diff options
| -rw-r--r-- | kernel/seccomp.c | 4 | ||||
| -rw-r--r-- | security/security.c | 7 | ||||
| -rw-r--r-- | security/yama/yama_lsm.c | 4 |
3 files changed, 14 insertions, 1 deletions
diff --git a/kernel/seccomp.c b/kernel/seccomp.c index d7f538847b84..e815781ed751 100644 --- a/kernel/seccomp.c +++ b/kernel/seccomp.c @@ -976,6 +976,9 @@ static int seccomp_notify_release(struct inode *inode, struct file *file) struct seccomp_filter *filter = file->private_data; struct seccomp_knotif *knotif; + if (!filter) + return 0; + mutex_lock(&filter->notify_lock); /* @@ -1300,6 +1303,7 @@ out: out_put_fd: if (flags & SECCOMP_FILTER_FLAG_NEW_LISTENER) { if (ret < 0) { + listener_f->private_data = NULL; fput(listener_f); put_unused_fd(listener); } else { diff --git a/security/security.c b/security/security.c index f1b8d2587639..55bc49027ba9 100644 --- a/security/security.c +++ b/security/security.c @@ -1027,6 +1027,13 @@ int security_cred_alloc_blank(struct cred *cred, gfp_t gfp) void security_cred_free(struct cred *cred) { + /* + * There is a failure case in prepare_creds() that + * may result in a call here with ->security being NULL. + */ + if (unlikely(cred->security == NULL)) + return; + call_void_hook(cred_free, cred); } diff --git a/security/yama/yama_lsm.c b/security/yama/yama_lsm.c index ffda91a4a1aa..02514fe558b4 100644 --- a/security/yama/yama_lsm.c +++ b/security/yama/yama_lsm.c @@ -368,7 +368,9 @@ static int yama_ptrace_access_check(struct task_struct *child, break; case YAMA_SCOPE_RELATIONAL: rcu_read_lock(); - if (!task_is_descendant(current, child) && + if (!pid_alive(child)) + rc = -EPERM; + if (!rc && !task_is_descendant(current, child) && !ptracer_exception_found(current, child) && !ns_capable(__task_cred(child)->user_ns, CAP_SYS_PTRACE)) rc = -EPERM; |