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[2/5] initramfs: print helpful cpio error on "crc" magic

Message ID 20210922115222.8987-2-ddiss@suse.de (mailing list archive)
State New, archived
Headers show
Series [1/5] initramfs: move unnecessary memcmp from hot path | expand

Commit Message

David Disseldorp Sept. 22, 2021, 11:52 a.m. UTC 
Contrary to the buffer-format.rst documentation, initramfs cpio
extraction does not support "crc" archives, which carry "070702"
header magic. Make it a little clearer that "newc" (magic="070701") is
the only supported cpio format, by extending the POSIX.1 ASCII
(magic="070707") specific error message to also cover "crc" magic.

Signed-off-by: David Disseldorp <ddiss@suse.de>
---
 init/initramfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/init/initramfs.c b/init/initramfs.c
index f01590cefa2d..19b1c70446fc 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -257,7 +257,7 @@  static int __init do_collect(void)
 static int __init do_header(void)
 {
 	if (memcmp(collected, "070701", 6)) {
-		if (memcmp(collected, "070707", 6) == 0)
+		if (memcmp(collected, "0707", 4) == 0)
 			error("incorrect cpio method used: use -H newc option");
 		else
 			error("no cpio magic");