linux-kernel - [PATCH] Use CRC32 and a 1MiB dictionary for XZ compressed modules

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Date:   Fri, 15 Sep 2023 12:15:39 +0200 (CEST)
From:   Martin Nybo Andersen <tweek@...ek.dk>
To:     Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>,
        Nick Terrell <terrelln@...com>, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org
cc:     tweek@...ek.dk
Subject: [PATCH] Use CRC32 and a 1MiB dictionary for XZ compressed modules

Kmod is now using the kernel decompressor which doesn't handle CRC64
and dictionaries larger than 1MiB.

Fixes: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1050582
Signed-off-by: Martin Nybo Andersen <tweek@...ek.dk>
---
  scripts/Makefile.modinst | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/Makefile.modinst b/scripts/Makefile.modinst
index c59cc57286ba..ffbafbd3aeea 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 $<

--
2.40.1