upstream.

Since all pidfds must be O_RDWR currently enfore that directly in the
file allocation function itself instead of letting callers specify it.

Link: https://lore.kernel.org/20250414-work-coredump-v2-1-685bf231f828@kernel.org
Tested-by: Luca Boccassi <luca.boccassi@gmail.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/pidfs.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/pidfs.c
+++ b/fs/pidfs.c
@@ -888,6 +888,7 @@ struct file *pidfs_alloc_file(struct pid
 		return ERR_PTR(-ESRCH);
 
 	flags &= ~PIDFD_CLONE;
+	flags |= O_RDWR;
 	pidfd_file = dentry_open(&path, flags, current_cred());
 	/* Raise PIDFD_THREAD explicitly as do_dentry_open() strips it. */
 	if (!IS_ERR(pidfd_file))