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kernel/module.c: use scnprintf() instead of sprintf()

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For some strings, they are permitted to be larger than PAGE_SIZE, so
need use scnprintf() instead of sprintf(), or it will cause issue.

One case is:

  if a module version is crazy defined (length more than PAGE_SIZE),
  'modinfo' command is still OK (print full contents),
  but for "cat /sys/modules/'modname'/version", will cause issue in kernel.

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Chen Gang
2013-08-20 15:34:21 +09:30
committed by Rusty Russell
parent 5265fc6219
commit cc56ded3fd
1 changed files with 1 additions and 1 deletions
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kernel/module.c
+1 -1
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@@ -604,7 +604,7 @@ static void setup_modinfo_##field(struct module *mod, const char *s) \
static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
struct module_kobject *mk, char *buffer) \
{ \
return sprintf(buffer, "%s\n", mk->mod->field); \
return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \
} \
static int modinfo_##field##_exists(struct module *mod) \
{ \