aa64: support pe/coff decompressor

Signed-off-by: Robbie Harwood <rharwood@redhat.com>
2024-11-24 14:32:58 +00:00 · 2022-09-08 20:17:42 +00:00 · 2022-09-08 20:17:42 +00:00 · c50cc54b88
commit c50cc54b88
parent db229abffb
4 changed files with 144 additions and 1 deletions
--- a/0281-loader-arm64-linux-Remove-magic-number-header-field-.patch
+++ b/0281-loader-arm64-linux-Remove-magic-number-header-field-.patch
@ -0,0 +1,43 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Ard Biesheuvel <ardb@kernel.org>
+Date: Thu, 11 Aug 2022 16:51:57 +0200
+Subject: [PATCH] loader/arm64/linux: Remove magic number header field check
+
+The "ARM\x64" magic number in the file header identifies an image as one
+that implements the bare metal boot protocol, allowing the loader to
+simply move the file to a suitably aligned address in memory, with
+sufficient headroom for the trailing .bss segment (the required memory
+size is described in the header as well).
+
+Note of this matters for GRUB, as it only supports EFI boot. EFI does
+not care about this magic number, and nor should GRUB: this prevents us
+from booting other PE linux images, such as the generic EFI zboot
+decompressor, which is a pure PE/COFF image, and does not implement the
+bare metal boot protocol.
+
+So drop the magic number check.
+
+Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
+Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
+Resolves: rhbz#2125069
+Signed-off-by: Jeremy Linton <jlinton@redhat.com>
+(cherry-picked from commit 69edb31205602c29293a8c6e67363bba2a4a1e66)
+Signed-off-by: Robbie Harwood <rharwood@redhat.com>
+---
+ grub-core/loader/arm64/linux.c | 3 ---
+ 1 file changed, 3 deletions(-)
+
+diff --git a/grub-core/loader/arm64/linux.c b/grub-core/loader/arm64/linux.c
+index de85583487..489d0c7173 100644
+--- a/grub-core/loader/arm64/linux.c
+++ b/grub-core/loader/arm64/linux.c
+@@ -55,9 +55,6 @@ static grub_addr_t initrd_end;
+ grub_err_t
+ grub_arch_efi_linux_check_image (struct linux_arch_kernel_header * lh)
+ {
+-  if (lh->magic != GRUB_LINUX_ARMXX_MAGIC_SIGNATURE)
+-    return grub_error(GRUB_ERR_BAD_OS, "invalid magic number");
+-
+   if ((lh->code0 & 0xffff) != GRUB_DOS_MAGIC)
+     return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
+ 		       N_("plain image kernel not supported - rebuild with CONFIG_(U)EFI_STUB enabled"));
--- a/0282-Correct-BSS-zeroing-on-aarch64.patch
+++ b/0282-Correct-BSS-zeroing-on-aarch64.patch
@ -0,0 +1,95 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Jeremy Linton <jeremy.linton@arm.com>
+Date: Tue, 6 Sep 2022 15:33:03 -0500
+Subject: [PATCH] Correct BSS zeroing on aarch64
+
+The aarch64 loader doesn't use efi bootservices, and
+therefor it has a very minimal loader which makes a lot
+of assumptions about the kernel layout. With the ZBOOT
+changes, the layout has changed a bit and we not should
+really be parsing the PE sections to determine how much
+data to copy, otherwise the BSS won't be setup properly.
+
+This code still makes a lot of assumptions about the
+the kernel layout, so its far from ideal, but it works.
+
+Resolves: rhbz#2125069
+
+Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
+---
+ grub-core/loader/arm64/linux.c | 27 ++++++++++++++++++++++-----
+ 1 file changed, 22 insertions(+), 5 deletions(-)
+
+diff --git a/grub-core/loader/arm64/linux.c b/grub-core/loader/arm64/linux.c
+index 489d0c7173..419f2201df 100644
+--- a/grub-core/loader/arm64/linux.c
+++ b/grub-core/loader/arm64/linux.c
+@@ -316,10 +316,12 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
+ static grub_err_t
+ parse_pe_header (void *kernel, grub_uint64_t *total_size,
+ 		 grub_uint32_t *entry_offset,
+-		 grub_uint32_t *alignment)
+		 grub_uint32_t *alignment,grub_uint32_t *code_size)
+ {
+   struct linux_arch_kernel_header *lh = kernel;
+   struct grub_armxx_linux_pe_header *pe;
+  grub_uint16_t i;
+  struct grub_pe32_section_table *sections;
+ 
+   pe = (void *)((unsigned long)kernel + lh->hdr_offset);
+ 
+@@ -329,6 +331,19 @@ parse_pe_header (void *kernel, grub_uint64_t *total_size,
+   *total_size   = pe->opt.image_size;
+   *entry_offset = pe->opt.entry_addr;
+   *alignment    = pe->opt.section_alignment;
+  *code_size    = pe->opt.section_alignment;
+
+  sections = (struct grub_pe32_section_table *) ((char *)&pe->opt +
+						 pe->coff.optional_header_size);
+  grub_dprintf ("linux", "num_sections     : %d\n",  pe->coff.num_sections );
+  for (i = 0 ; i < pe->coff.num_sections; i++)
+    {
+      grub_dprintf ("linux", "raw_size   : %lld\n",
+		    (long long) sections[i].raw_data_size);
+      grub_dprintf ("linux", "virt_size  : %lld\n",
+		    (long long) sections[i].virtual_size);
+      *code_size += sections[i].raw_data_size;
+    }
+ 
+   return GRUB_ERR_NONE;
+ }
+@@ -341,6 +356,7 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
+   grub_err_t err;
+   grub_off_t filelen;
+   grub_uint32_t align;
+  grub_uint32_t code_size;
+   void *kernel = NULL;
+   int nx_supported = 1;
+ 
+@@ -373,11 +389,12 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
+ 
+   if (grub_arch_efi_linux_check_image (kernel) != GRUB_ERR_NONE)
+     goto fail;
+-  if (parse_pe_header (kernel, &kernel_size, &handover_offset, &align) != GRUB_ERR_NONE)
+  if (parse_pe_header (kernel, &kernel_size, &handover_offset, &align, &code_size) != GRUB_ERR_NONE)
+     goto fail;
+   grub_dprintf ("linux", "kernel mem size     : %lld\n", (long long) kernel_size);
+   grub_dprintf ("linux", "kernel entry offset : %d\n", handover_offset);
+   grub_dprintf ("linux", "kernel alignment    : 0x%x\n", align);
+  grub_dprintf ("linux", "kernel size         : 0x%x\n", code_size);
+ 
+   err = grub_efi_check_nx_image_support((grub_addr_t)kernel, filelen, &nx_supported);
+   if (err != GRUB_ERR_NONE)
+@@ -396,9 +413,9 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
+   kernel_addr = (void *)ALIGN_UP((grub_uint64_t)kernel_alloc_addr, align);
+ 
+   grub_dprintf ("linux", "kernel @ %p\n", kernel_addr);
+-  grub_memcpy (kernel_addr, kernel, grub_min(filelen, kernel_size));
+-  if (kernel_size > filelen)
+-    grub_memset ((char *)kernel_addr + filelen, 0, kernel_size - filelen);
+  grub_memcpy (kernel_addr, kernel, grub_min(code_size, kernel_size));
+  if (kernel_size > code_size)
+    grub_memset ((char *)kernel_addr + code_size, 0, kernel_size - code_size);
+   grub_free(kernel);
+   kernel = NULL;
+ 
--- a/grub.patches
+++ b/grub.patches
@ -278,3 +278,5 @@ Patch0277: 0277-squish-give-up-on-rhgb-quiet.patch
 Patch0278: 0278-squish-BLS-only-write-etc-kernel-cmdline-if-writable.patch
 Patch0279: 0279-ieee1275-implement-vec5-for-cas-negotiation.patch
 Patch0280: 0280-blscfg-Don-t-root-device-in-emu-builds.patch
+Patch0281: 0281-loader-arm64-linux-Remove-magic-number-header-field-.patch
+Patch0282: 0282-Correct-BSS-zeroing-on-aarch64.patch
--- a/grub2.spec
+++ b/grub2.spec
@ -17,7 +17,7 @@
 Name:		grub2
 Epoch:		1
 Version:	2.06
-Release:	56%{?dist}
+Release:	57%{?dist}
 Summary:	Bootloader with support for Linux, Multiboot and more
 License:	GPLv3+
 URL:		http://www.gnu.org/software/grub/
@ -530,6 +530,9 @@ mv ${EFI_HOME}/grub.cfg.stb ${EFI_HOME}/grub.cfg
 %endif

 %changelog
+* Thu Sep 08 2022 Robbie Harwood <rharwood@redhat.com> - 2.06-57
+- aa64: support pe/coff decompressor
+
 * Wed Sep 07 2022 Robbie Harwood <rharwood@redhat.com> - 2.06-56
 - Revert patches to claim more memory for the arena