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Merge remote-tracking branch 'sm8350/lineage-20' into lineage-23.0

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* sm8350/lineage-20: (841 commits)
  UPSTREAM: fs: prevent out-of-bounds array speculation when closing a file descriptor
  UPSTREAM: file: let pick_file() tell caller it's done
  BACKPORT: rcu-tasks: Add a grace-period start time for throttling and debug
  BACKPORT: maccess: rename probe_user_{read,write} to copy_{from,to}_user_nofault
  BACKPORT: powerpc: use probe_user_read() and probe_user_write()
  BACKPORT: maccess: rename probe_kernel_address to get_kernel_nofault
  BACKPORT: tracing/kprobes: handle mixed kernel/userspace probes better
  BACKPORT: maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault
  UPSTREAM: maccess: unexport probe_kernel_write()
  UPSTREAM: maccess: return -ERANGE when probe_kernel_read() fails
  UPSTREAM: maccess: allow architectures to provide kernel probing directly
  BACKPORT: maccess: remove strncpy_from_unsafe
  UPSTREAM: bpf:bpf_seq_printf(): handle potentially unsafe format string better
  UPSTREAM: bpf: Use strncpy_from_unsafe_strict() in bpf_seq_printf() helper
  UPSTREAM: bpf: handle the compat string in bpf_trace_copy_string better
  UPSTREAM: bpf: factor out a bpf_trace_copy_string helper
  BACKPORT: maccess: always use strict semantics for probe_kernel_read
  UPSTREAM: maccess: unify the probe kernel arch hooks
  UPSTREAM: maccess: remove probe_read_common and probe_write_common
  UPSTREAM: maccess: remove duplicate kerneldoc comments
  ...

Change-Id: I22cf7d6fb34826727904effb4f012b0ef459149d
This commit is contained in:
Michael Bestas 2026-01-20 20:47:39 +02:00
commit 2eb0f824a1
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529 changed files with 40893 additions and 9494 deletions
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167
kernel/umh.c
View file

@ -27,8 +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>
@ -39,8 +37,6 @@ static kernel_cap_t usermodehelper_bset = CAP_FULL_SET;
static kernel_cap_t usermodehelper_inheritable = CAP_FULL_SET;
static DEFINE_SPINLOCK(umh_sysctl_lock);
static DECLARE_RWSEM(umhelper_sem);
static LIST_HEAD(umh_list);
static DEFINE_MUTEX(umh_list_lock);
static void call_usermodehelper_freeinfo(struct subprocess_info *info)
{
@ -111,13 +107,10 @@ static int call_usermodehelper_exec_async(void *data)
commit_creds(new);
sub_info->pid = task_pid_nr(current);
if (sub_info->file) {
if (sub_info->file)
retval = do_execve_file(sub_info->file,
sub_info->argv, sub_info->envp);
if (!retval)
current->flags |= PF_UMH;
} else
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);
@ -418,140 +411,6 @@ struct subprocess_info *call_usermodehelper_setup(const char *path, char **argv,
}
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;
struct umh_info *info = data;
const char *cmdline = (info->cmdline) ? info->cmdline : "usermodehelper";
sub_info = kzalloc(sizeof(struct subprocess_info), GFP_KERNEL);
if (!sub_info)
return NULL;
sub_info->argv = argv_split(GFP_KERNEL, cmdline, NULL);
if (!sub_info->argv) {
kfree(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_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) {
fput(umh_info->pipe_to_umh);
fput(umh_info->pipe_from_umh);
}
argv_free(info->argv);
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)
*
* If info->cmdline is set it will be used as command line for the
* user process, else "usermodehelper" is used.
*
* 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_clean_and_save_pid, info);
if (!sub_info)
goto out;
err = call_usermodehelper_exec(sub_info, UMH_WAIT_EXEC);
if (!err) {
mutex_lock(&umh_list_lock);
list_add(&info->list, &umh_list);
mutex_unlock(&umh_list_lock);
}
out:
fput(file);
return err;
}
EXPORT_SYMBOL_GPL(fork_usermode_blob);
/**
* call_usermodehelper_exec - start a usermode application
* @sub_info: information about the subprocessa
@ -654,7 +513,7 @@ int call_usermodehelper(const char *path, char **argv, char **envp, int wait)
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];
@ -713,26 +572,6 @@ static int proc_cap_handler(struct ctl_table *table, int write,
return 0;
}
void __exit_umh(struct task_struct *tsk)
{
struct umh_info *info;
pid_t pid = tsk->pid;
mutex_lock(&umh_list_lock);
list_for_each_entry(info, &umh_list, list) {
if (info->pid == pid) {
list_del(&info->list);
mutex_unlock(&umh_list_lock);
goto out;
}
}
mutex_unlock(&umh_list_lock);
return;
out:
if (info->cleanup)
info->cleanup(info);
}
struct ctl_table usermodehelper_table[] = {
{
.procname = "bset",