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pid: add pidfd_prepare()

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Add a new helper that allows to reserve a pidfd and allocates a new
pidfd file that stashes the provided struct pid. This will allow us to
remove places that either open code this function or that call
pidfd_create() but then have to call close_fd() because there are still
failure points after pidfd_create() has been called.

Reviewed-by: Jan Kara <jack@suse.cz>
Message-Id: <20230327-pidfd-file-api-v1-1-5c0e9a3158e4@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner
2023-03-27 20:22:51 +02:00
parent 197b6b60ae
commit 6ae930d9db
3 changed files with 93 additions and 12 deletions
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19
kernel/pid.c
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@@ -594,20 +594,15 @@ struct task_struct *pidfd_get_task(int pidfd, unsigned int *flags)
*/
int pidfd_create(struct pid *pid, unsigned int flags)
{
int fd;
int pidfd;
struct file *pidfd_file;
if (!pid || !pid_has_task(pid, PIDTYPE_TGID))
return -EINVAL;
pidfd = pidfd_prepare(pid, flags, &pidfd_file);
if (pidfd < 0)
return pidfd;
if (flags & ~(O_NONBLOCK | O_RDWR | O_CLOEXEC))
return -EINVAL;
fd = anon_inode_getfd("[pidfd]", &pidfd_fops, get_pid(pid),
flags | O_RDWR | O_CLOEXEC);
if (fd < 0)
put_pid(pid);
return fd;
fd_install(pidfd, pidfd_file);
return pidfd;
}
/**