mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-10-01 01:35:54 -04:00
194 lines
6.0 KiB
Diff
194 lines
6.0 KiB
Diff
From de875dd095d3ec0906c77518d28f793e6c69a9da Mon Sep 17 00:00:00 2001
|
|
From: Siva Kumar Akkireddi <sivaa@codeaurora.org>
|
|
Date: Thu, 11 May 2017 15:29:47 +0530
|
|
Subject: msm: sps: Fix race condition in SPS debugfs APIs
|
|
|
|
SPS debugfs APIs can be called concurrently which can result
|
|
in dangling pointer access. This change synchronizes access
|
|
to the SPS debugfs buffer.
|
|
|
|
Change-Id: I409b3f0618f760cb67eba47b43c81d166cdae4aa
|
|
Signed-off-by: Siva Kumar Akkireddi <sivaa@codeaurora.org>
|
|
---
|
|
drivers/platform/msm/sps/sps.c | 15 ++++++++++++++-
|
|
drivers/platform/msm/sps/spsi.h | 17 -----------------
|
|
2 files changed, 14 insertions(+), 18 deletions(-)
|
|
|
|
diff --git a/drivers/platform/msm/sps/sps.c b/drivers/platform/msm/sps/sps.c
|
|
index b812960..e2abeaf 100644
|
|
--- a/drivers/platform/msm/sps/sps.c
|
|
+++ b/drivers/platform/msm/sps/sps.c
|
|
@@ -1,4 +1,4 @@
|
|
-/* Copyright (c) 2011-2016 , The Linux Foundation. All rights reserved.
|
|
+/* Copyright (c) 2011-2017, The Linux Foundation. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 and
|
|
@@ -67,6 +67,7 @@ static char *debugfs_buf;
|
|
static u32 debugfs_buf_size;
|
|
static u32 debugfs_buf_used;
|
|
static int wraparound;
|
|
+static struct mutex sps_debugfs_lock;
|
|
|
|
struct dentry *dent;
|
|
struct dentry *dfile_info;
|
|
@@ -85,6 +86,7 @@ static struct sps_bam *phy2bam(phys_addr_t phys_addr);
|
|
/* record debug info for debugfs */
|
|
void sps_debugfs_record(const char *msg)
|
|
{
|
|
+ mutex_lock(&sps_debugfs_lock);
|
|
if (debugfs_record_enabled) {
|
|
if (debugfs_buf_used + MAX_MSG_LEN >= debugfs_buf_size) {
|
|
debugfs_buf_used = 0;
|
|
@@ -98,6 +100,7 @@ void sps_debugfs_record(const char *msg)
|
|
debugfs_buf_size - debugfs_buf_used,
|
|
"\n**** end line of sps log ****\n\n");
|
|
}
|
|
+ mutex_unlock(&sps_debugfs_lock);
|
|
}
|
|
|
|
/* read the recorded debug info to userspace */
|
|
@@ -107,6 +110,7 @@ static ssize_t sps_read_info(struct file *file, char __user *ubuf,
|
|
int ret = 0;
|
|
int size;
|
|
|
|
+ mutex_lock(&sps_debugfs_lock);
|
|
if (debugfs_record_enabled) {
|
|
if (wraparound)
|
|
size = debugfs_buf_size - MAX_MSG_LEN;
|
|
@@ -116,6 +120,7 @@ static ssize_t sps_read_info(struct file *file, char __user *ubuf,
|
|
ret = simple_read_from_buffer(ubuf, count, ppos,
|
|
debugfs_buf, size);
|
|
}
|
|
+ mutex_unlock(&sps_debugfs_lock);
|
|
|
|
return ret;
|
|
}
|
|
@@ -161,11 +166,13 @@ static ssize_t sps_set_info(struct file *file, const char __user *buf,
|
|
|
|
new_buf_size = buf_size_kb * SZ_1K;
|
|
|
|
+ mutex_lock(&sps_debugfs_lock);
|
|
if (debugfs_record_enabled) {
|
|
if (debugfs_buf_size == new_buf_size) {
|
|
/* need do nothing */
|
|
pr_info("sps:debugfs: input buffer size "
|
|
"is the same as before.\n");
|
|
+ mutex_unlock(&sps_debugfs_lock);
|
|
return count;
|
|
} else {
|
|
/* release the current buffer */
|
|
@@ -185,12 +192,14 @@ static ssize_t sps_set_info(struct file *file, const char __user *buf,
|
|
if (!debugfs_buf) {
|
|
debugfs_buf_size = 0;
|
|
pr_err("sps:fail to allocate memory for debug_fs.\n");
|
|
+ mutex_unlock(&sps_debugfs_lock);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
debugfs_buf_used = 0;
|
|
wraparound = false;
|
|
debugfs_record_enabled = true;
|
|
+ mutex_unlock(&sps_debugfs_lock);
|
|
|
|
return count;
|
|
}
|
|
@@ -239,6 +248,7 @@ static ssize_t sps_set_logging_option(struct file *file, const char __user *buf,
|
|
return count;
|
|
}
|
|
|
|
+ mutex_lock(&sps_debugfs_lock);
|
|
if (((option == 0) || (option == 2)) &&
|
|
((logging_option == 1) || (logging_option == 3))) {
|
|
debugfs_record_enabled = false;
|
|
@@ -250,6 +260,7 @@ static ssize_t sps_set_logging_option(struct file *file, const char __user *buf,
|
|
}
|
|
|
|
logging_option = option;
|
|
+ mutex_unlock(&sps_debugfs_lock);
|
|
|
|
return count;
|
|
}
|
|
@@ -587,6 +598,8 @@ static void sps_debugfs_init(void)
|
|
goto bam_log_level_err;
|
|
}
|
|
|
|
+ mutex_init(&sps_debugfs_lock);
|
|
+
|
|
return;
|
|
|
|
bam_log_level_err:
|
|
diff --git a/drivers/platform/msm/sps/spsi.h b/drivers/platform/msm/sps/spsi.h
|
|
index ccf761e..abf4b04 100644
|
|
--- a/drivers/platform/msm/sps/spsi.h
|
|
+++ b/drivers/platform/msm/sps/spsi.h
|
|
@@ -145,11 +145,6 @@ extern u8 print_limit_option;
|
|
pr_info(msg, ##args); \
|
|
} \
|
|
} while (0)
|
|
-#define SPS_DEBUGFS(msg, args...) do { \
|
|
- char buf[MAX_MSG_LEN]; \
|
|
- snprintf(buf, MAX_MSG_LEN, msg"\n", ##args); \
|
|
- sps_debugfs_record(buf); \
|
|
- } while (0)
|
|
#define SPS_ERR(dev, msg, args...) do { \
|
|
if (logging_option != 1) { \
|
|
if (unlikely(print_limit_option > 2)) \
|
|
@@ -157,8 +152,6 @@ extern u8 print_limit_option;
|
|
else \
|
|
pr_err(msg, ##args); \
|
|
} \
|
|
- if (unlikely(debugfs_record_enabled)) \
|
|
- SPS_DEBUGFS(msg, ##args); \
|
|
SPS_IPC(3, dev, msg, args); \
|
|
} while (0)
|
|
#define SPS_INFO(dev, msg, args...) do { \
|
|
@@ -168,8 +161,6 @@ extern u8 print_limit_option;
|
|
else \
|
|
pr_info(msg, ##args); \
|
|
} \
|
|
- if (unlikely(debugfs_record_enabled)) \
|
|
- SPS_DEBUGFS(msg, ##args); \
|
|
SPS_IPC(3, dev, msg, args); \
|
|
} while (0)
|
|
#define SPS_DBG(dev, msg, args...) do { \
|
|
@@ -181,8 +172,6 @@ extern u8 print_limit_option;
|
|
pr_info(msg, ##args); \
|
|
} else \
|
|
pr_debug(msg, ##args); \
|
|
- if (unlikely(debugfs_record_enabled)) \
|
|
- SPS_DEBUGFS(msg, ##args); \
|
|
if (dev) { \
|
|
if ((dev)->ipc_loglevel <= 0) \
|
|
SPS_IPC(0, dev, msg, args); \
|
|
@@ -197,8 +186,6 @@ extern u8 print_limit_option;
|
|
pr_info(msg, ##args); \
|
|
} else \
|
|
pr_debug(msg, ##args); \
|
|
- if (unlikely(debugfs_record_enabled)) \
|
|
- SPS_DEBUGFS(msg, ##args); \
|
|
if (dev) { \
|
|
if ((dev)->ipc_loglevel <= 1) \
|
|
SPS_IPC(1, dev, msg, args); \
|
|
@@ -213,8 +200,6 @@ extern u8 print_limit_option;
|
|
pr_info(msg, ##args); \
|
|
} else \
|
|
pr_debug(msg, ##args); \
|
|
- if (unlikely(debugfs_record_enabled)) \
|
|
- SPS_DEBUGFS(msg, ##args); \
|
|
if (dev) { \
|
|
if ((dev)->ipc_loglevel <= 2) \
|
|
SPS_IPC(2, dev, msg, args); \
|
|
@@ -229,8 +214,6 @@ extern u8 print_limit_option;
|
|
pr_info(msg, ##args); \
|
|
} else \
|
|
pr_debug(msg, ##args); \
|
|
- if (unlikely(debugfs_record_enabled)) \
|
|
- SPS_DEBUGFS(msg, ##args); \
|
|
if (dev) { \
|
|
if ((dev)->ipc_loglevel <= 3) \
|
|
SPS_IPC(3, dev, msg, args); \
|
|
--
|
|
cgit v1.1
|
|
|