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fork: use pidfd_prepare() 

Stop open-coding get_unused_fd_flags() and anon_inode_getfile(). That's
brittle just for keeping the flags between both calls in sync. Use the
dedicated helper.

Message-Id: <20230327-pidfd-file-api-v1-2-5c0e9a3158e4@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2023-03-27 20:22:52 +02:00
parent 6ae930d9db
commit ca7707f543
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 2 additions and 11 deletions
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13
kernel/fork.c
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@ -2376,21 +2376,12 @@ static __latent_entropy struct task_struct *copy_process(
* if the fd table isn't shared).
*/
if (clone_flags & CLONE_PIDFD) {
retval = get_unused_fd_flags(O_RDWR | O_CLOEXEC);
/* Note that no task has been attached to @pid yet. */
retval = __pidfd_prepare(pid, O_RDWR | O_CLOEXEC, &pidfile);
if (retval < 0)
goto bad_fork_free_pid;
pidfd = retval;
pidfile = anon_inode_getfile("[pidfd]", &pidfd_fops, pid,
O_RDWR | O_CLOEXEC);
if (IS_ERR(pidfile)) {
put_unused_fd(pidfd);
retval = PTR_ERR(pidfile);
goto bad_fork_free_pid;
}
get_pid(pid); /* held by pidfile now */
retval = put_user(pidfd, args->pidfd);
if (retval)
goto bad_fork_put_pidfd;