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Subject[rcu:dev.2019.10.02a 24/24] security/safesetid/securityfs.c:182:2: error: implicit declaration of function 'rcu_swap_protected'
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2019.10.02a
head: 06250c65ccb8bd7cbaffe62ed0cc638c0f15b49c
commit: 06250c65ccb8bd7cbaffe62ed0cc638c0f15b49c [24/24] rcu: Remove rcu_swap_protected()
config: i386-randconfig-a002-201940 (attached as .config)
compiler: gcc-6 (Debian 6.3.0-18+deb9u1) 6.3.0 20170516
reproduce:
git checkout 06250c65ccb8bd7cbaffe62ed0cc638c0f15b49c
# save the attached .config to linux build tree
make ARCH=i386

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

security/safesetid/securityfs.c: In function 'handle_policy_update':
>> security/safesetid/securityfs.c:182:2: error: implicit declaration of function 'rcu_swap_protected' [-Werror=implicit-function-declaration]
rcu_swap_protected(safesetid_setuid_rules, pol,
^~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors

vim +/rcu_swap_protected +182 security/safesetid/securityfs.c

4f72123da57965 Jann Horn 2019-04-11 109
03638e62f55f27 Jann Horn 2019-04-10 110 static ssize_t handle_policy_update(struct file *file,
03638e62f55f27 Jann Horn 2019-04-10 111 const char __user *ubuf, size_t len)
03638e62f55f27 Jann Horn 2019-04-10 112 {
03638e62f55f27 Jann Horn 2019-04-10 113 struct setuid_ruleset *pol;
03638e62f55f27 Jann Horn 2019-04-10 114 char *buf, *p, *end;
03638e62f55f27 Jann Horn 2019-04-10 115 int err;
03638e62f55f27 Jann Horn 2019-04-10 116
03638e62f55f27 Jann Horn 2019-04-10 117 pol = kmalloc(sizeof(struct setuid_ruleset), GFP_KERNEL);
03638e62f55f27 Jann Horn 2019-04-10 118 if (!pol)
03638e62f55f27 Jann Horn 2019-04-10 119 return -ENOMEM;
fbd9acb2dc2aa5 Jann Horn 2019-04-11 120 pol->policy_str = NULL;
03638e62f55f27 Jann Horn 2019-04-10 121 hash_init(pol->rules);
03638e62f55f27 Jann Horn 2019-04-10 122
03638e62f55f27 Jann Horn 2019-04-10 123 p = buf = memdup_user_nul(ubuf, len);
03638e62f55f27 Jann Horn 2019-04-10 124 if (IS_ERR(buf)) {
03638e62f55f27 Jann Horn 2019-04-10 125 err = PTR_ERR(buf);
03638e62f55f27 Jann Horn 2019-04-10 126 goto out_free_pol;
03638e62f55f27 Jann Horn 2019-04-10 127 }
fbd9acb2dc2aa5 Jann Horn 2019-04-11 128 pol->policy_str = kstrdup(buf, GFP_KERNEL);
fbd9acb2dc2aa5 Jann Horn 2019-04-11 129 if (pol->policy_str == NULL) {
fbd9acb2dc2aa5 Jann Horn 2019-04-11 130 err = -ENOMEM;
fbd9acb2dc2aa5 Jann Horn 2019-04-11 131 goto out_free_buf;
fbd9acb2dc2aa5 Jann Horn 2019-04-11 132 }
03638e62f55f27 Jann Horn 2019-04-10 133
03638e62f55f27 Jann Horn 2019-04-10 134 /* policy lines, including the last one, end with \n */
03638e62f55f27 Jann Horn 2019-04-10 135 while (*p != '\0') {
03638e62f55f27 Jann Horn 2019-04-10 136 struct setuid_rule *rule;
03638e62f55f27 Jann Horn 2019-04-10 137
03638e62f55f27 Jann Horn 2019-04-10 138 end = strchr(p, '\n');
03638e62f55f27 Jann Horn 2019-04-10 139 if (end == NULL) {
03638e62f55f27 Jann Horn 2019-04-10 140 err = -EINVAL;
03638e62f55f27 Jann Horn 2019-04-10 141 goto out_free_buf;
03638e62f55f27 Jann Horn 2019-04-10 142 }
03638e62f55f27 Jann Horn 2019-04-10 143 *end = '\0';
03638e62f55f27 Jann Horn 2019-04-10 144
03638e62f55f27 Jann Horn 2019-04-10 145 rule = kmalloc(sizeof(struct setuid_rule), GFP_KERNEL);
03638e62f55f27 Jann Horn 2019-04-10 146 if (!rule) {
03638e62f55f27 Jann Horn 2019-04-10 147 err = -ENOMEM;
03638e62f55f27 Jann Horn 2019-04-10 148 goto out_free_buf;
03638e62f55f27 Jann Horn 2019-04-10 149 }
03638e62f55f27 Jann Horn 2019-04-10 150
03638e62f55f27 Jann Horn 2019-04-10 151 err = parse_policy_line(file, p, rule);
03638e62f55f27 Jann Horn 2019-04-10 152 if (err)
03638e62f55f27 Jann Horn 2019-04-10 153 goto out_free_rule;
03638e62f55f27 Jann Horn 2019-04-10 154
03638e62f55f27 Jann Horn 2019-04-10 155 if (_setuid_policy_lookup(pol, rule->src_uid, rule->dst_uid) ==
03638e62f55f27 Jann Horn 2019-04-10 156 SIDPOL_ALLOWED) {
03638e62f55f27 Jann Horn 2019-04-10 157 pr_warn("bad policy: duplicate entry\n");
03638e62f55f27 Jann Horn 2019-04-10 158 err = -EEXIST;
03638e62f55f27 Jann Horn 2019-04-10 159 goto out_free_rule;
03638e62f55f27 Jann Horn 2019-04-10 160 }
03638e62f55f27 Jann Horn 2019-04-10 161
4f72123da57965 Jann Horn 2019-04-11 162 insert_rule(pol, rule);
03638e62f55f27 Jann Horn 2019-04-10 163 p = end + 1;
03638e62f55f27 Jann Horn 2019-04-10 164 continue;
03638e62f55f27 Jann Horn 2019-04-10 165
03638e62f55f27 Jann Horn 2019-04-10 166 out_free_rule:
03638e62f55f27 Jann Horn 2019-04-10 167 kfree(rule);
03638e62f55f27 Jann Horn 2019-04-10 168 goto out_free_buf;
03638e62f55f27 Jann Horn 2019-04-10 169 }
03638e62f55f27 Jann Horn 2019-04-10 170
4f72123da57965 Jann Horn 2019-04-11 171 err = verify_ruleset(pol);
4f72123da57965 Jann Horn 2019-04-11 172 /* bogus policy falls through after fixing it up */
4f72123da57965 Jann Horn 2019-04-11 173 if (err && err != -EINVAL)
4f72123da57965 Jann Horn 2019-04-11 174 goto out_free_buf;
4f72123da57965 Jann Horn 2019-04-11 175
03638e62f55f27 Jann Horn 2019-04-10 176 /*
03638e62f55f27 Jann Horn 2019-04-10 177 * Everything looks good, apply the policy and release the old one.
03638e62f55f27 Jann Horn 2019-04-10 178 * What we really want here is an xchg() wrapper for RCU, but since that
03638e62f55f27 Jann Horn 2019-04-10 179 * doesn't currently exist, just use a spinlock for now.
03638e62f55f27 Jann Horn 2019-04-10 180 */
fbd9acb2dc2aa5 Jann Horn 2019-04-11 181 mutex_lock(&policy_update_lock);
03638e62f55f27 Jann Horn 2019-04-10 @182 rcu_swap_protected(safesetid_setuid_rules, pol,
03638e62f55f27 Jann Horn 2019-04-10 183 lockdep_is_held(&policy_update_lock));
fbd9acb2dc2aa5 Jann Horn 2019-04-11 184 mutex_unlock(&policy_update_lock);
03638e62f55f27 Jann Horn 2019-04-10 185 err = len;
03638e62f55f27 Jann Horn 2019-04-10 186
03638e62f55f27 Jann Horn 2019-04-10 187 out_free_buf:
03638e62f55f27 Jann Horn 2019-04-10 188 kfree(buf);
03638e62f55f27 Jann Horn 2019-04-10 189 out_free_pol:
21ab8580b383f2 Micah Morton 2019-09-17 190 if (pol)
03638e62f55f27 Jann Horn 2019-04-10 191 release_ruleset(pol);
03638e62f55f27 Jann Horn 2019-04-10 192 return err;
aeca4e2ca65c1a Micah Morton 2019-01-16 193 }
aeca4e2ca65c1a Micah Morton 2019-01-16 194

:::::: The code at line 182 was first introduced by commit
:::::: 03638e62f55f27e7a96d6b1175e75b7a81e562b3 LSM: SafeSetID: rewrite userspace API to atomic updates

:::::: TO: Jann Horn <jannh@google.com>
:::::: CC: Micah Morton <mortonm@chromium.org>

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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