TWx Linux Repository
a82dc19db1
netdev_get_by_index_lock() performs following steps: rcu_lock(); dev = lookup(netns, ifindex); dev_get(dev); rcu_unlock(); [... lock & validate the dev ...] return dev Validation right now only checks if the device is registered but since the lookup is netns-aware we must also protect against the device switching netns right after we dropped the RCU lock. Otherwise the caller in netns1 may get a pointer to a device which has just switched to netns2. We can't hold the lock for the entire netns change process (because of the NETDEV_UNREGISTER notifier), and there's no existing marking to indicate that the netns is unlisted because of netns move, so add one. AFAIU none of the existing netdev_get_by_index_lock() callers can suffer from this problem (NAPI code double checks the netns membership and other callers are either under rtnl_lock or not ns-sensitive), so this patch does not have to be treated as a fix. Reviewed-by: Joe Damato <jdamato@fastly.com> Acked-by: Stanislav Fomichev <sdf@fomichev.me> Link: https://patch.msgid.link/20250408195956.412733-2-kuba@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
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| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.