[PATCH 0/5] cachefiles: some bugfixes for withdraw and xattr

[Baokun Li]

Hi David,
Hi Jeff,

Could you please take time to take a look at this series?  I'd 
appreciated it
if I could get some feedback and comments.

Thanks,
Baokun

On 2024/4/24 11:27, libaokun at huaweicloud.com wrote:
> From: Baokun Li <libaokun1 at huawei.com>
>
> Hello everyone!
>
> Recently we found some bugs while doing tests on cachefiles ondemand mode,
> and this patchset is a fix for some of those issues. The following is a
> brief overview of the patches, see the patches for more details.
>
> Patch 1-2: Add fscache_try_get_volume() helper function to avoid
> fscache_volume use-after-free on cache withdrawal.
>
> Patch 3: Fix cachefiles_lookup_cookie() and cachefiles_withdraw_cache()
> concurrency causing cachefiles_volume use-after-free.
>
> Patch 4-5: Propagate error codes returned by vfs_getxattr() to avoid
> endless loops.
>
> Comments and questions are, as always, welcome.
>
> Thanks,
> Baokun
>
> Baokun Li (5):
>    netfs, fscache: export fscache_put_volume() and add
>      fscache_try_get_volume()
>    cachefiles: fix slab-use-after-free in fscache_withdraw_volume()
>    cachefiles: fix slab-use-after-free in cachefiles_withdraw_cookie()
>    cachefiles: correct the return value of
>      cachefiles_check_volume_xattr()
>    cachefiles: correct the return value of cachefiles_check_auxdata()
>
>   fs/cachefiles/cache.c          | 45 +++++++++++++++++++++++++++++++++-
>   fs/cachefiles/volume.c         |  1 -
>   fs/cachefiles/xattr.c          |  5 +++-
>   fs/netfs/fscache_volume.c      | 14 +++++++++++
>   fs/netfs/internal.h            |  2 --
>   include/linux/fscache-cache.h  |  6 +++++
>   include/trace/events/fscache.h |  4 +++
>   7 files changed, 72 insertions(+), 5 deletions(-)
>