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authorHugh Dickins <hugh@veritas.com>2008-12-09 13:14:27 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2008-12-10 08:01:54 -0800
commit9c24624727f6d6c460e45762a408ca5f5b9b8ef2 (patch)
tree39f41dc5e46a9f0e1151963eb1d4f2b7ff77ee3d
parent6ee5a399d6a92a52646836a6e10faf255c16393e (diff)
KSYM_SYMBOL_LEN fixes
Miles Lane tailing /sys files hit a BUG which Pekka Enberg has tracked to my 966c8c12dc9e77f931e2281ba25d2f0244b06949 sprint_symbol(): use less stack exposing a bug in slub's list_locations() - kallsyms_lookup() writes a 0 to namebuf[KSYM_NAME_LEN-1], but that was beyond the end of page provided. The 100 slop which list_locations() allows at end of page looks roughly enough for all the other stuff it might print after the symbol before it checks again: break out KSYM_SYMBOL_LEN earlier than before. Latencytop and ftrace and are using KSYM_NAME_LEN buffers where they need KSYM_SYMBOL_LEN buffers, and vmallocinfo a 2*KSYM_NAME_LEN buffer where it wants a KSYM_SYMBOL_LEN buffer: fix those before anyone copies them. [akpm@linux-foundation.org: ftrace.h needs module.h] Signed-off-by: Hugh Dickins <hugh@veritas.com> Cc: Christoph Lameter <cl@linux-foundation.org> Cc Miles Lane <miles.lane@gmail.com> Acked-by: Pekka Enberg <penberg@cs.helsinki.fi> Acked-by: Steven Rostedt <srostedt@redhat.com> Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/proc/base.c2
-rw-r--r--include/linux/ftrace.h3
-rw-r--r--kernel/latencytop.c2
-rw-r--r--mm/slub.c2
-rw-r--r--mm/vmalloc.c2
5 files changed, 6 insertions, 5 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 486cf3fe7139..d4677603c889 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -371,7 +371,7 @@ static int lstats_show_proc(struct seq_file *m, void *v)
task->latency_record[i].time,
task->latency_record[i].max);
for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
- char sym[KSYM_NAME_LEN];
+ char sym[KSYM_SYMBOL_LEN];
char *c;
if (!task->latency_record[i].backtrace[q])
break;
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 703eb53cfa2b..9c5bc6be2b09 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -6,6 +6,7 @@
#include <linux/ktime.h>
#include <linux/init.h>
#include <linux/types.h>
+#include <linux/module.h>
#include <linux/kallsyms.h>
#ifdef CONFIG_FUNCTION_TRACER
@@ -231,7 +232,7 @@ ftrace_init_module(unsigned long *start, unsigned long *end) { }
struct boot_trace {
pid_t caller;
- char func[KSYM_NAME_LEN];
+ char func[KSYM_SYMBOL_LEN];
int result;
unsigned long long duration; /* usecs */
ktime_t calltime;
diff --git a/kernel/latencytop.c b/kernel/latencytop.c
index 5e7b45c56923..449db466bdbc 100644
--- a/kernel/latencytop.c
+++ b/kernel/latencytop.c
@@ -191,7 +191,7 @@ static int lstats_show(struct seq_file *m, void *v)
latency_record[i].time,
latency_record[i].max);
for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
- char sym[KSYM_NAME_LEN];
+ char sym[KSYM_SYMBOL_LEN];
char *c;
if (!latency_record[i].backtrace[q])
break;
diff --git a/mm/slub.c b/mm/slub.c
index 749588a50a5a..a2cd47d89e0a 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3597,7 +3597,7 @@ static int list_locations(struct kmem_cache *s, char *buf,
for (i = 0; i < t.count; i++) {
struct location *l = &t.loc[i];
- if (len > PAGE_SIZE - 100)
+ if (len > PAGE_SIZE - KSYM_SYMBOL_LEN - 100)
break;
len += sprintf(buf + len, "%7ld ", l->count);
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index f3f6e0758562..1ddb77ba3995 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1717,7 +1717,7 @@ static int s_show(struct seq_file *m, void *p)
v->addr, v->addr + v->size, v->size);
if (v->caller) {
- char buff[2 * KSYM_NAME_LEN];
+ char buff[KSYM_SYMBOL_LEN];
seq_putc(m, ' ');
sprint_symbol(buff, (unsigned long)v->caller);

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