From 61598093bbdd283a7edc367d900f223070ead8d2 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 07:43:03 +0000
Subject: [PATCH] add ax88772C AX88772C_eeprom_tools
---
kernel/kernel/umh.c | 156 +++-------------------------------------------------
1 files changed, 9 insertions(+), 147 deletions(-)
diff --git a/kernel/kernel/umh.c b/kernel/kernel/umh.c
index 1665331..3f64661 100644
--- a/kernel/kernel/umh.c
+++ b/kernel/kernel/umh.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* umh - the kernel usermode helper
*/
@@ -26,8 +27,6 @@
#include <linux/ptrace.h>
#include <linux/async.h>
#include <linux/uaccess.h>
-#include <linux/shmem_fs.h>
-#include <linux/pipe_fs_i.h>
#include <trace/events/module.h>
@@ -108,14 +107,9 @@
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);
- else
- retval = do_execve(getname_kernel(sub_info->path),
- (const char __user *const __user *)sub_info->argv,
- (const char __user *const __user *)sub_info->envp);
+ retval = kernel_execve(sub_info->path,
+ (const char *const *)sub_info->argv,
+ (const char *const *)sub_info->envp);
out:
sub_info->retval = retval;
/*
@@ -134,37 +128,16 @@
{
pid_t pid;
- /* If SIGCLD is ignored kernel_wait4 won't populate the status. */
+ /* If SIGCLD is ignored do_wait won't populate the status. */
kernel_sigaction(SIGCHLD, SIG_DFL);
pid = kernel_thread(call_usermodehelper_exec_async, sub_info, SIGCHLD);
- if (pid < 0) {
+ if (pid < 0)
sub_info->retval = pid;
- } else {
- int ret = -ECHILD;
- /*
- * Normally it is bogus to call wait4() from in-kernel because
- * wait4() wants to write the exit code to a userspace address.
- * But call_usermodehelper_exec_sync() always runs as kernel
- * thread (workqueue) and put_user() to a kernel address works
- * OK for kernel threads, due to their having an mm_segment_t
- * which spans the entire address space.
- *
- * Thus the __user pointer cast is valid here.
- */
- kernel_wait4(pid, (int __user *)&ret, 0, NULL);
-
- /*
- * If ret is 0, either call_usermodehelper_exec_async failed and
- * the real error code is already in sub_info->retval or
- * sub_info->retval is 0 anyway, so don't mess with it then.
- */
- if (ret)
- sub_info->retval = ret;
- }
+ else
+ kernel_wait(pid, &sub_info->retval);
/* Restore default kernel sig handler */
kernel_sigaction(SIGCHLD, SIG_IGN);
-
umh_complete(sub_info);
}
@@ -409,117 +382,6 @@
}
EXPORT_SYMBOL(call_usermodehelper_setup);
-struct subprocess_info *call_usermodehelper_setup_file(struct file *file,
- int (*init)(struct subprocess_info *info, struct cred *new),
- void (*cleanup)(struct subprocess_info *info), void *data)
-{
- struct subprocess_info *sub_info;
-
- sub_info = kzalloc(sizeof(struct subprocess_info), GFP_KERNEL);
- if (!sub_info)
- return NULL;
-
- INIT_WORK(&sub_info->work, call_usermodehelper_exec_work);
- sub_info->path = "none";
- sub_info->file = file;
- sub_info->init = init;
- sub_info->cleanup = cleanup;
- sub_info->data = data;
- return sub_info;
-}
-
-static int umh_pipe_setup(struct subprocess_info *info, struct cred *new)
-{
- struct umh_info *umh_info = info->data;
- struct file *from_umh[2];
- struct file *to_umh[2];
- int err;
-
- /* create pipe to send data to umh */
- err = create_pipe_files(to_umh, 0);
- if (err)
- return err;
- err = replace_fd(0, to_umh[0], 0);
- fput(to_umh[0]);
- if (err < 0) {
- fput(to_umh[1]);
- return err;
- }
-
- /* create pipe to receive data from umh */
- err = create_pipe_files(from_umh, 0);
- if (err) {
- fput(to_umh[1]);
- replace_fd(0, NULL, 0);
- return err;
- }
- err = replace_fd(1, from_umh[1], 0);
- fput(from_umh[1]);
- if (err < 0) {
- fput(to_umh[1]);
- replace_fd(0, NULL, 0);
- fput(from_umh[0]);
- return err;
- }
-
- umh_info->pipe_to_umh = to_umh[1];
- umh_info->pipe_from_umh = from_umh[0];
- return 0;
-}
-
-static void umh_save_pid(struct subprocess_info *info)
-{
- struct umh_info *umh_info = info->data;
-
- umh_info->pid = info->pid;
-}
-
-/**
- * fork_usermode_blob - fork a blob of bytes as a usermode process
- * @data: a blob of bytes that can be do_execv-ed as a file
- * @len: length of the blob
- * @info: information about usermode process (shouldn't be NULL)
- *
- * Returns either negative error or zero which indicates success
- * in executing a blob of bytes as a usermode process. In such
- * case 'struct umh_info *info' is populated with two pipes
- * and a pid of the process. The caller is responsible for health
- * check of the user process, killing it via pid, and closing the
- * pipes when user process is no longer needed.
- */
-int fork_usermode_blob(void *data, size_t len, struct umh_info *info)
-{
- struct subprocess_info *sub_info;
- struct file *file;
- ssize_t written;
- loff_t pos = 0;
- int err;
-
- file = shmem_kernel_file_setup("", len, 0);
- if (IS_ERR(file))
- return PTR_ERR(file);
-
- written = kernel_write(file, data, len, &pos);
- if (written != len) {
- err = written;
- if (err >= 0)
- err = -ENOMEM;
- goto out;
- }
-
- err = -ENOMEM;
- sub_info = call_usermodehelper_setup_file(file, umh_pipe_setup,
- umh_save_pid, info);
- if (!sub_info)
- goto out;
-
- err = call_usermodehelper_exec(sub_info, UMH_WAIT_EXEC);
-out:
- fput(file);
- return err;
-}
-EXPORT_SYMBOL_GPL(fork_usermode_blob);
-
/**
* call_usermodehelper_exec - start a usermode application
* @sub_info: information about the subprocessa
@@ -622,7 +484,7 @@
EXPORT_SYMBOL(call_usermodehelper);
static int proc_cap_handler(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
+ void *buffer, size_t *lenp, loff_t *ppos)
{
struct ctl_table t;
unsigned long cap_array[_KERNEL_CAPABILITY_U32S];
--
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