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pidfs: check for valid ioctl commands

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Prior to doing any work, check whether the provided ioctl command is
supported by pidfs.

Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2024-11-29 21:16:37 +01:00
parent dc14abd337
commit 8ce3528188
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GPG key ID: 91C61BC06578DCA2
1 changed files with 24 additions and 0 deletions
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24
fs/pidfs.c
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@ -264,6 +264,27 @@ static long pidfd_info(struct task_struct *task, unsigned int cmd, unsigned long
return 0;
}
static bool pidfs_ioctl_valid(unsigned int cmd)
{
switch (cmd) {
case FS_IOC_GETVERSION:
case PIDFD_GET_CGROUP_NAMESPACE:
case PIDFD_GET_INFO:
case PIDFD_GET_IPC_NAMESPACE:
case PIDFD_GET_MNT_NAMESPACE:
case PIDFD_GET_NET_NAMESPACE:
case PIDFD_GET_PID_FOR_CHILDREN_NAMESPACE:
case PIDFD_GET_TIME_NAMESPACE:
case PIDFD_GET_TIME_FOR_CHILDREN_NAMESPACE:
case PIDFD_GET_UTS_NAMESPACE:
case PIDFD_GET_USER_NAMESPACE:
case PIDFD_GET_PID_NAMESPACE:
return true;
}
return false;
}
static long pidfd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct task_struct *task __free(put_task) = NULL;
@ -272,6 +293,9 @@ 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 (!pidfs_ioctl_valid(cmd))
return -ENOIOCTLCMD;
if (cmd == FS_IOC_GETVERSION) {
if (!arg)
return -EINVAL;