tools/perf/tests/workloads/landlock.c

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #include <linux/compiler.h>
   3 #include <linux/types.h>
   4 #include <unistd.h>
   5 #include "../tests.h"
   6
   7 /* This workload was initially added to test enum augmentation with BTF in perf
   8  * trace because its the only syscall that has an enum argument. Since it is
   9  * a recent addition to the Linux kernel (at the time of the introduction of this
  10  * 'perf test' workload) we just add the required types and defines here instead
  11  * of including linux/landlock, that isn't available in older systems.
  12  *
  13  * We are not interested in the the result of the syscall, just in intercepting
  14  * its arguments.
  15  */
  16
  17 #ifndef __NR_landlock_add_rule
  18 #define __NR_landlock_add_rule 445
  19 #endif
  20
  21 #ifndef LANDLOCK_ACCESS_FS_READ_FILE
  22 #define LANDLOCK_ACCESS_FS_READ_FILE    (1ULL << 2)
  23
  24 #define LANDLOCK_RULE_PATH_BENEATH      1
  25
  26 struct landlock_path_beneath_attr {
  27         __u64 allowed_access;
  28         __s32 parent_fd;
  29 };
  30 #endif
  31
  32 #ifndef LANDLOCK_ACCESS_NET_CONNECT_TCP
  33 #define LANDLOCK_ACCESS_NET_CONNECT_TCP (1ULL << 1)
  34
  35 #define LANDLOCK_RULE_NET_PORT          2
  36
  37 struct landlock_net_port_attr {
  38         __u64 allowed_access;
  39         __u64 port;
  40 };
  41 #endif
  42
  43 static int landlock(int argc __maybe_unused, const char **argv __maybe_unused)
  44 {
  45         int fd = 11, flags = 45;
  46
  47         struct landlock_path_beneath_attr path_beneath_attr = {
  48                 .allowed_access = LANDLOCK_ACCESS_FS_READ_FILE,
  49                 .parent_fd = 14,
  50         };
  51
  52         struct landlock_net_port_attr net_port_attr = {
  53                 .port = 19,
  54                 .allowed_access = LANDLOCK_ACCESS_NET_CONNECT_TCP,
  55         };
  56
  57         syscall(__NR_landlock_add_rule, fd, LANDLOCK_RULE_PATH_BENEATH,
  58                 &path_beneath_attr, flags);
  59
  60         syscall(__NR_landlock_add_rule, fd, LANDLOCK_RULE_NET_PORT,
  61                 &net_port_attr, flags);
  62
  63         return 0;
  64 }
  65
  66 DEFINE_WORKLOAD(landlock);