linux-kernel - [patch 10/12 v4] efi: only print saved efi runtime maps instead of all memmap ranges.

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>] [day] [month] [year] [list]

Message-Id: <20131125090039.026160705@dhcp-16-126.nay.redhat.com>
Date:	Mon, 25 Nov 2013 16:56:40 +0800
From:	dyoung@...hat.com
To:	linux-kernel@...r.kernel.org
Cc:	linux-efi@...r.kernel.org, x86@...nel.org, mjg59@...f.ucam.org,
	hpa@...or.com, James.Bottomley@...senPartnership.com,
	vgoyal@...hat.com, ebiederm@...ssion.com, horms@...ge.net.au,
	kexec@...ts.infradead.org, bp@...en8.de, greg@...ah.com,
	matt@...sole-pimps.org, toshi.kani@...com,
	Dave Young <dyoung@...hat.com>
Subject: [patch 10/12 v4] efi: only print saved efi runtime maps instead of all memmap ranges.

Hi,
References: <20131125085630.417850406@...p-16-126.nay.redhat.com>
Content-Disposition: inline; filename=10-print-efi-runtime-memmap.patch

For kexec/kdump kernel efi runtime mappings are saved, printing original whole
memmap ranges does not make sense anymore. So introduce a new function to only
print runtime maps in case kexec/kdump kernel is used.

Signed-off-by: Dave Young <dyoung@...hat.com>
---
 arch/x86/platform/efi/efi.c |   23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

--- efi.orig/arch/x86/platform/efi/efi.c
+++ efi/arch/x86/platform/efi/efi.c
@@ -430,6 +430,24 @@ int __init efi_memblock_x86_reserve_rang
 	return 0;
 }
 
+/* for kexec kernel runtime maps are passed in setup_data */
+static void __init print_saved_runtime_map(void)
+{
+#ifdef EFI_DEBUG
+	int i;
+	efi_memory_desc_t *md;
+
+	for (i = 0; i < nr_efi_runtime_map; i++) {
+		md = esdata->map + i;
+		pr_info("mem%02u: type=%u, attr=0x%llx, "
+			"range=[0x%016llx-0x%016llx) (%lluMB)\n",
+			i, md->type, md->attribute, md->phys_addr,
+			md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
+			(md->num_pages >> (20 - EFI_PAGE_SHIFT)));
+	}
+#endif  /*  EFI_DEBUG  */
+}
+
 static void __init print_efi_memmap(void)
 {
 #ifdef EFI_DEBUG
@@ -782,7 +800,10 @@ void __init efi_init(void)
 		x86_platform.set_wallclock = efi_set_rtc_mmss;
 	}
 #endif
-	print_efi_memmap();
+	if (esdata)
+		print_saved_runtime_map();
+	else
+		print_efi_memmap();
 }
 
 void __init efi_late_init(void)

--
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/