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
| ||
|
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/
Powered by blists - more mailing lists