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

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* git://github.com/rustyrussell/linux:
  params: make dashes and underscores in parameter names truly equal
  kmod: prevent kmod_loop_msg overflow in __request_module()
This commit is contained in:
Linus Torvalds 2011-10-26 14:39:47 +02:00
commit 2355e42903
4 changed files with 39 additions and 10 deletions
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20
include/linux/moduleparam.h
View File

@ -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,

4
init/main.c
View File

@ -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)
) {

4
kernel/kmod.c
View File

@ -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;
}

21
kernel/params.c
View File

@ -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,