tools/perf/trace/beauty/prctl.c

   1 // SPDX-License-Identifier: LGPL-2.1
   2 /*
   3  * trace/beauty/prctl.c
   4  *
   5  *  Copyright (C) 2017, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
   6  */
   7
   8 #include "trace/beauty/beauty.h"
   9 #include <linux/kernel.h>
  10 #include <uapi/linux/prctl.h>
  11
  12 #include "trace/beauty/generated/prctl_option_array.c"
  13
  14 DEFINE_STRARRAY(prctl_options, "PR_");
  15
  16 static size_t prctl__scnprintf_option(int option, char *bf, size_t size, bool show_prefix)
  17 {
  18         return strarray__scnprintf(&strarray__prctl_options, bf, size, "%d", show_prefix, option);
  19 }
  20
  21 static size_t prctl__scnprintf_set_mm(int option, char *bf, size_t size, bool show_prefix)
  22 {
  23         static DEFINE_STRARRAY(prctl_set_mm_options, "PR_SET_MM_");
  24         return strarray__scnprintf(&strarray__prctl_set_mm_options, bf, size, "%d", show_prefix, option);
  25 }
  26
  27 size_t syscall_arg__scnprintf_prctl_arg2(char *bf, size_t size, struct syscall_arg *arg)
  28 {
  29         int option = syscall_arg__val(arg, 0);
  30
  31         if (option == PR_SET_MM)
  32                 return prctl__scnprintf_set_mm(arg->val, bf, size, arg->show_string_prefix);
  33         /*
  34          * We still don't grab the contents of pointers on entry or exit,
  35          * so just print them as hex numbers
  36          */
  37         if (option == PR_SET_NAME)
  38                 return syscall_arg__scnprintf_hex(bf, size, arg);
  39
  40         return syscall_arg__scnprintf_long(bf, size, arg);
  41 }
  42
  43 size_t syscall_arg__scnprintf_prctl_arg3(char *bf, size_t size, struct syscall_arg *arg)
  44 {
  45         int option = syscall_arg__val(arg, 0);
  46
  47         if (option == PR_SET_MM)
  48                 return syscall_arg__scnprintf_hex(bf, size, arg);
  49
  50         return syscall_arg__scnprintf_long(bf, size, arg);
  51 }
  52
  53 size_t syscall_arg__scnprintf_prctl_option(char *bf, size_t size, struct syscall_arg *arg)
  54 {
  55         unsigned long option = arg->val;
  56         enum {
  57                 SPO_ARG2 = (1 << 1),
  58                 SPO_ARG3 = (1 << 2),
  59                 SPO_ARG4 = (1 << 3),
  60                 SPO_ARG5 = (1 << 4),
  61                 SPO_ARG6 = (1 << 5),
  62         };
  63         const u8 all_but2 = SPO_ARG3 | SPO_ARG4 | SPO_ARG5 | SPO_ARG6;
  64         const u8 all = SPO_ARG2 | all_but2;
  65         const u8 masks[] = {
  66                 [PR_GET_DUMPABLE]        = all,
  67                 [PR_SET_DUMPABLE]        = all_but2,
  68                 [PR_SET_NAME]            = all_but2,
  69                 [PR_GET_CHILD_SUBREAPER] = all_but2,
  70                 [PR_SET_CHILD_SUBREAPER] = all_but2,
  71                 [PR_GET_SECUREBITS]      = all,
  72                 [PR_SET_SECUREBITS]      = all_but2,
  73                 [PR_SET_MM]              = SPO_ARG4 | SPO_ARG5 | SPO_ARG6,
  74                 [PR_GET_PDEATHSIG]       = all,
  75                 [PR_SET_PDEATHSIG]       = all_but2,
  76         };
  77
  78         if (option < ARRAY_SIZE(masks))
  79                 arg->mask |= masks[option];
  80
  81         return prctl__scnprintf_option(option, bf, size, arg->show_string_prefix);
  82 }