pidfs: move O_RDWR into pidfs_alloc_file()

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>

diff --git a/fs/pidfs.c b/fs/pidfs.c
index 9d993ecadad75cbbb98b40e1507ae7a49e4932dc..3b39e471840b1b210de782d508fca830b4e541db 100644 (file)
--- a/fs/pidfs.c
+++ b/fs/pidfs.c
@@ -892,6 +892,7 @@ struct file *pidfs_alloc_file(struct pid *pid, unsigned int flags)
                return ERR_PTR(-ESRCH);
 
        flags &= ~PIDFD_STALE;
+       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))