File 0007-mkimage-create-new-ELF-Note-for-SBAT.patch of Package grub2

Overview Repositories Revisions Requests Users Attributes Meta

File 0007-mkimage-create-new-ELF-Note-for-SBAT.patch of Package grub2 (Revision 2cc54688389e95d1f0796aef7660ec43)

Currently displaying revision 2cc54688389e95d1f0796aef7660ec43 , Show latest

From 77316f09f133e9c7c5e1026b2b4f5749daac644a Mon Sep 17 00:00:00 2001
From: Sudhakar Kuppusamy <sudhakar@linux.ibm.com>
Date: Wed, 17 Apr 2024 23:48:51 +0530
Subject: [PATCH 7/8] mkimage: create new ELF Note for SBAT

we add a new ELF note for SBAT which store the SBAT data.
The name field of shall be the string "Secure-Boot-Advanced-Targeting", zero-padded
to 4 byte alignment. The type field shall be 0x41536967 (the ASCII values
for the string "sbat").

Signed-off-by: Sudhakar Kuppusamy <sudhakar@linux.ibm.com>
Co-authored-by: Daniel Axtens <dja@axtens.net>
---
 include/grub/util/mkimage.h |  4 +-
 util/grub-mkimagexx.c       | 92 +++++++++++++++++++++++++++----------
 2 files changed, 71 insertions(+), 25 deletions(-)

diff --git a/include/grub/util/mkimage.h b/include/grub/util/mkimage.h
index 6f1da89b9..881e3031f 100644
--- a/include/grub/util/mkimage.h
+++ b/include/grub/util/mkimage.h
@@ -51,12 +51,12 @@ grub_mkimage_load_image64 (const char *kernel_path,
 			   const struct grub_install_image_target_desc *image_target);
 void
 grub_mkimage_generate_elf32 (const struct grub_install_image_target_desc *image_target,
-			     int note, size_t appsig_size, char **core_img, size_t *core_size,
+			     int note, size_t appsig_size, char *sbat, char **core_img, size_t *core_size,
 			     Elf32_Addr target_addr,
 			     struct grub_mkimage_layout *layout);
 void
 grub_mkimage_generate_elf64 (const struct grub_install_image_target_desc *image_target,
-			     int note, size_t appsig_size, char **core_img, size_t *core_size,
+			     int note, size_t appsig_size, char *sbat, char **core_img, size_t *core_size,
 			     Elf64_Addr target_addr,
 			     struct grub_mkimage_layout *layout);
 
diff --git a/util/grub-mkimagexx.c b/util/grub-mkimagexx.c
index 9488f0525..0041b2d0b 100644
--- a/util/grub-mkimagexx.c
+++ b/util/grub-mkimagexx.c
@@ -85,6 +85,14 @@ struct grub_ieee1275_note
   struct grub_ieee1275_note_desc descriptor;
 };
 
+#define GRUB_SBAT_NOTE_NAME "Secure-Boot-Advanced-Targeting"
+#define GRUB_SBAT_NOTE_TYPE 0x73626174 /* "sbat" */
+
+struct grub_sbat_note {
+  Elf32_Nhdr header;
+  char name[ALIGN_UP(sizeof(GRUB_SBAT_NOTE_NAME), 4)];
+};
+
 #define GRUB_APPENDED_SIGNATURE_NOTE_NAME "Appended-Signature"
 #define GRUB_APPENDED_SIGNATURE_NOTE_TYPE 0x41536967 /* "ASig" */
 
@@ -217,7 +225,7 @@ grub_arm_reloc_jump24 (grub_uint32_t *target, Elf32_Addr sym_addr)
 
 void
 SUFFIX (grub_mkimage_generate_elf) (const struct grub_install_image_target_desc *image_target,
-				    int note, size_t appsig_size, char **core_img, size_t *core_size,
+				    int note, size_t appsig_size, char *sbat, char **core_img, size_t *core_size,
 				    Elf_Addr target_addr,
 				    struct grub_mkimage_layout *layout)
 {
@@ -226,10 +234,17 @@ SUFFIX (grub_mkimage_generate_elf) (const struct grub_install_image_target_desc
   Elf_Ehdr *ehdr;
   Elf_Phdr *phdr;
   Elf_Shdr *shdr;
-  int header_size, footer_size = 0;
+  int header_size, footer_size = 0, footer_offset = 0;
   int phnum = 1;
   int shnum = 4;
   int string_size = sizeof (".text") + sizeof ("mods") + 1;
+  char *footer;
+
+  if (sbat)
+    {
+      phnum++;
+      footer_size += ALIGN_UP (sizeof (struct grub_sbat_note) + layout->sbat_size, 4);
+    }
 
   if (appsig_size)
     {
@@ -263,6 +278,7 @@ SUFFIX (grub_mkimage_generate_elf) (const struct grub_install_image_target_desc
   ehdr = (void *) elf_img;
   phdr = (void *) (elf_img + sizeof (*ehdr));
   shdr = (void *) (elf_img + sizeof (*ehdr) + phnum * sizeof (*phdr));
+  footer = elf_img + program_size + header_size;
   memcpy (ehdr->e_ident, ELFMAG, SELFMAG);
   ehdr->e_ident[EI_CLASS] = ELFCLASSXX;
   if (!image_target->bigendian)
@@ -435,6 +451,8 @@ SUFFIX (grub_mkimage_generate_elf) (const struct grub_install_image_target_desc
       phdr->p_filesz = grub_host_to_target32 (XEN_NOTE_SIZE);
       phdr->p_memsz = 0;
       phdr->p_offset = grub_host_to_target32 (header_size + program_size);
+      footer = ptr;
+      footer_offset = XEN_NOTE_SIZE;
     }
 
   if (image_target->id == IMAGE_XEN_PVH)
@@ -468,6 +486,8 @@ SUFFIX (grub_mkimage_generate_elf) (const struct grub_install_image_target_desc
       phdr->p_filesz = grub_host_to_target32 (XEN_PVH_NOTE_SIZE);
       phdr->p_memsz = 0;
       phdr->p_offset = grub_host_to_target32 (header_size + program_size);
+      footer = ptr;
+      footer_offset = XEN_PVH_NOTE_SIZE;
     }
 
   if (note)
@@ -498,29 +518,55 @@ SUFFIX (grub_mkimage_generate_elf) (const struct grub_install_image_target_desc
       phdr->p_filesz = grub_host_to_target32 (note_size);
       phdr->p_memsz = 0;
       phdr->p_offset = grub_host_to_target32 (header_size + program_size);
+      footer = (elf_img + program_size + header_size + note_size);
+      footer_offset += note_size;
     }
 
-  if (appsig_size) {
-    int note_size = ALIGN_UP(sizeof (struct grub_appended_signature_note) + appsig_size, 4);
-    struct grub_appended_signature_note *note_ptr = (struct grub_appended_signature_note *)
-      (elf_img + program_size + header_size + (note ? sizeof (struct grub_ieee1275_note) : 0));
-
-    note_ptr->header.n_namesz = grub_host_to_target32 (sizeof (GRUB_APPENDED_SIGNATURE_NOTE_NAME));
-    /* needs to sit at the end, so we round this up and sign some zero padding */
-    note_ptr->header.n_descsz = grub_host_to_target32 (ALIGN_UP(appsig_size, 4));
-    note_ptr->header.n_type = grub_host_to_target32 (GRUB_APPENDED_SIGNATURE_NOTE_TYPE);
-    strcpy (note_ptr->name, GRUB_APPENDED_SIGNATURE_NOTE_NAME);
-
-    phdr++;
-    phdr->p_type = grub_host_to_target32 (PT_NOTE);
-    phdr->p_flags = grub_host_to_target32 (PF_R);
-    phdr->p_align = grub_host_to_target32 (image_target->voidp_sizeof);
-    phdr->p_vaddr = 0;
-    phdr->p_paddr = 0;
-    phdr->p_filesz = grub_host_to_target32 (note_size);
-    phdr->p_memsz = 0;
-    phdr->p_offset = grub_host_to_target32 (header_size + program_size + (note ? sizeof (struct grub_ieee1275_note) : 0));
-  }
+  if (sbat)
+    {
+      int note_size = ALIGN_UP(sizeof (struct grub_sbat_note) + layout->sbat_size, 4);
+      struct grub_sbat_note *note_ptr = (struct grub_sbat_note *)footer;
+
+      note_ptr->header.n_namesz = grub_host_to_target32 (sizeof (GRUB_SBAT_NOTE_NAME));
+      note_ptr->header.n_descsz = grub_host_to_target32 (ALIGN_UP(layout->sbat_size, 4));
+      note_ptr->header.n_type = grub_host_to_target32 (GRUB_SBAT_NOTE_TYPE);
+      memcpy (note_ptr->name, GRUB_SBAT_NOTE_NAME, sizeof (GRUB_SBAT_NOTE_NAME));
+      memcpy ((char *)(note_ptr + 1), sbat, layout->sbat_size);
+
+      phdr++;
+      phdr->p_type = grub_host_to_target32 (PT_NOTE);
+      phdr->p_flags = grub_host_to_target32 (PF_R);
+      phdr->p_align = grub_host_to_target32 (image_target->voidp_sizeof);
+      phdr->p_vaddr = 0;
+      phdr->p_paddr = 0;
+      phdr->p_filesz = grub_host_to_target32 (note_size);
+      phdr->p_memsz = 0;
+      phdr->p_offset = grub_host_to_target32 (header_size + program_size + footer_offset);
+
+      footer += note_size;
+      footer_offset += note_size;
+    }
+
+  if (appsig_size)
+    {
+      int note_size = ALIGN_UP (sizeof (struct grub_appended_signature_note) + appsig_size, 4);
+      struct grub_appended_signature_note *note_ptr = (struct grub_appended_signature_note *)footer;
+      note_ptr->header.n_namesz = grub_host_to_target32 (sizeof (GRUB_APPENDED_SIGNATURE_NOTE_NAME));
+      /* needs to sit at the end, so we round this up and sign some zero padding */
+      note_ptr->header.n_descsz = grub_host_to_target32 (ALIGN_UP (appsig_size, 4));
+      note_ptr->header.n_type = grub_host_to_target32 (GRUB_APPENDED_SIGNATURE_NOTE_TYPE);
+      strcpy (note_ptr->name, GRUB_APPENDED_SIGNATURE_NOTE_NAME);
+
+      phdr++;
+      phdr->p_type = grub_host_to_target32 (PT_NOTE);
+      phdr->p_flags = grub_host_to_target32 (PF_R);
+      phdr->p_align = grub_host_to_target32 (image_target->voidp_sizeof);
+      phdr->p_vaddr = 0;
+      phdr->p_paddr = 0;
+      phdr->p_filesz = grub_host_to_target32 (note_size);
+      phdr->p_memsz = 0;
+      phdr->p_offset = grub_host_to_target32 (header_size + program_size + footer_offset);
+    }
 
   {
     char *str_start = (elf_img + sizeof (*ehdr) + phnum * sizeof (*phdr)
-- 
2.47.0

Places

File 0007-mkimage-create-new-ELF-Note-for-SBAT.patch of Package grub2 (Revision 2cc54688389e95d1f0796aef7660ec43)

Places