From 16a2164bb03612efe79a76c73da6da44445b9287 Mon Sep 17 00:00:00 2001
From: Hugh Dickins <hughd@google.com>
Date: Fri, 14 May 2010 19:44:10 -0700
Subject: [PATCH] profile: fix stats and data leakage
If the kernel is large or the profiling step small, /proc/profile
leaks data and readprofile shows silly stats, until readprofile -r
has reset the buffer: clear the prof_buffer when it is vmalloc()ed.
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
kernel/profile.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/kernel/profile.c b/kernel/profile.c
index a55d3a367ae8..dfadc5b729f1 100644
--- a/kernel/profile.c
+++ b/kernel/profile.c
@@ -127,8 +127,10 @@ int __ref profile_init(void)
return 0;
prof_buffer = vmalloc(buffer_bytes);
- if (prof_buffer)
+ if (prof_buffer) {
+ memset(prof_buffer, 0, buffer_bytes);
return 0;
+ }
free_cpumask_var(prof_cpu_mask);
return -ENOMEM;
--
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