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  1. Apr 02, 2023
  3. Apr 01, 2023
  5. Mar 31, 2023
    • David Vernet's avatar
      selftests/bpf: Add testcases for ptr_*_or_null_ in bpf_kptr_xchg · 67efbd57
      David Vernet authored 
      

The second argument of the bpf_kptr_xchg() helper function is
ARG_PTR_TO_BTF_ID_OR_NULL. A recent patch fixed a bug whereby the
verifier would fail with an internal error message if a program invoked
the helper with a PTR_TO_BTF_ID | PTR_MAYBE_NULL register. This testcase
adds some testcases to ensure that it fails gracefully moving forward.

Before the fix, these testcases would have failed an error resembling
the following:

; p = bpf_kfunc_call_test_acquire(&(unsigned long){0});
99: (7b) *(u64 *)(r10 -16) = r7       ; frame1: ...
100: (bf) r1 = r10                    ; frame1: ...
101: (07) r1 += -16                   ; frame1: ...
; p = bpf_kfunc_call_test_acquire(&(unsigned long){0});
102: (85) call bpf_kfunc_call_test_acquire#13908
; frame1: R0_w=ptr_or_null_prog_test_ref_kfunc...
; p = bpf_kptr_xchg(&v->ref_ptr, p);
103: (bf) r1 = r6                     ; frame1: ...
104: (bf) r2 = r0
; frame1: R0_w=ptr_or_null_prog_test_ref_kfunc...
105: (85) call bpf_kptr_xchg#194
verifier internal error: invalid PTR_TO_BTF_ID register for type match

Signed-off-by: default avatarDavid Vernet <void@manifault.com>
Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20230330145203.80506-2-void@manifault.com
      67efbd57
    • David Vernet's avatar
      bpf: Handle PTR_MAYBE_NULL case in PTR_TO_BTF_ID helper call arg · e4c2acab
      David Vernet authored 
      

When validating a helper function argument, we use check_reg_type() to
ensure that the register containing the argument is of the correct type.
When the register's base type is PTR_TO_BTF_ID, there is some
supplemental logic where we do extra checks for various combinations of
PTR_TO_BTF_ID type modifiers. For example, for PTR_TO_BTF_ID,
PTR_TO_BTF_ID | PTR_TRUSTED, and PTR_TO_BTF_ID | MEM_RCU, we call
map_kptr_match_type() for bpf_kptr_xchg() calls, and
btf_struct_ids_match() for other helper calls.

When an unhandled PTR_TO_BTF_ID type modifier combination is passed to
check_reg_type(), the verifier fails with an internal verifier error
message. This can currently be triggered by passing a PTR_MAYBE_NULL
pointer to helper functions (currently just bpf_kptr_xchg()) with an
ARG_PTR_TO_BTF_ID_OR_NULL arg type. For example, by callin
bpf_kptr_xchg(&v->kptr, bpf_cpumask_create()).

Whether or not passing a PTR_MAYBE_NULL arg to an
ARG_PTR_TO_BTF_ID_OR_NULL argument is valid is an interesting question.
In a vacuum, it seems fine. A helper function with an
ARG_PTR_TO_BTF_ID_OR_NULL arg would seem to be implying that it can
handle either a NULL or non-NULL arg, and has logic in place to detect
and gracefully handle each. This is the case for bpf_kptr_xchg(), which
of course simply does an xchg(). On the other hand, bpf_kptr_xchg() also
specifies OBJ_RELEASE, and refcounting semantics for a PTR_MAYBE_NULL
pointer is different than handling it for a NULL _OR_ non-NULL pointer.
For example, with a non-NULL arg, we should always fail if there was not
a nonzero refcount for the value in the register being passed to the
helper. For PTR_MAYBE_NULL on the other hand, it's unclear. If the
pointer is NULL it would be fine, but if it's not NULL, it would be
incorrect to load the program.

The current solution to this is to just fail if PTR_MAYBE_NULL is
passed, and to instead require programs to have a NULL check to
explicitly handle the NULL and non-NULL cases. This seems reasonable.
Not only would it possibly be quite complicated to correctly handle
PTR_MAYBE_NULL refcounting in the verifier, but it's also an arguably
odd programming pattern in general to not explicitly handle the NULL
case anyways. For example, it seems odd to not care about whether a
pointer you're passing to bpf_kptr_xchg() was successfully allocated in
a program such as the following:

private(MASK) static struct bpf_cpumask __kptr * global_mask;

SEC("tp_btf/task_newtask")
int BPF_PROG(example, struct task_struct *task, u64 clone_flags)
{
        struct bpf_cpumask *prev;

	/* bpf_cpumask_create() returns PTR_MAYBE_NULL */
	prev = bpf_kptr_xchg(&global_mask, bpf_cpumask_create());
	if (prev)
		bpf_cpumask_release(prev);

	return 0;
}

This patch therefore updates the verifier to explicitly check for
PTR_MAYBE_NULL in check_reg_type(), and fail gracefully if it's
observed. This isn't really "fixing" anything unsafe or incorrect. We're
just updating the verifier to fail gracefully, and explicitly handle
this pattern rather than unintentionally falling back to an internal
verifier error path. A subsequent patch will update selftests.

Signed-off-by: default avatarDavid Vernet <void@manifault.com>
Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20230330145203.80506-1-void@manifault.com
      e4c2acab
    • Andrii Nakryiko's avatar
      veristat: change guess for __sk_buff from CGROUP_SKB to SCHED_CLS · d8161295
      Andrii Nakryiko authored 
      

SCHED_CLS seems to be a better option as a default guess for freplace
programs that have __sk_buff as a context type.

Reported-by: default avatarEduard Zingerman <eddyz87@gmail.com>
Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20230330190115.3942962-1-andrii@kernel.org


Signed-off-by: default avatarMartin KaFai Lau <martin.lau@kernel.org>
      d8161295
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