grub2_2
/
0495-Try-to-pick-better-locations-for...

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Thu, 11 Jul 2019 17:17:02 +0200
Subject: [PATCH] Try to pick better locations for kernel and initrd

- Don't limit allocations on 64-bit platforms to < 0x[37f]fffffff if
  we're using the "large" code model ; use __UINTPTR_MAX__.
- Get the comparison right to check the address we've allocated.
- Fix the allocation for the command line as well.

*But*, when we did this some systems started failing badly; coudln't
parse partition tables, etc.  What's going on here is the disk controller
is silently failing DMAs to addresses above 4GB, so we're trying to parse
uninitialized (or HW zeroed) ram when looking for the partition table,
etc.

So to limit this, we make grub_malloc() pick addresses below 4GB on
x86_64, but the direct EFI page allocation functions can get addresses
above that.

Additionally, we now try to locate kernel+initrd+cmdline+etc below
0x7fffffff, and if they're too big to fit any memory window there, then
we try a higher address.

Signed-off-by: Peter Jones <pjones@redhat.com>
(cherry picked from commit 9035d4f9ea2f26a9d4412a0918d597ceb5365442)

Conflicts:
	grub-core/loader/i386/efi/linux.c
        Context diffs in includes.

Signed-off-by: Lenny Szubowicz <lszubowi@redhat.com>
---
 grub-core/kern/efi/mm.c           |  8 ++++----
 grub-core/loader/i386/efi/linux.c | 24 +++++++++++++++++-------
 include/grub/arm/efi/memory.h     |  1 +
 include/grub/arm64/efi/memory.h   |  1 +
 include/grub/i386/efi/memory.h    |  1 +
 include/grub/ia64/efi/memory.h    |  1 +
 include/grub/x86_64/efi/memory.h  |  4 +++-
 7 files changed, 28 insertions(+), 12 deletions(-)

diff --git a/grub-core/kern/efi/mm.c b/grub-core/kern/efi/mm.c
index 2d9c9032b..9e76f23e5 100644
--- a/grub-core/kern/efi/mm.c
+++ b/grub-core/kern/efi/mm.c
@@ -122,7 +122,7 @@ grub_efi_allocate_pages_max (grub_efi_physical_address_t max,
   grub_efi_boot_services_t *b;
   grub_efi_physical_address_t address = max;

-  if (max > 0xffffffff)
+  if (max > GRUB_EFI_MAX_USABLE_ADDRESS)
     return 0;

   b = grub_efi_system_table->boot_services;
@@ -472,7 +472,7 @@ filter_memory_map (grub_efi_memory_descriptor_t *memory_map,
     {
       if (desc->type == GRUB_EFI_CONVENTIONAL_MEMORY
 #if 1
-	  && desc->physical_start <= GRUB_EFI_MAX_USABLE_ADDRESS
+	  && desc->physical_start <= GRUB_EFI_MAX_ALLOCATION_ADDRESS
 #endif
 	  && desc->physical_start + PAGES_TO_BYTES (desc->num_pages) > 0x100000
 	  && desc->num_pages != 0)
@@ -490,9 +490,9 @@ filter_memory_map (grub_efi_memory_descriptor_t *memory_map,
 #if 1
 	  if (BYTES_TO_PAGES (filtered_desc->physical_start)
 	      + filtered_desc->num_pages
-	      > BYTES_TO_PAGES_DOWN (GRUB_EFI_MAX_USABLE_ADDRESS))
+	      > BYTES_TO_PAGES_DOWN (GRUB_EFI_MAX_ALLOCATION_ADDRESS))
 	    filtered_desc->num_pages
-	      = (BYTES_TO_PAGES_DOWN (GRUB_EFI_MAX_USABLE_ADDRESS)
+	      = (BYTES_TO_PAGES_DOWN (GRUB_EFI_MAX_ALLOCATION_ADDRESS)
 		 - BYTES_TO_PAGES (filtered_desc->physical_start));
 #endif

diff --git a/grub-core/loader/i386/efi/linux.c b/grub-core/loader/i386/efi/linux.c
index 576f8c07e..c5fdf522b 100644
--- a/grub-core/loader/i386/efi/linux.c
+++ b/grub-core/loader/i386/efi/linux.c
@@ -27,6 +27,7 @@
 #include <grub/lib/cmdline.h>
 #include <grub/efi/efi.h>
 #include <grub/efi/linux.h>
+#include <grub/cpu/efi/memory.h>
 #include <grub/tpm.h>
 #include <grub/safemath.h>

@@ -113,7 +114,9 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
 	}
     }

-  initrd_mem = grub_efi_allocate_pages_max (0x3fffffff, BYTES_TO_PAGES(size));
+  initrd_mem = grub_efi_allocate_pages_max (GRUB_EFI_MAX_ALLOCATION_ADDRESS, BYTES_TO_PAGES(size));
+  if (!initrd_mem)
+    initrd_mem = grub_efi_allocate_pages_max (GRUB_EFI_MAX_USABLE_ADDRESS, BYTES_TO_PAGES(size));
   if (!initrd_mem)
     {
       grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("can't allocate initrd"));
@@ -217,8 +220,11 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
 	}
     }

-  params = grub_efi_allocate_pages_max (0x3fffffff,
+  params = grub_efi_allocate_pages_max (GRUB_EFI_MAX_ALLOCATION_ADDRESS,
 					BYTES_TO_PAGES(sizeof(*params)));
+  if (!params)
+    params = grub_efi_allocate_pages_max (GRUB_EFI_MAX_USABLE_ADDRESS,
+					  BYTES_TO_PAGES(sizeof(*params)));
   if (! params)
     {
       grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot allocate kernel parameters");
@@ -288,8 +294,11 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
 #endif

   grub_dprintf ("linux", "setting up cmdline\n");
-  linux_cmdline = grub_efi_allocate_pages_max(0x3fffffff,
-					 BYTES_TO_PAGES(lh->cmdline_size + 1));
+  linux_cmdline = grub_efi_allocate_pages_max(GRUB_EFI_MAX_ALLOCATION_ADDRESS,
+					      BYTES_TO_PAGES(lh->cmdline_size + 1));
+  if (!linux_cmdline)
+    linux_cmdline = grub_efi_allocate_pages_max(GRUB_EFI_MAX_USABLE_ADDRESS,
+						BYTES_TO_PAGES(lh->cmdline_size + 1));
   if (!linux_cmdline)
     {
       grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("can't allocate cmdline"));
@@ -316,11 +325,12 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),

   kernel_mem = grub_efi_allocate_pages_max(lh->pref_address,
 					   BYTES_TO_PAGES(lh->init_size));
-
   if (!kernel_mem)
-    kernel_mem = grub_efi_allocate_pages_max(0x3fffffff,
+    kernel_mem = grub_efi_allocate_pages_max(GRUB_EFI_MAX_ALLOCATION_ADDRESS,
+					     BYTES_TO_PAGES(lh->init_size));
+  if (!kernel_mem)
+    kernel_mem = grub_efi_allocate_pages_max(GRUB_EFI_MAX_USABLE_ADDRESS,
 					     BYTES_TO_PAGES(lh->init_size));
-
   if (!kernel_mem)
     {
       grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("can't allocate kernel"));
diff --git a/include/grub/arm/efi/memory.h b/include/grub/arm/efi/memory.h
index 2c64918e3..a4c2ec835 100644
--- a/include/grub/arm/efi/memory.h
+++ b/include/grub/arm/efi/memory.h
@@ -2,5 +2,6 @@
 #include <grub/efi/memory.h>

 #define GRUB_EFI_MAX_USABLE_ADDRESS 0xffffffff
+#define GRUB_EFI_MAX_ALLOCATION_ADDRESS GRUB_EFI_MAX_USABLE_ADDRESS

 #endif /* ! GRUB_MEMORY_CPU_HEADER */
diff --git a/include/grub/arm64/efi/memory.h b/include/grub/arm64/efi/memory.h
index c6cb32417..acb61dca4 100644
--- a/include/grub/arm64/efi/memory.h
+++ b/include/grub/arm64/efi/memory.h
@@ -2,5 +2,6 @@
 #include <grub/efi/memory.h>

 #define GRUB_EFI_MAX_USABLE_ADDRESS 0xffffffffffffULL
+#define GRUB_EFI_MAX_ALLOCATION_ADDRESS GRUB_EFI_MAX_USABLE_ADDRESS

 #endif /* ! GRUB_MEMORY_CPU_HEADER */
diff --git a/include/grub/i386/efi/memory.h b/include/grub/i386/efi/memory.h
index 2c64918e3..a4c2ec835 100644
--- a/include/grub/i386/efi/memory.h
+++ b/include/grub/i386/efi/memory.h
@@ -2,5 +2,6 @@
 #include <grub/efi/memory.h>

 #define GRUB_EFI_MAX_USABLE_ADDRESS 0xffffffff
+#define GRUB_EFI_MAX_ALLOCATION_ADDRESS GRUB_EFI_MAX_USABLE_ADDRESS

 #endif /* ! GRUB_MEMORY_CPU_HEADER */
diff --git a/include/grub/ia64/efi/memory.h b/include/grub/ia64/efi/memory.h
index 2c64918e3..a4c2ec835 100644
--- a/include/grub/ia64/efi/memory.h
+++ b/include/grub/ia64/efi/memory.h
@@ -2,5 +2,6 @@
 #include <grub/efi/memory.h>

 #define GRUB_EFI_MAX_USABLE_ADDRESS 0xffffffff
+#define GRUB_EFI_MAX_ALLOCATION_ADDRESS GRUB_EFI_MAX_USABLE_ADDRESS

 #endif /* ! GRUB_MEMORY_CPU_HEADER */
diff --git a/include/grub/x86_64/efi/memory.h b/include/grub/x86_64/efi/memory.h
index 46e9145a3..e81cfb322 100644
--- a/include/grub/x86_64/efi/memory.h
+++ b/include/grub/x86_64/efi/memory.h
@@ -2,9 +2,11 @@
 #include <grub/efi/memory.h>

 #if defined (__code_model_large__)
-#define GRUB_EFI_MAX_USABLE_ADDRESS 0xffffffff
+#define GRUB_EFI_MAX_USABLE_ADDRESS __UINTPTR_MAX__
+#define GRUB_EFI_MAX_ALLOCATION_ADDRESS 0x7fffffff
 #else
 #define GRUB_EFI_MAX_USABLE_ADDRESS 0x7fffffff
+#define GRUB_EFI_MAX_ALLOCATION_ADDRESS GRUB_EFI_MAX_USABLE_ADDRESS
 #endif

 #endif /* ! GRUB_MEMORY_CPU_HEADER */