erofs: fix uninitialized page cache reported by KMSAN
syzbot reports a KMSAN reproducer [1] which generates a crafted filesystem image and causes IMA to read uninitialized page cache. Later, (rq->outputsize > rq->inputsize) will be formally supported after either large uncompressed pclusters (> block size) or big lclusters are landed. However, currently there is no way to generate such filesystems by using mkfs.erofs. Thus, let's mark this condition as unsupported for now. [1] https://lore.kernel.org/r/0000000000002be12a0611ca7ff8@google.com Reported-and-tested-by:<syzbot+7bc44a489f0ef0670bd5@syzkaller.appspotmail.com> Fixes: 1ca01520 ("erofs: refine z_erofs_transform_plain() for sub-page block support") Reviewed-by:
Sandeep Dhavale <dhavale@google.com> Reviewed-by:
Yue Hu <huyue2@coolpad.com> Reviewed-by:
Chao Yu <chao@kernel.org> Signed-off-by:
Gao Xiang <hsiangkao@linux.alibaba.com> Link: https://lore.kernel.org/r/20240304035339.425857-1-hsiangkao@linux.alibaba.com
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