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fdfd9d82a4
Philo Lu says:
====================
This makes bpf_dynptr_from_skb usable for tp_btf, so that we can easily
parse skb in tracepoints. This has been discussed in [0], and Martin
suggested to use dynptr (instead of helpers like bpf_skb_load_bytes).
For safety, skb dynptr shouldn't be used in fentry/fexit. This is achieved
by add KF_TRUSTED_ARGS flag in bpf_dynptr_from_skb defination, because
pointers passed by tracepoint are trusted (PTR_TRUSTED) while those of
fentry/fexit are not.
Another problem raises that NULL pointers could be passed to tracepoint,
such as trace_tcp_send_reset, and we need to recognize them. This is done
by add a "__nullable" suffix in the func_proto of the tracepoint,
discussed in [1].
2 Test cases are added, one for "__nullable" suffix, and the other for
using skb dynptr in tp_btf.
changelog
v2 -> v3 (Andrii Nakryiko):
Patch 1:
- Remove prog type check in prog_arg_maybe_null()
- Add bpf_put_raw_tracepoint() after get()
- Use kallsyms_lookup() instead of sprintf("%ps")
Patch 2: Add separate test "tp_btf_nullable", and use full failure msg
v1 -> v2:
- Add "__nullable" suffix support (Alexei Starovoitov)
- Replace "struct __sk_buff*" with "void*" in test (Martin KaFai Lau)
[0]
https://lore.kernel.org/all/20240205121038.41344-1-lulie@linux.alibaba.com/T/
[1]
https://lore.kernel.org/all/20240430121805.104618-1-lulie@linux.alibaba.com/T/
====================
Signed-off-by: Martin KaFai Lau <martin.lau@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 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.