> I produced a patch for you, but it's not complete but works around the SIGBUS:
>
> Index: print-wg.c
> ===================================================================
> RCS file: /cvs/src/usr.sbin/tcpdump/print-wg.c,v
> retrieving revision 1.6
> diff -u -p -u -r1.6 print-wg.c
> --- print-wg.c 14 Apr 2021 19:34:56 -0000 1.6
> +++ print-wg.c 3 May 2021 16:29:29 -0000
> @@ -21,6 +21,7 @@
>
> #include <stdio.h>
> #include <stddef.h>
> +#include <string.h>
>
> #include "interface.h"
> #include "extract.h"
> @@ -104,6 +105,9 @@ wg_print(const u_char *bp, u_int length)
> struct wg_data *data = (void *)bp;
> u_int caplen;
>
> + uint32_t receiver;
> + uint64_t nonce;
> +
> caplen = snapend - bp;
> if (caplen < sizeof(type))
> goto trunc;
> @@ -142,8 +146,12 @@ wg_print(const u_char *bp, u_int length)
> printf("[wg] keepalive ");
> if (caplen < offsetof(struct wg_data, mac))
> goto trunc;
> +
> + memcpy((void *)&receiver, (void *)&data->receiver,
> sizeof(receiver));
> + memcpy((void *)&nonce, (void *)&data->nonce, sizeof(nonce));
> +
> printf("to 0x%08x nonce %llu",
> - letoh32(data->receiver), letoh64(data->nonce));
> + letoh32(receiver), letoh64(nonce));
> break;
> }
> return;
>
>
> There may be other variables that need the same treatment... if that looks ok
> for you I'll work on that and submit the patch formally.
I dumped with this patch for about an hour, and even restarted the wg tunnel
on the device behind vlan6 so that other types get used (initialization) and
I found that there was no more SIGBUS's for tcpdump on octeon, so I am unsure
if other variables actually do need same treatment still.
Best Regards,
-peter
