Patch "kdump: write correct address of mem_section into vmcoreinfo" has been added to the 4.14-stable tree

This is a note to let you know that I've just added the patch titled

kdump: write correct address of mem_section into vmcoreinfo

to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
kdump-write-correct-address-of-mem_section-into-vmcoreinfo.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: "Kirill A. Shutemov" <[email protected]>
Date: Fri, 12 Jan 2018 16:53:14 -0800
Subject: kdump: write correct address of mem_section into vmcoreinfo

From: Kirill A. Shutemov <[email protected]>

commit a0b1280368d1e91ab72f849ef095b4f07a39bbf1 upstream.

Depending on configuration mem_section can now be an array or a pointer to an array allocated dynamically. In most cases, we can continue to refer to it as 'mem_section' regardless of what it is.

But there's one exception: '&mem_section' means "address of the array" if mem_section is an array, but if mem_section is a pointer, it would mean "address of the pointer".

We've stepped onto this in kdump code. VMCOREINFO_SYMBOL(mem_section) writes down address of pointer into vmcoreinfo, not array as we wanted.

Let's introduce VMCOREINFO_SYMBOL_ARRAY() that would handle the situation correctly for both cases.

---
 include/linux/crash_core.h |    2 ++
 kernel/crash_core.c        |    2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

@@ -42,6 +42,8 @@ phys_addr_t paddr_vmcoreinfo_note(void);
 	vmcoreinfo_append_str("PAGESIZE=%ld\n", value)
 #define VMCOREINFO_SYMBOL(name) \
 	vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
+#define VMCOREINFO_SYMBOL_ARRAY(name) \
+	vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)name)
 #define VMCOREINFO_SIZE(name) \
 	vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
 			      (unsigned long)sizeof(name))

@@ -409,7 +409,7 @@ static int __init crash_save_vmcoreinfo_
 	VMCOREINFO_SYMBOL(contig_page_data);
 #endif
 #ifdef CONFIG_SPARSEMEM
-	VMCOREINFO_SYMBOL(mem_section);
+	VMCOREINFO_SYMBOL_ARRAY(mem_section);
 	VMCOREINFO_LENGTH(mem_section, NR_SECTION_ROOTS);
 	VMCOREINFO_STRUCT_SIZE(mem_section);
 	VMCOREINFO_OFFSET(mem_section, section_mem_map);

Patches currently in stable-queue which might be from [email protected] are

queue-4.14/kdump-write-correct-address-of-mem_section-into-vmcoreinfo.patch