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kallsyms: make KSYM_NAME_LEN include space for trailing '\0' 

KSYM_NAME_LEN is peculiar in that it does not include the space for the
trailing '\0', forcing all users to use KSYM_NAME_LEN + 1 when allocating
buffer.  This is nonsense and error-prone.  Moreover, when the caller
forgets that it's very likely to subtly bite back by corrupting the stack
because the last position of the buffer is always cleared to zero.

This patch increments KSYM_NAME_LEN by one and updates code accordingly.

* off-by-one bug in asm-powerpc/kprobes.h::kprobe_lookup_name() macro
  is fixed.

* Where MODULE_NAME_LEN and KSYM_NAME_LEN were used together,
  MODULE_NAME_LEN was treated as if it didn't include space for the
  trailing '\0'.  Fix it.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Acked-by: Paulo Marques <pmarques@grupopie.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tejun Heo 2007-07-17 04:03:51 -07:00 committed by Linus Torvalds
parent b45d527974
commit 9281acea6a
11 changed files with 27 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/parisc/kernel/unwind.c
View File

@ -242,7 +242,7 @@ static void unwind_frame_regs(struct unwind_frame_info *info)
#ifdef CONFIG_KALLSYMS
/* Handle some frequent special cases.... */
{
char symname[KSYM_NAME_LEN+1];
char symname[KSYM_NAME_LEN];
char *modname;
kallsyms_lookup(info->ip, NULL, NULL, &modname,

2
fs/proc/base.c
View File

@ -283,7 +283,7 @@ static int proc_pid_auxv(struct task_struct *task, char *buffer)
static int proc_pid_wchan(struct task_struct *task, char *buffer)
{
unsigned long wchan;
char symname[KSYM_NAME_LEN+1];
char symname[KSYM_NAME_LEN];
wchan = get_wchan(task);

4
include/asm-powerpc/kprobes.h
View File

@ -65,10 +65,10 @@ typedef unsigned int kprobe_opcode_t;
} else if (name[0] != '.') \
addr = *(kprobe_opcode_t **)addr; \
} else { \
char dot_name[KSYM_NAME_LEN+1]; \
char dot_name[KSYM_NAME_LEN]; \
dot_name[0] = '.'; \
dot_name[1] = '\0'; \
strncat(dot_name, name, KSYM_NAME_LEN); \
strncat(dot_name, name, KSYM_NAME_LEN - 2); \
addr = (kprobe_opcode_t *)kallsyms_lookup_name(dot_name); \
} \
}

6
include/linux/kallsyms.h
View File

@ -7,9 +7,9 @@
#include <linux/errno.h>
#define KSYM_NAME_LEN 127
#define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s]") + KSYM_NAME_LEN + \
2*(BITS_PER_LONG*3/10) + MODULE_NAME_LEN + 1)
#define KSYM_NAME_LEN 128
#define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s]") + (KSYM_NAME_LEN - 1) + \
2*(BITS_PER_LONG*3/10) + (MODULE_NAME_LEN - 1) + 1)
#ifdef CONFIG_KALLSYMS
/* Lookup the address for a symbol. Returns 0 if not found. */

16
kernel/kallsyms.c
View File

@ -152,7 +152,7 @@ static unsigned int get_symbol_offset(unsigned long pos)
/* Lookup the address for this symbol. Returns 0 if not found. */
unsigned long kallsyms_lookup_name(const char *name)
{
char namebuf[KSYM_NAME_LEN+1];
char namebuf[KSYM_NAME_LEN];
unsigned long i;
unsigned int off;
@ -248,7 +248,7 @@ const char *kallsyms_lookup(unsigned long addr,
{
const char *msym;
namebuf[KSYM_NAME_LEN] = 0;
namebuf[KSYM_NAME_LEN - 1] = 0;
namebuf[0] = 0;
if (is_ksym_addr(addr)) {
@ -265,7 +265,7 @@ const char *kallsyms_lookup(unsigned long addr,
/* see if it's in a module */
msym = module_address_lookup(addr, symbolsize, offset, modname);
if (msym)
return strncpy(namebuf, msym, KSYM_NAME_LEN);
return strncpy(namebuf, msym, KSYM_NAME_LEN - 1);
return NULL;
}
@ -273,7 +273,7 @@ const char *kallsyms_lookup(unsigned long addr,
int lookup_symbol_name(unsigned long addr, char *symname)
{
symname[0] = '\0';
symname[KSYM_NAME_LEN] = '\0';
symname[KSYM_NAME_LEN - 1] = '\0';
if (is_ksym_addr(addr)) {
unsigned long pos;
@ -291,7 +291,7 @@ int lookup_symbol_attrs(unsigned long addr, unsigned long *size,
unsigned long *offset, char *modname, char *name)
{
name[0] = '\0';
name[KSYM_NAME_LEN] = '\0';
name[KSYM_NAME_LEN - 1] = '\0';
if (is_ksym_addr(addr)) {
unsigned long pos;
@ -312,7 +312,7 @@ int sprint_symbol(char *buffer, unsigned long address)
char *modname;
const char *name;
unsigned long offset, size;
char namebuf[KSYM_NAME_LEN+1];
char namebuf[KSYM_NAME_LEN];
name = kallsyms_lookup(address, &size, &offset, &modname, namebuf);
if (!name)
@ -342,8 +342,8 @@ struct kallsym_iter
unsigned long value;
unsigned int nameoff; /* If iterating in core kernel symbols */
char type;
char name[KSYM_NAME_LEN+1];
char module_name[MODULE_NAME_LEN + 1];
char name[KSYM_NAME_LEN];
char module_name[MODULE_NAME_LEN];
int exported;
};

4
kernel/lockdep.c
View File

@ -379,7 +379,7 @@ get_usage_chars(struct lock_class *class, char *c1, char *c2, char *c3, char *c4
static void print_lock_name(struct lock_class *class)
{
char str[KSYM_NAME_LEN + 1], c1, c2, c3, c4;
char str[KSYM_NAME_LEN], c1, c2, c3, c4;
const char *name;
get_usage_chars(class, &c1, &c2, &c3, &c4);
@ -401,7 +401,7 @@ static void print_lock_name(struct lock_class *class)
static void print_lockdep_cache(struct lockdep_map *lock)
{
const char *name;
char str[KSYM_NAME_LEN + 1];
char str[KSYM_NAME_LEN];
name = lock->name;
if (!name)

10
kernel/module.c
View File

@ -2133,7 +2133,7 @@ int lookup_module_symbol_name(unsigned long addr, char *symname)
sym = get_ksymbol(mod, addr, NULL, NULL);
if (!sym)
goto out;
strlcpy(symname, sym, KSYM_NAME_LEN + 1);
strlcpy(symname, sym, KSYM_NAME_LEN);
mutex_unlock(&module_mutex);
return 0;
}
@ -2158,9 +2158,9 @@ int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
if (!sym)
goto out;
if (modname)
strlcpy(modname, mod->name, MODULE_NAME_LEN + 1);
strlcpy(modname, mod->name, MODULE_NAME_LEN);
if (name)
strlcpy(name, sym, KSYM_NAME_LEN + 1);
strlcpy(name, sym, KSYM_NAME_LEN);
mutex_unlock(&module_mutex);
return 0;
}
@ -2181,8 +2181,8 @@ int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
*value = mod->symtab[symnum].st_value;
*type = mod->symtab[symnum].st_info;
strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
KSYM_NAME_LEN + 1);
strlcpy(module_name, mod->name, MODULE_NAME_LEN + 1);
KSYM_NAME_LEN);
strlcpy(module_name, mod->name, MODULE_NAME_LEN);
*exported = is_exported(name, mod);
mutex_unlock(&module_mutex);
return 0;

2
kernel/time/timer_list.c
View File

@ -38,7 +38,7 @@ DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases);
static void print_name_offset(struct seq_file *m, void *sym)
{
char symname[KSYM_NAME_LEN+1];
char symname[KSYM_NAME_LEN];
if (lookup_symbol_name((unsigned long)sym, symname) < 0)
SEQ_printf(m, "<%p>", sym);

2
kernel/time/timer_stats.c
View File

@ -269,7 +269,7 @@ void timer_stats_update_stats(void *timer, pid_t pid, void *startf,
static void print_name_offset(struct seq_file *m, unsigned long addr)
{
char symname[KSYM_NAME_LEN+1];
char symname[KSYM_NAME_LEN];
if (lookup_symbol_name(addr, symname) < 0)
seq_printf(m, "<%p>", (void *)addr);

2
mm/slab.c
View File

@ -4344,7 +4344,7 @@ static void show_symbol(struct seq_file *m, unsigned long address)
{
#ifdef CONFIG_KALLSYMS
unsigned long offset, size;
char modname[MODULE_NAME_LEN + 1], name[KSYM_NAME_LEN + 1];
char modname[MODULE_NAME_LEN], name[KSYM_NAME_LEN];
if (lookup_symbol_attrs(address, &size, &offset, modname, name) == 0) {
seq_printf(m, "%s+%#lx/%#lx", name, offset, size);

4
scripts/kallsyms.c
View File

@ -31,7 +31,7 @@
#include <string.h>
#include <ctype.h>
#define KSYM_NAME_LEN 127
#define KSYM_NAME_LEN 128
struct sym_entry {
@ -254,7 +254,7 @@ static void write_src(void)
unsigned int i, k, off;
unsigned int best_idx[256];
unsigned int *markers;
char buf[KSYM_NAME_LEN+1];
char buf[KSYM_NAME_LEN];
printf("#include <asm/types.h>\n");
printf("#if BITS_PER_LONG == 64\n");