From 7891b7d15abd12975aebb955821fbc43353b45d6 Mon Sep 17 00:00:00 2001 From: Elizabeth Figura Date: Sun, 19 May 2024 15:24:37 -0500 Subject: ntsync: Introduce NTSYNC_IOC_MUTEX_READ. This corresponds to the NT syscall NtQueryMutant(). This returns the recursion count, owner, and abandoned state of the mutex. Signed-off-by: Elizabeth Figura --- drivers/misc/ntsync.c | 28 ++++++++++++++++++++++++++++ include/uapi/linux/ntsync.h | 1 + 2 files changed, 29 insertions(+) --- a/drivers/misc/ntsync.c +++ b/drivers/misc/ntsync.c @@ -607,6 +607,32 @@ static int ntsync_sem_read(struct ntsync return 0; } +static int ntsync_mutex_read(struct ntsync_obj *mutex, void __user *argp) +{ + struct ntsync_mutex_args __user *user_args = argp; + struct ntsync_device *dev = mutex->dev; + struct ntsync_mutex_args args; + bool all; + int ret; + + if (mutex->type != NTSYNC_TYPE_MUTEX) + return -EINVAL; + + args.mutex = 0; + + all = ntsync_lock_obj(dev, mutex); + + args.count = mutex->u.mutex.count; + args.owner = mutex->u.mutex.owner; + ret = mutex->u.mutex.ownerdead ? -EOWNERDEAD : 0; + + ntsync_unlock_obj(dev, mutex, all); + + if (copy_to_user(user_args, &args, sizeof(args))) + return -EFAULT; + return ret; +} + static int ntsync_obj_release(struct inode *inode, struct file *file) { struct ntsync_obj *obj = file->private_data; @@ -632,6 +658,8 @@ static long ntsync_obj_ioctl(struct file return ntsync_mutex_unlock(obj, argp); case NTSYNC_IOC_MUTEX_KILL: return ntsync_mutex_kill(obj, argp); + case NTSYNC_IOC_MUTEX_READ: + return ntsync_mutex_read(obj, argp); case NTSYNC_IOC_EVENT_SET: return ntsync_event_set(obj, argp, false); case NTSYNC_IOC_EVENT_RESET: --- a/include/uapi/linux/ntsync.h +++ b/include/uapi/linux/ntsync.h @@ -55,5 +55,6 @@ struct ntsync_wait_args { #define NTSYNC_IOC_EVENT_RESET _IOR ('N', 0x89, __u32) #define NTSYNC_IOC_EVENT_PULSE _IOR ('N', 0x8a, __u32) #define NTSYNC_IOC_SEM_READ _IOR ('N', 0x8b, struct ntsync_sem_args) +#define NTSYNC_IOC_MUTEX_READ _IOR ('N', 0x8c, struct ntsync_mutex_args) #endif