* [PATCH] cifs: fix possible uninitialized access and race on iface_list
@ 2019-12-04 13:38 Aurelien Aptel
2019-12-04 15:14 ` [PATCH v2] " Aurelien Aptel
0 siblings, 1 reply; 3+ messages in thread
From: Aurelien Aptel @ 2019-12-04 13:38 UTC (permalink / raw)
To: linux-cifs; +Cc: smfrench, Aurelien Aptel
iface[0] was accessed regardless of the count value and without
locking.
* check count before accessing any ifaces
* make copy of iface list (it's a simple POD array) and use it without
locking.
Signed-off-by: Aurelien Aptel <aaptel@suse.com>
---
fs/cifs/sess.c | 30 +++++++++++++++++++++++++++---
1 file changed, 27 insertions(+), 3 deletions(-)
diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
index fb3bdc44775c..6a58f8a477a2 100644
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -77,6 +77,8 @@ int cifs_try_adding_channels(struct cifs_ses *ses)
int i = 0;
int rc = 0;
int tries = 0;
+ struct cifs_server_iface *ifaces = NULL;
+ size_t iface_count;
if (left <= 0) {
cifs_dbg(FYI,
@@ -90,6 +92,27 @@ int cifs_try_adding_channels(struct cifs_ses *ses)
return 0;
}
+ /*
+ * Make a copy of the iface list at the time and use that
+ * instead so as to not hold the iface spinlock for opening
+ * channels
+ */
+ spin_lock(&ses->iface_lock);
+ iface_count = ses->iface_count;
+ if (iface_count <= 0) {
+ spin_unlock(&ses->iface_lock);
+ cifs_dbg(FYI, "no iface list available to open channels\n");
+ return 0;
+ }
+ ifaces = kmemdup(ses->iface_list, iface_count*sizeof(*ifaces),
+ GFP_ATOMIC);
+ if (!ifaces) {
+ spin_unlock(&ses->iface_lock);
+ kfree(ifaces);
+ return 0;
+ }
+ spin_unlock(&ses->iface_lock);
+
/*
* Keep connecting to same, fastest, iface for all channels as
* long as its RSS. Try next fastest one if not RSS or channel
@@ -105,9 +128,9 @@ int cifs_try_adding_channels(struct cifs_ses *ses)
break;
}
- iface = &ses->iface_list[i];
+ iface = &ifaces[i];
if (is_ses_using_iface(ses, iface) && !iface->rss_capable) {
- i = (i+1) % ses->iface_count;
+ i = (i+1) % iface_count;
continue;
}
@@ -115,7 +138,7 @@ int cifs_try_adding_channels(struct cifs_ses *ses)
if (rc) {
cifs_dbg(FYI, "failed to open extra channel on iface#%d rc=%d\n",
i, rc);
- i = (i+1) % ses->iface_count;
+ i = (i+1) % iface_count;
continue;
}
@@ -124,6 +147,7 @@ int cifs_try_adding_channels(struct cifs_ses *ses)
left--;
}
+ kfree(ifaces);
return ses->chan_count - old_chan_count;
}
--
2.16.4
^ permalink raw reply related [flat|nested] 3+ messages in thread* [PATCH v2] cifs: fix possible uninitialized access and race on iface_list
2019-12-04 13:38 [PATCH] cifs: fix possible uninitialized access and race on iface_list Aurelien Aptel
@ 2019-12-04 15:14 ` Aurelien Aptel
[not found] ` <7FD5F9C5-58B0-40D5-A5AD-13CCD75E625E@pretty.Easy.privacy>
0 siblings, 1 reply; 3+ messages in thread
From: Aurelien Aptel @ 2019-12-04 15:14 UTC (permalink / raw)
To: linux-cifs; +Cc: smfrench, Aurelien Aptel
iface[0] was accessed regardless of the count value and without
locking.
* check count before accessing any ifaces
* make copy of iface list (it's a simple POD array) and use it without
locking.
Signed-off-by: Aurelien Aptel <aaptel@suse.com>
---
changes since v1:
* remove unecessary kfree()
fs/cifs/sess.c | 29 ++++++++++++++++++++++++++---
1 file changed, 26 insertions(+), 3 deletions(-)
diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
index fb3bdc44775c..396400cf2800 100644
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -77,6 +77,8 @@ int cifs_try_adding_channels(struct cifs_ses *ses)
int i = 0;
int rc = 0;
int tries = 0;
+ struct cifs_server_iface *ifaces = NULL;
+ size_t iface_count;
if (left <= 0) {
cifs_dbg(FYI,
@@ -90,6 +92,26 @@ int cifs_try_adding_channels(struct cifs_ses *ses)
return 0;
}
+ /*
+ * Make a copy of the iface list at the time and use that
+ * instead so as to not hold the iface spinlock for opening
+ * channels
+ */
+ spin_lock(&ses->iface_lock);
+ iface_count = ses->iface_count;
+ if (iface_count <= 0) {
+ spin_unlock(&ses->iface_lock);
+ cifs_dbg(FYI, "no iface list available to open channels\n");
+ return 0;
+ }
+ ifaces = kmemdup(ses->iface_list, iface_count*sizeof(*ifaces),
+ GFP_ATOMIC);
+ if (!ifaces) {
+ spin_unlock(&ses->iface_lock);
+ return 0;
+ }
+ spin_unlock(&ses->iface_lock);
+
/*
* Keep connecting to same, fastest, iface for all channels as
* long as its RSS. Try next fastest one if not RSS or channel
@@ -105,9 +127,9 @@ int cifs_try_adding_channels(struct cifs_ses *ses)
break;
}
- iface = &ses->iface_list[i];
+ iface = &ifaces[i];
if (is_ses_using_iface(ses, iface) && !iface->rss_capable) {
- i = (i+1) % ses->iface_count;
+ i = (i+1) % iface_count;
continue;
}
@@ -115,7 +137,7 @@ int cifs_try_adding_channels(struct cifs_ses *ses)
if (rc) {
cifs_dbg(FYI, "failed to open extra channel on iface#%d rc=%d\n",
i, rc);
- i = (i+1) % ses->iface_count;
+ i = (i+1) % iface_count;
continue;
}
@@ -124,6 +146,7 @@ int cifs_try_adding_channels(struct cifs_ses *ses)
left--;
}
+ kfree(ifaces);
return ses->chan_count - old_chan_count;
}
--
2.16.4
^ permalink raw reply related [flat|nested] 3+ messages in thread
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2019-12-04 13:38 [PATCH] cifs: fix possible uninitialized access and race on iface_list Aurelien Aptel
2019-12-04 15:14 ` [PATCH v2] " Aurelien Aptel
[not found] ` <7FD5F9C5-58B0-40D5-A5AD-13CCD75E625E@pretty.Easy.privacy>
2019-12-04 17:55 ` Steve French
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