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-rw-r--r--fs/exec.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/fs/exec.c b/fs/exec.c
index b1fd2025e59a..d038968b54b4 100644
--- 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;