diff options
| author | Eric W. Biederman <ebiederm@xmission.com> | 2012-09-10 23:10:16 -0700 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2012-09-17 18:03:31 -0700 |
| commit | 02276bda4a2bf094fcde89fb5db4d9e86347ebf4 (patch) | |
| tree | 7f06da4dd9757c353133b9c512334daf96cfec1e | |
| parent | 34e36d8ecbd958bc15f8e63deade1227de337eb1 (diff) | |
| download | linux-02276bda4a2bf094fcde89fb5db4d9e86347ebf4.tar.bz2 | |
audit: Use current instead of NETLINK_CREDS() in audit_filter
Get caller process uid and gid and pid values from the current task
instead of the NETLINK_CB. This is simpler than passing NETLINK_CREDS
from from audit_receive_msg to audit_filter_user_rules and avoid the
chance of being hit by the occassional bugs in netlink uid/gid
credential passing. This is a safe changes because all netlink
requests are processed in the task of the sending process.
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Eric Paris <eparis@redhat.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
| -rw-r--r-- | include/linux/audit.h | 2 | ||||
| -rw-r--r-- | kernel/audit.c | 2 | ||||
| -rw-r--r-- | kernel/auditfilter.c | 13 |
3 files changed, 8 insertions, 9 deletions
diff --git a/include/linux/audit.h b/include/linux/audit.h index 36abf2aa7e68..9c9af0e95f93 100644 --- a/include/linux/audit.h +++ b/include/linux/audit.h @@ -700,7 +700,7 @@ extern void audit_log_secctx(struct audit_buffer *ab, u32 secid); extern int audit_update_lsm_rules(void); /* Private API (for audit.c only) */ -extern int audit_filter_user(struct netlink_skb_parms *cb); +extern int audit_filter_user(void); extern int audit_filter_type(int type); extern int audit_receive_filter(int type, int pid, int uid, int seq, void *data, size_t datasz, uid_t loginuid, diff --git a/kernel/audit.c b/kernel/audit.c index 7b7268e3073b..fecb1507b485 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -744,7 +744,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) if (!audit_enabled && msg_type != AUDIT_USER_AVC) return 0; - err = audit_filter_user(&NETLINK_CB(skb)); + err = audit_filter_user(); if (err == 1) { err = 0; if (msg_type == AUDIT_USER_TTY) { diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c index a6c3f1abd206..b754f43bc56c 100644 --- a/kernel/auditfilter.c +++ b/kernel/auditfilter.c @@ -1236,8 +1236,7 @@ int audit_compare_dname_path(const char *dname, const char *path, return strncmp(p, dname, dlen); } -static int audit_filter_user_rules(struct netlink_skb_parms *cb, - struct audit_krule *rule, +static int audit_filter_user_rules(struct audit_krule *rule, enum audit_state *state) { int i; @@ -1249,13 +1248,13 @@ static int audit_filter_user_rules(struct netlink_skb_parms *cb, switch (f->type) { case AUDIT_PID: - result = audit_comparator(cb->creds.pid, f->op, f->val); + result = audit_comparator(task_pid_vnr(current), f->op, f->val); break; case AUDIT_UID: - result = audit_comparator(cb->creds.uid, f->op, f->val); + result = audit_comparator(current_uid(), f->op, f->val); break; case AUDIT_GID: - result = audit_comparator(cb->creds.gid, f->op, f->val); + result = audit_comparator(current_gid(), f->op, f->val); break; case AUDIT_LOGINUID: result = audit_comparator(audit_get_loginuid(current), @@ -1287,7 +1286,7 @@ static int audit_filter_user_rules(struct netlink_skb_parms *cb, return 1; } -int audit_filter_user(struct netlink_skb_parms *cb) +int audit_filter_user(void) { enum audit_state state = AUDIT_DISABLED; struct audit_entry *e; @@ -1295,7 +1294,7 @@ int audit_filter_user(struct netlink_skb_parms *cb) rcu_read_lock(); list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_USER], list) { - if (audit_filter_user_rules(cb, &e->rule, &state)) { + if (audit_filter_user_rules(&e->rule, &state)) { if (state == AUDIT_DISABLED) ret = 0; break; |