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
  14DEFINE_STRARRAY(prctl_options, "PR_");
  15
  16static 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
  21static 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
  27size_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
  43size_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
  53size_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}
  83