diff options
| author | Christian Brauner <brauner@kernel.org> | 2024-11-29 14:02:25 +0100 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2024-12-14 12:40:40 +0100 |
| commit | 230536ff6b06b199995687aa7fbf164970ebda85 (patch) | |
| tree | 708d79442a8807c49c8e0cf06fae38ca17b778aa /fs/pidfs.c | |
| parent | 03c212bf3fa86820baa5bcad75cfabb845166ccd (diff) | |
pidfs: support FS_IOC_GETVERSION
This will allow 32 bit userspace to detect when a given inode number has
been recycled and also to construct a unique 64 bit identifier.
Link: https://lore.kernel.org/r/20241129-work-pidfs-v2-3-61043d66fbce@kernel.org
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/pidfs.c')
| -rw-r--r-- | fs/pidfs.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/pidfs.c b/fs/pidfs.c index 71af820eafa5..8d62d900d20d 100644 --- a/fs/pidfs.c +++ b/fs/pidfs.c @@ -271,6 +271,14 @@ static long pidfd_ioctl(struct file *file, unsigned int cmd, unsigned long arg) struct ns_common *ns_common = NULL; struct pid_namespace *pid_ns; + if (cmd == FS_IOC_GETVERSION) { + if (!arg) + return -EINVAL; + + __u32 __user *argp = (__u32 __user *)arg; + return put_user(file_inode(file)->i_generation, argp); + } + task = get_pid_task(pid, PIDTYPE_PID); if (!task) return -ESRCH; |