linux-kernel - [PATCH] Dump filtering supports x86_64 sparsemem(Re: Linux v2.6.24-rc1)

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <472178DE.9080409@mxs.nes.nec.co.jp>
Date:	Fri, 26 Oct 2007 14:19:26 +0900
From:	"Ken'ichi Ohmichi" <oomichi@....nes.nec.co.jp>
To:	lkml <linux-kernel@...r.kernel.org>
CC:	kexec-ml <kexec@...ts.infradead.org>
Subject: [PATCH] Dump filtering supports x86_64 sparsemem(Re: Linux v2.6.24-rc1)

Hi,

This patch adds the symbol "init_level4_pgt" to the vmcoreinfo data so
that makedumpfile (dump filtering command) supports x86_64 sparsemem 
kernel of linux-2.6.24.

makedumpfile creates a small dumpfile by excluding unnecessary pages for
the analysis. It checks attributes in page structures and distinguishes
necessary pages and unnecessary ones. To check them, makedumpfile gets
the vmcoreinfo data which has the minimum debugging information only for
dump filtering.

For older x86_64 kernel (linux-2.6.23 or before), makedumpfile translates
the virtual address of page structure into physical address by subtracting
PAGE_OFFSET from virtual address, but this translation isn't effective for
linux-2.6.24 sparsemem kernel, because its page structures are in virtual
memmap area. makedumpfile should translate their virtual address by 4-levels
paging and it needs the symbol "init_level4_pgt".

Thanks
Ken'ichi Ohmichi 

---
Signed-off-by: Ken'ichi Ohmichi <oomichi@....nes.nec.co.jp>

---
diff -rpuN a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
--- a/arch/x86/kernel/machine_kexec_64.c	2007-10-26 11:05:34.000000000 +0900
+++ b/arch/x86/kernel/machine_kexec_64.c	2007-10-26 11:16:24.000000000 +0900
@@ -233,6 +233,8 @@ NORET_TYPE void machine_kexec(struct kim

 void arch_crash_save_vmcoreinfo(void)
 {
+	VMCOREINFO_SYMBOL(init_level4_pgt);
+
 #ifdef CONFIG_ARCH_DISCONTIGMEM_ENABLE
 	VMCOREINFO_SYMBOL(node_data);
 	VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
_

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/