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pidfs: support FS_IOC_GETVERSION

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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>
This commit is contained in:
Christian Brauner 2024-11-29 14:02:25 +01:00
parent 03c212bf3f
commit 230536ff6b
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1 changed files with 8 additions and 0 deletions
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8
fs/pidfs.c
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@ -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;