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]
Date:   Mon, 22 Apr 2019 02:46:16 -0700
From:   tip-bot for Borislav Petkov <>
Subject: [tip:x86/urgent] x86/boot: Disable RSDP parsing temporarily

Commit-ID:  36f0c423552dacaca152324b8e9bda42a6d88865
Author:     Borislav Petkov <>
AuthorDate: Fri, 19 Apr 2019 15:40:14 +0200
Committer:  Borislav Petkov <>
CommitDate: Mon, 22 Apr 2019 11:36:43 +0200

x86/boot: Disable RSDP parsing temporarily

The original intention to move RDSP parsing very early, before KASLR
does its ranges selection, was to accommodate movable memory regions
machines (CONFIG_MEMORY_HOTREMOVE) to still be able to do memory

However, that broke kexec'ing a kernel on EFI machines because depending
on where the EFI systab was mapped, on at least one machine it isn't
present in the kexec mapping of the second kernel, leading to a triple
fault in the early code.

Fixing this properly requires significantly involved surgery and we
cannot allow ourselves to do that, that close to the merge window.

So disable the RSDP parsing code temporarily until it is fixed properly
in the next release cycle.

Signed-off-by: Borislav Petkov <>
Cc: Ard Biesheuvel <>
Cc: Baoquan He <>
Cc: Chao Fan <>
Cc: Dave Hansen <>
Cc: "H. Peter Anvin" <>
Cc: Ingo Molnar <>
Cc: Juergen Gross <>
Cc: Kees Cook <>
Cc: "Kirill A. Shutemov" <>
Cc: Thomas Gleixner <>
Cc: Tom Lendacky <>
Cc: x86-ml <>
 arch/x86/boot/compressed/misc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index c0d6c560df69..5a237e8dbf8d 100644
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -352,7 +352,7 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap,
 	boot_params->hdr.loadflags &= ~KASLR_FLAG;
 	/* Save RSDP address for later use. */
-	boot_params->acpi_rsdp_addr = get_rsdp_addr();
+	/* boot_params->acpi_rsdp_addr = get_rsdp_addr(); */

Powered by blists - more mailing lists