add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/x86/kernel/cpu/mtrr/if.c
..
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@@ -101,9 +101,6 @@
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 	int length;
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 	size_t linelen;
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-	if (!capable(CAP_SYS_ADMIN))
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-		return -EPERM;
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-
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 	memset(line, 0, LINE_SIZE);
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 	len = min_t(size_t, len, LINE_SIZE - 1);
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@@ -176,12 +173,12 @@
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 	case MTRRIOC_SET_PAGE_ENTRY:
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 	case MTRRIOC_DEL_PAGE_ENTRY:
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 	case MTRRIOC_KILL_PAGE_ENTRY:
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-		if (copy_from_user(&sentry, arg, sizeof sentry))
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+		if (copy_from_user(&sentry, arg, sizeof(sentry)))
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 			return -EFAULT;
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 		break;
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 	case MTRRIOC_GET_ENTRY:
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 	case MTRRIOC_GET_PAGE_ENTRY:
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-		if (copy_from_user(&gentry, arg, sizeof gentry))
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+		if (copy_from_user(&gentry, arg, sizeof(gentry)))
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 			return -EFAULT;
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 		break;
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 #ifdef CONFIG_COMPAT
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@@ -226,8 +223,6 @@
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 #ifdef CONFIG_COMPAT
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 	case MTRRIOC32_ADD_ENTRY:
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 #endif
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-		if (!capable(CAP_SYS_ADMIN))
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-			return -EPERM;
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 		err =
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 		    mtrr_file_add(sentry.base, sentry.size, sentry.type, true,
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 				  file, 0);
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@@ -236,24 +231,18 @@
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 #ifdef CONFIG_COMPAT
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 	case MTRRIOC32_SET_ENTRY:
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 #endif
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-		if (!capable(CAP_SYS_ADMIN))
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-			return -EPERM;
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 		err = mtrr_add(sentry.base, sentry.size, sentry.type, false);
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 		break;
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 	case MTRRIOC_DEL_ENTRY:
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 #ifdef CONFIG_COMPAT
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 	case MTRRIOC32_DEL_ENTRY:
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 #endif
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-		if (!capable(CAP_SYS_ADMIN))
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-			return -EPERM;
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 		err = mtrr_file_del(sentry.base, sentry.size, file, 0);
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 		break;
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 	case MTRRIOC_KILL_ENTRY:
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 #ifdef CONFIG_COMPAT
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 	case MTRRIOC32_KILL_ENTRY:
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 #endif
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-		if (!capable(CAP_SYS_ADMIN))
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-			return -EPERM;
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 		err = mtrr_del(-1, sentry.base, sentry.size);
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 		break;
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 	case MTRRIOC_GET_ENTRY:
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@@ -279,8 +268,6 @@
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 #ifdef CONFIG_COMPAT
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 	case MTRRIOC32_ADD_PAGE_ENTRY:
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 #endif
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-		if (!capable(CAP_SYS_ADMIN))
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-			return -EPERM;
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 		err =
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 		    mtrr_file_add(sentry.base, sentry.size, sentry.type, true,
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 				  file, 1);
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@@ -289,8 +276,6 @@
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 #ifdef CONFIG_COMPAT
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 	case MTRRIOC32_SET_PAGE_ENTRY:
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 #endif
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-		if (!capable(CAP_SYS_ADMIN))
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-			return -EPERM;
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 		err =
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 		    mtrr_add_page(sentry.base, sentry.size, sentry.type, false);
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 		break;
..
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@@ -298,16 +283,12 @@
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 #ifdef CONFIG_COMPAT
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 	case MTRRIOC32_DEL_PAGE_ENTRY:
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 #endif
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-		if (!capable(CAP_SYS_ADMIN))
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-			return -EPERM;
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 		err = mtrr_file_del(sentry.base, sentry.size, file, 1);
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 		break;
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 	case MTRRIOC_KILL_PAGE_ENTRY:
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 #ifdef CONFIG_COMPAT
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 	case MTRRIOC32_KILL_PAGE_ENTRY:
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 #endif
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-		if (!capable(CAP_SYS_ADMIN))
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-			return -EPERM;
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 		err = mtrr_del_page(-1, sentry.base, sentry.size);
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 		break;
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 	case MTRRIOC_GET_PAGE_ENTRY:
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@@ -334,7 +315,7 @@
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 	switch (cmd) {
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 	case MTRRIOC_GET_ENTRY:
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 	case MTRRIOC_GET_PAGE_ENTRY:
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-		if (copy_to_user(arg, &gentry, sizeof gentry))
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+		if (copy_to_user(arg, &gentry, sizeof(gentry)))
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 			err = -EFAULT;
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 		break;
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 #ifdef CONFIG_COMPAT
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@@ -373,28 +354,6 @@
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 	return single_release(ino, file);
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 }
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-static int mtrr_seq_show(struct seq_file *seq, void *offset);
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-
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-static int mtrr_open(struct inode *inode, struct file *file)
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-{
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-	if (!mtrr_if)
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-		return -EIO;
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-	if (!mtrr_if->get)
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-		return -ENXIO;
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-	return single_open(file, mtrr_seq_show, NULL);
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-}
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-
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-static const struct file_operations mtrr_fops = {
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-	.owner			= THIS_MODULE,
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-	.open			= mtrr_open,
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-	.read			= seq_read,
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-	.llseek			= seq_lseek,
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-	.write			= mtrr_write,
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-	.unlocked_ioctl		= mtrr_ioctl,
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-	.compat_ioctl		= mtrr_ioctl,
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-	.release		= mtrr_close,
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-};
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-
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 static int mtrr_seq_show(struct seq_file *seq, void *offset)
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 {
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 	char factor;
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@@ -426,6 +385,29 @@
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 	return 0;
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 }
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+static int mtrr_open(struct inode *inode, struct file *file)
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+{
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+	if (!mtrr_if)
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+		return -EIO;
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+	if (!mtrr_if->get)
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+		return -ENXIO;
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+	if (!capable(CAP_SYS_ADMIN))
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+		return -EPERM;
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+	return single_open(file, mtrr_seq_show, NULL);
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+}
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+
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+static const struct proc_ops mtrr_proc_ops = {
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+	.proc_open		= mtrr_open,
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+	.proc_read		= seq_read,
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+	.proc_lseek		= seq_lseek,
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+	.proc_write		= mtrr_write,
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+	.proc_ioctl		= mtrr_ioctl,
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+#ifdef CONFIG_COMPAT
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+	.proc_compat_ioctl	= mtrr_ioctl,
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+#endif
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+	.proc_release		= mtrr_close,
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+};
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+
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 static int __init mtrr_if_init(void)
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 {
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 	struct cpuinfo_x86 *c = &boot_cpu_data;
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@@ -436,7 +418,7 @@
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 	    (!cpu_has(c, X86_FEATURE_CENTAUR_MCR)))
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 		return -ENODEV;
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-	proc_create("mtrr", S_IWUSR | S_IRUGO, NULL, &mtrr_fops);
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+	proc_create("mtrr", S_IWUSR | S_IRUGO, NULL, &mtrr_proc_ops);
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 	return 0;
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 }
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 arch_initcall(mtrr_if_init);