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Merge tag 'driver-core-4.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

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Pull driver core updates from Greg KH:
 "Here is the "small" driver core patches for 4.11-rc1.

  Not much here, some firmware documentation and self-test updates, a
  debugfs code formatting issue, and a new feature for call_usermodehelper
  to make it more robust on systems that want to lock it down in a more
  secure way.

  All of these have been linux-next for a while now with no reported
  issues"

* tag 'driver-core-4.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  kernfs: handle null pointers while printing node name and path
  Introduce STATIC_USERMODEHELPER to mediate call_usermodehelper()
  Make static usermode helper binaries constant
  kmod: make usermodehelper path a const string
  firmware: revamp firmware documentation
  selftests: firmware: send expected errors to /dev/null
  selftests: firmware: only modprobe if driver is missing
  platform: Print the resource range if device failed to claim
  kref: prefer atomic_inc_not_zero to atomic_add_unless
  debugfs: improve formatting of debugfs_real_fops()
This commit is contained in:
Linus Torvalds
2017-02-22 11:44:32 -08:00
parent e30aee9e10 17627157cd
commit b2064617c7
27 changed files with 593 additions and 173 deletions
Download Patch File Download Diff File Expand all files Collapse all files
kernel/kmod.c
+16 -2
View File
@@ -516,7 +516,7 @@ static void helper_unlock(void)
* Function must be runnable in either a process context or the
* context in which call_usermodehelper_exec is called.
*/
struct subprocess_info *call_usermodehelper_setup(char *path, char **argv,
struct subprocess_info *call_usermodehelper_setup(const char *path, char **argv,
char **envp, gfp_t gfp_mask,
int (*init)(struct subprocess_info *info, struct cred *new),
void (*cleanup)(struct subprocess_info *info),
@@ -528,7 +528,12 @@ struct subprocess_info *call_usermodehelper_setup(char *path, char **argv,
goto out;
INIT_WORK(&sub_info->work, call_usermodehelper_exec_work);
#ifdef CONFIG_STATIC_USERMODEHELPER
sub_info->path = CONFIG_STATIC_USERMODEHELPER_PATH;
#else
sub_info->path = path;
#endif
sub_info->argv = argv;
sub_info->envp = envp;
@@ -566,6 +571,15 @@ int call_usermodehelper_exec(struct subprocess_info *sub_info, int wait)
retval = -EBUSY;
goto out;
}
/*
* If there is no binary for us to call, then just return and get out of
* here. This allows us to set STATIC_USERMODEHELPER_PATH to "" and
* disable all call_usermodehelper() calls.
*/
if (strlen(sub_info->path) == 0)
goto out;
/*
* Set the completion pointer only if there is a waiter.
* This makes it possible to use umh_complete to free
@@ -613,7 +627,7 @@ EXPORT_SYMBOL(call_usermodehelper_exec);
* This function is the equivalent to use call_usermodehelper_setup() and
* call_usermodehelper_exec().
*/
int call_usermodehelper(char *path, char **argv, char **envp, int wait)
int call_usermodehelper(const char *path, char **argv, char **envp, int wait)
{
struct subprocess_info *info;
gfp_t gfp_mask = (wait == UMH_NO_WAIT) ? GFP_ATOMIC : GFP_KERNEL;