Messages in this thread Patch in this message | | | Subject | [PATCH 1/3] x86/kexec: Correct KEXEC_BACKUP_SRC_END off-by-one error | From | Bjorn Helgaas <> | Date | Thu, 27 Sep 2018 09:21:55 -0500 |
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From: Bjorn Helgaas <bhelgaas@google.com>
The only use of KEXEC_BACKUP_SRC_END is as an argument to walk_system_ram_res():
int crash_load_segments(struct kimage *image) { ... walk_system_ram_res(KEXEC_BACKUP_SRC_START, KEXEC_BACKUP_SRC_END, image, determine_backup_region);
walk_system_ram_res() expects "start, end" arguments that are inclusive, i.e., the range to be walked includes both the start and end addresses.
KEXEC_BACKUP_SRC_END was previously defined as (640 * 1024UL), which is the first address *past* the desired 0-640KB range.
Define KEXEC_BACKUP_SRC_END as (640 * 1024UL - 1) so the KEXEC_BACKUP_SRC region is [0-0x9ffff], not [0-0xa0000].
Fixes: dd5f726076cc ("kexec: support for kexec on panic using new system call") Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> --- arch/x86/include/asm/kexec.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/kexec.h b/arch/x86/include/asm/kexec.h index f327236f0fa7..5125fca472bb 100644 --- a/arch/x86/include/asm/kexec.h +++ b/arch/x86/include/asm/kexec.h @@ -67,7 +67,7 @@ struct kimage; /* Memory to backup during crash kdump */ #define KEXEC_BACKUP_SRC_START (0UL) -#define KEXEC_BACKUP_SRC_END (640 * 1024UL) /* 640K */ +#define KEXEC_BACKUP_SRC_END (640 * 1024UL - 1) /* 640K */ /* * CPU does not save ss and sp on stack if execution is already
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