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ntsync: Introduce NTSYNC_IOC_MUTEX_READ.

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This corresponds to the NT syscall NtQueryMutant().

This returns the recursion count, owner, and abandoned state of the mutex.

Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com>
Link: https://lore.kernel.org/r/20241213193511.457338-14-zfigura@codeweavers.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Elizabeth Figura 2024-12-13 13:34:54 -06:00 • committed by Greg Kroah-Hartman
parent a948f4177c
commit 0b3c31449d
2 changed files with 27 additions and 0 deletions
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26
drivers/misc/ntsync.c
View file

@ -605,6 +605,30 @@ static int ntsync_sem_read(struct ntsync_obj *sem, void __user *argp)
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;
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;
@ -630,6 +654,8 @@ static long ntsync_obj_ioctl(struct file *file, unsigned int cmd,
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:

1
include/uapi/linux/ntsync.h
View file

@ -52,5 +52,6 @@ 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