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  1. 06 1月, 2017 5 次提交
  3. 17 12月, 2016 2 次提交
    • D
      bpf, test_verifier: fix a test case error result on unprivileged · 0eb6984f
      由 Daniel Borkmann 提交于 
      Running ./test_verifier as unprivileged lets 1 out of 98 tests fail:

  [...]
  #71 unpriv: check that printk is disallowed FAIL
  Unexpected error message!
  0: (7a) *(u64 *)(r10 -8) = 0
  1: (bf) r1 = r10
  2: (07) r1 += -8
  3: (b7) r2 = 8
  4: (bf) r3 = r1
  5: (85) call bpf_trace_printk#6
  unknown func bpf_trace_printk#6
  [...]

The test case is correct, just that the error outcome changed with
ebb676da ("bpf: Print function name in addition to function id").
Same as with e00c7b21 ("bpf: fix multiple issues in selftest suite
and samples") issue 2), so just fix up the function name.

Fixes: ebb676da ("bpf: Print function name in addition to function id")
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
Acked-by: NAlexei Starovoitov <ast@kernel.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      0eb6984f
    • D
      bpf: fix regression on verifier pruning wrt map lookups · a08dd0da
      由 Daniel Borkmann 提交于 
      Commit 57a09bf0 ("bpf: Detect identical PTR_TO_MAP_VALUE_OR_NULL
registers") introduced a regression where existing programs stopped
loading due to reaching the verifier's maximum complexity limit,
whereas prior to this commit they were loading just fine; the affected
program has roughly 2k instructions.

What was found is that state pruning couldn't be performed effectively
anymore due to mismatches of the verifier's register state, in particular
in the id tracking. It doesn't mean that 57a09bf0 is incorrect per
se, but rather that verifier needs to perform a lot more work for the
same program with regards to involved map lookups.

Since commit 57a09bf0 is only about tracking registers with type
PTR_TO_MAP_VALUE_OR_NULL, the id is only needed to follow registers
until they are promoted through pattern matching with a NULL check to
either PTR_TO_MAP_VALUE or UNKNOWN_VALUE type. After that point, the
id becomes irrelevant for the transitioned types.

For UNKNOWN_VALUE, id is already reset to 0 via mark_reg_unknown_value(),
but not so for PTR_TO_MAP_VALUE where id is becoming stale. It's even
transferred further into other types that don't make use of it. Among
others, one example is where UNKNOWN_VALUE is set on function call
return with RET_INTEGER return type.

states_equal() will then fall through the memcmp() on register state;
note that the second memcmp() uses offsetofend(), so the id is part of
that since d2a4dd37 ("bpf: fix state equivalence"). But the bisect
pointed already to 57a09bf0, where we really reach beyond complexity
limit. What I found was that states_equal() often failed in this
case due to id mismatches in spilled regs with registers in type
PTR_TO_MAP_VALUE. Unlike non-spilled regs, spilled regs just perform
a memcmp() on their reg state and don't have any other optimizations
in place, therefore also id was relevant in this case for making a
pruning decision.

We can safely reset id to 0 as well when converting to PTR_TO_MAP_VALUE.
For the affected program, it resulted in a ~17 fold reduction of
complexity and let the program load fine again. Selftest suite also
runs fine. The only other place where env->id_gen is used currently is
through direct packet access, but for these cases id is long living, thus
a different scenario.

Also, the current logic in mark_map_regs() is not fully correct when
marking NULL branch with UNKNOWN_VALUE. We need to cache the destination
reg's id in any case. Otherwise, once we marked that reg as UNKNOWN_VALUE,
it's id is reset and any subsequent registers that hold the original id
and are of type PTR_TO_MAP_VALUE_OR_NULL won't be marked UNKNOWN_VALUE
anymore, since mark_map_reg() reuses the uncached regs[regno].id that
was just overridden. Note, we don't need to cache it outside of
mark_map_regs(), since it's called once on this_branch and the other
time on other_branch, which are both two independent verifier states.
A test case for this is added here, too.

Fixes: 57a09bf0 ("bpf: Detect identical PTR_TO_MAP_VALUE_OR_NULL registers")
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
Acked-by: NThomas Graf <tgraf@suug.ch>
Acked-by: NAlexei Starovoitov <ast@kernel.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      a08dd0da
  5. 16 12月, 2016 1 次提交
  7. 15 12月, 2016 25 次提交
  9. 14 12月, 2016 1 次提交
  11. 13 12月, 2016 3 次提交
  13. 10 12月, 2016 1 次提交
  15. 09 12月, 2016 1 次提交
    • C
      kselftests: Exercise hw-independent mock tests for i915.ko · c4612656
      由 Chris Wilson 提交于 
      Although being a GPU driver most functionality of i915.ko depends upon
real hardware, many of its internal interfaces can be "mocked" and so
tested independently of any hardware. Expanding the test coverage is not
only useful for i915.ko, but should provide some integration tests for
core infrastructure as well.

Loading i915.ko with mock_selftests=-1 will cause it to execute its mock
tests then fail with -ENOTTY. If the driver is already loaded and bound
to hardware, it requires a few more steps to unbind, and so the simple
preliminary modprobe -r will fail.
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Cc: Shuah Khan <shuah@kernel.org>
Cc: linux-kselftest@vger.kernel.org
Signed-off-by: NShuah Khan <shuahkh@osg.samsung.com>
      c4612656
  17. 08 12月, 2016 1 次提交