Re: [PATCH 6.6 00/28] fix CVE-2024-46701

[Lorenzo Stoakes <lorenzo.stoakes@oracle.com>]

NACK.

Do this some other way that isn't a terrible mess.

You've reverted my CRITICAL fix, then didn't cc- me so I'm grumpy.

Even if you bizarrely brought it back later.

Don't fail to cc- people you revert in future, please, especially in
stable. It's not only discourteous it's also an actual security risk.

Thanks.

Also this commit log is ridiculous, you don't even explain WHAT ON EARTH
YOU ARE DOING HERE. It's not just good enough to reference a CVE and expect
us to go research this for you, especially one you've 'addressed' in this
totally bizarre fashion.

On Thu, Oct 24, 2024 at 09:19:41PM +0800, Yu Kuai wrote:
> From: Yu Kuai <yukuai3@huawei.com>
>
> Fix patch is patch 27, relied patches are from:
>
>  - patches from set [1] to add helpers to maple_tree, the last patch to
> improve fork() performance is not backported;
>  - patches from set [2] to change maple_tree, and follow up fixes;
>  - patches from set [3] to convert offset_ctx from xarray to maple_tree;
>
> Please notice that I'm not an expert in this area, and I'm afraid to
> make manual changes. That's why patch 16 revert the commit that is
> different from mainline and will cause conflict backporting new patches.
> patch 28 pick the original mainline patch again.

This is... what? :/

You have to fix conflicts, that's part of what backporting involves.

Yeah, rethink your whole approach, thanks.

>
> (And this is what we did to fix the CVE in downstream kernels).
>
> [1] https://lore.kernel.org/all/20231027033845.90608-1-zhangpeng.00@bytedance.com/
> [2] https://lore.kernel.org/all/20231101171629.3612299-2-Liam.Howlett@oracle.com/T/
> [3] https://lore.kernel.org/all/170820083431.6328.16233178852085891453.stgit@91.116.238.104.host.secureserver.net/
>
> Andrew Morton (1):
>   lib/maple_tree.c: fix build error due to hotfix alteration
>
> Chuck Lever (5):
>   libfs: Re-arrange locking in offset_iterate_dir()
>   libfs: Define a minimum directory offset
>   libfs: Add simple_offset_empty()
>   maple_tree: Add mtree_alloc_cyclic()
>   libfs: Convert simple directory offsets to use a Maple Tree
>
> Liam R. Howlett (12):
>   maple_tree: remove unnecessary default labels from switch statements
>   maple_tree: make mas_erase() more robust
>   maple_tree: move debug check to __mas_set_range()
>   maple_tree: add end of node tracking to the maple state
>   maple_tree: use cached node end in mas_next()
>   maple_tree: use cached node end in mas_destroy()
>   maple_tree: clean up inlines for some functions
>   maple_tree: separate ma_state node from status
>   maple_tree: remove mas_searchable()
>   maple_tree: use maple state end for write operations
>   maple_tree: don't find node end in mtree_lookup_walk()
>   maple_tree: mtree_range_walk() clean up
>
> Lorenzo Stoakes (1):
>   maple_tree: correct tree corruption on spanning store
>
> Peng Zhang (7):
>   maple_tree: add mt_free_one() and mt_attr() helpers
>   maple_tree: introduce {mtree,mas}_lock_nested()
>   maple_tree: introduce interfaces __mt_dup() and mtree_dup()
>   maple_tree: skip other tests when BENCH is enabled
>   maple_tree: preserve the tree attributes when destroying maple tree
>   maple_tree: add test for mtree_dup()
>   maple_tree: avoid checking other gaps after getting the largest gap
>
> Yu Kuai (1):
>   Revert "maple_tree: correct tree corruption on spanning store"
>
> yangerkun (1):
>   libfs: fix infinite directory reads for offset dir
>
>  fs/libfs.c                                  |  129 ++-
>  include/linux/fs.h                          |    6 +-
>  include/linux/maple_tree.h                  |  356 +++---
>  include/linux/mm_types.h                    |    3 +-
>  lib/maple_tree.c                            | 1096 +++++++++++++------
>  lib/test_maple_tree.c                       |  218 ++--
>  mm/internal.h                               |   10 +-
>  mm/shmem.c                                  |    4 +-
>  tools/include/linux/spinlock.h              |    1 +
>  tools/testing/radix-tree/linux/maple_tree.h |    2 +-
>  tools/testing/radix-tree/maple.c            |  390 ++++++-
>  11 files changed, 1564 insertions(+), 651 deletions(-)
>
> --
> 2.39.2
>