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author | Daniel Borkmann <daniel@iogearbox.net> | 2019-06-19 02:22:53 +0200 |
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committer | Daniel Borkmann <daniel@iogearbox.net> | 2019-06-19 02:22:53 +0200 |
commit | 94079b64255fe40b9b53fd2e4081f68b9b14f54a (patch) | |
tree | 2901e802c5161bb29dc5882fa14043f46de96cd0 /arch/parisc/include/uapi | |
parent | libbpf: constify getter APIs (diff) | |
parent | bpf: precise scalar_value tracking (diff) | |
download | linux-94079b64255fe40b9b53fd2e4081f68b9b14f54a.tar.xz linux-94079b64255fe40b9b53fd2e4081f68b9b14f54a.zip |
Merge branch 'bpf-bounded-loops'
Alexei Starovoitov says:
====================
v2->v3: fixed issues in backtracking pointed out by Andrii.
The next step is to add a lot more tests for backtracking.
v1->v2: addressed Andrii's feedback.
this patch set introduces verifier support for bounded loops and
adds several other improvements.
Ideally they would be introduced one at a time,
but to support bounded loop the verifier needs to 'step back'
in the patch 1. That patch introduces tracking of spill/fill
of constants through the stack. Though it's a useful feature
it hurts cilium tests.
Patch 3 introduces another feature by extending is_branch_taken
logic to 'if rX op rY' conditions. This feature is also
necessary to support bounded loops.
Then patch 4 adds support for the loops while adding
key heuristics with jmp_processed.
Introduction of parentage chain of verifier states in patch 4
allows patch 9 to add backtracking of precise scalar registers
which finally resolves degradation from patch 1.
The end result is much faster verifier for existing programs
and new support for loops.
See patch 8 for many kinds of loops that are now validated.
Patch 9 is the most tricky one and could be rewritten with
a different algorithm in the future.
====================
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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