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| author | Gao Xiang <hsiangkao@linux.alibaba.com> | 2024-03-04 04:53:39 +0100 |
|---|---|---|
| committer | Gao Xiang <hsiangkao@linux.alibaba.com> | 2024-03-07 03:21:00 +0100 |
| commit | 893e5e9b7369a02e7ceaa6d98db6739162005b03 (patch) | |
| tree | ba940e04acedfc268fbf41548dc388965faa22a1 /fs/erofs/data.c | |
| parent | Linux 6.8-rc7 (diff) | |
| download | linux-893e5e9b7369a02e7ceaa6d98db6739162005b03.tar.xz linux-893e5e9b7369a02e7ceaa6d98db6739162005b03.zip | |
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: 1ca01520148a ("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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