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LIBYA CYBER ARMY
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System : Linux uta-edu.server.ly 4.18.0-513.11.1.el8_9.x86_64 #1 SMP Wed Jan 17 02:00:40 EST 2024 x86_64
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Directory :  /usr/src/kernels/4.18.0-553.51.1.el8_10.x86_64/include/linux/

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Current File : //usr/src/kernels/4.18.0-553.51.1.el8_10.x86_64/include/linux/sockptr.h
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (c) 2020 Christoph Hellwig.
 *
 * Support for "universal" pointers that can point to either kernel or userspace
 * memory.
 */
#ifndef _LINUX_SOCKPTR_H
#define _LINUX_SOCKPTR_H

#include <linux/slab.h>
#include <linux/uaccess.h>

typedef struct {
	union {
		void		*kernel;
		void __user	*user;
	};
	bool		is_kernel : 1;
} sockptr_t;

static inline bool sockptr_is_kernel(sockptr_t sockptr)
{
	return sockptr.is_kernel;
}

static inline sockptr_t KERNEL_SOCKPTR(void *p)
{
	return (sockptr_t) { .kernel = p, .is_kernel = true };
}

static inline sockptr_t USER_SOCKPTR(void __user *p)
{
	return (sockptr_t) { .user = p };
}

static inline bool sockptr_is_null(sockptr_t sockptr)
{
	if (sockptr_is_kernel(sockptr))
		return !sockptr.kernel;
	return !sockptr.user;
}

static inline int copy_from_sockptr_offset(void *dst, sockptr_t src,
		size_t offset, size_t size)
{
	if (!sockptr_is_kernel(src))
		return copy_from_user(dst, src.user + offset, size);
	memcpy(dst, src.kernel + offset, size);
	return 0;
}

static inline int copy_from_sockptr(void *dst, sockptr_t src, size_t size)
{
	return copy_from_sockptr_offset(dst, src, 0, size);
}

static inline int copy_to_sockptr_offset(sockptr_t dst, size_t offset,
		const void *src, size_t size)
{
	if (!sockptr_is_kernel(dst))
		return copy_to_user(dst.user + offset, src, size);
	memcpy(dst.kernel + offset, src, size);
	return 0;
}

static inline void *memdup_sockptr(sockptr_t src, size_t len)
{
	void *p = kmalloc_track_caller(len, GFP_USER | __GFP_NOWARN);

	if (!p)
		return ERR_PTR(-ENOMEM);
	if (copy_from_sockptr(p, src, len)) {
		kfree(p);
		return ERR_PTR(-EFAULT);
	}
	return p;
}

static inline void *memdup_sockptr_nul(sockptr_t src, size_t len)
{
	char *p = kmalloc_track_caller(len + 1, GFP_KERNEL);

	if (!p)
		return ERR_PTR(-ENOMEM);
	if (copy_from_sockptr(p, src, len)) {
		kfree(p);
		return ERR_PTR(-EFAULT);
	}
	p[len] = '\0';
	return p;
}

static inline long strncpy_from_sockptr(char *dst, sockptr_t src, size_t count)
{
	if (sockptr_is_kernel(src)) {
		size_t len = min(strnlen(src.kernel, count - 1) + 1, count);

		memcpy(dst, src.kernel, len);
		return len;
	}
	return strncpy_from_user(dst, src.user, count);
}

#endif /* _LINUX_SOCKPTR_H */

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