* [PATCH 4.14 079/135] x86/kexec: Dont setup EFI info if EFI runtime is not enabled
[not found] ` <20190312170341.127810985-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>
@ 2019-03-12 17:08 ` Greg Kroah-Hartman
0 siblings, 0 replies; only message in thread
From: Greg Kroah-Hartman @ 2019-03-12 17:08 UTC (permalink / raw)
To: linux-kernel-u79uwXL29TY76Z2rM5mHXA
Cc: rafael.j.wysocki-ral2JQCrhuEAvxtiuMwx3w, David Howells,
Yannik Sembritzki, H. Peter Anvin, Sasha Levin, Philipp Rudo,
bhe-H+wXaHxf7aLQT0dZR+AlfA, AKASHI Takahiro, x86-ml,
robert.moore-ral2JQCrhuEAvxtiuMwx3w,
linux-acpi-u79uwXL29TY76Z2rM5mHXA, Ingo Molnar, Borislav Petkov,
erik.schmauss-ral2JQCrhuEAvxtiuMwx3w, lenb-DgEjT+Ai2ygdnm+yROfE0A,
fanc.fnst-BthXqXjhjHXQFUHtdCDX3A, Thomas Gleixner, Kairui Song,
Ard Biesheuvel, Greg Kroah-Hartman, Dave Young,
kexec-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
stable-u79uwXL29TY76Z2rM5mHXA, Andrew Morton
4.14-stable review patch. If anyone has any objections, please let me know.
------------------
[ Upstream commit 2aa958c99c7fd3162b089a1a56a34a0cdb778de1 ]
Kexec-ing a kernel with "efi=noruntime" on the first kernel's command
line causes the following null pointer dereference:
BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
#PF error: [normal kernel read fault]
Call Trace:
efi_runtime_map_copy+0x28/0x30
bzImage64_load+0x688/0x872
arch_kexec_kernel_image_load+0x6d/0x70
kimage_file_alloc_init+0x13e/0x220
__x64_sys_kexec_file_load+0x144/0x290
do_syscall_64+0x55/0x1a0
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Just skip the EFI info setup if EFI runtime services are not enabled.
[ bp: Massage commit message. ]
Suggested-by: Dave Young <dyoung-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Signed-off-by: Kairui Song <kasong-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Signed-off-by: Borislav Petkov <bp-l3A5Bk7waGM@public.gmane.org>
Acked-by: Dave Young <dyoung-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: AKASHI Takahiro <takahiro.akashi-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Cc: Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
Cc: Ard Biesheuvel <ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Cc: bhe-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org
Cc: David Howells <dhowells-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: erik.schmauss-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org
Cc: fanc.fnst-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org
Cc: "H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
Cc: Ingo Molnar <mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: kexec-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Cc: lenb-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org
Cc: linux-acpi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: Philipp Rudo <prudo-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
Cc: rafael.j.wysocki-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org
Cc: robert.moore-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org
Cc: Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
Cc: x86-ml <x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Yannik Sembritzki <yannik-Ed5pum6jkczxnD6Ig1nlyA@public.gmane.org>
Link: https://lkml.kernel.org/r/20190118111310.29589-2-kasong-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org
Signed-off-by: Sasha Levin <sashal-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
arch/x86/kernel/kexec-bzimage64.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c
index 928b0c6083c9..4d948d87f01c 100644
--- a/arch/x86/kernel/kexec-bzimage64.c
+++ b/arch/x86/kernel/kexec-bzimage64.c
@@ -167,6 +167,9 @@ setup_efi_state(struct boot_params *params, unsigned long params_load_addr,
struct efi_info *current_ei = &boot_params.efi_info;
struct efi_info *ei = ¶ms->efi_info;
+ if (!efi_enabled(EFI_RUNTIME_SERVICES))
+ return 0;
+
if (!current_ei->efi_memmap_size)
return 0;
--
2.19.1
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