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Merge 5.2-rc7 into android-mainline

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Linux 5.2-rc7

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Greg Kroah-Hartman
2019-07-01 11:23:22 +02:00
committed by Alistair Delva
parent d5458786d8 6fbc7275c7
commit 96e821be4b
157 changed files with 1341 additions and 517 deletions
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64
kernel/fork.c
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@@ -249,7 +249,11 @@ static unsigned long *alloc_thread_stack_node(struct task_struct *tsk, int node)
struct page *page = alloc_pages_node(node, THREADINFO_GFP,
THREAD_SIZE_ORDER);
return page ? page_address(page) : NULL;
if (likely(page)) {
tsk->stack = page_address(page);
return tsk->stack;
}
return NULL;
#endif
}
@@ -1715,31 +1719,6 @@ const struct file_operations pidfd_fops = {
#endif
};
/**
* pidfd_create() - Create a new pid file descriptor.
*
* @pid: struct pid that the pidfd will reference
*
* This creates a new pid file descriptor with the O_CLOEXEC flag set.
*
* Note, that this function can only be called after the fd table has
* been unshared to avoid leaking the pidfd to the new process.
*
* Return: On success, a cloexec pidfd is returned.
* On error, a negative errno number will be returned.
*/
static int pidfd_create(struct pid *pid)
{
int fd;
fd = anon_inode_getfd("[pidfd]", &pidfd_fops, get_pid(pid),
O_RDWR | O_CLOEXEC);
if (fd < 0)
put_pid(pid);
return fd;
}
static void __delayed_free_task(struct rcu_head *rhp)
{
struct task_struct *tsk = container_of(rhp, struct task_struct, rcu);
@@ -1777,6 +1756,7 @@ static __latent_entropy struct task_struct *copy_process(
int pidfd = -1, retval;
struct task_struct *p;
struct multiprocess_signals delayed;
struct file *pidfile = NULL;
/*
* Don't allow sharing the root directory with processes in a different
@@ -1825,8 +1805,6 @@ static __latent_entropy struct task_struct *copy_process(
}
if (clone_flags & CLONE_PIDFD) {
int reserved;
/*
* - CLONE_PARENT_SETTID is useless for pidfds and also
* parent_tidptr is used to return pidfds.
@@ -1837,16 +1815,6 @@ static __latent_entropy struct task_struct *copy_process(
if (clone_flags &
(CLONE_DETACHED | CLONE_PARENT_SETTID | CLONE_THREAD))
return ERR_PTR(-EINVAL);
/*
* Verify that parent_tidptr is sane so we can potentially
* reuse it later.
*/
if (get_user(reserved, parent_tidptr))
return ERR_PTR(-EFAULT);
if (reserved != 0)
return ERR_PTR(-EINVAL);
}
/*
@@ -2063,11 +2031,20 @@ static __latent_entropy struct task_struct *copy_process(
* if the fd table isn't shared).
*/
if (clone_flags & CLONE_PIDFD) {
retval = pidfd_create(pid);
retval = get_unused_fd_flags(O_RDWR | O_CLOEXEC);
if (retval < 0)
goto bad_fork_free_pid;
pidfd = retval;
pidfile = anon_inode_getfile("[pidfd]", &pidfd_fops, pid,
O_RDWR | O_CLOEXEC);
if (IS_ERR(pidfile)) {
put_unused_fd(pidfd);
goto bad_fork_free_pid;
}
get_pid(pid); /* held by pidfile now */
retval = put_user(pidfd, parent_tidptr);
if (retval)
goto bad_fork_put_pidfd;
@@ -2185,6 +2162,9 @@ static __latent_entropy struct task_struct *copy_process(
goto bad_fork_cancel_cgroup;
}
/* past the last point of failure */
if (pidfile)
fd_install(pidfd, pidfile);
init_task_pid_links(p);
if (likely(p->pid)) {
@@ -2251,8 +2231,10 @@ bad_fork_cancel_cgroup:
bad_fork_cgroup_threadgroup_change_end:
cgroup_threadgroup_change_end(current);
bad_fork_put_pidfd:
if (clone_flags & CLONE_PIDFD)
ksys_close(pidfd);
if (clone_flags & CLONE_PIDFD) {
fput(pidfile);
put_unused_fd(pidfd);
}
bad_fork_free_pid:
if (pid != &init_struct_pid)
free_pid(pid);