[PATCH 2/2] 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.
Cc: stable(a)vger.kernel.org # v3.10-rc1+
Signed-off-by: Richard Guy Briggs <rgb(a)redhat.com>
---
include/linux/audit.h | 3 +++
kernel/auditfilter.c | 10 +++++++++-
2 files changed, 12 insertions(+), 1 deletions(-)
diff --git a/include/linux/audit.h b/include/linux/audit.h
index eefc39a..d905832 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -63,6 +63,9 @@ struct audit_krule {
u64 prio;
};
+/* Flag to indicate legacy AUDIT_LOGINUID unset usage */
+#define AUDIT_LOGINUID_LEGACY 0x80000000
+
struct audit_field {
u32 type;
union {
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index fb4d2df..ea62c7b 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.flags |= AUDIT_LOGINUID_LEGACY;
}
if ((f->type == AUDIT_PID) || (f->type == AUDIT_PPID)) {
@@ -592,7 +593,7 @@ static struct audit_rule_data *audit_krule_to_data(struct audit_krule
*krule)
return NULL;
memset(data, 0, sizeof(*data));
- data->flags = krule->flags | krule->listnr;
+ data->flags = (krule->flags & ~AUDIT_LOGINUID_LEGACY) | krule->listnr;
data->action = krule->action;
data->field_count = krule->field_count;
bufp = data->buf;
@@ -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->flags & 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;
}
--
1.7.1