On 8/24/20 5:05 PM, Hao Luo wrote:
Yonghong,
An update on this thread. I successfully reproduced this issue on a
8.2.0 gcc compiler, It looks like gcc 4.9 did not have this issue. I
was also using clang which did not show this bug.
It seems having a DW_AT_specification that refers to
Yonghong,
An update on this thread. I successfully reproduced this issue on a
8.2.0 gcc compiler, It looks like gcc 4.9 did not have this issue. I
was also using clang which did not show this bug.
It seems having a DW_AT_specification that refers to another
DW_TAG_variable isn't handled in
On Thu, Aug 20, 2020 at 2:53 PM Alexei Starovoitov
wrote:
>
> Why did you choose to do it during main do_check() walk instead of this
> pre-pass ?
> check_ld_imm() can be called multiple times for the same insn,
> so it's faster and less surprising to do it during
>
On Wed, Aug 19, 2020 at 03:40:23PM -0700, Hao Luo wrote:
> +
> /* verify BPF_LD_IMM64 instruction */
> static int check_ld_imm(struct bpf_verifier_env *env, struct bpf_insn *insn)
> {
> @@ -7234,6 +7296,9 @@ static int check_ld_imm(struct bpf_verifier_env *env,
> struct bpf_insn *insn)
>
Yonghong,
Thank you for taking a look. Explicitly cc'ing Arnaldo to see if he
has any immediate insights. In the meantime, I'll dedicate time to
investigate this issue you found.
Thanks,
Hao
On Thu, Aug 20, 2020 at 8:23 AM Yonghong Song wrote:
>
>
>
> On 8/19/20 3:40 PM, Hao Luo wrote:
> >
On 8/19/20 3:40 PM, Hao Luo wrote:
Pseudo_btf_id is a type of ld_imm insn that associates a btf_id to a
ksym so that further dereferences on the ksym can use the BTF info
to validate accesses. Internally, when seeing a pseudo_btf_id ld insn,
the verifier reads the btf_id stored in the
On 8/19/20 3:40 PM, Hao Luo wrote:
Pseudo_btf_id is a type of ld_imm insn that associates a btf_id to a
ksym so that further dereferences on the ksym can use the BTF info
to validate accesses. Internally, when seeing a pseudo_btf_id ld insn,
the verifier reads the btf_id stored in the
Pseudo_btf_id is a type of ld_imm insn that associates a btf_id to a
ksym so that further dereferences on the ksym can use the BTF info
to validate accesses. Internally, when seeing a pseudo_btf_id ld insn,
the verifier reads the btf_id stored in the insn[0]'s imm field and
marks the dst_reg as
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