| Message ID | 20210110070341.1380086-1-andrii@kernel.org |
|---|---|
| State | New |
| Headers | show |
| Series | [bpf,1/2] bpf: allow empty module BTFs | expand |
On 1/9/21 11:03 PM, Andrii Nakryiko wrote: > Some modules don't declare any new types and end up with an empty BTF, > containing only valid BTF header and no types or strings sections. This > currently causes BTF validation error. There is nothing wrong with such BTF, > so fix the issue by allowing module BTFs with no types or strings. > > Reported-by: Christopher William Snowhill <chris@kode54.net> > Fixes: 36e68442d1af ("bpf: Load and verify kernel module BTFs") > Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Yonghong Song <yhs@fb.com>
Hello: This series was applied to bpf/bpf.git (refs/heads/master): On Sat, 9 Jan 2021 23:03:40 -0800 you wrote: > Some modules don't declare any new types and end up with an empty BTF, > containing only valid BTF header and no types or strings sections. This > currently causes BTF validation error. There is nothing wrong with such BTF, > so fix the issue by allowing module BTFs with no types or strings. > > Reported-by: Christopher William Snowhill <chris@kode54.net> > Fixes: 36e68442d1af ("bpf: Load and verify kernel module BTFs") > Signed-off-by: Andrii Nakryiko <andrii@kernel.org> > > [...] Here is the summary with links: - [bpf,1/2] bpf: allow empty module BTFs https://git.kernel.org/bpf/bpf/c/bcc5e6162d66 - [bpf,2/2] libbpf: allow loading empty BTFs https://git.kernel.org/bpf/bpf/c/b8d52264df85 You are awesome, thank you! -- Deet-doot-dot, I am a bot. https://korg.docs.kernel.org/patchwork/pwbot.html
When is this being applied to an actual kernel? 5.11 is still quite broken without these two patches. Unless you're not using a vfat EFI partition, I guess. On Tue, Jan 12, 2021, at 12:20 PM, patchwork-bot+netdevbpf@kernel.org wrote: > Hello: > > This series was applied to bpf/bpf.git (refs/heads/master): > > On Sat, 9 Jan 2021 23:03:40 -0800 you wrote: > > Some modules don't declare any new types and end up with an empty BTF, > > containing only valid BTF header and no types or strings sections. This > > currently causes BTF validation error. There is nothing wrong with such BTF, > > so fix the issue by allowing module BTFs with no types or strings. > > > > Reported-by: Christopher William Snowhill <chris@kode54.net> > > Fixes: 36e68442d1af ("bpf: Load and verify kernel module BTFs") > > Signed-off-by: Andrii Nakryiko <andrii@kernel.org> > > > > [...] > > Here is the summary with links: > - [bpf,1/2] bpf: allow empty module BTFs > https://git.kernel.org/bpf/bpf/c/bcc5e6162d66 > - [bpf,2/2] libbpf: allow loading empty BTFs > https://git.kernel.org/bpf/bpf/c/b8d52264df85 > > You are awesome, thank you! > -- > Deet-doot-dot, I am a bot. > https://korg.docs.kernel.org/patchwork/pwbot.html > > >
On Sun, Jan 24, 2021 at 2:28 AM Christopher William Snowhill <chris@kode54.net> wrote: > > When is this being applied to an actual kernel? 5.11 is still quite broken without these two patches. Unless you're not using a vfat EFI partition, I guess. > It's in v5.11-rc5. > On Tue, Jan 12, 2021, at 12:20 PM, patchwork-bot+netdevbpf@kernel.org wrote: > > Hello: > > > > This series was applied to bpf/bpf.git (refs/heads/master): > > > > On Sat, 9 Jan 2021 23:03:40 -0800 you wrote: > > > Some modules don't declare any new types and end up with an empty BTF, > > > containing only valid BTF header and no types or strings sections. This > > > currently causes BTF validation error. There is nothing wrong with such BTF, > > > so fix the issue by allowing module BTFs with no types or strings. > > > > > > Reported-by: Christopher William Snowhill <chris@kode54.net> > > > Fixes: 36e68442d1af ("bpf: Load and verify kernel module BTFs") > > > Signed-off-by: Andrii Nakryiko <andrii@kernel.org> > > > > > > [...] > > > > Here is the summary with links: > > - [bpf,1/2] bpf: allow empty module BTFs > > https://git.kernel.org/bpf/bpf/c/bcc5e6162d66 > > - [bpf,2/2] libbpf: allow loading empty BTFs > > https://git.kernel.org/bpf/bpf/c/b8d52264df85 > > > > You are awesome, thank you! > > -- > > Deet-doot-dot, I am a bot. > > https://korg.docs.kernel.org/patchwork/pwbot.html > > > > > >
Aha, that was just released. Nice. I'll report this to the issue tracker where I had lodged the bpf patches for QoL use when testing rc4 and older. On Mon, Jan 25, 2021, at 5:26 PM, Andrii Nakryiko wrote: > On Sun, Jan 24, 2021 at 2:28 AM Christopher William Snowhill > <chris@kode54.net> wrote: > > > > When is this being applied to an actual kernel? 5.11 is still quite broken without these two patches. Unless you're not using a vfat EFI partition, I guess. > > > > It's in v5.11-rc5. > > > On Tue, Jan 12, 2021, at 12:20 PM, patchwork-bot+netdevbpf@kernel.org wrote: > > > Hello: > > > > > > This series was applied to bpf/bpf.git (refs/heads/master): > > > > > > On Sat, 9 Jan 2021 23:03:40 -0800 you wrote: > > > > Some modules don't declare any new types and end up with an empty BTF, > > > > containing only valid BTF header and no types or strings sections. This > > > > currently causes BTF validation error. There is nothing wrong with such BTF, > > > > so fix the issue by allowing module BTFs with no types or strings. > > > > > > > > Reported-by: Christopher William Snowhill <chris@kode54.net> > > > > Fixes: 36e68442d1af ("bpf: Load and verify kernel module BTFs") > > > > Signed-off-by: Andrii Nakryiko <andrii@kernel.org> > > > > > > > > [...] > > > > > > Here is the summary with links: > > > - [bpf,1/2] bpf: allow empty module BTFs > > > https://git.kernel.org/bpf/bpf/c/bcc5e6162d66 > > > - [bpf,2/2] libbpf: allow loading empty BTFs > > > https://git.kernel.org/bpf/bpf/c/b8d52264df85 > > > > > > You are awesome, thank you! > > > -- > > > Deet-doot-dot, I am a bot. > > > https://korg.docs.kernel.org/patchwork/pwbot.html > > > > > > > > > >
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 8d6bdb4f4d61..84a36ee4a4c2 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -4172,7 +4172,7 @@ static int btf_parse_hdr(struct btf_verifier_env *env) return -ENOTSUPP; } - if (btf_data_size == hdr->hdr_len) { + if (!btf->base_btf && btf_data_size == hdr->hdr_len) { btf_verifier_log(env, "No data"); return -EINVAL; }
Some modules don't declare any new types and end up with an empty BTF, containing only valid BTF header and no types or strings sections. This currently causes BTF validation error. There is nothing wrong with such BTF, so fix the issue by allowing module BTFs with no types or strings. Reported-by: Christopher William Snowhill <chris@kode54.net> Fixes: 36e68442d1af ("bpf: Load and verify kernel module BTFs") Signed-off-by: Andrii Nakryiko <andrii@kernel.org> --- kernel/bpf/btf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)