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(option: arg->val, bf, size, show_prefix: 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, show_prefix: arg->show_string_prefix); |
82 | } |
83 | |