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[AUDIT] clean up audit_receive_msg()

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generally clean up audit_receive_msg() don't free random memory if
selinux_sid_to_string fails for some reason.  Move generic auditing
to a helper function

Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Eric Paris 2008-01-07 18:14:19 -05:00 committed by Al Viro
parent 1a6b9f2317
commit 50397bd1e4
1 changed files with 65 additions and 102 deletions
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167
kernel/audit.c
View file

@ -152,8 +152,10 @@ struct audit_buffer {
static void audit_set_pid(struct audit_buffer *ab, pid_t pid) static void audit_set_pid(struct audit_buffer *ab, pid_t pid)
{ {
struct nlmsghdr *nlh = nlmsg_hdr(ab->skb); if (ab) {
nlh->nlmsg_pid = pid; struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
nlh->nlmsg_pid = pid;
}
} }
void audit_panic(const char *message) void audit_panic(const char *message)
@ -511,6 +513,33 @@ static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type)
return err; return err;
} }
static int audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type,
u32 pid, u32 uid, uid_t auid, u32 sid)
{
int rc = 0;
char *ctx = NULL;
u32 len;
if (!audit_enabled) {
*ab = NULL;
return rc;
}
*ab = audit_log_start(NULL, GFP_KERNEL, msg_type);
audit_log_format(*ab, "user pid=%d uid=%u auid=%u",
pid, uid, auid);
if (sid) {
rc = selinux_sid_to_string(sid, &ctx, &len);
if (rc)
audit_log_format(*ab, " ssid=%u", sid);
else
audit_log_format(*ab, " subj=%s", ctx);
kfree(ctx);
}
return rc;
}
static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
{ {
u32 uid, pid, seq, sid; u32 uid, pid, seq, sid;
@ -521,7 +550,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
u16 msg_type = nlh->nlmsg_type; u16 msg_type = nlh->nlmsg_type;
uid_t loginuid; /* loginuid of sender */ uid_t loginuid; /* loginuid of sender */
struct audit_sig_info *sig_data; struct audit_sig_info *sig_data;
char *ctx; char *ctx = NULL;
u32 len; u32 len;
err = audit_netlink_ok(skb, msg_type); err = audit_netlink_ok(skb, msg_type);
@ -602,36 +631,22 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
if (err) if (err)
break; break;
} }
ab = audit_log_start(NULL, GFP_KERNEL, msg_type); audit_log_common_recv_msg(&ab, msg_type, pid, uid,
if (ab) { loginuid, sid);
audit_log_format(ab,
"user pid=%d uid=%u auid=%u",
pid, uid, loginuid);
if (sid) {
if (selinux_sid_to_string(
sid, &ctx, &len)) {
audit_log_format(ab,
" ssid=%u", sid);
/* Maybe call audit_panic? */
} else
audit_log_format(ab,
" subj=%s", ctx);
kfree(ctx);
}
if (msg_type != AUDIT_USER_TTY)
audit_log_format(ab, " msg='%.1024s'",
(char *)data);
else {
int size;
audit_log_format(ab, " msg="); if (msg_type != AUDIT_USER_TTY)
size = nlmsg_len(nlh); audit_log_format(ab, " msg='%.1024s'",
audit_log_n_untrustedstring(ab, size, (char *)data);
data); else {
} int size;
audit_set_pid(ab, pid);
audit_log_end(ab); audit_log_format(ab, " msg=");
size = nlmsg_len(nlh);
audit_log_n_untrustedstring(ab, size,
data);
} }
audit_set_pid(ab, pid);
audit_log_end(ab);
} }
break; break;
case AUDIT_ADD: case AUDIT_ADD:
@ -639,27 +654,12 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
if (nlmsg_len(nlh) < sizeof(struct audit_rule)) if (nlmsg_len(nlh) < sizeof(struct audit_rule))
return -EINVAL; return -EINVAL;
if (audit_enabled == AUDIT_LOCKED) { if (audit_enabled == AUDIT_LOCKED) {
ab = audit_log_start(NULL, GFP_KERNEL, audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
AUDIT_CONFIG_CHANGE); uid, loginuid, sid);
if (ab) {
audit_log_format(ab, audit_log_format(ab, " audit_enabled=%d res=0",
"pid=%d uid=%u auid=%u", audit_enabled);
pid, uid, loginuid); audit_log_end(ab);
if (sid) {
if (selinux_sid_to_string(
sid, &ctx, &len)) {
audit_log_format(ab,
" ssid=%u", sid);
/* Maybe call audit_panic? */
} else
audit_log_format(ab,
" subj=%s", ctx);
kfree(ctx);
}
audit_log_format(ab, " audit_enabled=%d res=0",
audit_enabled);
audit_log_end(ab);
}
return -EPERM; return -EPERM;
} }
/* fallthrough */ /* fallthrough */
@ -673,27 +673,12 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
if (nlmsg_len(nlh) < sizeof(struct audit_rule_data)) if (nlmsg_len(nlh) < sizeof(struct audit_rule_data))
return -EINVAL; return -EINVAL;
if (audit_enabled == AUDIT_LOCKED) { if (audit_enabled == AUDIT_LOCKED) {
ab = audit_log_start(NULL, GFP_KERNEL, audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
AUDIT_CONFIG_CHANGE); uid, loginuid, sid);
if (ab) {
audit_log_format(ab, audit_log_format(ab, " audit_enabled=%d res=0",
"pid=%d uid=%u auid=%u", audit_enabled);
pid, uid, loginuid); audit_log_end(ab);
if (sid) {
if (selinux_sid_to_string(
sid, &ctx, &len)) {
audit_log_format(ab,
" ssid=%u", sid);
/* Maybe call audit_panic? */
} else
audit_log_format(ab,
" subj=%s", ctx);
kfree(ctx);
}
audit_log_format(ab, " audit_enabled=%d res=0",
audit_enabled);
audit_log_end(ab);
}
return -EPERM; return -EPERM;
} }
/* fallthrough */ /* fallthrough */
@ -704,19 +689,10 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
break; break;
case AUDIT_TRIM: case AUDIT_TRIM:
audit_trim_trees(); audit_trim_trees();
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
if (!ab) audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
break; uid, loginuid, sid);
audit_log_format(ab, "auid=%u", loginuid);
if (sid) {
u32 len;
ctx = NULL;
if (selinux_sid_to_string(sid, &ctx, &len))
audit_log_format(ab, " ssid=%u", sid);
else
audit_log_format(ab, " subj=%s", ctx);
kfree(ctx);
}
audit_log_format(ab, " op=trim res=1"); audit_log_format(ab, " op=trim res=1");
audit_log_end(ab); audit_log_end(ab);
break; break;
@ -746,22 +722,9 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
/* OK, here comes... */ /* OK, here comes... */
err = audit_tag_tree(old, new); err = audit_tag_tree(old, new);
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE); audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
if (!ab) { uid, loginuid, sid);
kfree(old);
kfree(new);
break;
}
audit_log_format(ab, "auid=%u", loginuid);
if (sid) {
u32 len;
ctx = NULL;
if (selinux_sid_to_string(sid, &ctx, &len))
audit_log_format(ab, " ssid=%u", sid);
else
audit_log_format(ab, " subj=%s", ctx);
kfree(ctx);
}
audit_log_format(ab, " op=make_equiv old="); audit_log_format(ab, " op=make_equiv old=");
audit_log_untrustedstring(ab, old); audit_log_untrustedstring(ab, old);
audit_log_format(ab, " new="); audit_log_format(ab, " new=");