add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/proc/kcore.c
..
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@@ -22,7 +22,7 @@
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 #include <linux/vmalloc.h>
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 #include <linux/highmem.h>
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 #include <linux/printk.h>
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-#include <linux/bootmem.h>
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+#include <linux/memblock.h>
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 #include <linux/init.h>
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 #include <linux/slab.h>
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 #include <linux/uaccess.h>
..
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@@ -31,6 +31,7 @@
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 #include <linux/ioport.h>
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 #include <linux/memory.h>
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 #include <linux/sched/task.h>
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+#include <linux/security.h>
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 #include <asm/sections.h>
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 #include "internal.h"
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..
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@@ -192,8 +193,6 @@
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 		return 1;
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 	p = pfn_to_page(pfn);
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-	if (!memmap_valid_within(pfn, p, page_zone(p)))
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-		return 1;
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 	ent = kmalloc(sizeof(*ent), GFP_KERNEL);
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 	if (!ent)
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@@ -511,7 +510,8 @@
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 				 * Using bounce buffer to bypass the
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 				 * hardened user copy kernel text checks.
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 				 */
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-				if (probe_kernel_read(buf, (void *) start, tsz)) {
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+				if (copy_from_kernel_nofault(buf, (void *)start,
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+						tsz)) {
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 					if (clear_user(buffer, tsz)) {
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 						ret = -EFAULT;
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 						goto out;
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@@ -545,8 +545,13 @@
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 static int open_kcore(struct inode *inode, struct file *filp)
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 {
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+	int ret = security_locked_down(LOCKDOWN_KCORE);
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+
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 	if (!capable(CAP_SYS_RAWIO))
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 		return -EPERM;
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+
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+	if (ret)
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+		return ret;
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 	filp->private_data = kmalloc(PAGE_SIZE, GFP_KERNEL);
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 	if (!filp->private_data)
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@@ -568,11 +573,11 @@
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 	return 0;
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 }
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-static const struct file_operations proc_kcore_operations = {
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-	.read		= read_kcore,
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-	.open		= open_kcore,
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-	.release	= release_kcore,
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-	.llseek		= default_llseek,
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+static const struct proc_ops kcore_proc_ops = {
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+	.proc_read	= read_kcore,
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+	.proc_open	= open_kcore,
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+	.proc_release	= release_kcore,
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+	.proc_lseek	= default_llseek,
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 };
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 /* just remember that we have to update kcore */
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@@ -615,7 +620,7 @@
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 /*
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  * MODULES_VADDR has no intersection with VMALLOC_ADDR.
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  */
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-struct kcore_list kcore_modules;
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+static struct kcore_list kcore_modules;
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 static void __init add_modules_range(void)
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 {
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 	if (MODULES_VADDR != VMALLOC_START && MODULES_END != VMALLOC_END) {
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@@ -631,8 +636,7 @@
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 static int __init proc_kcore_init(void)
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 {
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-	proc_root_kcore = proc_create("kcore", S_IRUSR, NULL,
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-				      &proc_kcore_operations);
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+	proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &kcore_proc_ops);
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 	if (!proc_root_kcore) {
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 		pr_err("couldn't create /proc/kcore\n");
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 		return 0; /* Always returns 0. */