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1// SPDX-License-Identifier: LGPL-2.12/*3 * trace/beauty/prctl.c4 *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 <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 numbers36 */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