path: root/kernel/audit.c
diff options
authorLinus Torvalds <>2014-10-19 16:25:56 -0700
committerLinus Torvalds <>2014-10-19 16:25:56 -0700
commitab074ade9c33b3585da86d62e87bcb3e897a3f54 (patch)
tree142b42182889c64813af997b8701707a3397e834 /kernel/audit.c
parent61ed53deb1c6a4386d8710dbbfcee8779c381931 (diff)
parent2991dd2b0117e864f394c826af6df144206ce0db (diff)
Merge git://
Pull audit updates from Eric Paris: "So this change across a whole bunch of arches really solves one basic problem. We want to audit when seccomp is killing a process. seccomp hooks in before the audit syscall entry code. audit_syscall_entry took as an argument the arch of the given syscall. Since the arch is part of what makes a syscall number meaningful it's an important part of the record, but it isn't available when seccomp shoots the syscall... For most arch's we have a better way to get the arch (syscall_get_arch) So the solution was two fold: Implement syscall_get_arch() everywhere there is audit which didn't have it. Use syscall_get_arch() in the seccomp audit code. Having syscall_get_arch() everywhere meant it was a useless flag on the stack and we could get rid of it for the typical syscall entry. The other changes inside the audit system aren't grand, fixed some records that had invalid spaces. Better locking around the task comm field. Removing some dead functions and structs. Make some things static. Really minor stuff" * git:// (31 commits) audit: rename audit_log_remove_rule to disambiguate for trees audit: cull redundancy in audit_rule_change audit: WARN if audit_rule_change called illegally audit: put rule existence check in canonical order next: openrisc: Fix build audit: get comm using lock to avoid race in string printing audit: remove open_arg() function that is never used audit: correct AUDIT_GET_FEATURE return message type audit: set nlmsg_len for multicast messages. audit: use union for audit_field values since they are mutually exclusive audit: invalid op= values for rules audit: use atomic_t to simplify audit_serial() kernel/audit.c: use ARRAY_SIZE instead of sizeof/sizeof[0] audit: reduce scope of audit_log_fcaps audit: reduce scope of audit_net_id audit: arm64: Remove the audit arch argument to audit_syscall_entry arm64: audit: Add audit hook in syscall_trace_enter/exit() audit: x86: drop arch from __audit_syscall_entry() interface sparc: implement is_32bit_task sparc: properly conditionalize use of TIF_32BIT ...
Diffstat (limited to 'kernel/audit.c')
1 files changed, 10 insertions, 20 deletions
diff --git a/kernel/audit.c b/kernel/audit.c
index ba2ff5a5c600..80983df92cd4 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -126,7 +126,7 @@ static atomic_t audit_lost = ATOMIC_INIT(0);
/* The netlink socket. */
static struct sock *audit_sock;
-int audit_net_id;
+static int audit_net_id;
/* Hash for inode-based rules */
struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
@@ -724,7 +724,7 @@ static int audit_get_feature(struct sk_buff *skb)
seq = nlmsg_hdr(skb)->nlmsg_seq;
- audit_send_reply(skb, seq, AUDIT_GET, 0, 0, &af, sizeof(af));
+ audit_send_reply(skb, seq, AUDIT_GET_FEATURE, 0, 0, &af, sizeof(af));
return 0;
@@ -750,7 +750,7 @@ static int audit_set_feature(struct sk_buff *skb)
struct audit_features *uaf;
int i;
- BUILD_BUG_ON(AUDIT_LAST_FEATURE + 1 > sizeof(audit_feature_names)/sizeof(audit_feature_names[0]));
+ BUILD_BUG_ON(AUDIT_LAST_FEATURE + 1 > ARRAY_SIZE(audit_feature_names));
uaf = nlmsg_data(nlmsg_hdr(skb));
/* if there is ever a version 2 we should handle that here */
@@ -1301,19 +1301,9 @@ err:
unsigned int audit_serial(void)
- static DEFINE_SPINLOCK(serial_lock);
- static unsigned int serial = 0;
+ static atomic_t serial = ATOMIC_INIT(0);
- unsigned long flags;
- unsigned int ret;
- spin_lock_irqsave(&serial_lock, flags);
- do {
- ret = ++serial;
- } while (unlikely(!ret));
- spin_unlock_irqrestore(&serial_lock, flags);
- return ret;
+ return atomic_add_return(1, &serial);
static inline void audit_get_stamp(struct audit_context *ctx,
@@ -1681,7 +1671,7 @@ void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap)
-void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
+static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
kernel_cap_t *perm = &name->fcap.permitted;
kernel_cap_t *inh = &name->fcap.inheritable;
@@ -1860,7 +1850,7 @@ EXPORT_SYMBOL(audit_log_task_context);
void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk)
const struct cred *cred;
- char name[sizeof(tsk->comm)];
+ char comm[sizeof(tsk->comm)];
struct mm_struct *mm = tsk->mm;
char *tty;
@@ -1894,9 +1884,8 @@ void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk)
from_kgid(&init_user_ns, cred->fsgid),
tty, audit_get_sessionid(tsk));
- get_task_comm(name, tsk);
audit_log_format(ab, " comm=");
- audit_log_untrustedstring(ab, name);
+ audit_log_untrustedstring(ab, get_task_comm(comm, tsk));
if (mm) {
@@ -1959,6 +1948,7 @@ void audit_log_end(struct audit_buffer *ab)
} else {
struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
+ nlh->nlmsg_len = ab->skb->len;
@@ -1970,7 +1960,7 @@ void audit_log_end(struct audit_buffer *ab)
* protocol between the kaudit kernel subsystem and the auditd
* userspace code.
- nlh->nlmsg_len = ab->skb->len - NLMSG_HDRLEN;
+ nlh->nlmsg_len -= NLMSG_HDRLEN;
if (audit_pid) {
skb_queue_tail(&audit_skb_queue, ab->skb);