bpf: allow any program to use the bpf_map_sum_elem_count kfunc

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Register the bpf_map_sum_elem_count func for all programs, and update the
map_ptr subtest of the test_progs test to test the new functionality.

The usage is allowed as long as the pointer to the map is trusted (when
using tracing programs) or is a const pointer to map, as in the following
example:

    struct {
            __uint(type, BPF_MAP_TYPE_HASH);
            ...
    } hash SEC(".maps");

    ...

    static inline int some_bpf_prog(void)
    {
            struct bpf_map *map = (struct bpf_map *)&hash;
            __s64 count;

            count = bpf_map_sum_elem_count(map);

            ...
    }

Signed-off-by: Anton Protopopov <aspsk@isovalent.com>
Link: https://lore.kernel.org/r/20230719092952.41202-5-aspsk@isovalent.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

...

This commit is contained in:

Anton Protopopov 2023-07-19 09:29:52 +00:00 • committed by Alexei Starovoitov

parent 9c29804961

commit 72829b1c1f

2 changed files with 6 additions and 1 deletions

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2

kernel/bpf/map_iter.c

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5

tools/testing/selftests/bpf/progs/map_ptr_kern.c

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