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Diffstat (limited to 'Documentation/bpf/verifier.rst')
| -rw-r--r-- | Documentation/bpf/verifier.rst | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/Documentation/bpf/verifier.rst b/Documentation/bpf/verifier.rst index d4326caf01f9..3afa548ec28c 100644 --- a/Documentation/bpf/verifier.rst +++ b/Documentation/bpf/verifier.rst @@ -192,7 +192,7 @@ checked and found to be non-NULL, all copies can become PTR_TO_MAP_VALUEs. As well as range-checking, the tracked information is also used for enforcing alignment of pointer accesses. For instance, on most systems the packet pointer is 2 bytes after a 4-byte alignment. If a program adds 14 bytes to that to jump -over the Ethernet header, then reads IHL and addes (IHL * 4), the resulting +over the Ethernet header, then reads IHL and adds (IHL * 4), the resulting pointer will have a variable offset known to be 4n+2 for some n, so adding the 2 bytes (NET_IP_ALIGN) gives a 4-byte alignment and so word-sized accesses through that pointer are safe. |