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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Andrei Borzenkov <arvidjaar@gmail.com>
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Date: Thu, 7 May 2015 20:24:24 +0300
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Subject: [PATCH] loader/linux: do not pad initrd with zeroes at the end
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Syslinux memdisk is using initrd image and needs to know uncompressed
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size in advance. For gzip uncompressed size is at the end of compressed
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stream. Grub padded each input file to 4 bytes at the end, which means
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syslinux got wrong size.
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Linux initramfs loader apparently does not care about trailing alignment.
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So change code to align beginning of each file instead which atomatically
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gives us the correct size for single file.
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Reported-By: David Shaw <dshaw@jabberwocky.com>
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(cherry picked from commit a8c473288d3f0a5e17a903a5121dea1a695dda3b)
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Resolves: rhbz#1219864
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---
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grub-core/loader/linux.c | 11 +++++++----
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1 file changed, 7 insertions(+), 4 deletions(-)
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diff --git a/grub-core/loader/linux.c b/grub-core/loader/linux.c
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index 117232f0c95..d2cd591f604 100644
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--- a/grub-core/loader/linux.c
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+++ b/grub-core/loader/linux.c
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@@ -161,6 +161,9 @@ grub_initrd_init (int argc, char *argv[],
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for (i = 0; i < argc; i++)
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{
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const char *fname = argv[i];
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+
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+ initrd_ctx->size = ALIGN_UP (initrd_ctx->size, 4);
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+
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if (grub_memcmp (argv[i], "newc:", 5) == 0)
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{
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const char *ptr, *eptr;
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@@ -205,7 +208,7 @@ grub_initrd_init (int argc, char *argv[],
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initrd_ctx->nfiles++;
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initrd_ctx->components[i].size
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= grub_file_size (initrd_ctx->components[i].file);
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- initrd_ctx->size += ALIGN_UP (initrd_ctx->components[i].size, 4);
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+ initrd_ctx->size += initrd_ctx->components[i].size;
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}
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if (newc)
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@@ -248,10 +251,12 @@ grub_initrd_load (struct grub_linux_initrd_context *initrd_ctx,
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int i;
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int newc = 0;
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struct dir *root = 0;
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+ grub_ssize_t cursize = 0;
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for (i = 0; i < initrd_ctx->nfiles; i++)
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{
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- grub_ssize_t cursize;
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+ grub_memset (ptr, 0, ALIGN_UP_OVERHEAD (cursize, 4));
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+ ptr += ALIGN_UP_OVERHEAD (cursize, 4);
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if (initrd_ctx->components[i].newc_name)
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{
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@@ -283,8 +288,6 @@ grub_initrd_load (struct grub_linux_initrd_context *initrd_ctx,
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return grub_errno;
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}
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ptr += cursize;
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- grub_memset (ptr, 0, ALIGN_UP_OVERHEAD (cursize, 4));
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- ptr += ALIGN_UP_OVERHEAD (cursize, 4);
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}
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if (newc)
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ptr = make_header (ptr, "TRAILER!!!", sizeof ("TRAILER!!!") - 1, 0, 0);
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