From: Bjorn Helgaas <helgaas@kernel.org>
To: Lianbo Jiang <lijiang@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>,
linux-kernel@vger.kernel.org, kexec@lists.infradead.org,
tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com,
x86@kernel.org, akpm@linux-foundation.org,
dan.j.williams@intel.com, thomas.lendacky@amd.com,
baiyaowei@cmss.chinamobile.com, tiwai@suse.de, bp@suse.de,
brijesh.singh@amd.com, dyoung@redhat.com, bhe@redhat.com
Subject: [PATCH 1/3] x86/kexec: Correct KEXEC_BACKUP_SRC_END off-by-one error
Date: Mon, 24 Sep 2018 17:14:46 -0500 [thread overview]
Message-ID: <153782728660.130337.15572354657557294628.stgit@bhelgaas-glaptop.roam.corp.google.com> (raw)
In-Reply-To: <153782698067.130337.12079523922130875402.stgit@bhelgaas-glaptop.roam.corp.google.com>
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 0-64KB range.
Define KEXEC_BACKUP_SRC_END as (640 * 1024UL - 1) so the KEXEC_BACKUP_SRC
region is [0-0xffff], not [0-0x10000].
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
next prev parent reply other threads:[~2018-09-24 22:14 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-21 7:32 [PATCH 0/3 v3] add reserved e820 ranges to the kdump kernel e820 table Lianbo Jiang
2018-09-21 7:32 ` [PATCH 1/3 v3] resource: fix an error which walks through iomem resources Lianbo Jiang
2018-09-24 17:52 ` Bjorn Helgaas
2018-09-25 7:08 ` lijiang
2018-09-24 22:14 ` [PATCH 0/3] find_next_iomem_res() fixes Bjorn Helgaas
2018-09-24 22:14 ` Bjorn Helgaas [this message]
2018-09-24 22:14 ` [PATCH 2/3] resource: Include resource end in walk_*() interfaces Bjorn Helgaas
2018-09-24 22:15 ` [PATCH 3/3] resource: Fix find_next_iomem_res() iteration issue Bjorn Helgaas
2018-09-25 8:58 ` Baoquan He
2018-09-25 11:20 ` Baoquan He
2018-09-27 5:27 ` lijiang
2018-09-27 14:03 ` Bjorn Helgaas
2018-09-28 5:09 ` lijiang
2018-09-28 13:10 ` Borislav Petkov
2018-09-26 9:22 ` [PATCH 0/3] find_next_iomem_res() fixes lijiang
2018-09-26 13:36 ` lijiang
2018-09-21 7:32 ` [PATCH 2/3 v3] x86/kexec_file: add e820 entry in case e820 type string matches to io resource name Lianbo Jiang
2018-09-21 7:32 ` [PATCH 3/3 v3] x86/kexec_file: add reserved e820 ranges to kdump kernel e820 table Lianbo Jiang
2018-10-16 2:56 ` [PATCH 0/3 v3] add reserved e820 ranges to the " Dave Young
2018-10-16 3:45 ` lijiang
2018-09-27 14:21 [PATCH 0/3] find_next_iomem_res() fixes Bjorn Helgaas
2018-09-27 14:21 ` [PATCH 1/3] x86/kexec: Correct KEXEC_BACKUP_SRC_END off-by-one error Bjorn Helgaas
2018-09-28 13:15 ` Borislav Petkov
2018-09-30 9:21 ` Dave Young
2018-09-30 9:27 ` Dave Young
2018-10-15 4:51 ` Dave Young
2018-10-15 11:18 ` Borislav Petkov
2018-10-15 13:44 ` Bjorn Helgaas
2018-10-16 2:51 ` Dave Young
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=153782728660.130337.15572354657557294628.stgit@bhelgaas-glaptop.roam.corp.google.com \
--to=helgaas@kernel.org \
--cc=akpm@linux-foundation.org \
--cc=baiyaowei@cmss.chinamobile.com \
--cc=bhe@redhat.com \
--cc=bp@suse.de \
--cc=brijesh.singh@amd.com \
--cc=dan.j.williams@intel.com \
--cc=dyoung@redhat.com \
--cc=hpa@zytor.com \
--cc=kexec@lists.infradead.org \
--cc=lijiang@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=tglx@linutronix.de \
--cc=thomas.lendacky@amd.com \
--cc=tiwai@suse.de \
--cc=vgoyal@redhat.com \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).