seccomp: use a static inline for a function stub

[karo-tx-linux.git] / fs / exec.c

diff --git a/fs/exec.c b/fs/exec.c
index 9a1d9f0a60abf77a55df5bef051047a23ef853d0..d038968b54b420a3844c6e07f6bf25bee34d7e5c 100644 (file)
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1245,6 +1245,13 @@ static int check_unsafe_exec(struct linux_binprm *bprm)
                        bprm->unsafe |= LSM_UNSAFE_PTRACE;
        }
 
+       /*
+        * This isn't strictly necessary, but it makes it harder for LSMs to
+        * mess up.
+        */
+       if (current->no_new_privs)
+               bprm->unsafe |= LSM_UNSAFE_NO_NEW_PRIVS;
+
        n_fs = 1;
        spin_lock(&p->fs->lock);
        rcu_read_lock();
@@ -1288,7 +1295,8 @@ int prepare_binprm(struct linux_binprm *bprm)
        bprm->cred->euid = current_euid();
        bprm->cred->egid = current_egid();
 
-       if (!(bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID)) {
+       if (!(bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID) &&
+           !current->no_new_privs) {
                /* Set-uid? */
                if (mode & S_ISUID) {
                        bprm->per_clear |= PER_CLEAR_ON_SETID;
@@ -1371,7 +1379,7 @@ int search_binary_handler(struct linux_binprm *bprm,struct pt_regs *regs)
        unsigned int depth = bprm->recursion_depth;
        int try,retval;
        struct linux_binfmt *fmt;
-       pid_t old_pid;
+       pid_t old_pid, old_vpid;
 
        retval = security_bprm_check(bprm);
        if (retval)
@@ -1382,8 +1390,9 @@ int search_binary_handler(struct linux_binprm *bprm,struct pt_regs *regs)
                return retval;
 
        /* Need to fetch pid before load_binary changes it */
+       old_pid = current->pid;
        rcu_read_lock();
-       old_pid = task_pid_nr_ns(current, task_active_pid_ns(current->parent));
+       old_vpid = task_pid_nr_ns(current, task_active_pid_ns(current->parent));
        rcu_read_unlock();
 
        retval = -ENOENT;
@@ -1406,7 +1415,7 @@ int search_binary_handler(struct linux_binprm *bprm,struct pt_regs *regs)
                        if (retval >= 0) {
                                if (depth == 0) {
                                        trace_sched_process_exec(current, old_pid, bprm);
-                                       ptrace_event(PTRACE_EVENT_EXEC, old_pid);
+                                       ptrace_event(PTRACE_EVENT_EXEC, old_vpid);
                                }
                                put_binfmt(fmt);
                                allow_write_access(bprm->file);