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https://github.com/adulau/aha.git
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sanitize audit_ipc_obj()
* get rid of allocations * make it return void * simplify callers Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
parent
f3298dc4f2
commit
a33e675100
4 changed files with 45 additions and 65 deletions
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@ -443,7 +443,7 @@ extern int audit_set_loginuid(struct task_struct *task, uid_t loginuid);
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#define audit_get_loginuid(t) ((t)->loginuid)
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#define audit_get_sessionid(t) ((t)->sessionid)
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extern void audit_log_task_context(struct audit_buffer *ab);
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extern int __audit_ipc_obj(struct kern_ipc_perm *ipcp);
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extern void __audit_ipc_obj(struct kern_ipc_perm *ipcp);
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extern int __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode);
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extern int audit_bprm(struct linux_binprm *bprm);
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extern void audit_socketcall(int nargs, unsigned long *args);
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@ -460,11 +460,10 @@ extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
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const struct cred *old);
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extern int __audit_log_capset(pid_t pid, const struct cred *new, const struct cred *old);
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static inline int audit_ipc_obj(struct kern_ipc_perm *ipcp)
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static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
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{
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if (unlikely(!audit_dummy_context()))
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return __audit_ipc_obj(ipcp);
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return 0;
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__audit_ipc_obj(ipcp);
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}
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static inline int audit_fd_pair(int fd1, int fd2)
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{
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@ -546,7 +545,7 @@ extern int audit_signals;
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#define audit_get_loginuid(t) (-1)
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#define audit_get_sessionid(t) (-1)
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#define audit_log_task_context(b) do { ; } while (0)
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#define audit_ipc_obj(i) ({ 0; })
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#define audit_ipc_obj(i) ((void)0)
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#define audit_ipc_set_perm(q,u,g,m) ({ 0; })
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#define audit_bprm(p) ({ 0; })
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#define audit_socketcall(n,a) ((void)0)
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@ -747,9 +747,7 @@ asmlinkage long sys_shmctl(int shmid, int cmd, struct shmid_ds __user *buf)
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goto out;
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}
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err = audit_ipc_obj(&(shp->shm_perm));
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if (err)
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goto out_unlock;
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audit_ipc_obj(&(shp->shm_perm));
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if (!capable(CAP_IPC_LOCK)) {
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uid_t euid = current_euid();
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@ -624,10 +624,9 @@ void ipc_rcu_putref(void *ptr)
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int ipcperms (struct kern_ipc_perm *ipcp, short flag)
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{ /* flag will most probably be 0 or S_...UGO from <linux/stat.h> */
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uid_t euid = current_euid();
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int requested_mode, granted_mode, err;
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int requested_mode, granted_mode;
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if (unlikely((err = audit_ipc_obj(ipcp))))
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return err;
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audit_ipc_obj(ipcp);
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requested_mode = (flag >> 6) | (flag >> 3) | flag;
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granted_mode = ipcp->mode;
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if (euid == ipcp->cuid ||
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@ -803,9 +802,7 @@ struct kern_ipc_perm *ipcctl_pre_down(struct ipc_ids *ids, int id, int cmd,
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goto out_up;
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}
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err = audit_ipc_obj(ipcp);
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if (err)
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goto out_unlock;
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audit_ipc_obj(ipcp);
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if (cmd == IPC_SET) {
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err = audit_ipc_set_perm(extra_perm, perm->uid,
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@ -247,6 +247,12 @@ struct audit_context {
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int nargs;
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long args[6];
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} socketcall;
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struct {
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uid_t uid;
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gid_t gid;
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mode_t mode;
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u32 osid;
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} ipc;
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};
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#if AUDIT_DEBUG
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@ -605,19 +611,12 @@ static int audit_filter_rules(struct task_struct *tsk,
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}
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}
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/* Find ipc objects that match */
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if (ctx) {
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struct audit_aux_data *aux;
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for (aux = ctx->aux; aux;
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aux = aux->next) {
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if (aux->type == AUDIT_IPC) {
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struct audit_aux_data_ipcctl *axi = (void *)aux;
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if (security_audit_rule_match(axi->osid, f->type, f->op, f->lsm_rule, ctx)) {
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++result;
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break;
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}
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}
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}
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}
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if (!ctx || ctx->type != AUDIT_IPC)
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break;
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if (security_audit_rule_match(ctx->ipc.osid,
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f->type, f->op,
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f->lsm_rule, ctx))
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++result;
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}
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break;
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case AUDIT_ARG0:
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@ -1228,7 +1227,7 @@ static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
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audit_log_format(ab, " cap_fe=%d cap_fver=%x", name->fcap.fE, name->fcap_ver);
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}
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static void show_special(struct audit_context *context)
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static void show_special(struct audit_context *context, int *call_panic)
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{
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struct audit_buffer *ab;
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int i;
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@ -1245,6 +1244,23 @@ static void show_special(struct audit_context *context)
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audit_log_format(ab, " a%d=%lx", i,
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context->socketcall.args[i]);
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break; }
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case AUDIT_IPC: {
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u32 osid = context->ipc.osid;
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audit_log_format(ab, "ouid=%u ogid=%u mode=%#o",
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context->ipc.uid, context->ipc.gid, context->ipc.mode);
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if (osid) {
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char *ctx = NULL;
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u32 len;
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if (security_secid_to_secctx(osid, &ctx, &len)) {
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audit_log_format(ab, " osid=%u", osid);
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*call_panic = 1;
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} else {
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audit_log_format(ab, " obj=%s", ctx);
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security_release_secctx(ctx, len);
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}
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}
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break; }
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}
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audit_log_end(ab);
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}
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@ -1363,26 +1379,6 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
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axi->mqstat.mq_msgsize, axi->mqstat.mq_curmsgs);
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break; }
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case AUDIT_IPC: {
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struct audit_aux_data_ipcctl *axi = (void *)aux;
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audit_log_format(ab,
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"ouid=%u ogid=%u mode=%#o",
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axi->uid, axi->gid, axi->mode);
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if (axi->osid != 0) {
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char *ctx = NULL;
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u32 len;
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if (security_secid_to_secctx(
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axi->osid, &ctx, &len)) {
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audit_log_format(ab, " osid=%u",
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axi->osid);
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call_panic = 1;
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} else {
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audit_log_format(ab, " obj=%s", ctx);
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security_release_secctx(ctx, len);
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}
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}
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break; }
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case AUDIT_IPC_SET_PERM: {
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struct audit_aux_data_ipcctl *axi = (void *)aux;
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audit_log_format(ab,
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@ -1427,7 +1423,7 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
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}
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if (context->type)
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show_special(context);
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show_special(context, &call_panic);
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if (context->sockaddr_len) {
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ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR);
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@ -2349,25 +2345,15 @@ int __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
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* audit_ipc_obj - record audit data for ipc object
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* @ipcp: ipc permissions
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*
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* Returns 0 for success or NULL context or < 0 on error.
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*/
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int __audit_ipc_obj(struct kern_ipc_perm *ipcp)
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void __audit_ipc_obj(struct kern_ipc_perm *ipcp)
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{
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struct audit_aux_data_ipcctl *ax;
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struct audit_context *context = current->audit_context;
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ax = kmalloc(sizeof(*ax), GFP_ATOMIC);
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if (!ax)
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return -ENOMEM;
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ax->uid = ipcp->uid;
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ax->gid = ipcp->gid;
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ax->mode = ipcp->mode;
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security_ipc_getsecid(ipcp, &ax->osid);
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ax->d.type = AUDIT_IPC;
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ax->d.next = context->aux;
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context->aux = (void *)ax;
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return 0;
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context->ipc.uid = ipcp->uid;
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context->ipc.gid = ipcp->gid;
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context->ipc.mode = ipcp->mode;
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security_ipc_getsecid(ipcp, &context->ipc.osid);
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context->type = AUDIT_IPC;
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}
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/**
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