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authorRichard Guy Briggs <rgb@redhat.com>2014-12-23 13:02:04 -0500
committerPaul Moore <pmoore@redhat.com>2014-12-23 16:40:18 -0500
commit041d7b98ffe59c59fdd639931dea7d74f9aa9a59 (patch)
tree1655d8bc82a0fcbf4f1d4e118aa1b6daeed6f9e0
parent4a92843601ad0f5067f441d2f0dca55bbe18c076 (diff)
downloadlinux-041d7b98ffe59c59fdd639931dea7d74f9aa9a59.tar.gz
audit: restore AUDIT_LOGINUID unset ABI
A regression was caused by commit 780a7654cee8: audit: Make testing for a valid loginuid explicit. (which in turn attempted to fix a regression caused by e1760bd) When audit_krule_to_data() fills in the rules to get a listing, there was a missing clause to convert back from AUDIT_LOGINUID_SET to AUDIT_LOGINUID. This broke userspace by not returning the same information that was sent and expected. The rule: auditctl -a exit,never -F auid=-1 gives: auditctl -l LIST_RULES: exit,never f24=0 syscall=all when it should give: LIST_RULES: exit,never auid=-1 (0xffffffff) syscall=all Tag it so that it is reported the same way it was set. Create a new private flags audit_krule field (pflags) to store it that won't interact with the public one from the API. Cc: stable@vger.kernel.org # v3.10-rc1+ Signed-off-by: Richard Guy Briggs <rgb@redhat.com> Signed-off-by: Paul Moore <pmoore@redhat.com>
-rw-r--r--include/linux/audit.h4
-rw-r--r--kernel/auditfilter.c10
2 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/audit.h b/include/linux/audit.h
index 36dffeccebdb..93331929d643 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -47,6 +47,7 @@ struct sk_buff;
struct audit_krule {
int vers_ops;
+ u32 pflags;
u32 flags;
u32 listnr;
u32 action;
@@ -64,6 +65,9 @@ struct audit_krule {
u64 prio;
};
+/* Flag to indicate legacy AUDIT_LOGINUID unset usage */
+#define AUDIT_LOGINUID_LEGACY 0x1
+
struct audit_field {
u32 type;
union {
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index c0d148bd7a5c..103586e239a2 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -442,6 +442,7 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
if ((f->type == AUDIT_LOGINUID) && (f->val == AUDIT_UID_UNSET)) {
f->type = AUDIT_LOGINUID_SET;
f->val = 0;
+ entry->rule.pflags |= AUDIT_LOGINUID_LEGACY;
}
err = audit_field_valid(entry, f);
@@ -617,6 +618,13 @@ static struct audit_rule_data *audit_krule_to_data(struct audit_krule *krule)
data->buflen += data->values[i] =
audit_pack_string(&bufp, krule->filterkey);
break;
+ case AUDIT_LOGINUID_SET:
+ if (krule->pflags & AUDIT_LOGINUID_LEGACY && !f->val) {
+ data->fields[i] = AUDIT_LOGINUID;
+ data->values[i] = AUDIT_UID_UNSET;
+ break;
+ }
+ /* fallthrough if set */
default:
data->values[i] = f->val;
}
@@ -633,6 +641,7 @@ static int audit_compare_rule(struct audit_krule *a, struct audit_krule *b)
int i;
if (a->flags != b->flags ||
+ a->pflags != b->pflags ||
a->listnr != b->listnr ||
a->action != b->action ||
a->field_count != b->field_count)
@@ -751,6 +760,7 @@ struct audit_entry *audit_dupe_rule(struct audit_krule *old)
new = &entry->rule;
new->vers_ops = old->vers_ops;
new->flags = old->flags;
+ new->pflags = old->pflags;
new->listnr = old->listnr;
new->action = old->action;
for (i = 0; i < AUDIT_BITMASK_SIZE; i++)