diff options
| author | Elizabeth Figura <zfigura@codeweavers.com> | 2024-12-13 13:34:54 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-01-08 13:18:11 +0100 |
| commit | 0b3c31449d28c83c0b8a8a7be569aa30d70b7764 (patch) | |
| tree | 2001246e1685c5ca6b0f3e63cb6d8538936c4b2e /drivers/misc/ntsync.c | |
| parent | a948f4177c3cce5f27648696da95c62c0253a099 (diff) | |
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 <zfigura@codeweavers.com>
Link: https://lore.kernel.org/r/20241213193511.457338-14-zfigura@codeweavers.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/ntsync.c')
| -rw-r--r-- | drivers/misc/ntsync.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c index b2043412c5cd..0047b13b6ebd 100644 --- a/drivers/misc/ntsync.c +++ b/drivers/misc/ntsync.c @@ -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: |