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Commit 2355e429 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge git://github.com/rustyrussell/linux 

* git://github.com/rustyrussell/linux:
  params: make dashes and underscores in parameter names truly equal
  kmod: prevent kmod_loop_msg overflow in __request_module()
parents e33bae14 b1e4d20c

include/linux/moduleparam.h

+20 −0
Original line number Diff line number Diff line
@@ -262,6 +262,26 @@ static inline void __kernel_param_unlock(void) 
			    .str = &__param_string_##name, 0, perm);	\

	__MODULE_PARM_TYPE(name, "string")



/**

 * parameq - checks if two parameter names match

 * @name1: parameter name 1

 * @name2: parameter name 2

 *

 * Returns true if the two parameter names are equal.

 * Dashes (-) are considered equal to underscores (_).

 */

extern bool parameq(const char *name1, const char *name2);



/**

 * parameqn - checks if two parameter names match

 * @name1: parameter name 1

 * @name2: parameter name 2

 * @n: the length to compare

 *

 * Similar to parameq(), except it compares @n characters.

 */

extern bool parameqn(const char *name1, const char *name2, size_t n);



/* Called on module insert or kernel boot */

extern int parse_args(const char *name,

		      char *args,

init/main.c

+2 −2
Original line number Diff line number Diff line
@@ -163,7 +163,7 @@ static int __init obsolete_checksetup(char *line) 
	p = __setup_start;

	do {

		int n = strlen(p->str);

		if (!strncmp(line, p->str, n)) {

		if (parameqn(line, p->str, n)) {

			if (p->early) {

				/* Already done in parse_early_param?

				 * (Needs exact match on param part).
@@ -392,7 +392,7 @@ static int __init do_early_param(char *param, char *val) 
	const struct obs_kernel_param *p;



	for (p = __setup_start; p < __setup_end; p++) {

		if ((p->early && strcmp(param, p->str) == 0) ||

		if ((p->early && parameq(param, p->str)) ||

		    (strcmp(param, "console") == 0 &&

		     strcmp(p->str, "earlycon") == 0)

		) {

kernel/kmod.c

+3 −1
Original line number Diff line number Diff line
@@ -114,10 +114,12 @@ int __request_module(bool wait, const char *fmt, ...) 
	atomic_inc(&kmod_concurrent);

	if (atomic_read(&kmod_concurrent) > max_modprobes) {

		/* We may be blaming an innocent here, but unlikely */

		if (kmod_loop_msg++ < 5)

		if (kmod_loop_msg < 5) {

			printk(KERN_ERR

			       "request_module: runaway loop modprobe %s\n",

			       module_name);

			kmod_loop_msg++;

		}

		atomic_dec(&kmod_concurrent);

		return -ENOMEM;

	}

kernel/params.c

+14 −7
Original line number Diff line number Diff line
@@ -67,20 +67,27 @@ static void maybe_kfree_parameter(void *param) 
	}

}



static inline char dash2underscore(char c)

static char dash2underscore(char c)

{

	if (c == '-')

		return '_';

	return c;

}



static inline int parameq(const char *input, const char *paramname)

bool parameqn(const char *a, const char *b, size_t n)

{

	unsigned int i;

	for (i = 0; dash2underscore(input[i]) == paramname[i]; i++)

		if (input[i] == '\0')

			return 1;

	return 0;

	size_t i;



	for (i = 0; i < n; i++) {

		if (dash2underscore(a[i]) != dash2underscore(b[i]))

			return false;

	}

	return true;

}



bool parameq(const char *a, const char *b)

{

	return parameqn(a, b, strlen(a)+1);

}



static int parse_one(char *param,