1f2bc06a8d
Update the comments for aa_getprocattr() and audit_resource(), the
args of them have beed changed since commit 76a1d263ab ("apparmor:
switch getprocattr to using label_print fns()").
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
136 lines
3.4 KiB
C
136 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* AppArmor security module
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*
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* This file contains AppArmor /proc/<pid>/attr/ interface functions
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*
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* Copyright (C) 1998-2008 Novell/SUSE
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* Copyright 2009-2010 Canonical Ltd.
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*/
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#include "include/apparmor.h"
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#include "include/cred.h"
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#include "include/policy.h"
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#include "include/policy_ns.h"
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#include "include/domain.h"
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#include "include/procattr.h"
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/**
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* aa_getprocattr - Return the label information for @label
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* @label: the label to print label info about (NOT NULL)
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* @string: Returns - string containing the label info (NOT NULL)
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*
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* Requires: label != NULL && string != NULL
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*
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* Creates a string containing the label information for @label.
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*
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* Returns: size of string placed in @string else error code on failure
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*/
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int aa_getprocattr(struct aa_label *label, char **string)
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{
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struct aa_ns *ns = labels_ns(label);
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struct aa_ns *current_ns = aa_get_current_ns();
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int len;
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if (!aa_ns_visible(current_ns, ns, true)) {
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aa_put_ns(current_ns);
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return -EACCES;
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}
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len = aa_label_snxprint(NULL, 0, current_ns, label,
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FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
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FLAG_HIDDEN_UNCONFINED);
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AA_BUG(len < 0);
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*string = kmalloc(len + 2, GFP_KERNEL);
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if (!*string) {
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aa_put_ns(current_ns);
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return -ENOMEM;
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}
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len = aa_label_snxprint(*string, len + 2, current_ns, label,
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FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
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FLAG_HIDDEN_UNCONFINED);
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if (len < 0) {
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aa_put_ns(current_ns);
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return len;
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}
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(*string)[len] = '\n';
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(*string)[len + 1] = 0;
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aa_put_ns(current_ns);
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return len + 1;
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}
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/**
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* split_token_from_name - separate a string of form <token>^<name>
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* @op: operation being checked
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* @args: string to parse (NOT NULL)
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* @token: stores returned parsed token value (NOT NULL)
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*
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* Returns: start position of name after token else NULL on failure
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*/
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static char *split_token_from_name(const char *op, char *args, u64 *token)
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{
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char *name;
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*token = simple_strtoull(args, &name, 16);
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if ((name == args) || *name != '^') {
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AA_ERROR("%s: Invalid input '%s'", op, args);
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return ERR_PTR(-EINVAL);
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}
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name++; /* skip ^ */
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if (!*name)
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name = NULL;
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return name;
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}
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/**
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* aa_setprocattr_changehat - handle procattr interface to change_hat
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* @args: args received from writing to /proc/<pid>/attr/current (NOT NULL)
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* @size: size of the args
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* @flags: set of flags governing behavior
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*
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* Returns: %0 or error code if change_hat fails
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*/
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int aa_setprocattr_changehat(char *args, size_t size, int flags)
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{
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char *hat;
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u64 token;
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const char *hats[16]; /* current hard limit on # of names */
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int count = 0;
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hat = split_token_from_name(OP_CHANGE_HAT, args, &token);
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if (IS_ERR(hat))
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return PTR_ERR(hat);
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if (!hat && !token) {
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AA_ERROR("change_hat: Invalid input, NULL hat and NULL magic");
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return -EINVAL;
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}
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if (hat) {
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/* set up hat name vector, args guaranteed null terminated
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* at args[size] by setprocattr.
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*
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* If there are multiple hat names in the buffer each is
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* separated by a \0. Ie. userspace writes them pre tokenized
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*/
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char *end = args + size;
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for (count = 0; (hat < end) && count < 16; ++count) {
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char *next = hat + strlen(hat) + 1;
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hats[count] = hat;
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AA_DEBUG("%s: (pid %d) Magic 0x%llx count %d hat '%s'\n"
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, __func__, current->pid, token, count, hat);
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hat = next;
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}
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} else
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AA_DEBUG("%s: (pid %d) Magic 0x%llx count %d Hat '%s'\n",
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__func__, current->pid, token, count, "<NULL>");
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return aa_change_hat(hats, count, token, flags);
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}
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