4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Kees Cook <keescook@xxxxxxxxxxxx>
commit 1404297ebf76fd91a41de215fc8c94c2619e5fdb upstream.
Some callers of strtobool() were passing a pointer to unterminated
strings. In preparation of adding multi-character processing to
kstrtobool(), update the callers to not pass single-character pointers,
and switch to using the new kstrtobool_from_user() helper where
possible.
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Amitkumar Karwar <akarwar@xxxxxxxxxxx>
Cc: Nishant Sarmukadam <nishants@xxxxxxxxxxx>
Cc: Kalle Valo <kvalo@xxxxxxxxxxxxxx>
Cc: Steve French <sfrench@xxxxxxxxx>
Cc: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
Cc: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Joe Perches <joe@xxxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
[removed mwifiex driver change as it was correct and not needed for 4.4.y]
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/cifs/cifs_debug.c | 56 ++++++++++++---------------------------------------
fs/cifs/cifs_debug.h | 2 -
fs/cifs/cifsfs.c | 6 ++---
fs/cifs/cifsglob.h | 4 +--
4 files changed, 20 insertions(+), 48 deletions(-)
--- a/fs/cifs/cifs_debug.c
+++ b/fs/cifs/cifs_debug.c
@@ -255,7 +255,6 @@ static const struct file_operations cifs
static ssize_t cifs_stats_proc_write(struct file *file,
const char __user *buffer, size_t count, loff_t *ppos)
{
- char c;
bool bv;
int rc;
struct list_head *tmp1, *tmp2, *tmp3;
@@ -263,11 +262,8 @@ static ssize_t cifs_stats_proc_write(str
struct cifs_ses *ses;
struct cifs_tcon *tcon;
- rc = get_user(c, buffer);
- if (rc)
- return rc;
-
- if (strtobool(&c, &bv) == 0) {
+ rc = kstrtobool_from_user(buffer, count, &bv);
+ if (rc == 0) {
#ifdef CONFIG_CIFS_STATS2
atomic_set(&totBufAllocCount, 0);
atomic_set(&totSmBufAllocCount, 0);
@@ -290,6 +286,8 @@ static ssize_t cifs_stats_proc_write(str
}
}
spin_unlock(&cifs_tcp_ses_lock);
+ } else {
+ return rc;
}
return count;
@@ -433,17 +431,17 @@ static int cifsFYI_proc_open(struct inod
static ssize_t cifsFYI_proc_write(struct file *file, const char __user *buffer,
size_t count, loff_t *ppos)
{
- char c;
+ char c[2] = { '\0' };
bool bv;
int rc;
- rc = get_user(c, buffer);
+ rc = get_user(c[0], buffer);
if (rc)
return rc;
- if (strtobool(&c, &bv) == 0)
+ if (strtobool(c, &bv) == 0)
cifsFYI = bv;
- else if ((c > '1') && (c <= '9'))
- cifsFYI = (int) (c - '0'); /* see cifs_debug.h for meanings */
+ else if ((c[0] > '1') && (c[0] <= '9'))
+ cifsFYI = (int) (c[0] - '0'); /* see cifs_debug.h for meanings */
return count;
}
@@ -471,20 +469,12 @@ static int cifs_linux_ext_proc_open(stru
static ssize_t cifs_linux_ext_proc_write(struct file *file,
const char __user *buffer, size_t count, loff_t *ppos)
{
- char c;
- bool bv;
int rc;
- rc = get_user(c, buffer);
+ rc = kstrtobool_from_user(buffer, count, &linuxExtEnabled);
if (rc)
return rc;
- rc = strtobool(&c, &bv);
- if (rc)
- return rc;
-
- linuxExtEnabled = bv;
-
return count;
}
@@ -511,20 +501,12 @@ static int cifs_lookup_cache_proc_open(s
static ssize_t cifs_lookup_cache_proc_write(struct file *file,
const char __user *buffer, size_t count, loff_t *ppos)
{
- char c;
- bool bv;
int rc;
- rc = get_user(c, buffer);
+ rc = kstrtobool_from_user(buffer, count, &lookupCacheEnabled);
if (rc)
return rc;
- rc = strtobool(&c, &bv);
- if (rc)
- return rc;
-
- lookupCacheEnabled = bv;
-
return count;
}
@@ -551,20 +533,12 @@ static int traceSMB_proc_open(struct ino
static ssize_t traceSMB_proc_write(struct file *file, const char __user *buffer,
size_t count, loff_t *ppos)
{
- char c;
- bool bv;
int rc;
- rc = get_user(c, buffer);
+ rc = kstrtobool_from_user(buffer, count, &traceSMB);
if (rc)
return rc;
- rc = strtobool(&c, &bv);
- if (rc)
- return rc;
-
- traceSMB = bv;
-
return count;
}
@@ -622,7 +596,6 @@ static ssize_t cifs_security_flags_proc_
int rc;
unsigned int flags;
char flags_string[12];
- char c;
bool bv;
if ((count < 1) || (count > 11))
@@ -635,11 +608,10 @@ static ssize_t cifs_security_flags_proc_
if (count < 3) {
/* single char or single char followed by null */
- c = flags_string[0];
- if (strtobool(&c, &bv) == 0) {
+ if (strtobool(flags_string, &bv) == 0) {
global_secflags = bv ? CIFSSEC_MAX : CIFSSEC_DEF;
return count;
- } else if (!isdigit(c)) {
+ } else if (!isdigit(flags_string[0])) {
cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
flags_string);
return -EINVAL;
--- a/fs/cifs/cifs_debug.h
+++ b/fs/cifs/cifs_debug.h
@@ -25,7 +25,7 @@
void cifs_dump_mem(char *label, void *data, int length);
void cifs_dump_detail(void *);
void cifs_dump_mids(struct TCP_Server_Info *);
-extern int traceSMB; /* flag which enables the function below */
+extern bool traceSMB; /* flag which enables the function below */
void dump_smb(void *, int);
#define CIFS_INFO 0x01
#define CIFS_RC 0x02
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -54,10 +54,10 @@
#endif
int cifsFYI = 0;
-int traceSMB = 0;
+bool traceSMB;
bool enable_oplocks = true;
-unsigned int linuxExtEnabled = 1;
-unsigned int lookupCacheEnabled = 1;
+bool linuxExtEnabled = true;
+bool lookupCacheEnabled = true;
unsigned int global_secflags = CIFSSEC_DEF;
/* unsigned int ntlmv2_support = 0; */
unsigned int sign_CIFS_PDUs = 1;
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -1588,11 +1588,11 @@ GLOBAL_EXTERN atomic_t midCount;
/* Misc globals */
GLOBAL_EXTERN bool enable_oplocks; /* enable or disable oplocks */
-GLOBAL_EXTERN unsigned int lookupCacheEnabled;
+GLOBAL_EXTERN bool lookupCacheEnabled;
GLOBAL_EXTERN unsigned int global_secflags; /* if on, session setup sent
with more secure ntlmssp2 challenge/resp */
GLOBAL_EXTERN unsigned int sign_CIFS_PDUs; /* enable smb packet signing */
-GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
+GLOBAL_EXTERN bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
GLOBAL_EXTERN unsigned int CIFSMaxBufSize; /* max size not including hdr */
GLOBAL_EXTERN unsigned int cifs_min_rcv; /* min size of big ntwrk buf pool */
GLOBAL_EXTERN unsigned int cifs_min_small; /* min size of small buf pool */
--
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