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git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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71e6cff3e0
Make it so apparmor debug output can be controlled by class flags as well as the debug flag on labels. This provides much finer control at what is being output so apparmor doesn't flood the logs with information that is not needed, making it hard to find what is important. Signed-off-by: John Johansen <john.johansen@canonical.com>
139 lines
3.5 KiB
C
139 lines
3.5 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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* @newline: indicates that a newline should be added
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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, bool newline)
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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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if (newline)
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(*string)[len++] = '\n';
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(*string)[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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/**
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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(DEBUG_DOMAIN,
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"%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(DEBUG_DOMAIN,
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"%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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