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kernel/params.c: generalize bool_enable_only

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This takes out the bool_enable_only implementation from
the module loading code and generalizes it so that others
can make use of it.

Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: linux-kernel@vger.kernel.org
Cc: cocci@systeme.lip6.fr
Signed-off-by: Luis R. Rodriguez <mcgrof@suse.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Luis R. Rodriguez 2015-05-27 11:09:38 +09:30 committed by Rusty Russell
parent 05f408dddb
commit d19f05d8a8
3 changed files with 36 additions and 31 deletions
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6
include/linux/moduleparam.h
View File

@ -427,6 +427,12 @@ extern int param_set_bool(const char *val, const struct kernel_param *kp);
extern int param_get_bool(char *buffer, const struct kernel_param *kp);
#define param_check_bool(name, p) __param_check(name, p, bool)
extern const struct kernel_param_ops param_ops_bool_enable_only;
extern int param_set_bool_enable_only(const char *val,
const struct kernel_param *kp);
/* getter is the same as for the regular bool */
#define param_check_bool_enable_only param_check_bool
extern const struct kernel_param_ops param_ops_invbool;
extern int param_set_invbool(const char *val, const struct kernel_param *kp);
extern int param_get_invbool(char *buffer, const struct kernel_param *kp);

31
kernel/module.c
View File

@ -298,37 +298,6 @@ static bool sig_enforce = true;
#else
static bool sig_enforce = false;
static int param_set_bool_enable_only(const char *val,
const struct kernel_param *kp)
{
int err = 0;
bool new_value;
bool orig_value = *(bool *)kp->arg;
struct kernel_param dummy_kp = *kp;
dummy_kp.arg = &new_value;
err = param_set_bool(val, &dummy_kp);
if (err)
return err;
/* Don't let them unset it once it's set! */
if (!new_value && orig_value)
return -EROFS;
if (new_value)
err = param_set_bool(val, kp);
return err;
}
static const struct kernel_param_ops param_ops_bool_enable_only = {
.flags = KERNEL_PARAM_OPS_FL_NOARG,
.set = param_set_bool_enable_only,
.get = param_get_bool,
};
#define param_check_bool_enable_only param_check_bool
module_param(sig_enforce, bool_enable_only, 0644);
#endif /* !CONFIG_MODULE_SIG_FORCE */
#endif /* CONFIG_MODULE_SIG */

30
kernel/params.c
View File

@ -335,6 +335,36 @@ const struct kernel_param_ops param_ops_bool = {
};
EXPORT_SYMBOL(param_ops_bool);
int param_set_bool_enable_only(const char *val, const struct kernel_param *kp)
{
int err = 0;
bool new_value;
bool orig_value = *(bool *)kp->arg;
struct kernel_param dummy_kp = *kp;
dummy_kp.arg = &new_value;
err = param_set_bool(val, &dummy_kp);
if (err)
return err;
/* Don't let them unset it once it's set! */
if (!new_value && orig_value)
return -EROFS;
if (new_value)
err = param_set_bool(val, kp);
return err;
}
EXPORT_SYMBOL_GPL(param_set_bool_enable_only);
const struct kernel_param_ops param_ops_bool_enable_only = {
.flags = KERNEL_PARAM_OPS_FL_NOARG,
.set = param_set_bool_enable_only,
.get = param_get_bool,
};
/* This one must be bool. */
int param_set_invbool(const char *val, const struct kernel_param *kp)
{