Messages in this thread | | | Date | Thu, 16 Jun 2022 05:27:04 +0800 | Subject | Re: [syzbot] KASAN: use-after-free Read in copy_page_from_iter_atomic (2) | From | Qu Wenruo <> |
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On 2022/6/15 21:21, Christoph Hellwig wrote: > On Tue, Jun 14, 2022 at 04:50:22PM +0800, Qu Wenruo wrote: >> The same way as data? >> >> map-logical to find the location of a mirror, write 4 bytes of zero into >> the location, then call it a day. >> >> Although for metadata, you may want to choose a metadata that would >> definitely get read. >> Thus tree root is a good candidate. > > And how do I find out the logic address of the tree root?
For tree root, "btrfs ins dump-super <dev> | grep '^root\s'.
For other tree blocks, "btrfs ins dump-tree <dev>" then with other other keywords to grab.
Thanks, Qu
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