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| author | Zhihao Cheng <chengzhihao1@huawei.com> | 2022-07-30 14:28:37 +0300 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2023-02-02 23:13:50 +0300 |
| commit | a240bc5c43130c6aa50831d7caaa02a1d84e1bce (patch) | |
| tree | c4c6475c1b57f85d20de3a1dcdc367e7ede0eae5 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | 76f9476ece445a07aeb72df9d896cd563fb5b50f (diff) | |
| download | linux-a240bc5c43130c6aa50831d7caaa02a1d84e1bce.tar.xz | |
ubi: Fix UAF wear-leveling entry in eraseblk_count_seq_show()
Wear-leveling entry could be freed in error path, which may be accessed
again in eraseblk_count_seq_show(), for example:
__erase_worker eraseblk_count_seq_show
wl = ubi->lookuptbl[*block_number]
if (wl)
wl_entry_destroy
ubi->lookuptbl[e->pnum] = NULL
kmem_cache_free(ubi_wl_entry_slab, e)
erase_count = wl->ec // UAF!
Wear-leveling entry updating/accessing in ubi->lookuptbl should be
protected by ubi->wl_lock, fix it by adding ubi->wl_lock to serialize
wl entry accessing between wl_entry_destroy() and
eraseblk_count_seq_show().
Fetch a reproducer in [Link].
Link: https://bugzilla.kernel.org/show_bug.cgi?id=216305
Fixes: 7bccd12d27b7e3 ("ubi: Add debugfs file for tracking PEB state")
Fixes: 801c135ce73d5d ("UBI: Unsorted Block Images")
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions