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grub2/0111-arm-arm64-loader-Better-memory-allocation-and-error-.patch
Javier Martinez Canillas 46968b6e63
Update to 2.06~rc1 to fix a bunch of CVEs 
Resolves: CVE-2020-14372
Resolves: CVE-2020-25632
Resolves: CVE-2020-25647
Resolves: CVE-2020-27749
Resolves: CVE-2020-27779
Resolves: CVE-2021-20225
Resolves: CVE-2021-20233

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
2021-03-15 10:13:33 +01:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Thu, 11 Jul 2019 14:38:57 +0200
Subject: [PATCH] arm/arm64 loader: Better memory allocation and error
messages.
On mustang, our memory map looks like:
Type Physical start - end #Pages Size Attributes
reserved 0000004000000000-00000040001fffff 00000200 2MiB UC WC WT WB
conv-mem 0000004000200000-0000004393ffffff 00393e00 14654MiB UC WC WT WB
ldr-code 0000004394000000-00000043f7ffffff 00064000 1600MiB UC WC WT WB
BS-data 00000043f8000000-00000043f801ffff 00000020 128KiB UC WC WT WB
conv-mem 00000043f8020000-00000043fa15bfff 0000213c 34032KiB UC WC WT WB
ldr-code 00000043fa15c000-00000043fa2a1fff 00000146 1304KiB UC WC WT WB
ldr-data 00000043fa2a2000-00000043fa3e8fff 00000147 1308KiB UC WC WT WB
conv-mem 00000043fa3e9000-00000043fa3e9fff 00000001 4KiB UC WC WT WB
ldr-data 00000043fa3ea000-00000043fa3eafff 00000001 4KiB UC WC WT WB
ldr-code 00000043fa3eb000-00000043fa4affff 000000c5 788KiB UC WC WT WB
BS-code 00000043fa4b0000-00000043fa59ffff 000000f0 960KiB UC WC WT WB
RT-code 00000043fa5a0000-00000043fa5affff 00000010 64KiB RT UC WC WT WB
RT-data 00000043fa5b0000-00000043fa5bffff 00000010 64KiB RT UC WC WT WB
RT-code 00000043fa5c0000-00000043fa5cffff 00000010 64KiB RT UC WC WT WB
ldr-data 00000043fa5d0000-00000043fa5d0fff 00000001 4KiB UC WC WT WB
BS-code 00000043fa5d1000-00000043fa5ddfff 0000000d 52KiB UC WC WT WB
reserved 00000043fa5de000-00000043fa60ffff 00000032 200KiB UC WC WT WB
ACPI-rec 00000043fa610000-00000043fa6affff 000000a0 640KiB UC WC WT WB
ACPI-nvs 00000043fa6b0000-00000043fa6bffff 00000010 64KiB UC WC WT WB
ACPI-rec 00000043fa6c0000-00000043fa70ffff 00000050 320KiB UC WC WT WB
RT-code 00000043fa710000-00000043fa72ffff 00000020 128KiB RT UC WC WT WB
RT-data 00000043fa730000-00000043fa78ffff 00000060 384KiB RT UC WC WT WB
RT-code 00000043fa790000-00000043fa79ffff 00000010 64KiB RT UC WC WT WB
RT-data 00000043fa7a0000-00000043fa99ffff 00000200 2MiB RT UC WC WT WB
RT-code 00000043fa9a0000-00000043fa9affff 00000010 64KiB RT UC WC WT WB
RT-data 00000043fa9b0000-00000043fa9cffff 00000020 128KiB RT UC WC WT WB
BS-code 00000043fa9d0000-00000043fa9d9fff 0000000a 40KiB UC WC WT WB
reserved 00000043fa9da000-00000043fa9dbfff 00000002 8KiB UC WC WT WB
conv-mem 00000043fa9dc000-00000043fc29dfff 000018c2 25352KiB UC WC WT WB
BS-data 00000043fc29e000-00000043fc78afff 000004ed 5044KiB UC WC WT WB
conv-mem 00000043fc78b000-00000043fca01fff 00000277 2524KiB UC WC WT WB
BS-data 00000043fca02000-00000043fcea3fff 000004a2 4744KiB UC WC WT WB
conv-mem 00000043fcea4000-00000043fcea4fff 00000001 4KiB UC WC WT WB
BS-data 00000043fcea5000-00000043fd192fff 000002ee 3000KiB UC WC WT WB
conv-mem 00000043fd193000-00000043fd2b0fff 0000011e 1144KiB UC WC WT WB
BS-data 00000043fd2b1000-00000043ff80ffff 0000255f 38268KiB UC WC WT WB
BS-code 00000043ff810000-00000043ff99ffff 00000190 1600KiB UC WC WT WB
RT-code 00000043ff9a0000-00000043ff9affff 00000010 64KiB RT UC WC WT WB
conv-mem 00000043ff9b0000-00000043ff9bffff 00000010 64KiB UC WC WT WB
RT-data 00000043ff9c0000-00000043ff9effff 00000030 192KiB RT UC WC WT WB
conv-mem 00000043ff9f0000-00000043ffa05fff 00000016 88KiB UC WC WT WB
BS-data 00000043ffa06000-00000043ffffffff 000005fa 6120KiB UC WC WT WB
MMIO 0000000010510000-0000000010510fff 00000001 4KiB RT
MMIO 0000000010548000-0000000010549fff 00000002 8KiB RT
MMIO 0000000017000000-0000000017001fff 00000002 8KiB RT
MMIO 000000001c025000-000000001c025fff 00000001 4KiB RT
This patch adds a requirement when we're trying to find the base of ram, that
the memory we choose is actually /allocatable/ conventional memory, not merely
write-combining. On this machine that means we wind up with an allocation
around 0x4392XXXXXX, which is a reasonable address.
This also changes grub_efi_allocate_pages_real() so that if 0 is allocated, it
tries to allocate again starting with the same max address it did the first
time, rather than interposing GRUB_EFI_MAX_USABLE_ADDRESS there, so that any
per-platform constraints on its given address are maintained.
Signed-off-by: Peter Jones <pjones@redhat.com>
---
grub-core/kern/efi/mm.c | 33 +++++++++++++++-----
grub-core/loader/arm64/linux.c | 68 +++++++++++++++++++++++++++++++-----------
2 files changed, 76 insertions(+), 25 deletions(-)
diff --git a/grub-core/kern/efi/mm.c b/grub-core/kern/efi/mm.c
index 74360542062..e6abc923db2 100644
--- a/grub-core/kern/efi/mm.c
+++ b/grub-core/kern/efi/mm.c
@@ -154,6 +154,7 @@ grub_efi_allocate_pages_real (grub_efi_physical_address_t address,
{
grub_efi_status_t status;
grub_efi_boot_services_t *b;
+ grub_efi_physical_address_t ret = address;
/* Limit the memory access to less than 4GB for 32-bit platforms. */
if (address > GRUB_EFI_MAX_USABLE_ADDRESS)
@@ -166,19 +167,22 @@ grub_efi_allocate_pages_real (grub_efi_physical_address_t address,
}
b = grub_efi_system_table->boot_services;
- status = efi_call_4 (b->allocate_pages, alloctype, memtype, pages, &address);
+ status = efi_call_4 (b->allocate_pages, alloctype, memtype, pages, &ret);
if (status != GRUB_EFI_SUCCESS)
{
+ grub_dprintf ("efi",
+ "allocate_pages(%d, %d, 0x%0lx, 0x%016lx) = 0x%016lx\n",
+ alloctype, memtype, pages, address, status);
grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory"));
return NULL;
}
- if (address == 0)
+ if (ret == 0)
{
/* Uggh, the address 0 was allocated... This is too annoying,
so reallocate another one. */
- address = GRUB_EFI_MAX_USABLE_ADDRESS;
- status = efi_call_4 (b->allocate_pages, alloctype, memtype, pages, &address);
+ ret = address;
+ status = efi_call_4 (b->allocate_pages, alloctype, memtype, pages, &ret);
grub_efi_free_pages (0, pages);
if (status != GRUB_EFI_SUCCESS)
{
@@ -187,9 +191,9 @@ grub_efi_allocate_pages_real (grub_efi_physical_address_t address,
}
}
- grub_efi_store_alloc (address, pages);
+ grub_efi_store_alloc (ret, pages);
- return (void *) ((grub_addr_t) address);
+ return (void *) ((grub_addr_t) ret);
}
void *
@@ -709,8 +713,21 @@ grub_efi_get_ram_base(grub_addr_t *base_addr)
for (desc = memory_map, *base_addr = GRUB_EFI_MAX_USABLE_ADDRESS;
(grub_addr_t) desc < ((grub_addr_t) memory_map + memory_map_size);
desc = NEXT_MEMORY_DESCRIPTOR (desc, desc_size))
- if (desc->attribute & GRUB_EFI_MEMORY_WB)
- *base_addr = grub_min (*base_addr, desc->physical_start);
+ {
+ if (desc->type == GRUB_EFI_CONVENTIONAL_MEMORY &&
+ (desc->attribute & GRUB_EFI_MEMORY_WB))
+ {
+ *base_addr = grub_min (*base_addr, desc->physical_start);
+ grub_dprintf ("efi", "setting base_addr=0x%016lx\n", *base_addr);
+ }
+ else
+ {
+ grub_dprintf ("efi", "ignoring address 0x%016lx\n", desc->physical_start);
+ }
+ }
+
+ if (*base_addr == GRUB_EFI_MAX_USABLE_ADDRESS)
+ grub_dprintf ("efi", "base_addr 0x%016lx is probably wrong.\n", *base_addr);
grub_free(memory_map);
diff --git a/grub-core/loader/arm64/linux.c b/grub-core/loader/arm64/linux.c
index 04994d5c67d..70a0075ec5e 100644
--- a/grub-core/loader/arm64/linux.c
+++ b/grub-core/loader/arm64/linux.c
@@ -71,20 +71,25 @@ finalize_params_linux (void)
{
grub_efi_loaded_image_t *loaded_image = NULL;
int node, retval, len;
-
+ grub_err_t err = GRUB_ERR_NONE;
void *fdt;
fdt = grub_fdt_load (GRUB_EFI_LINUX_FDT_EXTRA_SPACE);
-
if (!fdt)
- goto failure;
+ {
+ err = grub_error(GRUB_ERR_BAD_OS, "failed to load FDT");
+ goto failure;
+ }
node = grub_fdt_find_subnode (fdt, 0, "chosen");
if (node < 0)
node = grub_fdt_add_subnode (fdt, 0, "chosen");
if (node < 1)
- goto failure;
+ {
+ err = grub_error(grub_errno, "failed to load chosen fdt node.");
+ goto failure;
+ }
/* Set initrd info */
if (initrd_start && initrd_end > initrd_start)
@@ -95,15 +100,26 @@ finalize_params_linux (void)
retval = grub_fdt_set_prop64 (fdt, node, "linux,initrd-start",
initrd_start);
if (retval)
- goto failure;
+ {
+ err = grub_error(retval, "Failed to set linux,initrd-start property");
+ goto failure;
+ }
+
retval = grub_fdt_set_prop64 (fdt, node, "linux,initrd-end",
initrd_end);
if (retval)
- goto failure;
+ {
+ err = grub_error(retval, "Failed to set linux,initrd-end property");
+ goto failure;
+ }
}
- if (grub_fdt_install() != GRUB_ERR_NONE)
- goto failure;
+ retval = grub_fdt_install();
+ if (retval != GRUB_ERR_NONE)
+ {
+ err = grub_error(retval, "Failed to install fdt");
+ goto failure;
+ }
grub_dprintf ("linux", "Installed/updated FDT configuration table @ %p\n",
fdt);
@@ -111,14 +127,20 @@ finalize_params_linux (void)
/* Convert command line to UCS-2 */
loaded_image = grub_efi_get_loaded_image (grub_efi_image_handle);
if (!loaded_image)
- goto failure;
+ {
+ err = grub_error(grub_errno, "Failed to install fdt");
+ goto failure;
+ }
loaded_image->load_options_size = len =
(grub_strlen (linux_args) + 1) * sizeof (grub_efi_char16_t);
loaded_image->load_options =
grub_efi_allocate_any_pages (GRUB_EFI_BYTES_TO_PAGES (loaded_image->load_options_size));
if (!loaded_image->load_options)
- return grub_error(GRUB_ERR_BAD_OS, "failed to create kernel parameters");
+ {
+ err = grub_error(GRUB_ERR_BAD_OS, "failed to create kernel parameters");
+ goto failure;
+ }
loaded_image->load_options_size =
2 * grub_utf8_to_utf16 (loaded_image->load_options, len,
@@ -128,7 +150,7 @@ finalize_params_linux (void)
failure:
grub_fdt_unload();
- return grub_error(GRUB_ERR_BAD_OS, "failed to install/update FDT");
+ return err;
}
static void
@@ -212,16 +234,28 @@ grub_linux_unload (void)
static void *
allocate_initrd_mem (int initrd_pages)
{
- grub_addr_t max_addr;
+ grub_addr_t max_addr = 0;
+ grub_err_t err;
+ void *ret;
- if (grub_efi_get_ram_base (&max_addr) != GRUB_ERR_NONE)
- return NULL;
+ err = grub_efi_get_ram_base (&max_addr);
+ if (err != GRUB_ERR_NONE)
+ {
+ grub_error (err, "grub_efi_get_ram_base() failed");
+ return NULL;
+ }
+
+ grub_dprintf ("linux", "max_addr: 0x%016lx, INITRD_MAX_ADDRESS_OFFSET: 0x%016llx\n",
+ max_addr, INITRD_MAX_ADDRESS_OFFSET);
max_addr += INITRD_MAX_ADDRESS_OFFSET - 1;
+ grub_dprintf ("linux", "calling grub_efi_allocate_pages_real (0x%016lx, 0x%08x, EFI_ALLOCATE_MAX_ADDRESS, EFI_LOADER_DATA)", max_addr, initrd_pages);
- return grub_efi_allocate_pages_real (max_addr, initrd_pages,
- GRUB_EFI_ALLOCATE_MAX_ADDRESS,
- GRUB_EFI_LOADER_DATA);
+ ret = grub_efi_allocate_pages_real (max_addr, initrd_pages,
+ GRUB_EFI_ALLOCATE_MAX_ADDRESS,
+ GRUB_EFI_LOADER_DATA);
+ grub_dprintf ("linux", "got 0x%016llx\n", (unsigned long long)ret);
+ return ret;
}
static grub_err_t
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