The new version of zstd library integrated in the kernel since v6.2-rc1 https://lore.kernel.org/all/20221024202606.404049-1-nickrterrell@xxxxxxxxx/ contains commit https://github.com/facebook/zstd/commit/6a7ede3dfccb which introduces a side effect for historical usage of __decompress() function, i.e. not specifying "out_len" parameter and expecting that no writes beyond uncompressed kernel image are performed. More details are in follow up fix. >From architectures which claim HAVE_KERNEL_ZSTD, s390 and MIPS use __decompress() without specifying "out_len". On s390 this leads to initrd corruption. https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2003348 I haven't looked in details for MIPS but I've added Thomas as the maintainer and MIPS list in Cc. The follow up fix addresses that for s390. Vasily Gorbik (1): s390/decompressor: specify __decompress() buf len to avoid overflow arch/s390/boot/decompressor.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) -- 2.38.1
