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-rw-r--r--kernel/auditsc.c124
1 files changed, 88 insertions, 36 deletions
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 14e295a4121b06..174a3f6248928e 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -200,12 +200,13 @@ struct audit_context {
#endif
};
-
+/* Determine if any context name data matches a rule's watch data */
/* Compare a task_struct with an audit_rule. Return 1 on match, 0
* otherwise. */
static int audit_filter_rules(struct task_struct *tsk,
struct audit_krule *rule,
struct audit_context *ctx,
+ struct audit_names *name,
enum audit_state *state)
{
int i, j, need_sid = 1;
@@ -268,7 +269,10 @@ static int audit_filter_rules(struct task_struct *tsk,
}
break;
case AUDIT_DEVMAJOR:
- if (ctx) {
+ if (name)
+ result = audit_comparator(MAJOR(name->dev),
+ f->op, f->val);
+ else if (ctx) {
for (j = 0; j < ctx->name_count; j++) {
if (audit_comparator(MAJOR(ctx->names[j].dev), f->op, f->val)) {
++result;
@@ -278,7 +282,10 @@ static int audit_filter_rules(struct task_struct *tsk,
}
break;
case AUDIT_DEVMINOR:
- if (ctx) {
+ if (name)
+ result = audit_comparator(MINOR(name->dev),
+ f->op, f->val);
+ else if (ctx) {
for (j = 0; j < ctx->name_count; j++) {
if (audit_comparator(MINOR(ctx->names[j].dev), f->op, f->val)) {
++result;
@@ -288,7 +295,10 @@ static int audit_filter_rules(struct task_struct *tsk,
}
break;
case AUDIT_INODE:
- if (ctx) {
+ if (name)
+ result = (name->ino == f->val ||
+ name->pino == f->val);
+ else if (ctx) {
for (j = 0; j < ctx->name_count; j++) {
if (audit_comparator(ctx->names[j].ino, f->op, f->val) ||
audit_comparator(ctx->names[j].pino, f->op, f->val)) {
@@ -298,6 +308,12 @@ static int audit_filter_rules(struct task_struct *tsk,
}
}
break;
+ case AUDIT_WATCH:
+ if (name && rule->watch->ino != (unsigned long)-1)
+ result = (name->dev == rule->watch->dev &&
+ (name->ino == rule->watch->ino ||
+ name->pino == rule->watch->ino));
+ break;
case AUDIT_LOGINUID:
result = 0;
if (ctx)
@@ -354,7 +370,7 @@ static enum audit_state audit_filter_task(struct task_struct *tsk)
rcu_read_lock();
list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) {
- if (audit_filter_rules(tsk, &e->rule, NULL, &state)) {
+ if (audit_filter_rules(tsk, &e->rule, NULL, NULL, &state)) {
rcu_read_unlock();
return state;
}
@@ -384,8 +400,9 @@ static enum audit_state audit_filter_syscall(struct task_struct *tsk,
int bit = AUDIT_BIT(ctx->major);
list_for_each_entry_rcu(e, list, list) {
- if ((e->rule.mask[word] & bit) == bit
- && audit_filter_rules(tsk, &e->rule, ctx, &state)) {
+ if ((e->rule.mask[word] & bit) == bit &&
+ audit_filter_rules(tsk, &e->rule, ctx, NULL,
+ &state)) {
rcu_read_unlock();
return state;
}
@@ -395,6 +412,49 @@ static enum audit_state audit_filter_syscall(struct task_struct *tsk,
return AUDIT_BUILD_CONTEXT;
}
+/* At syscall exit time, this filter is called if any audit_names[] have been
+ * collected during syscall processing. We only check rules in sublists at hash
+ * buckets applicable to the inode numbers in audit_names[].
+ * Regarding audit_state, same rules apply as for audit_filter_syscall().
+ */
+enum audit_state audit_filter_inodes(struct task_struct *tsk,
+ struct audit_context *ctx)
+{
+ int i;
+ struct audit_entry *e;
+ enum audit_state state;
+
+ if (audit_pid && tsk->tgid == audit_pid)
+ return AUDIT_DISABLED;
+
+ rcu_read_lock();
+ for (i = 0; i < ctx->name_count; i++) {
+ int word = AUDIT_WORD(ctx->major);
+ int bit = AUDIT_BIT(ctx->major);
+ struct audit_names *n = &ctx->names[i];
+ int h = audit_hash_ino((u32)n->ino);
+ struct list_head *list = &audit_inode_hash[h];
+
+ if (list_empty(list))
+ continue;
+
+ list_for_each_entry_rcu(e, list, list) {
+ if ((e->rule.mask[word] & bit) == bit &&
+ audit_filter_rules(tsk, &e->rule, ctx, n, &state)) {
+ rcu_read_unlock();
+ return state;
+ }
+ }
+ }
+ rcu_read_unlock();
+ return AUDIT_BUILD_CONTEXT;
+}
+
+void audit_set_auditable(struct audit_context *ctx)
+{
+ ctx->auditable = 1;
+}
+
static inline struct audit_context *audit_get_context(struct task_struct *tsk,
int return_valid,
int return_code)
@@ -408,11 +468,20 @@ static inline struct audit_context *audit_get_context(struct task_struct *tsk,
if (context->in_syscall && !context->auditable) {
enum audit_state state;
+
state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]);
+ if (state == AUDIT_RECORD_CONTEXT) {
+ context->auditable = 1;
+ goto get_context;
+ }
+
+ state = audit_filter_inodes(tsk, context);
if (state == AUDIT_RECORD_CONTEXT)
context->auditable = 1;
+
}
+get_context:
context->pid = tsk->pid;
context->ppid = sys_getppid(); /* sic. tsk == current in all cases */
context->uid = tsk->uid;
@@ -1142,37 +1211,20 @@ void __audit_inode_child(const char *dname, const struct inode *inode,
return;
/* determine matching parent */
- if (dname)
- for (idx = 0; idx < context->name_count; idx++)
- if (context->names[idx].pino == pino) {
- const char *n;
- const char *name = context->names[idx].name;
- int dlen = strlen(dname);
- int nlen = name ? strlen(name) : 0;
-
- if (nlen < dlen)
- continue;
-
- /* disregard trailing slashes */
- n = name + nlen - 1;
- while ((*n == '/') && (n > name))
- n--;
-
- /* find last path component */
- n = n - dlen + 1;
- if (n < name)
- continue;
- else if (n > name) {
- if (*--n != '/')
- continue;
- else
- n++;
- }
+ if (!dname)
+ goto no_match;
+ for (idx = 0; idx < context->name_count; idx++)
+ if (context->names[idx].pino == pino) {
+ const char *name = context->names[idx].name;
- if (strncmp(n, dname, dlen) == 0)
- goto update_context;
- }
+ if (!name)
+ continue;
+
+ if (audit_compare_dname_path(dname, name) == 0)
+ goto update_context;
+ }
+no_match:
/* catch-all in case match not found */
idx = context->name_count++;
context->names[idx].name = NULL;
generated by cgit 1.2.3-korg (git 2.39.0) at 2024-05-03 09:44:47 +0000