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Make static usermode helper binaries constant
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There are a number of usermode helper binaries that are "hard coded" in
the kernel today, so mark them as "const" to make it harder for someone
to change where the variables point to.

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Thomas Sailer <t.sailer@alumni.ethz.ch>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Johan Hovold <johan@kernel.org>
Cc: Alex Elder <elder@kernel.org>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Jeff Layton <jlayton@poochiereds.net>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Greg Kroah-Hartman committed Jan 19, 2017
1 parent 6d2c5d6 commit 377e7a2
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Showing 7 changed files with 26 additions and 18 deletions.
4 changes: 2 additions & 2 deletions drivers/macintosh/windfarm_core.c
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Expand Up @@ -74,8 +74,8 @@ static inline void wf_notify(int event, void *param)

static int wf_critical_overtemp(void)
{
static char * critical_overtemp_path = "/sbin/critical_overtemp";
char *argv[] = { critical_overtemp_path, NULL };
static char const critical_overtemp_path[] = "/sbin/critical_overtemp";
char *argv[] = { (char *)critical_overtemp_path, NULL };
static char *envp[] = { "HOME=/",
"TERM=linux",
"PATH=/sbin:/usr/sbin:/bin:/usr/bin",
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10 changes: 7 additions & 3 deletions drivers/net/hamradio/baycom_epp.c
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Expand Up @@ -299,7 +299,7 @@ static inline void baycom_int_freq(struct baycom_state *bc)
* eppconfig_path should be setable via /proc/sys.
*/

static char eppconfig_path[256] = "/usr/sbin/eppfpga";
static char const eppconfig_path[] = "/usr/sbin/eppfpga";

static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/usr/bin:/bin", NULL };

Expand All @@ -308,8 +308,12 @@ static int eppconfig(struct baycom_state *bc)
{
char modearg[256];
char portarg[16];
char *argv[] = { eppconfig_path, "-s", "-p", portarg, "-m", modearg,
NULL };
char *argv[] = {
(char *)eppconfig_path,
"-s",
"-p", portarg,
"-m", modearg,
NULL };

/* set up arguments */
sprintf(modearg, "%sclk,%smodem,fclk=%d,bps=%d,divider=%d%s,extstat",
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5 changes: 3 additions & 2 deletions drivers/pnp/pnpbios/core.c
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Expand Up @@ -98,6 +98,7 @@ static struct completion unload_sem;
*/
static int pnp_dock_event(int dock, struct pnp_docking_station_info *info)
{
static char const sbin_pnpbios[] = "/sbin/pnpbios";
char *argv[3], **envp, *buf, *scratch;
int i = 0, value;

Expand All @@ -112,7 +113,7 @@ static int pnp_dock_event(int dock, struct pnp_docking_station_info *info)
* integrated into the driver core and use the usual infrastructure
* like sysfs and uevents
*/
argv[0] = "/sbin/pnpbios";
argv[0] = (char *)sbin_pnpbios;
argv[1] = "dock";
argv[2] = NULL;

Expand All @@ -139,7 +140,7 @@ static int pnp_dock_event(int dock, struct pnp_docking_station_info *info)
info->location_id, info->serial, info->capabilities);
envp[i] = NULL;

value = call_usermodehelper(argv [0], argv, envp, UMH_WAIT_EXEC);
value = call_usermodehelper(sbin_pnpbios, argv, envp, UMH_WAIT_EXEC);
kfree(buf);
kfree(envp);
return 0;
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4 changes: 2 additions & 2 deletions drivers/staging/greybus/svc_watchdog.c
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Expand Up @@ -44,14 +44,14 @@ static int svc_watchdog_pm_notifier(struct notifier_block *notifier,

static void greybus_reset(struct work_struct *work)
{
static char start_path[256] = "/system/bin/start";
static char const start_path[] = "/system/bin/start";
static char *envp[] = {
"HOME=/",
"PATH=/sbin:/vendor/bin:/system/sbin:/system/bin:/system/xbin",
NULL,
};
static char *argv[] = {
start_path,
(char *)start_path,
"unipro_reset",
NULL,
};
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8 changes: 4 additions & 4 deletions drivers/staging/rtl8192e/rtl8192e/rtl_dm.c
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Expand Up @@ -268,8 +268,8 @@ void rtl92e_dm_watchdog(struct net_device *dev)
static void _rtl92e_dm_check_ac_dc_power(struct net_device *dev)
{
struct r8192_priv *priv = rtllib_priv(dev);
static char *ac_dc_script = "/etc/acpi/wireless-rtl-ac-dc-power.sh";
char *argv[] = {ac_dc_script, DRV_NAME, NULL};
static char const ac_dc_script[] = "/etc/acpi/wireless-rtl-ac-dc-power.sh";
char *argv[] = {(char *)ac_dc_script, DRV_NAME, NULL};
static char *envp[] = {"HOME=/",
"TERM=linux",
"PATH=/usr/bin:/bin",
Expand Down Expand Up @@ -1823,7 +1823,7 @@ static void _rtl92e_dm_check_rf_ctrl_gpio(void *data)
enum rt_rf_power_state eRfPowerStateToSet;
bool bActuallySet = false;
char *argv[3];
static char *RadioPowerPath = "/etc/acpi/events/RadioPower.sh";
static char const RadioPowerPath[] = "/etc/acpi/events/RadioPower.sh";
static char *envp[] = {"HOME=/", "TERM=linux", "PATH=/usr/bin:/bin",
NULL};

Expand Down Expand Up @@ -1862,7 +1862,7 @@ static void _rtl92e_dm_check_rf_ctrl_gpio(void *data)
else
argv[1] = "RFON";

argv[0] = RadioPowerPath;
argv[0] = (char *)RadioPowerPath;
argv[2] = NULL;
call_usermodehelper(RadioPowerPath, argv, envp, UMH_WAIT_PROC);
}
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6 changes: 4 additions & 2 deletions fs/nfsd/nfs4layouts.c
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Original file line number Diff line number Diff line change
Expand Up @@ -613,6 +613,7 @@ nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls)
{
struct nfs4_client *clp = ls->ls_stid.sc_client;
char addr_str[INET6_ADDRSTRLEN];
static char const nfsd_recall_failed[] = "/sbin/nfsd-recall-failed";
static char *envp[] = {
"HOME=/",
"TERM=linux",
Expand All @@ -628,12 +629,13 @@ nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls)
"nfsd: client %s failed to respond to layout recall. "
" Fencing..\n", addr_str);

argv[0] = "/sbin/nfsd-recall-failed";
argv[0] = (char *)nfsd_recall_failed;
argv[1] = addr_str;
argv[2] = ls->ls_file->f_path.mnt->mnt_sb->s_id;
argv[3] = NULL;

error = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
error = call_usermodehelper(nfsd_recall_failed, argv, envp,
UMH_WAIT_PROC);
if (error) {
printk(KERN_ERR "nfsd: fence failed for client %s: %d!\n",
addr_str, error);
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7 changes: 4 additions & 3 deletions security/keys/request_key.c
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Original file line number Diff line number Diff line change
Expand Up @@ -72,7 +72,7 @@ static void umh_keys_cleanup(struct subprocess_info *info)
/*
* Call a usermode helper with a specific session keyring.
*/
static int call_usermodehelper_keys(char *path, char **argv, char **envp,
static int call_usermodehelper_keys(const char *path, char **argv, char **envp,
struct key *session_keyring, int wait)
{
struct subprocess_info *info;
Expand All @@ -95,6 +95,7 @@ static int call_sbin_request_key(struct key_construction *cons,
const char *op,
void *aux)
{
static char const request_key[] = "/sbin/request-key";
const struct cred *cred = current_cred();
key_serial_t prkey, sskey;
struct key *key = cons->key, *authkey = cons->authkey, *keyring,
Expand Down Expand Up @@ -161,7 +162,7 @@ static int call_sbin_request_key(struct key_construction *cons,

/* set up the argument list */
i = 0;
argv[i++] = "/sbin/request-key";
argv[i++] = (char *)request_key;
argv[i++] = (char *) op;
argv[i++] = key_str;
argv[i++] = uid_str;
Expand All @@ -172,7 +173,7 @@ static int call_sbin_request_key(struct key_construction *cons,
argv[i] = NULL;

/* do it */
ret = call_usermodehelper_keys(argv[0], argv, envp, keyring,
ret = call_usermodehelper_keys(request_key, argv, envp, keyring,
UMH_WAIT_PROC);
kdebug("usermode -> 0x%x", ret);
if (ret >= 0) {
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