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