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From: Juergen Gross <jgross@suse.com>
To: linux-kernel@vger.kernel.org, x86@kernel.org
Cc: sstabellini@kernel.org, hpa@zytor.com, tglx@linutronix.de,
	mingo@redhat.com, bp@alien8.de, Juergen Gross <jgross@suse.com>
Subject: [PATCH] x86/boot: clear rsdp address in boot_params for broken loaders
Date: Mon,  3 Dec 2018 11:38:11 +0100	[thread overview]
Message-ID: <20181203103811.17056-1-jgross@suse.com> (raw)

In case a broken boot loader doesn't clear its struct boot_params clear
rsdp_addr in sanitize_boot_params().

This fixes commit e6e094e053af75 ("x86/acpi, x86/boot: Take RSDP
address from boot params if available") e.g. for the case of a boot via
systemd-boot.

Fixes: e6e094e053af75 ("x86/acpi, x86/boot: Take RSDP address from boot params if available")
Reported-by: Gunnar Krueger <taijian@posteo.de>
Tested-by: Gunnar Krueger <taijian@posteo.de>
Signed-off-by: Juergen Gross <jgross@suse.com>
---
 arch/x86/include/asm/bootparam_utils.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/include/asm/bootparam_utils.h b/arch/x86/include/asm/bootparam_utils.h
index a07ffd23e4dd..f6f6ef436599 100644
--- a/arch/x86/include/asm/bootparam_utils.h
+++ b/arch/x86/include/asm/bootparam_utils.h
@@ -36,6 +36,7 @@ static void sanitize_boot_params(struct boot_params *boot_params)
 	 */
 	if (boot_params->sentinel) {
 		/* fields in boot_params are left uninitialized, clear them */
+		boot_params->acpi_rsdp_addr = 0;
 		memset(&boot_params->ext_ramdisk_image, 0,
 		       (char *)&boot_params->efi_info -
 			(char *)&boot_params->ext_ramdisk_image);
-- 
2.16.4


             reply	other threads:[~2018-12-03 10:38 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-03 10:38 Juergen Gross [this message]
2018-12-03 15:54 ` [tip:x86/urgent] x86/boot: Clear RSDP " tip-bot for Juergen Gross
2018-12-03 23:07 ` [PATCH] x86/boot: clear rsdp " hpa
2018-12-04  5:32   ` Juergen Gross
2018-12-04  5:49     ` H. Peter Anvin
2018-12-04  6:03       ` Juergen Gross

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