diff options
Diffstat (limited to 'kernel/pid.c')
| -rw-r--r-- | kernel/pid.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/kernel/pid.c b/kernel/pid.c index ebdf9c60cd0b..efe87db44683 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -550,13 +550,21 @@ struct pid *pidfd_get_pid(unsigned int fd, unsigned int *flags) * Note, that this function can only be called after the fd table has * been unshared to avoid leaking the pidfd to the new process. * + * This symbol should not be explicitly exported to loadable modules. + * * Return: On success, a cloexec pidfd is returned. * On error, a negative errno number will be returned. */ -static int pidfd_create(struct pid *pid, unsigned int flags) +int pidfd_create(struct pid *pid, unsigned int flags) { int fd; + if (!pid || !pid_has_task(pid, PIDTYPE_TGID)) + return -EINVAL; + + if (flags & ~(O_NONBLOCK | O_RDWR | O_CLOEXEC)) + return -EINVAL; + fd = anon_inode_getfd("[pidfd]", &pidfd_fops, get_pid(pid), flags | O_RDWR | O_CLOEXEC); if (fd < 0) @@ -596,10 +604,7 @@ SYSCALL_DEFINE2(pidfd_open, pid_t, pid, unsigned int, flags) if (!p) return -ESRCH; - if (pid_has_task(p, PIDTYPE_TGID)) - fd = pidfd_create(p, flags); - else - fd = -EINVAL; + fd = pidfd_create(p, flags); put_pid(p); return fd; |