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| author | Kumar Kartikeya Dwivedi <memxor@gmail.com> | 2023-09-13 01:31:58 +0200 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2023-09-16 18:34:20 +0200 |
| commit | 9af27da6313c8f8c6a26c7ea3fe23d6b9664a3a8 (patch) | |
| tree | b050806b2b9c2ef6ae0fd7945b7698d492b6affd /include | |
| parent | Merge branch 'arm32-bpf-add-support-for-cpuv4-insns' (diff) | |
| download | linux-9af27da6313c8f8c6a26c7ea3fe23d6b9664a3a8.tar.xz linux-9af27da6313c8f8c6a26c7ea3fe23d6b9664a3a8.zip | |
bpf: Use bpf_is_subprog to check for subprogs
We would like to know whether a bpf_prog corresponds to the main prog or
one of the subprogs. The current JIT implementations simply check this
using the func_idx in bpf_prog->aux->func_idx. When the index is 0, it
belongs to the main program, otherwise it corresponds to some
subprogram.
This will also be necessary to halt exception propagation while walking
the stack when an exception is thrown, so we add a simple helper
function to check this, named bpf_is_subprog, and convert existing JIT
implementations to also make use of it.
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20230912233214.1518551-2-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/bpf.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/bpf.h b/include/linux/bpf.h index b9e573159432..9171b0b6a590 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -3194,4 +3194,9 @@ static inline gfp_t bpf_memcg_flags(gfp_t flags) return flags; } +static inline bool bpf_is_subprog(const struct bpf_prog *prog) +{ + return prog->aux->func_idx != 0; +} + #endif /* _LINUX_BPF_H */ |