granicus.if.org Git - strace/blob - fetch_bpf_fprog.c

   1 /*
   2  * Copyright (c) 2015-2018 Dmitry V. Levin <ldv@altlinux.org>
   3  * All rights reserved.
   4  *
   5  * SPDX-License-Identifier: LGPL-2.1-or-later
   6  */
   7
   8 #include "defs.h"
   9
  10 #include DEF_MPERS_TYPE(struct_sock_fprog)
  11
  12 #include <linux/filter.h>
  13 typedef struct sock_fprog struct_sock_fprog;
  14
  15 #include MPERS_DEFS
  16 #include "bpf_fprog.h"
  17
  18 MPERS_PRINTER_DECL(unsigned int, get_sock_fprog_size, void)
  19 {
  20         return sizeof(struct_sock_fprog);
  21 }
  22
  23 MPERS_PRINTER_DECL(bool, fetch_bpf_fprog, struct tcb *const tcp,
  24                    const kernel_ulong_t addr, void *const p)
  25 {
  26         struct bpf_fprog *pfp = p;
  27         struct_sock_fprog mfp;
  28
  29         if ((sizeof(*pfp) == sizeof(mfp))
  30             && (offsetof(struct bpf_fprog, filter) ==
  31                 offsetof(struct_sock_fprog, filter)))
  32                 return !umove_or_printaddr(tcp, addr, pfp);
  33
  34         if (umove_or_printaddr(tcp, addr, &mfp))
  35                 return false;
  36
  37         pfp->len = mfp.len;
  38         pfp->filter =
  39 #ifndef IN_MPERS
  40                 (uintptr_t)
  41 #endif
  42                 mfp.filter;
  43         return true;
  44 }