The strlcpy() reads the entire source buffer first, it is dangerous if the source buffer lenght is unbounded or possibility non NULL-terminated. It can lead to linear read overflows, crashes, etc... As recommended in the deprecated interfaces [1], it should be replaced by strscpy. This commit replaces all calls to strlcpy that handle the return values by the corresponding strscpy calls with new handling of the return values (as it is quite different between the two functions). [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy Signed-off-by: Romain Perier <romain.perier@xxxxxxxxx> --- security/integrity/ima/ima_policy.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c index 9b45d064a87d..1a905b8b064f 100644 --- a/security/integrity/ima/ima_policy.c +++ b/security/integrity/ima/ima_policy.c @@ -790,8 +790,14 @@ static int __init ima_init_arch_policy(void) for (rules = arch_rules, i = 0; *rules != NULL; rules++) { char rule[255]; int result; + ssize_t len; - result = strlcpy(rule, *rules, sizeof(rule)); + len = strscpy(rule, *rules, sizeof(rule)); + if (len == -E2BIG) { + pr_warn("Internal copy of architecture policy rule '%s' " + "failed. Skipping.\n", *rules); + continue; + } INIT_LIST_HEAD(&arch_policy_entry[i].list); result = ima_parse_rule(rule, &arch_policy_entry[i]);
