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selftests/bpf: Extend verifier and bpf_sock tests for dst_port loads

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commit 8f50f16ff39dd4e2d43d1548ca66925652f8aff7 upstream.

Add coverage to the verifier tests and tests for reading bpf_sock fields to
ensure that 32-bit, 16-bit, and 8-bit loads from dst_port field are allowed
only at intended offsets and produce expected values.

While 16-bit and 8-bit access to dst_port field is straight-forward, 32-bit
wide loads need be allowed and produce a zero-padded 16-bit value for
backward compatibility.

Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Link: https://lore.kernel.org/r/20220130115518.213259-3-jakub@cloudflare.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
[OP: backport to 5.10: adjusted context in sock_fields.c]
Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jakub Sitnicki
2022-08-01 17:57:02 +03:00
committed by Greg Kroah-Hartman
parent 78c8397132
commit 042fb1c281
4 changed files with 162 additions and 23 deletions
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3
tools/include/uapi/linux/bpf.h
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@@ -4180,7 +4180,8 @@ struct bpf_sock {
__u32 src_ip4;
__u32 src_ip6[4];
__u32 src_port; /* host byte order */
__u32 dst_port; /* network byte order */
__be16 dst_port; /* network byte order */
__u16 :16; /* zero padding */
__u32 dst_ip4;
__u32 dst_ip6[4];
__u32 state;