[PATCH 1/2] 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(a)vger.kernel.org # v3.10-rc1+
Signed-off-by: Richard Guy Briggs <rgb(a)redhat.com>
---
include/linux/audit.h | 4 ++++
kernel/auditfilter.c | 10 ++++++++++
2 files changed, 14 insertions(+), 0 deletions(-)
diff --git a/include/linux/audit.h b/include/linux/audit.h
index eefc39a..b481779 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -46,6 +46,7 @@ struct audit_tree;
struct sk_buff;
struct audit_krule {
+ u32 pflags;
u32 flags;
u32 listnr;
u32 action;
@@ -63,6 +64,9 @@ 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 fb4d2df..ecb05d3 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -441,6 +441,7 @@ 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;
}
if ((f->type == AUDIT_PID) || (f->type == AUDIT_PPID)) {
@@ -629,6 +630,13 @@ 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;
}
@@ -645,6 +653,7 @@ 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)
@@ -762,6 +771,7 @@ struct audit_entry *audit_dupe_rule(struct audit_krule *old)
new = &entry->rule;
new->flags = old->flags;
+ new->pflags = old->pflags;
new->listnr = old->listnr;
new->action = old->action;
for (i = 0; i < AUDIT_BITMASK_SIZE; i++)
--
1.7.1