diff --git a/0216-arm64-Fix-EFI-loader-kernel-image-allocation.patch b/0216-arm64-Fix-EFI-loader-kernel-image-allocation.patch new file mode 100644 index 0000000..600b461 --- /dev/null +++ b/0216-arm64-Fix-EFI-loader-kernel-image-allocation.patch @@ -0,0 +1,189 @@ +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 +From: Benjamin Herrenschmidt +Date: Mon, 2 Aug 2021 23:10:01 +1000 +Subject: [PATCH] arm64: Fix EFI loader kernel image allocation + +We are currently allocating just enough memory for the file size, +which means that the kernel BSS is in limbo (and not even zeroed). + +We are also not honoring the alignment specified in the image +PE header. + +This makes us use the PE optional header in which the kernel puts the +actual size it needs, including BSS, and make sure we clear it, and +honors the specified alignment for the image. + +Signed-off-by: Benjamin Herrenschmidt +--- + grub-core/loader/arm64/linux.c | 100 +++++++++++++++++++++++++++-------------- + 1 file changed, 66 insertions(+), 34 deletions(-) + +diff --git a/grub-core/loader/arm64/linux.c b/grub-core/loader/arm64/linux.c +index 47f8cf0d84b..4a252d5e7e9 100644 +--- a/grub-core/loader/arm64/linux.c ++++ b/grub-core/loader/arm64/linux.c +@@ -41,6 +41,8 @@ GRUB_MOD_LICENSE ("GPLv3+"); + static grub_dl_t my_mod; + static int loaded; + ++static void *kernel_alloc_addr; ++static grub_uint32_t kernel_alloc_pages; + static void *kernel_addr; + static grub_uint64_t kernel_size; + static grub_uint32_t handover_offset; +@@ -204,9 +206,8 @@ grub_linux_unload (void) + GRUB_EFI_BYTES_TO_PAGES (initrd_end - initrd_start)); + initrd_start = initrd_end = 0; + grub_free (linux_args); +- if (kernel_addr) +- grub_efi_free_pages ((grub_addr_t) kernel_addr, +- GRUB_EFI_BYTES_TO_PAGES (kernel_size)); ++ if (kernel_alloc_addr) ++ grub_efi_free_pages ((grub_addr_t) kernel_alloc_addr, kernel_alloc_pages); + grub_fdt_unload (); + return GRUB_ERR_NONE; + } +@@ -311,14 +312,35 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)), + return grub_errno; + } + ++static grub_err_t ++parse_pe_header (void *kernel, grub_uint64_t *total_size, ++ grub_uint32_t *entry_offset, ++ grub_uint32_t *alignment) ++{ ++ struct linux_arch_kernel_header *lh = kernel; ++ struct grub_armxx_linux_pe_header *pe; ++ ++ pe = (void *)((unsigned long)kernel + lh->hdr_offset); ++ ++ if (pe->opt.magic != GRUB_PE32_PE64_MAGIC) ++ return grub_error(GRUB_ERR_BAD_OS, "Invalid PE optional header magic"); ++ ++ *total_size = pe->opt.image_size; ++ *entry_offset = pe->opt.entry_addr; ++ *alignment = pe->opt.section_alignment; ++ ++ return GRUB_ERR_NONE; ++} ++ + static grub_err_t + grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)), + int argc, char *argv[]) + { + grub_file_t file = 0; +- struct linux_arch_kernel_header lh; +- struct grub_armxx_linux_pe_header *pe; + grub_err_t err; ++ grub_off_t filelen; ++ grub_uint32_t align; ++ void *kernel = NULL; + int rc; + + grub_dl_ref (my_mod); +@@ -333,40 +355,24 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)), + if (!file) + goto fail; + +- kernel_size = grub_file_size (file); +- +- if (grub_file_read (file, &lh, sizeof (lh)) < (long) sizeof (lh)) +- return grub_errno; +- +- if (grub_arch_efi_linux_check_image (&lh) != GRUB_ERR_NONE) +- goto fail; +- +- grub_loader_unset(); +- +- grub_dprintf ("linux", "kernel file size: %lld\n", (long long) kernel_size); +- kernel_addr = grub_efi_allocate_any_pages (GRUB_EFI_BYTES_TO_PAGES (kernel_size)); +- grub_dprintf ("linux", "kernel numpages: %lld\n", +- (long long) GRUB_EFI_BYTES_TO_PAGES (kernel_size)); +- if (!kernel_addr) ++ filelen = grub_file_size (file); ++ kernel = grub_malloc(filelen); ++ if (!kernel) + { +- grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory")); ++ grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("cannot allocate kernel load buffer")); + goto fail; + } + +- grub_file_seek (file, 0); +- if (grub_file_read (file, kernel_addr, kernel_size) +- < (grub_int64_t) kernel_size) ++ if (grub_file_read (file, kernel, filelen) < (grub_ssize_t)filelen) + { +- if (!grub_errno) +- grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"), argv[0]); ++ grub_error (GRUB_ERR_FILE_READ_ERROR, N_("Can't read kernel %s"), ++ argv[0]); + goto fail; + } + +- grub_dprintf ("linux", "kernel @ %p\n", kernel_addr); +- + if (grub_efi_get_secureboot () == GRUB_EFI_SECUREBOOT_MODE_ENABLED) + { +- rc = grub_linuxefi_secure_validate (kernel_addr, kernel_size); ++ rc = grub_linuxefi_secure_validate (kernel, filelen); + if (rc <= 0) + { + grub_error (GRUB_ERR_INVALID_COMMAND, +@@ -375,8 +381,32 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)), + } + } + +- pe = (void *)((unsigned long)kernel_addr + lh.hdr_offset); +- handover_offset = pe->opt.entry_addr; ++ 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) ++ 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_loader_unset(); ++ ++ kernel_alloc_pages = GRUB_EFI_BYTES_TO_PAGES (kernel_size + align - 1); ++ kernel_alloc_addr = grub_efi_allocate_any_pages (kernel_alloc_pages); ++ grub_dprintf ("linux", "kernel numpages: %d\n", kernel_alloc_pages); ++ if (!kernel_alloc_addr) ++ { ++ grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory")); ++ goto fail; ++ } ++ 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_free(kernel); ++ kernel = NULL; + + cmdline_size = grub_loader_cmdline_size (argc, argv) + sizeof (LINUX_IMAGE); + linux_args = grub_malloc (cmdline_size); +@@ -400,6 +430,9 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)), + } + + fail: ++ if (kernel) ++ grub_free (kernel); ++ + if (file) + grub_file_close (file); + +@@ -412,9 +445,8 @@ fail: + if (linux_args && !loaded) + grub_free (linux_args); + +- if (kernel_addr && !loaded) +- grub_efi_free_pages ((grub_addr_t) kernel_addr, +- GRUB_EFI_BYTES_TO_PAGES (kernel_size)); ++ if (kernel_alloc_addr && !loaded) ++ grub_efi_free_pages ((grub_addr_t) kernel_alloc_addr, kernel_alloc_pages); + + return grub_errno; + } diff --git a/grub.patches b/grub.patches index 9215894..4940f65 100644 --- a/grub.patches +++ b/grub.patches @@ -213,3 +213,4 @@ Patch0212: 0212-grub-set-password-Always-use-boot-grub2-user.cfg-as-.patch Patch0213: 0213-Remove-outdated-URL-for-BLS-document.patch Patch0214: 0214-templates-Check-for-EFI-at-runtime-instead-of-config.patch Patch0215: 0215-efi-Print-an-error-if-boot-to-firmware-setup-is-not-.patch +Patch0216: 0216-arm64-Fix-EFI-loader-kernel-image-allocation.patch