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bootconfig: Add bootconfig magic word for indicating bootconfig explicitly

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Add bootconfig magic word to the end of bootconfig on initrd
image for indicating explicitly the bootconfig is there.
Also tools/bootconfig treats wrong size or wrong checksum or
parse error as an error, because if there is a bootconfig magic
word, there must be a bootconfig.

The bootconfig magic word is "#BOOTCONFIG\n", 12 bytes word.
Thus the block image of the initrd file with bootconfig is
as follows.

[Initrd][bootconfig][size][csum][#BOOTCONFIG\n]

Link: http://lkml.kernel.org/r/158220112263.26565.3944814205960612841.stgit@devnote2

Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu
2020-02-20 21:18:42 +09:00
committed by Steven Rostedt (VMware)
parent d8a953ddde
commit 85c46b78da
6 changed files with 49 additions and 17 deletions
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6
init/main.c
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@@ -374,7 +374,11 @@ static void __init setup_boot_config(const char *cmdline)
if (!initrd_end)
goto not_found;
hdr = (u32 *)(initrd_end - 8);
data = (char *)initrd_end - BOOTCONFIG_MAGIC_LEN;
if (memcmp(data, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN))
goto not_found;
hdr = (u32 *)(data - 8);
size = hdr[0];
csum = hdr[1];