Vulnerability Details CVE-2022-49464
In the Linux kernel, the following vulnerability has been resolved:
erofs: fix buffer copy overflow of ztailpacking feature
I got some KASAN report as below:
[ 46.959738] ==================================================================
[ 46.960430] BUG: KASAN: use-after-free in z_erofs_shifted_transform+0x2bd/0x370
[ 46.960430] Read of size 4074 at addr ffff8880300c2f8e by task fssum/188
...
[ 46.960430] Call Trace:
[ 46.960430] <TASK>
[ 46.960430] dump_stack_lvl+0x41/0x5e
[ 46.960430] print_report.cold+0xb2/0x6b7
[ 46.960430] ? z_erofs_shifted_transform+0x2bd/0x370
[ 46.960430] kasan_report+0x8a/0x140
[ 46.960430] ? z_erofs_shifted_transform+0x2bd/0x370
[ 46.960430] kasan_check_range+0x14d/0x1d0
[ 46.960430] memcpy+0x20/0x60
[ 46.960430] z_erofs_shifted_transform+0x2bd/0x370
[ 46.960430] z_erofs_decompress_pcluster+0xaae/0x1080
The root cause is that the tail pcluster won't be a complete filesystem
block anymore. So if ztailpacking is used, the second part of an
uncompressed tail pcluster may not be ``rq->pageofs_out``.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 7.3%
CVSS Severity
CVSS v3 Score 7.8
References
Products affected by CVE-2022-49464
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cpe:2.3:o:linux:linux_kernel:5.17
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cpe:2.3:o:linux:linux_kernel:5.17.1
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cpe:2.3:o:linux:linux_kernel:5.17.10
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cpe:2.3:o:linux:linux_kernel:5.17.11
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cpe:2.3:o:linux:linux_kernel:5.17.12
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cpe:2.3:o:linux:linux_kernel:5.17.13
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cpe:2.3:o:linux:linux_kernel:5.17.2
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cpe:2.3:o:linux:linux_kernel:5.17.3
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cpe:2.3:o:linux:linux_kernel:5.17.4
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cpe:2.3:o:linux:linux_kernel:5.17.5
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cpe:2.3:o:linux:linux_kernel:5.17.6
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cpe:2.3:o:linux:linux_kernel:5.17.7
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cpe:2.3:o:linux:linux_kernel:5.17.8
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cpe:2.3:o:linux:linux_kernel:5.17.9
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cpe:2.3:o:linux:linux_kernel:5.18
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cpe:2.3:o:linux:linux_kernel:5.18.1
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cpe:2.3:o:linux:linux_kernel:5.18.2