linux-stable.git/tools/testing/selftests/bpf, branch v6.2

selftests/bpf: Cover listener cloning with progs attached to sockmap

2023-01-25T05:32:55+00:00

Today we test if a child socket is cloned properly from a listening socket
inside a sockmap only when there are no BPF programs attached to the map.

A bug has been reported [1] for the case when sockmap has a verdict program
attached. So cover this case as well to prevent regressions.

[1]: https://lore.kernel.org/r/00000000000073b14905ef2e7401@google.com

Signed-off-by: Jakub Sitnicki 
Acked-by: John Fastabend 
Link: https://lore.kernel.org/r/20230113-sockmap-fix-v2-4-1e0ee7ac2f90@cloudflare.com
Signed-off-by: Alexei Starovoitov

selftests/bpf: Pass BPF skeleton to sockmap_listen ops tests

2023-01-25T05:32:55+00:00

Following patch extends the sockmap ops tests to cover the scenario when a
sockmap with attached programs holds listening sockets.

Pass the BPF skeleton to sockmap ops test so that the can access and attach
the BPF programs.

Signed-off-by: Jakub Sitnicki 
Acked-by: John Fastabend 
Link: https://lore.kernel.org/r/20230113-sockmap-fix-v2-3-1e0ee7ac2f90@cloudflare.com
Signed-off-by: Alexei Starovoitov

selftests/bpf: Verify copy_register_state() preserves parent/live fields

2023-01-19T23:19:23+00:00

A testcase to check that verifier.c:copy_register_state() preserves
register parentage chain and livness information.

Signed-off-by: Eduard Zingerman 
Link: https://lore.kernel.org/r/20230106142214.1040390-3-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov

selftests/bpf: add a test for iter/task_vma for short-lived processes

2022-12-28T22:11:48+00:00

When a task iterator traverses vma(s), it is possible task->mm might
become invalid in the middle of traversal and this may cause kernel
misbehave (e.g., crash)

This test case creates iterators repeatedly and forks short-lived
processes in the background to detect this bug.  The test will last
for 3 seconds to get the chance to trigger the issue.

Signed-off-by: Kui-Feng Lee 
Acked-by: Yonghong Song 
Link: https://lore.kernel.org/r/20221216221855.4122288-3-kuifeng@meta.com
Signed-off-by: Alexei Starovoitov

selftests/bpf: Temporarily disable part of btf_dump:var_data test.

2022-12-28T21:57:47+00:00

Commit 7443b296e699 ("x86/percpu: Move cpu_number next to current_task")
moved global per_cpu variable 'cpu_number' into pcpu_hot structure.
Therefore this part of var_data test is no longer valid.
Disable it until better solution is found.

Signed-off-by: Alexei Starovoitov

selftests/bpf: Add host-tools to gitignore

2022-12-23T21:49:19+00:00

Shows up when cross-compiling:

HOST_SCRATCH_DIR        := $(OUTPUT)/host-tools

vs

SCRATCH_DIR := $(OUTPUT)/tools
HOST_SCRATCH_DIR        := $(SCRATCH_DIR)

Reported-by: John Sperbeck 
Signed-off-by: Stanislav Fomichev 
Signed-off-by: Daniel Borkmann 
Link: https://lore.kernel.org/bpf/20221222213958.2302320-1-sdf@google.com

selftests/bpf: check null propagation only neither reg is PTR_TO_BTF_ID

2022-12-23T01:19:23+00:00

Verify that nullness information is not porpagated in the branches
of register to register JEQ and JNE operations if one of them is
PTR_TO_BTF_ID. Implement this in C level so we can use CO-RE.

Signed-off-by: Hao Sun 
Suggested-by: Martin KaFai Lau 
Link: https://lore.kernel.org/r/20221222024414.29539-2-sunhao.th@gmail.com
Signed-off-by: Martin KaFai Lau

selftests/bpf: Test bpf_skb_adjust_room on CHECKSUM_PARTIAL

2022-12-21T23:56:27+00:00

When the bpf_skb_adjust_room() shrinks the skb such that its csum_start
is invalid, the skb->ip_summed should be reset from CHECKSUM_PARTIAL to
CHECKSUM_NONE.

The commit 54c3f1a81421 ("bpf: pull before calling skb_postpull_rcsum()")
fixed it.

This patch adds a test to ensure the skb->ip_summed changed from
CHECKSUM_PARTIAL to CHECKSUM_NONE after bpf_skb_adjust_room().

Signed-off-by: Martin KaFai Lau 
Signed-off-by: Daniel Borkmann 
Acked-by: Stanislav Fomichev 
Link: https://lore.kernel.org/bpf/20221221185653.1589961-1-martin.lau@linux.dev

selftests/bpf: Add a test for using a cpumap from an freplace-to-XDP program

2022-12-15T05:30:40+00:00

This adds a simple test for inserting an XDP program into a cpumap that is
"owned" by an XDP program that was loaded as PROG_TYPE_EXT (as libxdp
does). Prior to the kernel fix this would fail because the map type
ownership would be set to PROG_TYPE_EXT instead of being resolved to
PROG_TYPE_XDP.

v5:
- Fix a few nits from Andrii, add his ACK
v4:
- Use skeletons for selftest
v3:
- Update comment to better explain the cause
- Add Yonghong's ACK

Acked-by: Yonghong Song 
Acked-by: Andrii Nakryiko 
Signed-off-by: Toke Høiland-Jørgensen 
Link: https://lore.kernel.org/r/20221214230254.790066-2-toke@redhat.com
Signed-off-by: Martin KaFai Lau

selftests/bpf: Select CONFIG_FUNCTION_ERROR_INJECTION

2022-12-14T17:35:41+00:00

BPF selftests require CONFIG_FUNCTION_ERROR_INJECTION to work. However,
CONFIG_FUNCTION_ERROR_INJECTION is no longer 'y' by default after recent
changes. As a result, we are seeing errors like the following from BPF CI:

   bpf_testmod_test_read() is not modifiable
   __x64_sys_setdomainname is not sleepable
   __x64_sys_getpgid is not sleepable

Fix this by explicitly selecting CONFIG_FUNCTION_ERROR_INJECTION in the
selftest config.

Fixes: a4412fdd49dc ("error-injection: Add prompt for function error injection")
Reported-by: Daniel Müller 
Signed-off-by: Song Liu 
Signed-off-by: Andrii Nakryiko 
Signed-off-by: Daniel Borkmann 
Acked-by: Daniel Müller 
Link: https://lore.kernel.org/bpf/20221213220500.3427947-1-song@kernel.org