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grub2/0165-Handle-multi-arch-64-on-32-boot-in-linuxefi-loader.patch
Javier Martinez Canillas afb0baacd6
Use BLS fragment filename as menu entry id and for sort criterion 
The BLS config filenames are guaranteed to be unique, so they can be
used as GRUB2 entry id and can also be used to sort the menu entries.

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
2018-07-02 17:33:09 +02:00

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From 10d6d333de0aa7e390a22ebc4b308f7ad937d5bc Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Tue, 14 Feb 2017 16:18:54 -0500
Subject: [PATCH 165/250] Handle multi-arch (64-on-32) boot in linuxefi loader.
Allow booting 64-bit kernels on 32-bit EFI on x86.
Signed-off-by: Peter Jones <pjones@redhat.com>
---
grub-core/loader/efi/linux.c | 9 +++-
grub-core/loader/i386/efi/linux.c | 110 +++++++++++++++++++++++++++-----------
include/grub/i386/linux.h | 7 ++-
3 files changed, 93 insertions(+), 33 deletions(-)
diff --git a/grub-core/loader/efi/linux.c b/grub-core/loader/efi/linux.c
index 8890bdf059a..2a7024134da 100644
--- a/grub-core/loader/efi/linux.c
+++ b/grub-core/loader/efi/linux.c
@@ -56,12 +56,17 @@ grub_linuxefi_secure_validate (void *data, grub_uint32_t size)
typedef void (*handover_func) (void *, grub_efi_system_table_t *, void *);
grub_err_t
-grub_efi_linux_boot (void *kernel_addr, grub_off_t offset,
+grub_efi_linux_boot (void *kernel_addr, grub_off_t handover_offset,
void *kernel_params)
{
handover_func hf;
+ int offset = 0;
- hf = (handover_func)((char *)kernel_addr + offset);
+#ifdef __x86_64__
+ offset = 512;
+#endif
+
+ hf = (handover_func)((char *)kernel_addr + handover_offset + offset);
hf (grub_efi_image_handle, grub_efi_system_table, kernel_params);
return GRUB_ERR_BUG;
diff --git a/grub-core/loader/i386/efi/linux.c b/grub-core/loader/i386/efi/linux.c
index 8b5a817b9d1..bed5919cab3 100644
--- a/grub-core/loader/i386/efi/linux.c
+++ b/grub-core/loader/i386/efi/linux.c
@@ -44,14 +44,10 @@ static char *linux_cmdline;
static grub_err_t
grub_linuxefi_boot (void)
{
- int offset = 0;
-
-#ifdef __x86_64__
- offset = 512;
-#endif
asm volatile ("cli");
- return grub_efi_linux_boot ((char *)kernel_mem, handover_offset + offset,
+ return grub_efi_linux_boot ((char *)kernel_mem,
+ handover_offset,
params);
}
@@ -119,6 +115,8 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
goto fail;
}
+ grub_dprintf ("linuxefi", "initrd_mem = %lx\n", (unsigned long) initrd_mem);
+
params->ramdisk_size = size;
params->ramdisk_image = (grub_uint32_t)(grub_addr_t) initrd_mem;
@@ -153,14 +151,20 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
return grub_errno;
}
+#define MIN(a, b) \
+ ({ typeof (a) _a = (a); \
+ typeof (b) _b = (b); \
+ _a < _b ? _a : _b; })
+
static grub_err_t
grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
int argc, char *argv[])
{
grub_file_t file = 0;
- struct linux_kernel_header lh;
+ struct linux_kernel_header *lh;
grub_ssize_t len, start, filelen;
void *kernel = NULL;
+ int setup_header_end_offset;
int rc;
grub_dl_ref (my_mod);
@@ -200,69 +204,107 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
goto fail;
}
- params = grub_efi_allocate_pages_max (0x3fffffff, BYTES_TO_PAGES(16384));
-
+ params = grub_efi_allocate_pages_max (0x3fffffff,
+ BYTES_TO_PAGES(sizeof(*params)));
if (! params)
{
grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot allocate kernel parameters");
goto fail;
}
- grub_memset (params, 0, 16384);
+ grub_dprintf ("linuxefi", "params = %p\n", (unsigned long) params);
- grub_memcpy (&lh, kernel, sizeof (lh));
+ grub_memset (params, 0, sizeof(*params));
- if (lh.boot_flag != grub_cpu_to_le16 (0xaa55))
+ setup_header_end_offset = *((grub_uint8_t *)kernel + 0x201);
+ grub_dprintf ("linuxefi", "copying %d bytes from %p to %p\n",
+ MIN(0x202+setup_header_end_offset,sizeof (*params)) - 0x1f1,
+ (grub_uint8_t *)kernel + 0x1f1,
+ (grub_uint8_t *)params + 0x1f1);
+ grub_memcpy ((grub_uint8_t *)params + 0x1f1,
+ (grub_uint8_t *)kernel + 0x1f1,
+ MIN(0x202+setup_header_end_offset,sizeof (*params)) - 0x1f1);
+ lh = (struct linux_kernel_header *)params;
+ grub_dprintf ("linuxefi", "lh is at %p\n", lh);
+ grub_dprintf ("linuxefi", "checking lh->boot_flag\n");
+ if (lh->boot_flag != grub_cpu_to_le16 (0xaa55))
{
grub_error (GRUB_ERR_BAD_OS, N_("invalid magic number"));
goto fail;
}
- if (lh.setup_sects > GRUB_LINUX_MAX_SETUP_SECTS)
+ grub_dprintf ("linuxefi", "checking lh->setup_sects\n");
+ if (lh->setup_sects > GRUB_LINUX_MAX_SETUP_SECTS)
{
grub_error (GRUB_ERR_BAD_OS, N_("too many setup sectors"));
goto fail;
}
- if (lh.version < grub_cpu_to_le16 (0x020b))
+ grub_dprintf ("linuxefi", "checking lh->version\n");
+ if (lh->version < grub_cpu_to_le16 (0x020b))
{
grub_error (GRUB_ERR_BAD_OS, N_("kernel too old"));
goto fail;
}
- if (!lh.handover_offset)
+ grub_dprintf ("linuxefi", "checking lh->handover_offset\n");
+ if (!lh->handover_offset)
{
grub_error (GRUB_ERR_BAD_OS, N_("kernel doesn't support EFI handover"));
goto fail;
}
+#if defined(__x86_64__) || defined(__aarch64__)
+ grub_dprintf ("linuxefi", "checking lh->xloadflags\n");
+ if (!(lh->xloadflags & LINUX_XLF_KERNEL_64))
+ {
+ grub_error (GRUB_ERR_BAD_OS, N_("kernel doesn't support 64-bit CPUs"));
+ goto fail;
+ }
+#endif
+
+#if defined(__i386__)
+ if ((lh->xloadflags & LINUX_XLF_KERNEL_64) &&
+ !(lh->xloadflags & LINUX_XLF_EFI_HANDOVER_32))
+ {
+ grub_error (GRUB_ERR_BAD_OS,
+ N_("kernel doesn't support 32-bit handover"));
+ goto fail;
+ }
+#endif
+
+ grub_dprintf ("linuxefi", "setting up cmdline\n");
linux_cmdline = grub_efi_allocate_pages_max(0x3fffffff,
- BYTES_TO_PAGES(lh.cmdline_size + 1));
-
+ BYTES_TO_PAGES(lh->cmdline_size + 1));
if (!linux_cmdline)
{
grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("can't allocate cmdline"));
goto fail;
}
+ grub_dprintf ("linuxefi", "linux_cmdline = %lx\n",
+ (unsigned long)linux_cmdline);
+
grub_memcpy (linux_cmdline, LINUX_IMAGE, sizeof (LINUX_IMAGE));
grub_create_loader_cmdline (argc, argv,
linux_cmdline + sizeof (LINUX_IMAGE) - 1,
- lh.cmdline_size - (sizeof (LINUX_IMAGE) - 1));
+ lh->cmdline_size - (sizeof (LINUX_IMAGE) - 1));
- lh.cmd_line_ptr = (grub_uint32_t)(grub_addr_t)linux_cmdline;
+ grub_dprintf ("linuxefi", "setting lh->cmd_line_ptr\n");
+ lh->cmd_line_ptr = (grub_uint32_t)(grub_addr_t)linux_cmdline;
- handover_offset = lh.handover_offset;
+ grub_dprintf ("linuxefi", "computing handover offset\n");
+ handover_offset = lh->handover_offset;
- start = (lh.setup_sects + 1) * 512;
+ start = (lh->setup_sects + 1) * 512;
len = grub_file_size(file) - start;
- kernel_mem = grub_efi_allocate_pages(lh.pref_address,
- BYTES_TO_PAGES(lh.init_size));
+ 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,
- BYTES_TO_PAGES(lh.init_size));
+ BYTES_TO_PAGES(lh->init_size));
if (!kernel_mem)
{
@@ -270,17 +312,25 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
goto fail;
}
- grub_memcpy (kernel_mem, (char *)kernel + start, len);
+ grub_dprintf ("linuxefi", "kernel_mem = %lx\n", (unsigned long) kernel_mem);
+
grub_loader_set (grub_linuxefi_boot, grub_linuxefi_unload, 0);
loaded=1;
+ grub_dprintf ("linuxefi", "setting lh->code32_start to %p\n", kernel_mem);
+ lh->code32_start = (grub_uint32_t)(grub_addr_t) kernel_mem;
- lh.code32_start = (grub_uint32_t)(grub_uint64_t) kernel_mem;
- grub_memcpy (params, &lh, 2 * 512);
+ grub_memcpy (kernel_mem, (char *)kernel + start, filelen - start);
- params->type_of_loader = 0x21;
+ grub_dprintf ("linuxefi", "setting lh->type_of_loader\n");
+ lh->type_of_loader = 0x6;
+
+ grub_dprintf ("linuxefi", "setting lh->ext_loader_{type,ver}\n");
+ params->ext_loader_type = 0;
+ params->ext_loader_ver = 2;
+ grub_dprintf("linuxefi", "kernel_mem: %p handover_offset: %08x\n",
+ kernel_mem, handover_offset);
fail:
-
if (file)
grub_file_close (file);
@@ -296,7 +346,7 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
if (linux_cmdline && !loaded)
grub_efi_free_pages ((grub_efi_physical_address_t)(grub_addr_t)
linux_cmdline,
- BYTES_TO_PAGES(lh.cmdline_size + 1));
+ BYTES_TO_PAGES(lh->cmdline_size + 1));
if (kernel_mem && !loaded)
grub_efi_free_pages ((grub_efi_physical_address_t)(grub_addr_t)kernel_mem,
diff --git a/include/grub/i386/linux.h b/include/grub/i386/linux.h
index fc36bdaf367..110ecf806fb 100644
--- a/include/grub/i386/linux.h
+++ b/include/grub/i386/linux.h
@@ -130,7 +130,12 @@ struct linux_kernel_header
grub_uint32_t kernel_alignment;
grub_uint8_t relocatable;
grub_uint8_t min_alignment;
- grub_uint8_t pad[2];
+#define LINUX_XLF_KERNEL_64 (1<<0)
+#define LINUX_XLF_CAN_BE_LOADED_ABOVE_4G (1<<1)
+#define LINUX_XLF_EFI_HANDOVER_32 (1<<2)
+#define LINUX_XLF_EFI_HANDOVER_64 (1<<3)
+#define LINUX_XLF_EFI_KEXEC (1<<4)
+ grub_uint16_t xloadflags;
grub_uint32_t cmdline_size;
grub_uint32_t hardware_subarch;
grub_uint64_t hardware_subarch_data;
--
2.17.1
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