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SubjectRe: [PATCH 4/4] x86/ima: define arch_get_ima_policy() for x86
Hi Eric,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on integrity/next-integrity]
[also build test WARNING on next-20180727]
[cannot apply to v4.18-rc6]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Eric-Richter/ima-add-support-for-arch-specific-policies/20180728-072442
base: https://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity.git next-integrity

smatch warnings:
security/integrity/ima/ima_policy.c:522 ima_init_arch_policy() error: potential null dereference 'arch_policy_entry'. (kcalloc returns null)

vim +/arch_policy_entry +522 security/integrity/ima/ima_policy.c

b4c0791e Nayna Jain 2018-07-25 484
b4c0791e Nayna Jain 2018-07-25 485 /*
b4c0791e Nayna Jain 2018-07-25 486 * ima_init_arch_policy - convert arch policy strings to rules
b4c0791e Nayna Jain 2018-07-25 487 *
b4c0791e Nayna Jain 2018-07-25 488 * Return number of arch specific rules.
b4c0791e Nayna Jain 2018-07-25 489 */
b4c0791e Nayna Jain 2018-07-25 490 static int __init ima_init_arch_policy(void)
b4c0791e Nayna Jain 2018-07-25 491 {
b4c0791e Nayna Jain 2018-07-25 492 const char * const *arch_rules;
b4c0791e Nayna Jain 2018-07-25 493 const char * const *rules;
b4c0791e Nayna Jain 2018-07-25 494 int arch_entries = 0;
b4c0791e Nayna Jain 2018-07-25 495 int i = 0;
b4c0791e Nayna Jain 2018-07-25 496
b4c0791e Nayna Jain 2018-07-25 497 arch_rules = arch_get_ima_policy();
b4c0791e Nayna Jain 2018-07-25 498 if (!arch_rules) {
b4c0791e Nayna Jain 2018-07-25 499 pr_info("No architecture policy rules.\n");
b4c0791e Nayna Jain 2018-07-25 500 return arch_entries;
b4c0791e Nayna Jain 2018-07-25 501 }
b4c0791e Nayna Jain 2018-07-25 502
b4c0791e Nayna Jain 2018-07-25 503 /* Get number of rules */
b4c0791e Nayna Jain 2018-07-25 504 for (rules = arch_rules; *rules != NULL; rules++)
b4c0791e Nayna Jain 2018-07-25 505 arch_entries++;
b4c0791e Nayna Jain 2018-07-25 506
b4c0791e Nayna Jain 2018-07-25 507 arch_policy_rules = kcalloc(arch_entries + 1,
b4c0791e Nayna Jain 2018-07-25 508 sizeof(*arch_policy_rules), GFP_KERNEL);
b4c0791e Nayna Jain 2018-07-25 509 if (!arch_policy_rules)
b4c0791e Nayna Jain 2018-07-25 510 return 0;
b4c0791e Nayna Jain 2018-07-25 511
b4c0791e Nayna Jain 2018-07-25 512 arch_policy_entry = kcalloc(arch_entries + 1,
b4c0791e Nayna Jain 2018-07-25 513 sizeof(*arch_policy_entry), GFP_KERNEL);
b4c0791e Nayna Jain 2018-07-25 514
b4c0791e Nayna Jain 2018-07-25 515 /* Convert arch policy string rules to struct ima_rule_entry format */
b4c0791e Nayna Jain 2018-07-25 516 for (rules = arch_rules, i = 0; *rules != NULL; rules++) {
b4c0791e Nayna Jain 2018-07-25 517 char rule[255];
b4c0791e Nayna Jain 2018-07-25 518 int result;
b4c0791e Nayna Jain 2018-07-25 519
b4c0791e Nayna Jain 2018-07-25 520 result = strlcpy(rule, *rules, sizeof(rule));
b4c0791e Nayna Jain 2018-07-25 521
b4c0791e Nayna Jain 2018-07-25 @522 INIT_LIST_HEAD(&arch_policy_entry[i].list);
b4c0791e Nayna Jain 2018-07-25 523 result = ima_parse_rule(rule, &arch_policy_entry[i]);
b4c0791e Nayna Jain 2018-07-25 524 if (result) {
b4c0791e Nayna Jain 2018-07-25 525 pr_warn("Skipping unknown architecture policy rule: %s\n", rule);
b4c0791e Nayna Jain 2018-07-25 526 memset(&arch_policy_entry[i], 0,
b4c0791e Nayna Jain 2018-07-25 527 sizeof(*arch_policy_entry));
b4c0791e Nayna Jain 2018-07-25 528 continue;
b4c0791e Nayna Jain 2018-07-25 529 }
b4c0791e Nayna Jain 2018-07-25 530 arch_policy_rules[i] = &arch_policy_entry[i];
b4c0791e Nayna Jain 2018-07-25 531 i++;
b4c0791e Nayna Jain 2018-07-25 532 }
b4c0791e Nayna Jain 2018-07-25 533 return i;
b4c0791e Nayna Jain 2018-07-25 534 }
b4c0791e Nayna Jain 2018-07-25 535

:::::: The code at line 522 was first introduced by commit
:::::: b4c0791e0facd968a3e0502a8a544390025a9a38 ima: add support for arch specific policies

:::::: TO: Nayna Jain <nayna@linux.vnet.ibm.com>
:::::: CC: 0day robot <lkp@intel.com>

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

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