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| author |   Joanne Koong <joannelkoong@gmail.com> | 2022-05-23 14:07:08 -0700 |
|---|---|---|
| committer |   Andrii Nakryiko <andrii@kernel.org> | 2022-05-23 14:31:24 -0700 |
| commit | 263ae152e96253f40c2c276faad8629e096b3bad (patch) | |
| tree | 85bd51d3eaedd4ea9e10f886f7c2d145d3f25246 /kernel/bpf/verifier.c | |
| parent | bpf: Add verifier support for dynptrs (diff) | |
| download | linux-dev-263ae152e96253f40c2c276faad8629e096b3bad.tar.xz linux-dev-263ae152e96253f40c2c276faad8629e096b3bad.zip | |
bpf: Add bpf_dynptr_from_mem for local dynptrs
This patch adds a new api bpf_dynptr_from_mem:
long bpf_dynptr_from_mem(void *data, u32 size, u64 flags, struct bpf_dynptr *ptr);
which initializes a dynptr to point to a bpf program's local memory. For now
only local memory that is of reg type PTR_TO_MAP_VALUE is supported.
Signed-off-by: Joanne Koong <joannelkoong@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220523210712.3641569-3-joannelkoong@gmail.com
Diffstat (limited to 'kernel/bpf/verifier.c')
| -rw-r--r-- | kernel/bpf/verifier.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 1fd0b81c3fec..b657d46f886e 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -7204,6 +7204,12 @@ static int check_helper_call(struct bpf_verifier_env *env, struct bpf_insn *insn err = __check_func_call(env, insn, insn_idx_p, meta.subprogno, set_loop_callback_state); break; + case BPF_FUNC_dynptr_from_mem: + if (regs[BPF_REG_1].type != PTR_TO_MAP_VALUE) { + verbose(env, "Unsupported reg type %s for bpf_dynptr_from_mem data\n", + reg_type_str(env, regs[BPF_REG_1].type)); + return -EACCES; + } } if (err) |