diff options
| author | Rabin Vincent <rabin@rab.in> | 2016-01-12 22:17:08 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-01-13 01:06:53 +0300 |
| commit | 229394e8e62a4191d592842cf67e80c62a492937 (patch) | |
| tree | b16b3b389afb1bb660373bab3ec2f986d99a6e13 /net | |
| parent | 7aaed57c5c2890634cfadf725173c7c68ea4cb4f (diff) | |
| download | linux-229394e8e62a4191d592842cf67e80c62a492937.tar.xz | |
net: bpf: reject invalid shifts
On ARM64, a BUG() is triggered in the eBPF JIT if a filter with a
constant shift that can't be encoded in the immediate field of the
UBFM/SBFM instructions is passed to the JIT. Since these shifts
amounts, which are negative or >= regsize, are invalid, reject them in
the eBPF verifier and the classic BPF filter checker, for all
architectures.
Signed-off-by: Rabin Vincent <rabin@rab.in>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/filter.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/net/core/filter.c b/net/core/filter.c index 77cdfb455e7f..94d26201080d 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -785,6 +785,11 @@ static int bpf_check_classic(const struct sock_filter *filter, if (ftest->k == 0) return -EINVAL; break; + case BPF_ALU | BPF_LSH | BPF_K: + case BPF_ALU | BPF_RSH | BPF_K: + if (ftest->k >= 32) + return -EINVAL; + break; case BPF_LD | BPF_MEM: case BPF_LDX | BPF_MEM: case BPF_ST: |