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tools/bootconfig: Align the bootconfig applied initrd image size to 4

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Align the bootconfig applied initrd image size to 4. To fill the gap,
the bootconfig command uses null characters in between the bootconfig
data and the footer. This will expands the footer size but don't change
the checksum.
Thus the block image of the initrd file with bootconfig is as follows.

[initrd][bootconfig][(pad)][size][csum]["#BOOTCONFIG\n"]

Link: https://lkml.kernel.org/r/160576522046.320071.8550680670010950634.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu
2020-11-19 14:53:40 +09:00
committed by Steven Rostedt (VMware)
parent a995e6bc05
commit e1cef2d4c3
3 changed files with 43 additions and 25 deletions
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3
include/linux/bootconfig.h
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@@ -12,6 +12,9 @@
#define BOOTCONFIG_MAGIC "#BOOTCONFIG\n"
#define BOOTCONFIG_MAGIC_LEN 12
#define BOOTCONFIG_ALIGN_SHIFT 2
#define BOOTCONFIG_ALIGN (1 << BOOTCONFIG_ALIGN_SHIFT)
#define BOOTCONFIG_ALIGN_MASK (BOOTCONFIG_ALIGN - 1)
/* XBC tree node */
struct xbc_node {