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From fbf5892df21a8ccfcb2fda0fd65bc3169c89ed28 Mon Sep 17 00:00:00 2001
From: Martin Nybo Andersen <tweek@tweek.dk>
Date: Fri, 15 Sep 2023 12:15:39 +0200
Subject: kbuild: Use CRC32 and a 1MiB dictionary for XZ compressed modules
Kmod is now (since kmod commit 09c9f8c5df04 ("libkmod: Use kernel
decompression when available")) using the kernel decompressor, when
loading compressed modules.
However, the kernel XZ decompressor is XZ Embedded, which doesn't
handle CRC64 and dictionaries larger than 1MiB.
Use CRC32 and 1MiB dictionary when XZ compressing and installing
kernel modules.
Link: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1050582
Signed-off-by: Martin Nybo Andersen <tweek@tweek.dk>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---
scripts/Makefile.modinst | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/scripts/Makefile.modinst b/scripts/Makefile.modinst
index 346f5ec506823..0afd75472679f 100644
--- a/scripts/Makefile.modinst
+++ b/scripts/Makefile.modinst
@@ -144,7 +144,7 @@ endif
quiet_cmd_gzip = GZIP $@
cmd_gzip = $(KGZIP) -n -f $<
quiet_cmd_xz = XZ $@
- cmd_xz = $(XZ) --lzma2=dict=2MiB -f $<
+ cmd_xz = $(XZ) --check=crc32 --lzma2=dict=1MiB -f $<
quiet_cmd_zstd = ZSTD $@
cmd_zstd = $(ZSTD) -T0 --rm -f -q $<
--
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