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authorKees Cook <keescook@chromium.org>2013-05-23 10:32:17 -0700
committerNicholas Bellinger <nab@linux-iscsi.org>2013-05-30 18:07:54 -0700
commitcea4dcfdad926a27a18e188720efe0f2c9403456 (patch)
tree7ae6fd132bbd1e7cd888dcaae6946cecfd20a2e1 /drivers/target
parent21363ca873334391992f2f424856aa864345bb61 (diff)
downloadlinux-linaro-stable-cea4dcfdad926a27a18e188720efe0f2c9403456.tar.gz
iscsi-target: fix heap buffer overflow on error
If a key was larger than 64 bytes, as checked by iscsi_check_key(), the error response packet, generated by iscsi_add_notunderstood_response(), would still attempt to copy the entire key into the packet, overflowing the structure on the heap. Remote preauthentication kernel memory corruption was possible if a target was configured and listening on the network. CVE-2013-2850 Signed-off-by: Kees Cook <keescook@chromium.org> Cc: stable@vger.kernel.org Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target')
-rw-r--r--drivers/target/iscsi/iscsi_target_parameters.c8
-rw-r--r--drivers/target/iscsi/iscsi_target_parameters.h4
2 files changed, 6 insertions, 6 deletions
diff --git a/drivers/target/iscsi/iscsi_target_parameters.c b/drivers/target/iscsi/iscsi_target_parameters.c
index c2185fc31136..e38222191a33 100644
--- a/drivers/target/iscsi/iscsi_target_parameters.c
+++ b/drivers/target/iscsi/iscsi_target_parameters.c
@@ -758,9 +758,9 @@ static int iscsi_add_notunderstood_response(
}
INIT_LIST_HEAD(&extra_response->er_list);
- strncpy(extra_response->key, key, strlen(key) + 1);
- strncpy(extra_response->value, NOTUNDERSTOOD,
- strlen(NOTUNDERSTOOD) + 1);
+ strlcpy(extra_response->key, key, sizeof(extra_response->key));
+ strlcpy(extra_response->value, NOTUNDERSTOOD,
+ sizeof(extra_response->value));
list_add_tail(&extra_response->er_list,
&param_list->extra_response_list);
@@ -1629,8 +1629,6 @@ int iscsi_decode_text_input(
if (phase & PHASE_SECURITY) {
if (iscsi_check_for_auth_key(key) > 0) {
- char *tmpptr = key + strlen(key);
- *tmpptr = '=';
kfree(tmpbuf);
return 1;
}
diff --git a/drivers/target/iscsi/iscsi_target_parameters.h b/drivers/target/iscsi/iscsi_target_parameters.h
index 915b06798505..a47046a752aa 100644
--- a/drivers/target/iscsi/iscsi_target_parameters.h
+++ b/drivers/target/iscsi/iscsi_target_parameters.h
@@ -1,8 +1,10 @@
#ifndef ISCSI_PARAMETERS_H
#define ISCSI_PARAMETERS_H
+#include <scsi/iscsi_proto.h>
+
struct iscsi_extra_response {
- char key[64];
+ char key[KEY_MAXLEN];
char value[32];
struct list_head er_list;
} ____cacheline_aligned;