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authorLinus Torvalds <torvalds@linux-foundation.org>2011-10-26 14:39:47 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2011-10-26 14:39:47 +0200
commit2355e4290336fcda4b4a799448f745155a000226 (patch)
tree81814353573f5a47ac8f96d75221cfee46a0f92c
parente33bae14fd8da449d735552d78e6dd33ece0458c (diff)
parentb1e4d20cbf2ef8e27515da032b95fdcbb5b06bf1 (diff)
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()
-rw-r--r--include/linux/moduleparam.h20
-rw-r--r--init/main.c4
-rw-r--r--kernel/kmod.c4
-rw-r--r--kernel/params.c21
4 files changed, 39 insertions, 10 deletions
diff --git a/include/linux/moduleparam.h b/include/linux/moduleparam.h
index ddaae98c53f..fffb10bd551 100644
--- a/include/linux/moduleparam.h
+++ b/include/linux/moduleparam.h
@@ -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,
diff --git a/init/main.c b/init/main.c
index 03b408dff82..63f5f6f8dc3 100644
--- a/init/main.c
+++ b/init/main.c
@@ -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)
) {
diff --git a/kernel/kmod.c b/kernel/kmod.c
index ddc7644c130..a4bea97c75b 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -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;
}
diff --git a/kernel/params.c b/kernel/params.c
index 22df3e0d142..821788947e4 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -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,