[PATCH v3 02/12] audit: widen ino fields to u64

Jeff Layton
2026-03-04T15:33:45Z

inode->i_ino is being widened from unsigned long to u64. The audit
subsystem uses unsigned long ino in struct fields, function parameters,
and local variables that store inode numbers from arbitrary filesystems.
On 32-bit platforms this truncates inode numbers that exceed 32 bits,
which will cause incorrect audit log entries and broken watch/mark
comparisons.

Widen all audit ino fields, parameters, and locals to u64, and update
the inode format string from %lu to %llu to match.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
include/linux/audit.h | 2 +-
kernel/audit.h | 13 ++++++-------
kernel/audit_fsnotify.c | 4 ++--
kernel/audit_watch.c | 12 ++++++------
kernel/auditsc.c | 4 ++--
5 files changed, 17 insertions(+), 18 deletions(-)

diff --git a/include/linux/audit.h b/include/linux/audit.h
index b642b5faca654c8465b6839c32b633426e1d3d9a..b915aaa7ed7399a6e453b1bb9bacbda686028638 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -15,7 +15,7 @@
#include <uapi/linux/audit.h>
#include <uapi/linux/fanotify.h>

-#define AUDIT_INO_UNSET ((unsigned long)-1)
+#define AUDIT_INO_UNSET ((u64)-1)
#define AUDIT_DEV_UNSET ((dev_t)-1)

struct audit_sig_info {
diff --git a/kernel/audit.h b/kernel/audit.h
index 7c401729e21bbcb062e2d5f3059d4496ed83529b..ac81fa02bcd7501e31461a346c4e599841525001 100644
--- a/kernel/audit.h
+++ b/kernel/audit.h
@@ -76,7 +76,7 @@ struct audit_names {
int name_len; /* number of chars to log */
bool hidden; /* don't log this record */

- unsigned long ino;
+ u64 ino;
dev_t dev;
umode_t mode;
kuid_t uid;
@@ -225,9 +225,9 @@ extern int auditd_test_task(struct task_struct *task);
#define AUDIT_INODE_BUCKETS 32
extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];

-static inline int audit_hash_ino(u32 ino)
+static inline int audit_hash_ino(u64 ino)
{
- return (ino & (AUDIT_INODE_BUCKETS-1));
+ return ((u32)ino & (AUDIT_INODE_BUCKETS-1));
}

/* Indicates that audit should log the full pathname. */
@@ -277,16 +277,15 @@ extern int audit_to_watch(struct audit_krule *krule, char *path, int len,
extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
extern void audit_remove_watch_rule(struct audit_krule *krule);
extern char *audit_watch_path(struct audit_watch *watch);
-extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino,
- dev_t dev);
+extern int audit_watch_compare(struct audit_watch *watch, u64 ino, dev_t dev);

extern struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule,
char *pathname, int len);
extern char *audit_mark_path(struct audit_fsnotify_mark *mark);
extern void audit_remove_mark(struct audit_fsnotify_mark *audit_mark);
extern void audit_remove_mark_rule(struct audit_krule *krule);
-extern int audit_mark_compare(struct audit_fsnotify_mark *mark,
- unsigned long ino, dev_t dev);
+extern int audit_mark_compare(struct audit_fsnotify_mark *mark, u64 ino,
+ dev_t dev);
extern int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old);
extern int audit_exe_compare(struct task_struct *tsk,
struct audit_fsnotify_mark *mark);
diff --git a/kernel/audit_fsnotify.c b/kernel/audit_fsnotify.c
index a4401f6510608119fd928944c36103326475e3b2..711454f9f7242847f78e7eeed92db7a66be265e6 100644
--- a/kernel/audit_fsnotify.c
+++ b/kernel/audit_fsnotify.c
@@ -25,7 +25,7 @@
*/
struct audit_fsnotify_mark {
dev_t dev; /* associated superblock device */
- unsigned long ino; /* associated inode number */
+ u64 ino; /* associated inode number */
char *path; /* insertion path */
struct fsnotify_mark mark; /* fsnotify mark on the inode */
struct audit_krule *rule;
@@ -57,7 +57,7 @@ char *audit_mark_path(struct audit_fsnotify_mark *mark)
return mark->path;
}

-int audit_mark_compare(struct audit_fsnotify_mark *mark, unsigned long ino, dev_t dev)
+int audit_mark_compare(struct audit_fsnotify_mark *mark, u64 ino, dev_t dev)
{
if (mark->ino == AUDIT_INO_UNSET)
return 0;
diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c
index 096faac2435ce2b3741fb1f623ea7fab65ae7a07..33577f0f54eff1eafe48a94dd2839b00fe7dffcc 100644
--- a/kernel/audit_watch.c
+++ b/kernel/audit_watch.c
@@ -37,7 +37,7 @@ struct audit_watch {
refcount_t count; /* reference count */
dev_t dev; /* associated superblock device */
char *path; /* insertion path */
- unsigned long ino; /* associated inode number */
+ u64 ino; /* associated inode number */
struct audit_parent *parent; /* associated parent */
struct list_head wlist; /* entry in parent->watches list */
struct list_head rules; /* anchor for krule->rlist */
@@ -125,7 +125,7 @@ char *audit_watch_path(struct audit_watch *watch)
return watch->path;
}

-int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev)
+int audit_watch_compare(struct audit_watch *watch, u64 ino, dev_t dev)
{
return (watch->ino != AUDIT_INO_UNSET) &&
(watch->ino == ino) &&
@@ -244,7 +244,7 @@ static void audit_watch_log_rule_change(struct audit_krule *r, struct audit_watc
/* Update inode info in audit rules based on filesystem event. */
static void audit_update_watch(struct audit_parent *parent,
const struct qstr *dname, dev_t dev,
- unsigned long ino, unsigned invalidating)
+ u64 ino, unsigned invalidating)
{
struct audit_watch *owatch, *nwatch, *nextw;
struct audit_krule *r, *nextr;
@@ -285,7 +285,7 @@ static void audit_update_watch(struct audit_parent *parent,
list_del(&oentry->rule.list);
audit_panic("error updating watch, removing");
} else {
- int h = audit_hash_ino((u32)ino);
+ int h = audit_hash_ino(ino);

/*
* nentry->rule.watch == oentry->rule.watch so
@@ -439,7 +439,7 @@ int audit_add_watch(struct audit_krule *krule, struct list_head **list)

audit_add_to_parent(krule, parent);

- h = audit_hash_ino((u32)watch->ino);
+ h = audit_hash_ino(watch->ino);
*list = &audit_inode_hash[h];
error:
path_put(&parent_path);
@@ -527,7 +527,7 @@ int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old)
int audit_exe_compare(struct task_struct *tsk, struct audit_fsnotify_mark *mark)
{
struct file *exe_file;
- unsigned long ino;
+ u64 ino;
dev_t dev;

/* only do exe filtering if we are recording @current events/records */
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index f6af6a8f68c4f6d14d9a899934138df2036e1f9a..ab54fccba215ca61d56335d1a22a7f26297e28ee 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -886,7 +886,7 @@ static int audit_filter_inode_name(struct task_struct *tsk,
struct audit_names *n,
struct audit_context *ctx)
{
- int h = audit_hash_ino((u32)n->ino);
+ int h = audit_hash_ino(n->ino);
struct list_head *list = &audit_inode_hash[h];

return __audit_filter_op(tsk, ctx, list, n, ctx->major);
@@ -1534,7 +1534,7 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n,
audit_log_format(ab, " name=(null)");

if (n->ino != AUDIT_INO_UNSET)
- audit_log_format(ab, " inode=%lu dev=%02x:%02x mode=%#ho ouid=%u ogid=%u rdev=%02x:%02x",
+ audit_log_format(ab, " inode=%llu dev=%02x:%02x mode=%#ho ouid=%u ogid=%u rdev=%02x:%02x",
n->ino,
MAJOR(n->dev),
MINOR(n->dev),

--
2.53.0