linux/net/Kconfig.debug, branch v6.0Mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/
https://git.shady.money/linux/atom?h=v6.02022-06-02T17:15:05Znet: CONFIG_DEBUG_NET depends on CONFIG_NET2022-06-02T17:15:05ZEric Dumazetedumazet@google.com2022-06-02T16:18:57Zurn:sha1:eb0b39efb7d908e3950f6f76ee6e3cecb86ec489
It makes little sense to debug networking stacks
if networking is not compiled in.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
net: add CONFIG_DEBUG_NET2022-05-11T11:43:10ZEric Dumazetedumazet@google.com2022-05-10T03:57:38Zurn:sha1:d268c1f5cfc92eb5bb605f7365769aacd93be234
This config option enables network debugging checks.
This patch adds DEBUG_NET_WARN_ON_ONCE(cond)
Note that this is not a replacement for WARN_ON_ONCE(cond)
as (cond) is not evaluated if CONFIG_DEBUG_NET is not set.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net: add networking namespace refcount tracker2021-12-10T14:38:26ZEric Dumazetedumazet@google.com2021-12-10T07:44:21Zurn:sha1:9ba74e6c9e9d0c5c1e5792a7111fc7d1a0589cb8
We have 100+ syzbot reports about netns being dismantled too soon,
still unresolved as of today.
We think a missing get_net() or an extra put_net() is the root cause.
In order to find the bug(s), and be able to spot future ones,
this patch adds CONFIG_NET_NS_REFCNT_TRACKER and new helpers
to precisely pair all put_net() with corresponding get_net().
To use these helpers, each data structure owning a refcount
should also use a "netns_tracker" to pair the get and put.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
net: add net device refcount tracker infrastructure2021-12-07T00:05:07ZEric Dumazetedumazet@google.com2021-12-05T04:21:57Zurn:sha1:4d92b95ff2f95f13df9bad0b5a25a9f60e72758d
net device are refcounted. Over the years we had numerous bugs
caused by imbalanced dev_hold() and dev_put() calls.
The general idea is to be able to precisely pair each decrement with
a corresponding prior increment. Both share a cookie, basically
a pointer to private data storing stack traces.
This patch adds dev_hold_track() and dev_put_track().
To use these helpers, each data structure owning a refcount
should also use a "netdevice_tracker" to pair the hold and put.
netdevice_tracker dev_tracker;
...
dev_hold_track(dev, &dev_tracker, GFP_ATOMIC);
...
dev_put_track(dev, &dev_tracker);
Whenever a leak happens, we will get precise stack traces
of the point dev_hold_track() happened, at device dismantle phase.
We will also get a stack trace if too many dev_put_track() for the same
netdevice_tracker are attempted.
This is guarded by CONFIG_NET_DEV_REFCNT_TRACKER option.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>