add boot partition size

hc

2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d

 kernel/fs/proc/vmcore.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  *	fs/proc/vmcore.c Interface for accessing the crash
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  * 				 dump from the system's previous life.
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@@ -16,14 +17,16 @@
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 #include <linux/slab.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/crash_dump.h>
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 #include <linux/list.h>
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+#include <linux/moduleparam.h>
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 #include <linux/mutex.h>
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 #include <linux/vmalloc.h>
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 #include <linux/pagemap.h>
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 #include <linux/uaccess.h>
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+#include <linux/mem_encrypt.h>
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 #include <asm/io.h>
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 #include "internal.h"
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@@ -51,6 +54,9 @@
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 /* Device Dump list and mutex to synchronize access to list */
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 static LIST_HEAD(vmcoredd_list);
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 static DEFINE_MUTEX(vmcoredd_mutex);
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+
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+static bool vmcoredd_disabled;
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+core_param(novmcoredd, vmcoredd_disabled, bool, 0);
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 #endif /* CONFIG_PROC_VMCORE_DEVICE_DUMP */
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61
 
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 /* Device Dump Size */
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@@ -97,8 +103,9 @@
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 }
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 /* Reads a page from the oldmem device from given offset. */
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-static ssize_t read_from_oldmem(char *buf, size_t count,
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-				u64 *ppos, int userbuf)
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+ssize_t read_from_oldmem(char *buf, size_t count,
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+			 u64 *ppos, int userbuf,
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+			 bool encrypted)
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 {
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 	unsigned long pfn, offset;
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 	size_t nr_bytes;
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@@ -124,8 +131,14 @@
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 			else if (clear_user(buf, nr_bytes))
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 				tmp = -EFAULT;
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 		} else {
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-			tmp = copy_oldmem_page(pfn, buf, nr_bytes,
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-						offset, userbuf);
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+			if (encrypted)
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+				tmp = copy_oldmem_page_encrypted(pfn, buf,
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+								 nr_bytes,
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+								 offset,
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+								 userbuf);
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+			else
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+				tmp = copy_oldmem_page(pfn, buf, nr_bytes,
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+						       offset, userbuf);
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 		}
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 		if (tmp < 0)
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 			return tmp;
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@@ -160,7 +173,7 @@
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  */
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 ssize_t __weak elfcorehdr_read(char *buf, size_t count, u64 *ppos)
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 {
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-	return read_from_oldmem(buf, count, ppos, 0);
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+	return read_from_oldmem(buf, count, ppos, 0, false);
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 }
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 /*
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@@ -168,7 +181,7 @@
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  */
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 ssize_t __weak elfcorehdr_read_notes(char *buf, size_t count, u64 *ppos)
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 {
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-	return read_from_oldmem(buf, count, ppos, 0);
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+	return read_from_oldmem(buf, count, ppos, 0, mem_encrypt_active());
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 }
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 /*
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@@ -178,6 +191,7 @@
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 				  unsigned long from, unsigned long pfn,
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 				  unsigned long size, pgprot_t prot)
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 {
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+	prot = pgprot_encrypted(prot);
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 	return remap_pfn_range(vma, from, pfn, size, prot);
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 }
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@@ -367,7 +381,8 @@
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 					    m->offset + m->size - *fpos,
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 					    buflen);
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 			start = m->paddr + *fpos - m->offset;
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-			tmp = read_from_oldmem(buffer, tsz, &start, userbuf);
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+			tmp = read_from_oldmem(buffer, tsz, &start,
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+					       userbuf, mem_encrypt_active());
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 			if (tmp < 0)
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 				return tmp;
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 			buflen -= tsz;
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@@ -417,7 +432,7 @@
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 		if (rc < 0) {
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 			unlock_page(page);
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 			put_page(page);
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-			return (rc == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS;
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+			return vmf_error(rc);
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 		}
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 		SetPageUptodate(page);
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 	}
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@@ -656,10 +671,10 @@
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 }
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 #endif
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673
 
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-static const struct file_operations proc_vmcore_operations = {
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-	.read		= read_vmcore,
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-	.llseek		= default_llseek,
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-	.mmap		= mmap_vmcore,
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+static const struct proc_ops vmcore_proc_ops = {
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+	.proc_read	= read_vmcore,
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+	.proc_lseek	= default_llseek,
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+	.proc_mmap	= mmap_vmcore,
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 };
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 static struct vmcore* __init get_new_element(void)
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@@ -1445,6 +1460,11 @@
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 	size_t data_size;
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 	int ret;
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+	if (vmcoredd_disabled) {
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+		pr_err_once("Device dump is disabled\n");
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+		return -EINVAL;
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+	}
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+
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 	if (!data || !strlen(data->dump_name) ||
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 	    !data->vmcoredd_callback || !data->size)
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 		return -EINVAL;
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@@ -1539,7 +1559,7 @@
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 	elfcorehdr_free(elfcorehdr_addr);
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 	elfcorehdr_addr = ELFCORE_ADDR_ERR;
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-	proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
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+	proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &vmcore_proc_ops);
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 	if (proc_vmcore)
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 		proc_vmcore->size = vmcore_size;
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 	return 0;