From 8fab682a279979b48f7aa8c665aad7af1f38f6ea Mon Sep 17 00:00:00 2001 From: Matthew Garrett Date: Sun, 9 Aug 2015 16:12:39 -0700 Subject: [PATCH 222/261] Rework linux command We want a single buffer that contains the entire kernel image in order to perform a TPM measurement. Allocate one and copy the entire kernel into it before pulling out the individual blocks later on. --- grub-core/loader/i386/linux.c | 34 +++++++++++++++++++++------------- 1 file changed, 21 insertions(+), 13 deletions(-) diff --git a/grub-core/loader/i386/linux.c b/grub-core/loader/i386/linux.c index bd37c69b5..53f74ae06 100644 --- a/grub-core/loader/i386/linux.c +++ b/grub-core/loader/i386/linux.c @@ -682,12 +682,13 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)), grub_file_t file = 0; struct linux_kernel_header lh; grub_uint8_t setup_sects; - grub_size_t real_size, prot_size, prot_file_size; + grub_size_t real_size, prot_size, prot_file_size, kernel_offset; grub_ssize_t len; int i; grub_size_t align, min_align; int relocatable; grub_uint64_t preferred_address = GRUB_LINUX_BZIMAGE_ADDR; + grub_uint8_t *kernel = NULL; grub_dl_ref (my_mod); @@ -701,7 +702,15 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)), if (! file) goto fail; - if (grub_file_read (file, &lh, sizeof (lh)) != sizeof (lh)) + len = grub_file_size (file); + kernel = grub_malloc (len); + if (!kernel) + { + grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("cannot allocate kernel buffer")); + goto fail; + } + + if (grub_file_read (file, kernel, len) != len) { if (!grub_errno) grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"), @@ -709,6 +718,9 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)), goto fail; } + grub_memcpy (&lh, kernel, sizeof (lh)); + kernel_offset = sizeof (lh); + if (lh.boot_flag != grub_cpu_to_le16_compile_time (0xaa55)) { grub_error (GRUB_ERR_BAD_OS, "invalid magic number"); @@ -808,13 +820,9 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)), linux_params.ps_mouse = linux_params.padding10 = 0; len = sizeof (linux_params) - sizeof (lh); - if (grub_file_read (file, (char *) &linux_params + sizeof (lh), len) != len) - { - if (!grub_errno) - grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"), - argv[0]); - goto fail; - } + + grub_memcpy (&linux_params + sizeof (lh), kernel + kernel_offset, len); + kernel_offset += len; linux_params.type_of_loader = GRUB_LINUX_BOOT_LOADER_TYPE; @@ -873,7 +881,7 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)), /* The other parameters are filled when booting. */ - grub_file_seek (file, real_size + GRUB_DISK_SECTOR_SIZE); + kernel_offset = real_size + GRUB_DISK_SECTOR_SIZE; grub_dprintf ("linux", "bzImage, setup=0x%x, size=0x%x\n", (unsigned) real_size, (unsigned) prot_size); @@ -1018,9 +1026,7 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)), - (sizeof (LINUX_IMAGE) - 1)); len = prot_file_size; - if (grub_file_read (file, prot_mode_mem, len) != len && !grub_errno) - grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"), - argv[0]); + grub_memcpy (prot_mode_mem, kernel + kernel_offset, len); if (grub_errno == GRUB_ERR_NONE) { @@ -1031,6 +1037,8 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)), fail: + grub_free (kernel); + if (file) grub_file_close (file); -- 2.13.5