cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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sockmap_parse_prog.c (705B)

      1#include <linux/bpf.h>
      2#include <bpf/bpf_helpers.h>
      3#include <bpf/bpf_endian.h>
      4
      5SEC("sk_skb1")
      6int bpf_prog1(struct __sk_buff *skb)
      7{
      8	void *data_end = (void *)(long) skb->data_end;
      9	void *data = (void *)(long) skb->data;
     10	__u8 *d = data;
     11	int err;
     12
     13	if (data + 10 > data_end) {
     14		err = bpf_skb_pull_data(skb, 10);
     15		if (err)
     16			return SK_DROP;
     17
     18		data_end = (void *)(long)skb->data_end;
     19		data = (void *)(long)skb->data;
     20		if (data + 10 > data_end)
     21			return SK_DROP;
     22	}
     23
     24	/* This write/read is a bit pointless but tests the verifier and
     25	 * strparser handler for read/write pkt data and access into sk
     26	 * fields.
     27	 */
     28	d = data;
     29	d[7] = 1;
     30	return skb->len;
     31}
     32
     33char _license[] SEC("license") = "GPL";