Re: [PATCH 0/2] (Was: perf_event_mmap(vma) && !vma->vm_mm)

[Peter Zijlstra <peterz@infradead.org>]

On Thu, Oct 17, 2013 at 05:27:17PM +0200, Oleg Nesterov wrote:
> On 10/17, Oleg Nesterov wrote:
> >
> > 	- we do not really need "len", we can simply do
> >
> > 		size = strlen(name) + 1;
> > 		while (size % sizeof(u64))
> > 			name[size++] = '\0';
> >
> > 	  although I won't argue if you dislike "size & 7" in while().
> 
> Or, perhaps,
> 
> 	while (!IS_ALIGNED(size, sizeof(u64)))
> 		name[size++] = '\0';
> 

---
Subject: perf: Change zero-padding of strings in perf_event_mmap_event()
From: Peter Zijlstra <peterz@infradead.org>
Date: Thu Oct 17 00:06:46 CEST 2013

Oleg complained about the excessive 0-ing in perf_event_mmap_event(),
so try and be smarter about it while keeping it fairly fool proof and
avoid leaking random bits out to userspace.

Suggested-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/n/tip-8jirlm99m6if2z13wd6rbyu6@git.kernel.org
---
 kernel/events/core.c |   17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -5106,15 +5106,13 @@ static void perf_event_mmap_event(struct
 	unsigned int size;
 	char tmp[16];
 	char *buf = NULL;
-	const char *name;
-
-	memset(tmp, 0, sizeof(tmp));
+	char *name;
 
 	if (file) {
 		struct inode *inode;
 		dev_t dev;
 
-		buf = kzalloc(PATH_MAX, GFP_KERNEL);
+		buf = kmalloc(PATH_MAX, GFP_KERNEL);
 		if (!buf) {
 			name = strncpy(tmp, "//enomem", sizeof(tmp));
 			goto got_name;
@@ -5137,7 +5135,7 @@ static void perf_event_mmap_event(struct
 		min = MINOR(dev);
 
 	} else {
-		name = arch_vma_name(vma);
+		name = (char *)arch_vma_name(vma);
 		if (name) {
 			name = strncpy(tmp, name, sizeof(tmp) - 1);
 			tmp[sizeof(tmp) - 1] = '\0';
@@ -5160,7 +5158,14 @@ static void perf_event_mmap_event(struct
 	}
 
 got_name:
-	size = ALIGN(strlen(name)+1, sizeof(u64));
+	/*
+	 * Since our buffer works in 8 byte units we need to align our string
+	 * size to a multiple of 8. However, we must guarantee the tail end is
+	 * zero'd out to avoid leaking random bits to userspace.
+	 */
+	size = strlen(name)+1;
+	while (!IS_ALIGNED(size, sizeof(u64)))
+		name[size++] = '\0';
 
 	mmap_event->file_name = name;
 	mmap_event->file_size = size;