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 } 83