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John Fastabend says: ==================== Fix a splat introduced by recent changes to avoid skipping ingress policy when kTLS is enabled. The RCU splat was introduced because in the non-TLS case the caller is wrapped in an rcu_read_lock/unlock. But, in the TLS case we have a reference to the psock and the caller did not wrap its call in rcu_read_lock/unlock. To fix extend the RCU section to include the redirect case which was missed. From v1->v2 I changed the location a bit to simplify the code some. See patch 1. But, then Martin asked why it was not needed in the non-TLS case. The answer for patch 1 was, as stated above, because the caller has the rcu read lock. However, there was still a missing case where a BPF user could in-theory line up a set of parameters to hit a case where the code was entered from strparser side from a different context then the initial caller. To hit this user would need a parser program to return value greater than skb->len then an ENOMEM error could happen in the strparser codepath triggering strparser to retry from a workqueue and without rcu_read_lock original caller used. See patch 2 for details. Finally, we don't actually have any selftests for parser returning a value geater than skb->len so add one in patch 3. This is especially needed because at least I don't have any code that uses the parser to return value greater than skb->len. So I wouldn't have caught any errors here in my own testing. Thanks, John v1->v2: simplify code in patch 1 some and add patches 2 and 3. ==================== Signed-off-by: Alexei Starovoitov <ast@kernel.org> |
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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 Restructured Text 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.