Commit 5fec25f2 authored by Eric W. Biederman's avatar Eric W. Biederman

umh: Capture the pid in umh_pipe_setup

The pid in struct subprocess_info is only used by umh_clean_and_save_pid to
write the pid into umh_info.

Instead always capture the pid on struct umh_info in umh_pipe_setup, removing
code that is specific to user mode drivers from the common user path of
user mode helpers.

v1: https://lkml.kernel.org/r/87h7uygf9i.fsf_-_@x220.int.ebiederm.org
v2: https://lkml.kernel.org/r/875zb97iix.fsf_-_@x220.int.ebiederm.org
Link: https://lkml.kernel.org/r/20200702164140.4468-1-ebiederm@xmission.comReviewed-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
Tested-by: default avatarAlexei Starovoitov <ast@kernel.org>
Signed-off-by: default avatar"Eric W. Biederman" <ebiederm@xmission.com>
parent b3a9e3b9
......@@ -25,7 +25,6 @@ struct subprocess_info {
struct file *file;
int wait;
int retval;
pid_t pid;
int (*init)(struct subprocess_info *info, struct cred *new);
void (*cleanup)(struct subprocess_info *info);
void *data;
......
......@@ -102,7 +102,6 @@ static int call_usermodehelper_exec_async(void *data)
commit_creds(new);
sub_info->pid = task_pid_nr(current);
if (sub_info->file) {
retval = do_execve_file(sub_info->file,
sub_info->argv, sub_info->envp);
......@@ -468,6 +467,7 @@ static int umh_pipe_setup(struct subprocess_info *info, struct cred *new)
umh_info->pipe_to_umh = to_umh[1];
umh_info->pipe_from_umh = from_umh[0];
umh_info->pid = task_pid_nr(current);
return 0;
}
......@@ -476,13 +476,12 @@ static void umh_clean_and_save_pid(struct subprocess_info *info)
struct umh_info *umh_info = info->data;
/* cleanup if umh_pipe_setup() was successful but exec failed */
if (info->pid && info->retval) {
if (info->retval) {
fput(umh_info->pipe_to_umh);
fput(umh_info->pipe_from_umh);
}
argv_free(info->argv);
umh_info->pid = info->pid;
}
/**
......
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