Quelle kallsyms.c Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
* kallsyms.c: in-kernel printing of symbolic oopses and stack traces.
*
* Rewritten and vastly simplified by Rusty Russell for in-kernel
* module loader:
*   Copyright 2002 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
*
* ChangeLog:
*
* (25/Aug/2004) Paulo Marques <pmarques@grupopie.com>
*      Changed the compression method from stem compression to "table lookup"
*      compression (see scripts/kallsyms.c for a more complete description)
*/
#include <linux/kallsyms.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <linux/fs.h>
#include <linux/kdb.h>
#include <linux/err.h>
#include <linux/proc_fs.h>
#include <linux/sched.h> /* for cond_resched */
#include <linux/ctype.h>
#include <linux/slab.h>
#include <linux/filter.h>
#include <linux/ftrace.h>
#include <linux/kprobes.h>
#include <linux/build_bug.h>
#include <linux/compiler.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/bsearch.h>
#include <linux/btf_ids.h>

#include "kallsyms_internal.h"

/*
* Expand a compressed symbol data into the resulting uncompressed string,
* if uncompressed string is too long (>= maxlen), it will be truncated,
* given the offset to where the symbol is in the compressed stream.
*/
static unsigned int kallsyms_expand_symbol(unsigned int off,
        char *result, size_t maxlen)
{
int len, skipped_first = 0;
const char *tptr;
const u8 *data;

/* Get the compressed symbol length from the first symbol byte. */
data = &kallsyms_names[off];
len = *data;
data++;
off++;

/* If MSB is 1, it is a "big" symbol, so needs an additional byte. */
if ((len & 0x80) != 0) {
  len = (len & 0x7F) | (*data << 7);
  data++;
  off++;
}

/*
* Update the offset to return the offset for the next symbol on
* the compressed stream.
*/
off += len;

/*
* For every byte on the compressed symbol data, copy the table
* entry for that byte.
*/
while (len) {
  tptr = &kallsyms_token_table[kallsyms_token_index[*data]];
  data++;
  len--;

  while (*tptr) {
   if (skipped_first) {
    if (maxlen <= 1)
     goto tail;
    *result = *tptr;
    result++;
    maxlen--;
   } else
    skipped_first = 1;
   tptr++;
  }
}

tail:
if (maxlen)
  *result = '\0';

/* Return to offset to the next symbol. */
return off;
}

/*
* Get symbol type information. This is encoded as a single char at the
* beginning of the symbol name.
*/
static char kallsyms_get_symbol_type(unsigned int off)
{
/*
* Get just the first code, look it up in the token table,
* and return the first char from this token.
*/
return kallsyms_token_table[kallsyms_token_index[kallsyms_names[off + 1]]];
}

/*
* Find the offset on the compressed stream given and index in the
* kallsyms array.
*/
static unsigned int get_symbol_offset(unsigned long pos)
{
const u8 *name;
int i, len;

/*
* Use the closest marker we have. We have markers every 256 positions,
* so that should be close enough.
*/
name = &kallsyms_names[kallsyms_markers[pos >> 8]];

/*
* Sequentially scan all the symbols up to the point we're searching
* for. Every symbol is stored in a [<len>][<len> bytes of data] format,
* so we just need to add the len to the current pointer for every
* symbol we wish to skip.
*/
for (i = 0; i < (pos & 0xFF); i++) {
  len = *name;

  /*
* If MSB is 1, it is a "big" symbol, so we need to look into
* the next byte (and skip it, too).
*/
  if ((len & 0x80) != 0)
   len = ((len & 0x7F) | (name[1] << 7)) + 1;

  name = name + len + 1;
}

return name - kallsyms_names;
}

unsigned long kallsyms_sym_address(int idx)
{
/* values are unsigned offsets */
return kallsyms_relative_base + (u32)kallsyms_offsets[idx];
}

static unsigned int get_symbol_seq(int index)
{
unsigned int i, seq = 0;

for (i = 0; i < 3; i++)
  seq = (seq << 8) | kallsyms_seqs_of_names[3 * index + i];

return seq;
}

static int kallsyms_lookup_names(const char *name,
     unsigned int *start,
     unsigned int *end)
{
int ret;
int low, mid, high;
unsigned int seq, off;
char namebuf[KSYM_NAME_LEN];

low = 0;
high = kallsyms_num_syms - 1;

while (low <= high) {
  mid = low + (high - low) / 2;
  seq = get_symbol_seq(mid);
  off = get_symbol_offset(seq);
  kallsyms_expand_symbol(off, namebuf, ARRAY_SIZE(namebuf));
  ret = strcmp(name, namebuf);
  if (ret > 0)
   low = mid + 1;
  else if (ret < 0)
   high = mid - 1;
  else
   break;
}

if (low > high)
  return -ESRCH;

low = mid;
while (low) {
  seq = get_symbol_seq(low - 1);
  off = get_symbol_offset(seq);
  kallsyms_expand_symbol(off, namebuf, ARRAY_SIZE(namebuf));
  if (strcmp(name, namebuf))
   break;
  low--;
}
*start = low;

if (end) {
  high = mid;
  while (high < kallsyms_num_syms - 1) {
   seq = get_symbol_seq(high + 1);
   off = get_symbol_offset(seq);
   kallsyms_expand_symbol(off, namebuf, ARRAY_SIZE(namebuf));
   if (strcmp(name, namebuf))
    break;
   high++;
  }
  *end = high;
}

return 0;
}

/* Lookup the address for this symbol. Returns 0 if not found. */
unsigned long kallsyms_lookup_name(const char *name)
{
int ret;
unsigned int i;

/* Skip the search for empty string. */
if (!*name)
  return 0;

ret = kallsyms_lookup_names(name, &i, NULL);
if (!ret)
  return kallsyms_sym_address(get_symbol_seq(i));

return module_kallsyms_lookup_name(name);
}

/*
* Iterate over all symbols in vmlinux.  For symbols from modules use
* module_kallsyms_on_each_symbol instead.
*/
int kallsyms_on_each_symbol(int (*fn)(void *, const char *, unsigned long),
       void *data)
{
char namebuf[KSYM_NAME_LEN];
unsigned long i;
unsigned int off;
int ret;

for (i = 0, off = 0; i < kallsyms_num_syms; i++) {
  off = kallsyms_expand_symbol(off, namebuf, ARRAY_SIZE(namebuf));
  ret = fn(data, namebuf, kallsyms_sym_address(i));
  if (ret != 0)
   return ret;
  cond_resched();
}
return 0;
}

int kallsyms_on_each_match_symbol(int (*fn)(void *, unsigned long),
      const char *name, void *data)
{
int ret;
unsigned int i, start, end;

ret = kallsyms_lookup_names(name, &start, &end);
if (ret)
  return 0;

for (i = start; !ret && i <= end; i++) {
  ret = fn(data, kallsyms_sym_address(get_symbol_seq(i)));
  cond_resched();
}

return ret;
}

static unsigned long get_symbol_pos(unsigned long addr,
        unsigned long *symbolsize,
        unsigned long *offset)
{
unsigned long symbol_start = 0, symbol_end = 0;
unsigned long i, low, high, mid;

/* Do a binary search on the sorted kallsyms_offsets array. */
low = 0;
high = kallsyms_num_syms;

while (high - low > 1) {
  mid = low + (high - low) / 2;
  if (kallsyms_sym_address(mid) <= addr)
   low = mid;
  else
   high = mid;
}

/*
* Search for the first aliased symbol. Aliased
* symbols are symbols with the same address.
*/
while (low && kallsyms_sym_address(low-1) == kallsyms_sym_address(low))
  --low;

symbol_start = kallsyms_sym_address(low);

/* Search for next non-aliased symbol. */
for (i = low + 1; i < kallsyms_num_syms; i++) {
  if (kallsyms_sym_address(i) > symbol_start) {
   symbol_end = kallsyms_sym_address(i);
   break;
  }
}

/* If we found no next symbol, we use the end of the section. */
if (!symbol_end) {
  if (is_kernel_inittext(addr))
   symbol_end = (unsigned long)_einittext;
  else if (IS_ENABLED(CONFIG_KALLSYMS_ALL))
   symbol_end = (unsigned long)_end;
  else
   symbol_end = (unsigned long)_etext;
}

if (symbolsize)
  *symbolsize = symbol_end - symbol_start;
if (offset)
  *offset = addr - symbol_start;

return low;
}

/*
* Lookup an address but don't bother to find any names.
*/
int kallsyms_lookup_size_offset(unsigned long addr, unsigned long *symbolsize,
    unsigned long *offset)
{
char namebuf[KSYM_NAME_LEN];

if (is_ksym_addr(addr)) {
  get_symbol_pos(addr, symbolsize, offset);
  return 1;
}
return !!module_address_lookup(addr, symbolsize, offset, NULL, NULL, namebuf) ||
        !!__bpf_address_lookup(addr, symbolsize, offset, namebuf);
}

static int kallsyms_lookup_buildid(unsigned long addr,
   unsigned long *symbolsize,
   unsigned long *offset, char **modname,
   const unsigned char **modbuildid, char *namebuf)
{
int ret;

namebuf[KSYM_NAME_LEN - 1] = 0;
namebuf[0] = 0;

if (is_ksym_addr(addr)) {
  unsigned long pos;

  pos = get_symbol_pos(addr, symbolsize, offset);
  /* Grab name */
  kallsyms_expand_symbol(get_symbol_offset(pos),
           namebuf, KSYM_NAME_LEN);
  if (modname)
   *modname = NULL;
  if (modbuildid)
   *modbuildid = NULL;

  return strlen(namebuf);
}

/* See if it's in a module or a BPF JITed image. */
ret = module_address_lookup(addr, symbolsize, offset,
        modname, modbuildid, namebuf);
if (!ret)
  ret = bpf_address_lookup(addr, symbolsize,
      offset, modname, namebuf);

if (!ret)
  ret = ftrace_mod_address_lookup(addr, symbolsize,
      offset, modname, namebuf);

return ret;
}

/*
* Lookup an address
* - modname is set to NULL if it's in the kernel.
* - We guarantee that the returned name is valid until we reschedule even if.
*   It resides in a module.
* - We also guarantee that modname will be valid until rescheduled.
*/
const char *kallsyms_lookup(unsigned long addr,
       unsigned long *symbolsize,
       unsigned long *offset,
       char **modname, char *namebuf)
{
int ret = kallsyms_lookup_buildid(addr, symbolsize, offset, modname,
       NULL, namebuf);

if (!ret)
  return NULL;

return namebuf;
}

int lookup_symbol_name(unsigned long addr, char *symname)
{
symname[0] = '\0';
symname[KSYM_NAME_LEN - 1] = '\0';

if (is_ksym_addr(addr)) {
  unsigned long pos;

  pos = get_symbol_pos(addr, NULL, NULL);
  /* Grab name */
  kallsyms_expand_symbol(get_symbol_offset(pos),
           symname, KSYM_NAME_LEN);
  return 0;
}
/* See if it's in a module. */
return lookup_module_symbol_name(addr, symname);
}

/* Look up a kernel symbol and return it in a text buffer. */
static int __sprint_symbol(char *buffer, unsigned long address,
      int symbol_offset, int add_offset, int add_buildid)
{
char *modname;
const unsigned char *buildid;
unsigned long offset, size;
int len;

address += symbol_offset;
len = kallsyms_lookup_buildid(address, &size, &offset, &modname, &buildid,
           buffer);
if (!len)
  return sprintf(buffer, "0x%lx", address - symbol_offset);

offset -= symbol_offset;

if (add_offset)
  len += sprintf(buffer + len, "+%#lx/%#lx", offset, size);

if (modname) {
  len += sprintf(buffer + len, " [%s", modname);
#if IS_ENABLED(CONFIG_STACKTRACE_BUILD_ID)
  if (add_buildid && buildid) {
   /* build ID should match length of sprintf */
#if IS_ENABLED(CONFIG_MODULES)
   static_assert(sizeof(typeof_member(struct module, build_id)) == 20);
#endif
   len += sprintf(buffer + len, " %20phN", buildid);
  }
#endif
  len += sprintf(buffer + len, "]");
}

return len;
}

/**
* sprint_symbol - Look up a kernel symbol and return it in a text buffer
* @buffer: buffer to be stored
* @address: address to lookup
*
* This function looks up a kernel symbol with @address and stores its name,
* offset, size and module name to @buffer if possible. If no symbol was found,
* just saves its @address as is.
*
* This function returns the number of bytes stored in @buffer.
*/
int sprint_symbol(char *buffer, unsigned long address)
{
return __sprint_symbol(buffer, address, 0, 1, 0);
}
EXPORT_SYMBOL_GPL(sprint_symbol);

/**
* sprint_symbol_build_id - Look up a kernel symbol and return it in a text buffer
* @buffer: buffer to be stored
* @address: address to lookup
*
* This function looks up a kernel symbol with @address and stores its name,
* offset, size, module name and module build ID to @buffer if possible. If no
* symbol was found, just saves its @address as is.
*
* This function returns the number of bytes stored in @buffer.
*/
int sprint_symbol_build_id(char *buffer, unsigned long address)
{
return __sprint_symbol(buffer, address, 0, 1, 1);
}
EXPORT_SYMBOL_GPL(sprint_symbol_build_id);

/**
* sprint_symbol_no_offset - Look up a kernel symbol and return it in a text buffer
* @buffer: buffer to be stored
* @address: address to lookup
*
* This function looks up a kernel symbol with @address and stores its name
* and module name to @buffer if possible. If no symbol was found, just saves
* its @address as is.
*
* This function returns the number of bytes stored in @buffer.
*/
int sprint_symbol_no_offset(char *buffer, unsigned long address)
{
return __sprint_symbol(buffer, address, 0, 0, 0);
}
EXPORT_SYMBOL_GPL(sprint_symbol_no_offset);

/**
* sprint_backtrace - Look up a backtrace symbol and return it in a text buffer
* @buffer: buffer to be stored
* @address: address to lookup
*
* This function is for stack backtrace and does the same thing as
* sprint_symbol() but with modified/decreased @address. If there is a
* tail-call to the function marked "noreturn", gcc optimized out code after
* the call so that the stack-saved return address could point outside of the
* caller. This function ensures that kallsyms will find the original caller
* by decreasing @address.
*
* This function returns the number of bytes stored in @buffer.
*/
int sprint_backtrace(char *buffer, unsigned long address)
{
return __sprint_symbol(buffer, address, -1, 1, 0);
}

/**
* sprint_backtrace_build_id - Look up a backtrace symbol and return it in a text buffer
* @buffer: buffer to be stored
* @address: address to lookup
*
* This function is for stack backtrace and does the same thing as
* sprint_symbol() but with modified/decreased @address. If there is a
* tail-call to the function marked "noreturn", gcc optimized out code after
* the call so that the stack-saved return address could point outside of the
* caller. This function ensures that kallsyms will find the original caller
* by decreasing @address. This function also appends the module build ID to
* the @buffer if @address is within a kernel module.
*
* This function returns the number of bytes stored in @buffer.
*/
int sprint_backtrace_build_id(char *buffer, unsigned long address)
{
return __sprint_symbol(buffer, address, -1, 1, 1);
}

/* To avoid using get_symbol_offset for every symbol, we carry prefix along. */
struct kallsym_iter {
loff_t pos;
loff_t pos_mod_end;
loff_t pos_ftrace_mod_end;
loff_t pos_bpf_end;
unsigned long value;
unsigned int nameoff; /* If iterating in core kernel symbols. */
char type;
char name[KSYM_NAME_LEN];
char module_name[MODULE_NAME_LEN];
int exported;
int show_value;
};

static int get_ksymbol_mod(struct kallsym_iter *iter)
{
int ret = module_get_kallsym(iter->pos - kallsyms_num_syms,
         &iter->value, &iter->type,
         iter->name, iter->module_name,
         &iter->exported);
if (ret < 0) {
  iter->pos_mod_end = iter->pos;
  return 0;
}

return 1;
}

/*
* ftrace_mod_get_kallsym() may also get symbols for pages allocated for ftrace
* purposes. In that case "__builtin__ftrace" is used as a module name, even
* though "__builtin__ftrace" is not a module.
*/
static int get_ksymbol_ftrace_mod(struct kallsym_iter *iter)
{
int ret = ftrace_mod_get_kallsym(iter->pos - iter->pos_mod_end,
      &iter->value, &iter->type,
      iter->name, iter->module_name,
      &iter->exported);
if (ret < 0) {
  iter->pos_ftrace_mod_end = iter->pos;
  return 0;
}

return 1;
}

static int get_ksymbol_bpf(struct kallsym_iter *iter)
{
int ret;

strscpy(iter->module_name, "bpf", MODULE_NAME_LEN);
iter->exported = 0;
ret = bpf_get_kallsym(iter->pos - iter->pos_ftrace_mod_end,
         &iter->value, &iter->type,
         iter->name);
if (ret < 0) {
  iter->pos_bpf_end = iter->pos;
  return 0;
}

return 1;
}

/*
* This uses "__builtin__kprobes" as a module name for symbols for pages
* allocated for kprobes' purposes, even though "__builtin__kprobes" is not a
* module.
*/
static int get_ksymbol_kprobe(struct kallsym_iter *iter)
{
strscpy(iter->module_name, "__builtin__kprobes", MODULE_NAME_LEN);
iter->exported = 0;
return kprobe_get_kallsym(iter->pos - iter->pos_bpf_end,
      &iter->value, &iter->type,
      iter->name) < 0 ? 0 : 1;
}

/* Returns space to next name. */
static unsigned long get_ksymbol_core(struct kallsym_iter *iter)
{
unsigned off = iter->nameoff;

iter->module_name[0] = '\0';
iter->value = kallsyms_sym_address(iter->pos);

iter->type = kallsyms_get_symbol_type(off);

off = kallsyms_expand_symbol(off, iter->name, ARRAY_SIZE(iter->name));

return off - iter->nameoff;
}

static void reset_iter(struct kallsym_iter *iter, loff_t new_pos)
{
iter->name[0] = '\0';
iter->nameoff = get_symbol_offset(new_pos);
iter->pos = new_pos;
if (new_pos == 0) {
  iter->pos_mod_end = 0;
  iter->pos_ftrace_mod_end = 0;
  iter->pos_bpf_end = 0;
}
}

/*
* The end position (last + 1) of each additional kallsyms section is recorded
* in iter->pos_..._end as each section is added, and so can be used to
* determine which get_ksymbol_...() function to call next.
*/
static int update_iter_mod(struct kallsym_iter *iter, loff_t pos)
{
iter->pos = pos;

if ((!iter->pos_mod_end || iter->pos_mod_end > pos) &&
     get_ksymbol_mod(iter))
  return 1;

if ((!iter->pos_ftrace_mod_end || iter->pos_ftrace_mod_end > pos) &&
     get_ksymbol_ftrace_mod(iter))
  return 1;

if ((!iter->pos_bpf_end || iter->pos_bpf_end > pos) &&
     get_ksymbol_bpf(iter))
  return 1;

return get_ksymbol_kprobe(iter);
}

/* Returns false if pos at or past end of file. */
static int update_iter(struct kallsym_iter *iter, loff_t pos)
{
/* Module symbols can be accessed randomly. */
if (pos >= kallsyms_num_syms)
  return update_iter_mod(iter, pos);

/* If we're not on the desired position, reset to new position. */
if (pos != iter->pos)
  reset_iter(iter, pos);

iter->nameoff += get_ksymbol_core(iter);
iter->pos++;

return 1;
}

static void *s_next(struct seq_file *m, void *p, loff_t *pos)
{
(*pos)++;

if (!update_iter(m->private, *pos))
  return NULL;
return p;
}

static void *s_start(struct seq_file *m, loff_t *pos)
{
if (!update_iter(m->private, *pos))
  return NULL;
return m->private;
}

static void s_stop(struct seq_file *m, void *p)
{
}

static int s_show(struct seq_file *m, void *p)
{
void *value;
struct kallsym_iter *iter = m->private;

/* Some debugging symbols have no name.  Ignore them. */
if (!iter->name[0])
  return 0;

value = iter->show_value ? (void *)iter->value : NULL;

if (iter->module_name[0]) {
  char type;

  /*
* Label it "global" if it is exported,
* "local" if not exported.
*/
  type = iter->exported ? toupper(iter->type) :
     tolower(iter->type);
  seq_printf(m, "%px %c %s\t[%s]\n", value,
      type, iter->name, iter->module_name);
} else
  seq_printf(m, "%px %c %s\n", value,
      iter->type, iter->name);
return 0;
}

static const struct seq_operations kallsyms_op = {
.start = s_start,
.next = s_next,
.stop = s_stop,
.show = s_show
};

#ifdef CONFIG_BPF_SYSCALL

struct bpf_iter__ksym {
__bpf_md_ptr(struct bpf_iter_meta *, meta);
__bpf_md_ptr(struct kallsym_iter *, ksym);
};

static int ksym_prog_seq_show(struct seq_file *m, bool in_stop)
{
struct bpf_iter__ksym ctx;
struct bpf_iter_meta meta;
struct bpf_prog *prog;

meta.seq = m;
prog = bpf_iter_get_info(&meta, in_stop);
if (!prog)
  return 0;

ctx.meta = &meta;
ctx.ksym = m ? m->private : NULL;
return bpf_iter_run_prog(prog, &ctx);
}

static int bpf_iter_ksym_seq_show(struct seq_file *m, void *p)
{
return ksym_prog_seq_show(m, false);
}

static void bpf_iter_ksym_seq_stop(struct seq_file *m, void *p)
{
if (!p)
  (void) ksym_prog_seq_show(m, true);
else
  s_stop(m, p);
}

static const struct seq_operations bpf_iter_ksym_ops = {
.start = s_start,
.next = s_next,
.stop = bpf_iter_ksym_seq_stop,
.show = bpf_iter_ksym_seq_show,
};

static int bpf_iter_ksym_init(void *priv_data, struct bpf_iter_aux_info *aux)
{
struct kallsym_iter *iter = priv_data;

reset_iter(iter, 0);

/* cache here as in kallsyms_open() case; use current process
* credentials to tell BPF iterators if values should be shown.
*/
iter->show_value = kallsyms_show_value(current_cred());

return 0;
}

DEFINE_BPF_ITER_FUNC(ksym, struct bpf_iter_meta *meta, struct kallsym_iter *ksym)

static const struct bpf_iter_seq_info ksym_iter_seq_info = {
.seq_ops  = &bpf_iter_ksym_ops,
.init_seq_private = bpf_iter_ksym_init,
.fini_seq_private = NULL,
.seq_priv_size  = sizeof(struct kallsym_iter),
};

static struct bpf_iter_reg ksym_iter_reg_info = {
.target                 = "ksym",
.feature  = BPF_ITER_RESCHED,
.ctx_arg_info_size = 1,
.ctx_arg_info  = {
  { offsetof(struct bpf_iter__ksym, ksym),
    PTR_TO_BTF_ID_OR_NULL },
},
.seq_info  = &ksym_iter_seq_info,
};

BTF_ID_LIST_SINGLE(btf_ksym_iter_id, struct, kallsym_iter)

static int __init bpf_ksym_iter_register(void)
{
ksym_iter_reg_info.ctx_arg_info[0].btf_id = *btf_ksym_iter_id;
return bpf_iter_reg_target(&ksym_iter_reg_info);
}

late_initcall(bpf_ksym_iter_register);

#endif /* CONFIG_BPF_SYSCALL */

static int kallsyms_open(struct inode *inode, struct file *file)
{
/*
* We keep iterator in m->private, since normal case is to
* s_start from where we left off, so we avoid doing
* using get_symbol_offset for every symbol.
*/
struct kallsym_iter *iter;
iter = __seq_open_private(file, &kallsyms_op, sizeof(*iter));
if (!iter)
  return -ENOMEM;
reset_iter(iter, 0);

/*
* Instead of checking this on every s_show() call, cache
* the result here at open time.
*/
iter->show_value = kallsyms_show_value(file->f_cred);
return 0;
}

#ifdef CONFIG_KGDB_KDB
const char *kdb_walk_kallsyms(loff_t *pos)
{
static struct kallsym_iter kdb_walk_kallsyms_iter;
if (*pos == 0) {
  memset(&kdb_walk_kallsyms_iter, 0,
         sizeof(kdb_walk_kallsyms_iter));
  reset_iter(&kdb_walk_kallsyms_iter, 0);
}
while (1) {
  if (!update_iter(&kdb_walk_kallsyms_iter, *pos))
   return NULL;
  ++*pos;
  /* Some debugging symbols have no name.  Ignore them. */
  if (kdb_walk_kallsyms_iter.name[0])
   return kdb_walk_kallsyms_iter.name;
}
}
#endif /* CONFIG_KGDB_KDB */

static const struct proc_ops kallsyms_proc_ops = {
.proc_open = kallsyms_open,
.proc_read = seq_read,
.proc_lseek = seq_lseek,
.proc_release = seq_release_private,
};

static int __init kallsyms_init(void)
{
proc_create("kallsyms", 0444, NULL, &kallsyms_proc_ops);
return 0;
}
device_initcall(kallsyms_init);

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