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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 | // SPDX-License-Identifier: GPL-2.0-only /* * AppArmor security module * * This file contains AppArmor /proc/<pid>/attr/ interface functions * * Copyright (C) 1998-2008 Novell/SUSE * Copyright 2009-2010 Canonical Ltd. */ #include "include/apparmor.h" #include "include/cred.h" #include "include/policy.h" #include "include/policy_ns.h" #include "include/domain.h" #include "include/procattr.h" /** * aa_getprocattr - Return the label information for @label * @label: the label to print label info about (NOT NULL) * @string: Returns - string containing the label info (NOT NULL) * * Requires: label != NULL && string != NULL * * Creates a string containing the label information for @label. * * Returns: size of string placed in @string else error code on failure */ int aa_getprocattr(struct aa_label *label, char **string) { struct aa_ns *ns = labels_ns(label); struct aa_ns *current_ns = aa_get_current_ns(); int len; if (!aa_ns_visible(current_ns, ns, true)) { aa_put_ns(current_ns); return -EACCES; } len = aa_label_snxprint(NULL, 0, current_ns, label, FLAG_SHOW_MODE | FLAG_VIEW_SUBNS | FLAG_HIDDEN_UNCONFINED); AA_BUG(len < 0); *string = kmalloc(len + 2, GFP_KERNEL); if (!*string) { aa_put_ns(current_ns); return -ENOMEM; } len = aa_label_snxprint(*string, len + 2, current_ns, label, FLAG_SHOW_MODE | FLAG_VIEW_SUBNS | FLAG_HIDDEN_UNCONFINED); if (len < 0) { aa_put_ns(current_ns); return len; } (*string)[len] = '\n'; (*string)[len + 1] = 0; aa_put_ns(current_ns); return len + 1; } /** * split_token_from_name - separate a string of form <token>^<name> * @op: operation being checked * @args: string to parse (NOT NULL) * @token: stores returned parsed token value (NOT NULL) * * Returns: start position of name after token else NULL on failure */ static char *split_token_from_name(const char *op, char *args, u64 *token) { char *name; *token = simple_strtoull(args, &name, 16); if ((name == args) || *name != '^') { AA_ERROR("%s: Invalid input '%s'", op, args); return ERR_PTR(-EINVAL); } name++; /* skip ^ */ if (!*name) name = NULL; return name; } /** * aa_setprocattr_changehat - handle procattr interface to change_hat * @args: args received from writing to /proc/<pid>/attr/current (NOT NULL) * @size: size of the args * @flags: set of flags governing behavior * * Returns: %0 or error code if change_hat fails */ int aa_setprocattr_changehat(char *args, size_t size, int flags) { char *hat; u64 token; const char *hats[16]; /* current hard limit on # of names */ int count = 0; hat = split_token_from_name(OP_CHANGE_HAT, args, &token); if (IS_ERR(hat)) return PTR_ERR(hat); if (!hat && !token) { AA_ERROR("change_hat: Invalid input, NULL hat and NULL magic"); return -EINVAL; } if (hat) { /* set up hat name vector, args guaranteed null terminated * at args[size] by setprocattr. * * If there are multiple hat names in the buffer each is * separated by a \0. Ie. userspace writes them pre tokenized */ char *end = args + size; for (count = 0; (hat < end) && count < 16; ++count) { char *next = hat + strlen(hat) + 1; hats[count] = hat; AA_DEBUG("%s: (pid %d) Magic 0x%llx count %d hat '%s'\n" , __func__, current->pid, token, count, hat); hat = next; } } else AA_DEBUG("%s: (pid %d) Magic 0x%llx count %d Hat '%s'\n", __func__, current->pid, token, count, "<NULL>"); return aa_change_hat(hats, count, token, flags); } |