diff mbox series

[bpf-next,v2,2/2] selftests/bpf: Add tests for ldsx of pkt data/data_end/data_meta accesses

Message ID 20240718050228.3543663-1-yonghong.song@linux.dev (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series [bpf-next,v2,1/2] bpf: Fail verification for sign-extension of packet data/data_end/data_meta | expand

Checks

Context Check Description
netdev/series_format success Single patches do not need cover letters
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 7 this patch: 7
netdev/build_tools success Errors and warnings before: 0 this patch: 0
netdev/cc_maintainers warning 15 maintainers not CCed: kpsingh@kernel.org shuah@kernel.org haoluo@google.com hawk@kernel.org kuba@kernel.org john.fastabend@gmail.com jolsa@kernel.org linux-kselftest@vger.kernel.org martin.lau@linux.dev mykolal@fb.com song@kernel.org sdf@fomichev.me eddyz87@gmail.com iii@linux.ibm.com netdev@vger.kernel.org
netdev/build_clang success Errors and warnings before: 7 this patch: 7
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 7 this patch: 7
netdev/checkpatch warning CHECK: Lines should not end with a '('
netdev/build_clang_rust success No Rust files in patch. Skipping build
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netdev/source_inline success Was 0 now: 0
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bpf/vmtest-bpf-next-PR success PR summary

Commit Message

Yonghong Song July 18, 2024, 5:02 a.m. UTC 
The following tests are added to verifier_ldsx.c:
  - sign extension of data/data_end/data_meta for tcx programs.
    The actual checking is in bpf_skb_is_valid_access() which
    is called by sk_filter, cg_skb, lwt, tc(tcx) and sk_skb.
  - sign extension of data/data_end/data_meta for xdp programs.
  - sign extension of data/data_end for flow_dissector programs.

All newly-added tests have verification failure with message
"invalid bpf_context access". Without previous patch, all these
tests succeeded verification.

Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
---
 .../selftests/bpf/progs/verifier_ldsx.c       | 112 ++++++++++++++++++
 1 file changed, 112 insertions(+)

Changelog from v1:
  - Simplify test case and still trigger the verification failure.

Comments

Eduard Zingerman July 18, 2024, 8:58 p.m. UTC | #1 
On Wed, 2024-07-17 at 22:02 -0700, Yonghong Song wrote:
> The following tests are added to verifier_ldsx.c:
>   - sign extension of data/data_end/data_meta for tcx programs.
>     The actual checking is in bpf_skb_is_valid_access() which
>     is called by sk_filter, cg_skb, lwt, tc(tcx) and sk_skb.
>   - sign extension of data/data_end/data_meta for xdp programs.
>   - sign extension of data/data_end for flow_dissector programs.
> 
> All newly-added tests have verification failure with message
> "invalid bpf_context access". Without previous patch, all these
> tests succeeded verification.
> 
> Signed-off-by: Yonghong Song <yonghong.song@linux.dev>

Acked-by: Eduard Zingerman <eddyz87@gmail.com>

[...]
bot+bpf-ci@kernel.org July 19, 2024, 6:49 p.m. UTC | #2 
Dear patch submitter,

CI has tested the following submission:
Status:     FAILURE
Name:       [bpf-next,v2,2/2] selftests/bpf: Add tests for ldsx of pkt data/data_end/data_meta accesses
Patchwork:  https://patchwork.kernel.org/project/netdevbpf/list/?series=872131&state=*
Matrix:     https://github.com/kernel-patches/bpf/actions/runs/10012611999

Failed jobs:
test_progs_no_alu32-x86_64-gcc: https://github.com/kernel-patches/bpf/actions/runs/10012611999/job/27678870744
test_progs_cpuv4-x86_64-llvm-18: https://github.com/kernel-patches/bpf/actions/runs/10012611999/job/27678880193

First test_progs failure (test_progs_no_alu32-x86_64-gcc):
#59 connect_force_port
(network_helpers.c:104: errno: Address already in use) Failed to bind socket
test_connect_force_port:FAIL:142


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questions or feedback, please reach out to the Meta Kernel CI team at
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bot+bpf-ci@kernel.org July 19, 2024, 11:51 p.m. UTC | #3 
Dear patch submitter,

CI has tested the following submission:
Status:     SUCCESS
Name:       [bpf-next,v2,2/2] selftests/bpf: Add tests for ldsx of pkt data/data_end/data_meta accesses
Patchwork:  https://patchwork.kernel.org/project/netdevbpf/list/?series=872131&state=*
Matrix:     https://github.com/kernel-patches/bpf/actions/runs/10015588889

No further action is necessary on your part.


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questions or feedback, please reach out to the Meta Kernel CI team at
kernel-ci@meta.com.
bot+bpf-ci@kernel.org July 23, 2024, 12:49 a.m. UTC | #4 
Dear patch submitter,

CI has tested the following submission:
Status:     CONFLICT
Name:       [bpf-next,v2,2/2] selftests/bpf: Add tests for ldsx of pkt data/data_end/data_meta accesses
Patchwork:  https://patchwork.kernel.org/project/netdevbpf/list/?series=872131&state=*
PR:         https://github.com/kernel-patches/bpf/pull/7379

Please rebase your submission onto the most recent upstream change and resubmit
the patch to get it tested again.


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questions or feedback, please reach out to the Meta Kernel CI team at
kernel-ci@meta.com.
bot+bpf-ci@kernel.org July 23, 2024, 2:03 a.m. UTC | #5 
Dear patch submitter,

CI has tested the following submission:
Status:     SUCCESS
Name:       [bpf-next,v2,2/2] selftests/bpf: Add tests for ldsx of pkt data/data_end/data_meta accesses
Patchwork:  https://patchwork.kernel.org/project/netdevbpf/list/?series=872131&state=*
Matrix:     https://github.com/kernel-patches/bpf/actions/runs/10047151662

No further action is necessary on your part.


Please note: this email is coming from an unmonitored mailbox. If you have
questions or feedback, please reach out to the Meta Kernel CI team at
kernel-ci@meta.com.
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/progs/verifier_ldsx.c b/tools/testing/selftests/bpf/progs/verifier_ldsx.c
index d4427d8e1217..52edee41caf6 100644
--- a/tools/testing/selftests/bpf/progs/verifier_ldsx.c
+++ b/tools/testing/selftests/bpf/progs/verifier_ldsx.c
@@ -144,6 +144,118 @@  __naked void ldsx_s32_range(void)
 	: __clobber_all);
 }
 
+SEC("xdp")
+__description("LDSX, xdp s32 xdp_md->data")
+__failure __msg("invalid bpf_context access")
+__naked void ldsx_ctx_1(void)
+{
+	asm volatile (
+	"r2 = *(s32 *)(r1 + %[xdp_md_data]);"
+	"r0 = 0;"
+	"exit;"
+	:
+	: __imm_const(xdp_md_data, offsetof(struct xdp_md, data))
+	: __clobber_all);
+}
+
+SEC("xdp")
+__description("LDSX, xdp s32 xdp_md->data_end")
+__failure __msg("invalid bpf_context access")
+__naked void ldsx_ctx_2(void)
+{
+	asm volatile (
+	"r2 = *(s32 *)(r1 + %[xdp_md_data_end]);"
+	"r0 = 0;"
+	"exit;"
+	:
+	: __imm_const(xdp_md_data_end, offsetof(struct xdp_md, data_end))
+	: __clobber_all);
+}
+
+SEC("xdp")
+__description("LDSX, xdp s32 xdp_md->data_meta")
+__failure __msg("invalid bpf_context access")
+__naked void ldsx_ctx_3(void)
+{
+	asm volatile (
+	"r2 = *(s32 *)(r1 + %[xdp_md_data_meta]);"
+	"r0 = 0;"
+	"exit;"
+	:
+	: __imm_const(xdp_md_data_meta, offsetof(struct xdp_md, data_meta))
+	: __clobber_all);
+}
+
+SEC("tcx/ingress")
+__description("LDSX, tcx s32 __sk_buff->data")
+__failure __msg("invalid bpf_context access")
+__naked void ldsx_ctx_4(void)
+{
+	asm volatile (
+	"r2 = *(s32 *)(r1 + %[sk_buff_data]);"
+	"r0 = 0;"
+	"exit;"
+	:
+	: __imm_const(sk_buff_data, offsetof(struct __sk_buff, data))
+	: __clobber_all);
+}
+
+SEC("tcx/ingress")
+__description("LDSX, tcx s32 __sk_buff->data_end")
+__failure __msg("invalid bpf_context access")
+__naked void ldsx_ctx_5(void)
+{
+	asm volatile (
+	"r2 = *(s32 *)(r1 + %[sk_buff_data_end]);"
+	"r0 = 0;"
+	"exit;"
+	:
+	: __imm_const(sk_buff_data_end, offsetof(struct __sk_buff, data_end))
+	: __clobber_all);
+}
+
+SEC("tcx/ingress")
+__description("LDSX, tcx s32 __sk_buff->data_meta")
+__failure __msg("invalid bpf_context access")
+__naked void ldsx_ctx_6(void)
+{
+	asm volatile (
+	"r2 = *(s32 *)(r1 + %[sk_buff_data_meta]);"
+	"r0 = 0;"
+	"exit;"
+	:
+	: __imm_const(sk_buff_data_meta, offsetof(struct __sk_buff, data_meta))
+	: __clobber_all);
+}
+
+SEC("flow_dissector")
+__description("LDSX, flow_dissector s32 __sk_buff->data")
+__failure __msg("invalid bpf_context access")
+__naked void ldsx_ctx_7(void)
+{
+	asm volatile (
+	"r2 = *(s32 *)(r1 + %[sk_buff_data]);"
+	"r0 = 0;"
+	"exit;"
+	:
+	: __imm_const(sk_buff_data, offsetof(struct __sk_buff, data))
+	: __clobber_all);
+}
+
+SEC("flow_dissector")
+__description("LDSX, flow_dissector s32 __sk_buff->data_end")
+__failure __msg("invalid bpf_context access")
+__naked void ldsx_ctx_8(void)
+{
+	asm volatile (
+	"r2 = *(s32 *)(r1 + %[sk_buff_data_end]);"
+	"r0 = 0;"
+	"exit;"
+	:
+	: __imm_const(sk_buff_data_end, offsetof(struct __sk_buff, data_end))
+	: __clobber_all);
+}
+
 #else
 
 SEC("socket")