Description (CNA)
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``.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected ab749badf9f41f32509cd103391b81ea7e684b76 before 4d53a625f29074e7b8236c2c0e0922edb7608df9; affected ab749badf9f41f32509cd103391b81ea7e684b76 before 6b59e1907f58cf877c563dcf013159eb9f994b64; affected ab749badf9f41f32509cd103391b81ea7e684b76 before dcbe6803fffd387f72b48c2373b5f5ed12a5804b |
| Linux / Linux | affected 5.17; unaffected 0 before 5.17; unaffected 5.17.14 through 5.17.*; unaffected 5.18.3 through 5.18.*; unaffected 5.19 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/4d53a625f29074e7b8236c2c0e0922edb7608df9
- https://git.kernel.org/stable/c/6b59e1907f58cf877c563dcf013159eb9f994b64
- https://git.kernel.org/stable/c/dcbe6803fffd387f72b48c2373b5f5ed12a5804b
ADP enrichment
No English description supplied.
No references supplied.