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[PATCH] null-terminate over-long /proc/kallsyms symbols

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Got a customer bug report (https://bugzilla.novell.com/190296) about kernel
symbols longer than 127 characters which end up in a string buffer that is
not NULL terminated, leading to garbage in /proc/kallsyms.  Using strlcpy
prevents this from happening, even though such symbols still won't come out
right.

A better fix would be to not use a fixed-size buffer, but it's probably not
worth the trouble.  (Modversion'ed symbols even have a length limit of 60.)

[bunk@stusta.de: build fix]
Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andreas Gruenbacher 2006-07-14 00:24:04 -07:00 committed by Linus Torvalds
parent 329c6e4257
commit 098c5eea03
3 changed files with 10 additions and 15 deletions
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10
include/linux/module.h
View file

@ -362,10 +362,8 @@ int is_module_address(unsigned long addr);
/* Returns module and fills in value, defined and namebuf, or NULL if
symnum out of range. */
struct module *module_get_kallsym(unsigned int symnum,
unsigned long *value,
char *type,
char namebuf[128]);
struct module *module_get_kallsym(unsigned int symnum, unsigned long *value,
char *type, char *name, size_t namelen);
/* Look for this name: can be of form module:name. */
unsigned long module_kallsyms_lookup_name(const char *name);
@ -535,8 +533,8 @@ static inline const char *module_address_lookup(unsigned long addr,
static inline struct module *module_get_kallsym(unsigned int symnum,
unsigned long *value,
char *type,
char namebuf[128])
char *type, char *name,
size_t namelen)
{
return NULL;
}

4
kernel/kallsyms.c
View file

@ -275,8 +275,8 @@ static void upcase_if_global(struct kallsym_iter *iter)
static int get_ksymbol_mod(struct kallsym_iter *iter)
{
iter->owner = module_get_kallsym(iter->pos - kallsyms_num_syms,
&iter->value,
&iter->type, iter->name);
&iter->value, &iter->type,
iter->name, sizeof(iter->name));
if (iter->owner == NULL)
return 0;

11
kernel/module.c
View file

@ -2019,10 +2019,8 @@ const char *module_address_lookup(unsigned long addr,
return NULL;
}
struct module *module_get_kallsym(unsigned int symnum,
unsigned long *value,
char *type,
char namebuf[128])
struct module *module_get_kallsym(unsigned int symnum, unsigned long *value,
char *type, char *name, size_t namelen)
{
struct module *mod;
@ -2031,9 +2029,8 @@ struct module *module_get_kallsym(unsigned int symnum,
if (symnum < mod->num_symtab) {
*value = mod->symtab[symnum].st_value;
*type = mod->symtab[symnum].st_info;
strncpy(namebuf,
mod->strtab + mod->symtab[symnum].st_name,
127);
strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
namelen);
mutex_unlock(&module_mutex);
return mod;
}