bpf: Add a kfunc for generic type cast

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Implement bpf_rdonly_cast() which tries to cast the object
to a specified type. This tries to support use case like below:
  #define skb_shinfo(SKB) ((struct skb_shared_info *)(skb_end_pointer(SKB)))
where skb_end_pointer(SKB) is a 'unsigned char *' and needs to
be casted to 'struct skb_shared_info *'.

The signature of bpf_rdonly_cast() looks like
   void *bpf_rdonly_cast(void *obj, __u32 btf_id)
The function returns the same 'obj' but with PTR_TO_BTF_ID with
btf_id. The verifier will ensure btf_id being a struct type.

Since the supported type cast may not reflect what the 'obj'
represents, the returned btf_id is marked as PTR_UNTRUSTED, so
the return value and subsequent pointer chasing cannot be
used as helper/kfunc arguments.

Signed-off-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/r/20221120195437.3114585-1-yhs@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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This commit is contained in:

Yonghong Song 2022-11-20 11:54:37 -08:00 • committed by Alexei Starovoitov

parent fd264ca020

commit a35b9af4ec

2 changed files with 24 additions and 2 deletions

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6

kernel/bpf/helpers.c

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20

kernel/bpf/verifier.c

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