root/tools/perf/trace/beauty/prctl.c

DEFINITIONS

1. prctl__scnprintf_option
2. prctl__scnprintf_set_mm
3. syscall_arg__scnprintf_prctl_arg2
4. syscall_arg__scnprintf_prctl_arg3
5. syscall_arg__scnprintf_prctl_option

   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 static size_t prctl__scnprintf_option(int option, char *bf, size_t size, bool show_prefix)
  15 {
  16         static DEFINE_STRARRAY(prctl_options, "PR_");
  17         return strarray__scnprintf(&strarray__prctl_options, bf, size, "%d", show_prefix, option);
  18 }
  19 
  20 static size_t prctl__scnprintf_set_mm(int option, char *bf, size_t size, bool show_prefix)
  21 {
  22         static DEFINE_STRARRAY(prctl_set_mm_options, "PR_SET_MM_");
  23         return strarray__scnprintf(&strarray__prctl_set_mm_options, bf, size, "%d", show_prefix, option);
  24 }
  25 
  26 size_t syscall_arg__scnprintf_prctl_arg2(char *bf, size_t size, struct syscall_arg *arg)
  27 {
  28         int option = syscall_arg__val(arg, 0);
  29 
  30         if (option == PR_SET_MM)
  31                 return prctl__scnprintf_set_mm(arg->val, bf, size, arg->show_string_prefix);
  32         /*
  33          * We still don't grab the contents of pointers on entry or exit,
  34          * so just print them as hex numbers
  35          */
  36         if (option == PR_SET_NAME)
  37                 return syscall_arg__scnprintf_hex(bf, size, arg);
  38 
  39         return syscall_arg__scnprintf_long(bf, size, arg);
  40 }
  41 
  42 size_t syscall_arg__scnprintf_prctl_arg3(char *bf, size_t size, struct syscall_arg *arg)
  43 {
  44         int option = syscall_arg__val(arg, 0);
  45 
  46         if (option == PR_SET_MM)
  47                 return syscall_arg__scnprintf_hex(bf, size, arg);
  48 
  49         return syscall_arg__scnprintf_long(bf, size, arg);
  50 }
  51 
  52 size_t syscall_arg__scnprintf_prctl_option(char *bf, size_t size, struct syscall_arg *arg)
  53 {
  54         unsigned long option = arg->val;
  55         enum {
  56                 SPO_ARG2 = (1 << 1),
  57                 SPO_ARG3 = (1 << 2),
  58                 SPO_ARG4 = (1 << 3),
  59                 SPO_ARG5 = (1 << 4),
  60                 SPO_ARG6 = (1 << 5),
  61         };
  62         const u8 all_but2 = SPO_ARG3 | SPO_ARG4 | SPO_ARG5 | SPO_ARG6;
  63         const u8 all = SPO_ARG2 | all_but2;
  64         const u8 masks[] = {
  65                 [PR_GET_DUMPABLE]        = all,
  66                 [PR_SET_DUMPABLE]        = all_but2,
  67                 [PR_SET_NAME]            = all_but2,
  68                 [PR_GET_CHILD_SUBREAPER] = all_but2,
  69                 [PR_SET_CHILD_SUBREAPER] = all_but2,
  70                 [PR_GET_SECUREBITS]      = all,
  71                 [PR_SET_SECUREBITS]      = all_but2,
  72                 [PR_SET_MM]              = SPO_ARG4 | SPO_ARG5 | SPO_ARG6,
  73                 [PR_GET_PDEATHSIG]       = all,
  74                 [PR_SET_PDEATHSIG]       = all_but2,
  75         };
  76 
  77         if (option < ARRAY_SIZE(masks))
  78                 arg->mask |= masks[option];
  79 
  80         return prctl__scnprintf_option(option, bf, size, arg->show_string_prefix);
  81 }