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param: fix charp parameters set via sysfs

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Impact: fix crash on reading from /sys/module/.../ieee80211_default_rc_algo

The module_param type "charp" simply sets a char * pointer in the
module to the parameter in the commandline string: this is why we keep
the (mangled) module command line around.  But when set via sysfs (as
about 11 charp parameters can be) this memory is freed on the way
out of the write().  Future reads hit random mem.

So we kstrdup instead: we have to check we're not in early commandline
parsing, and we have to note when we've used it so we can reliably
kfree the parameter when it's next overwritten, and also on module
unload.

(Thanks to Randy Dunlap for CONFIG_SYSFS=n fixes)

Reported-by: Sitsofe Wheeler <sitsofe@yahoo.com>
Diagnosed-by: Frederic Weisbecker <fweisbec@gmail.com>
Tested-by: Frederic Weisbecker <fweisbec@gmail.com>
Tested-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2009-03-31 13:05:29 -06:00
parent 15f7176eb1
commit e180a6b775
4 changed files with 47 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
include/linux/module.h
View file

@ -248,6 +248,10 @@ struct module
const unsigned long *crcs;
unsigned int num_syms;
/* Kernel parameters. */
struct kernel_param *kp;
unsigned int num_kp;
/* GPL-only exported symbols. */
unsigned int num_gpl_syms;
const struct kernel_symbol *gpl_syms;

10
include/linux/moduleparam.h
View file

@ -138,6 +138,16 @@ extern int parse_args(const char *name,
unsigned num,
int (*unknown)(char *param, char *val));
/* Called by module remove. */
#ifdef CONFIG_SYSFS
extern void destroy_params(const struct kernel_param *params, unsigned num);
#else
static inline void destroy_params(const struct kernel_param *params,
unsigned num)
{
}
#endif /* !CONFIG_SYSFS */
/* All the helper functions */
/* The macros to do compile-time type checking stolen from Jakub
Jelinek, who IIRC came up with this idea for the 2.4 module init code. */

14
kernel/module.c
View file

@ -1491,6 +1491,9 @@ static void free_module(struct module *mod)
/* Module unload stuff */
module_unload_free(mod);
/* Free any allocated parameters. */
destroy_params(mod->kp, mod->num_kp);
/* release any pointers to mcount in this module */
ftrace_release(mod->module_core, mod->core_size);
@ -1898,8 +1901,7 @@ static noinline struct module *load_module(void __user *umod,
unsigned int symindex = 0;
unsigned int strindex = 0;
unsigned int modindex, versindex, infoindex, pcpuindex;
unsigned int num_kp, num_mcount;
struct kernel_param *kp;
unsigned int num_mcount;
struct module *mod;
long err = 0;
void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
@ -2144,8 +2146,8 @@ static noinline struct module *load_module(void __user *umod,
/* Now we've got everything in the final locations, we can
* find optional sections. */
kp = section_objs(hdr, sechdrs, secstrings, "__param", sizeof(*kp),
&num_kp);
mod->kp = section_objs(hdr, sechdrs, secstrings, "__param",
sizeof(*mod->kp), &mod->num_kp);
mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab",
sizeof(*mod->syms), &mod->num_syms);
mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab");
@ -2291,11 +2293,11 @@ static noinline struct module *load_module(void __user *umod,
*/
list_add_rcu(&mod->list, &modules);
err = parse_args(mod->name, mod->args, kp, num_kp, NULL);
err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL);
if (err < 0)
goto unlink;
err = mod_sysfs_setup(mod, kp, num_kp);
err = mod_sysfs_setup(mod, mod->kp, mod->num_kp);
if (err < 0)
goto unlink;
add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);

26
kernel/params.c
View file

@ -24,6 +24,9 @@
#include <linux/err.h>
#include <linux/slab.h>
/* We abuse the high bits of "perm" to record whether we kmalloc'ed. */
#define KPARAM_KMALLOCED 0x80000000
#if 0
#define DEBUGP printk
#else
@ -217,7 +220,19 @@ int param_set_charp(const char *val, struct kernel_param *kp)
return -ENOSPC;
}
*(char **)kp->arg = (char *)val;
if (kp->perm & KPARAM_KMALLOCED)
kfree(*(char **)kp->arg);
/* This is a hack. We can't need to strdup in early boot, and we
* don't need to; this mangled commandline is preserved. */
if (slab_is_available()) {
kp->perm |= KPARAM_KMALLOCED;
*(char **)kp->arg = kstrdup(val, GFP_KERNEL);
if (!kp->arg)
return -ENOMEM;
} else
*(const char **)kp->arg = val;
return 0;
}
@ -571,6 +586,15 @@ void module_param_sysfs_remove(struct module *mod)
}
#endif
void destroy_params(const struct kernel_param *params, unsigned num)
{
unsigned int i;
for (i = 0; i < num; i++)
if (params[i].perm & KPARAM_KMALLOCED)
kfree(*(char **)params[i].arg);
}
static void __init kernel_add_sysfs_param(const char *name,
struct kernel_param *kparam,
unsigned int name_skip)