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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142// 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) * @newline: indicates that a newline should be added * * 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, bool newline){ 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) { kfree(*string); *string = NULL; aa_put_ns(current_ns); return len; }
if (newline) (*string)[len++] = '\n'; (*string)[len] = 0;
aa_put_ns(current_ns); return len;}
/** * 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(DEBUG_DOMAIN, "%s: (pid %d) Magic 0x%llx count %d hat '%s'\n" , __func__, current->pid, token, count, hat); hat = next; } } else AA_DEBUG(DEBUG_DOMAIN, "%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);}