The quilt patch titled
Subject: x86/kexec: fix incorrect end address passed to kernel_ident_mapping_init()
has been removed from the -mm tree. Its filename was
x86-kexec-fix-incorrect-end-address-passed-to-kernel_ident_mapping_init.patch
This patch was dropped because it was merged into the mm-nonmm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Yuntao Wang <ytcoode@xxxxxxxxx>
Subject: x86/kexec: fix incorrect end address passed to kernel_ident_mapping_init()
Date: Thu, 21 Dec 2023 18:17:02 +0800
kernel_ident_mapping_init() takes an exclusive memory range [pstart, pend)
where pend is not included in the range, while res represents an inclusive
memory range [start, end] where end is considered part of the range.
Passing [start, end] rather than [start, end+1) to
kernel_ident_mapping_init() may result in the identity mapping for the
end address not being set up.
For example, when res->start is equal to res->end,
kernel_ident_mapping_init() will not establish any identity mapping.
Similarly, when the value of res->end is a multiple of 2M and the page
table maps 2M pages, kernel_ident_mapping_init() will also not set up
identity mapping for res->end.
Therefore, passing res->end directly to kernel_ident_mapping_init() is
incorrect, the correct end address should be `res->end + 1`.
Link: https://lkml.kernel.org/r/20231221101702.20956-1-ytcoode@xxxxxxxxx
Signed-off-by: Yuntao Wang <ytcoode@xxxxxxxxx>
Cc: Baoquan He <bhe@xxxxxxxxxx>
Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Cc: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Simon Horman <horms@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/machine_kexec_64.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kernel/machine_kexec_64.c~x86-kexec-fix-incorrect-end-address-passed-to-kernel_ident_mapping_init
+++ a/arch/x86/kernel/machine_kexec_64.c
@@ -44,7 +44,7 @@ static int mem_region_callback(struct re
struct init_pgtable_data *data = arg;
return kernel_ident_mapping_init(data->info, data->level4p,
- res->start, res->end);
+ res->start, res->end + 1);
}
static int
_
Patches currently in -mm which might be from ytcoode@xxxxxxxxx are
x86-crash-remove-the-unused-image-parameter-from-prepare_elf_headers.patch
x86-crash-use-sz_1m-macro-instead-of-hardcoded-value.patch
crash_core-fix-and-simplify-the-logic-of-crash_exclude_mem_range.patch
x86-crash-fix-potential-cmem-ranges-array-overflow.patch
crash_core-optimize-crash_exclude_mem_range.patch
