LXR linux/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
  14static 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
  20static 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
  26size_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
  42size_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
  52size_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}
  82