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| author |   Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> | 2019-08-22 00:53:58 +0530 |
|---|---|---|
| committer |   Daniel Borkmann <daniel@iogearbox.net> | 2019-08-26 23:05:01 +0200 |
| commit | ede7c460b1da5be7b8ef4efe47f1687babf06408 (patch) | |
| tree | e5263710f10a78a6a58716b01eda99dfae0c561a /drivers/net/ethernet | |
| parent | nfp: bpf: fix latency bug when updating stack index register (diff) | |
| download | linux-dev-ede7c460b1da5be7b8ef4efe47f1687babf06408.tar.xz linux-dev-ede7c460b1da5be7b8ef4efe47f1687babf06408.zip | |
bpf: handle 32-bit zext during constant blinding
Since BPF constant blinding is performed after the verifier pass, the
ALU32 instructions inserted for doubleword immediate loads don't have a
corresponding zext instruction. This is causing a kernel oops on powerpc
and can be reproduced by running 'test_cgroup_storage' with
bpf_jit_harden=2.
Fix this by emitting BPF_ZEXT during constant blinding if
prog->aux->verifier_zext is set.
Fixes: a4b1d3c1ddf6cb ("bpf: verifier: insert zero extension according to analysis result")
Reported-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Reviewed-by: Jiong Wang <jiong.wang@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'drivers/net/ethernet')
0 files changed, 0 insertions, 0 deletions