[Qemu-devel] [PULL 0/5] Net patches

[Qemu-devel] [PULL 0/5] Net patches

[Jason Wang]

The following changes since commit fff3159900d2b95613a9cb75fc3703e67a674729:

  Merge remote-tracking branch 'remotes/pmaydell/tags/pull-target-arm-20190726' into staging (2019-07-26 16:23:07 +0100)

are available in the git repository at:

  https://github.com/jasowang/qemu.git tags/net-pull-request

for you to fetch changes up to f77bed14f01557596727c4eea042e9818c242049:

  net/colo-compare.c: Fix memory leak and code style issue. (2019-07-29 16:29:30 +0800)

----------------------------------------------------------------

----------------------------------------------------------------
Jason Wang (1):
      e1000: don't raise interrupt in pre_save()

Prasad J Pandit (3):
      qemu-bridge-helper: restrict interface name to IFNAMSIZ
      qemu-bridge-helper: move repeating code in parse_acl_file
      net: tap: replace snprintf with g_strdup_printf calls

Zhang Chen (1):
      net/colo-compare.c: Fix memory leak and code style issue.

 hw/net/e1000.c       |  8 ++------
 net/colo-compare.c   | 27 ++++++++++++++++++++-------
 net/tap.c            | 19 +++++++++++--------
 qemu-bridge-helper.c | 24 +++++++++++++++++-------
 4 files changed, 50 insertions(+), 28 deletions(-)

[Qemu-devel] [PULL 1/5] e1000: don't raise interrupt in pre_save()

[Jason Wang]

We should not raise any interrupt after VM has been stopped but this
is what e1000 currently did when mit timer is active in
pre_save(). Fixing this by scheduling a timer in post_load() which can
make sure the interrupt was raised when VM is running.

Reported-and-tested-by: Longpeng <longpeng2@huawei.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/net/e1000.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/hw/net/e1000.c b/hw/net/e1000.c
index 1dc1466..a023ceb 100644
--- a/hw/net/e1000.c
+++ b/hw/net/e1000.c
@@ -1381,11 +1381,6 @@ static int e1000_pre_save(void *opaque)
     E1000State *s = opaque;
     NetClientState *nc = qemu_get_queue(s->nic);
 
-    /* If the mitigation timer is active, emulate a timeout now. */
-    if (s->mit_timer_on) {
-        e1000_mit_timer(s);
-    }
-
     /*
      * If link is down and auto-negotiation is supported and ongoing,
      * complete auto-negotiation immediately. This allows us to look
@@ -1423,7 +1418,8 @@ static int e1000_post_load(void *opaque, int version_id)
         s->mit_irq_level = false;
     }
     s->mit_ide = 0;
-    s->mit_timer_on = false;
+    s->mit_timer_on = true;
+    timer_mod(s->mit_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + 1);
 
     /* nc.link_down can't be migrated, so infer link_down according
      * to link status bit in mac_reg[STATUS].
-- 
2.5.0

[Qemu-devel] [PULL 2/5] qemu-bridge-helper: restrict interface name to IFNAMSIZ

[Jason Wang]

From: Prasad J Pandit <pjp@fedoraproject.org>

The network interface name in Linux is defined to be of size
IFNAMSIZ(=16), including the terminating null('\0') byte.
The same is applied to interface names read from 'bridge.conf'
file to form ACL rules. If user supplied '--br=bridge' name
is not restricted to the same length, it could lead to ACL bypass
issue. Restrict interface name to IFNAMSIZ, including null byte.

Reported-by: Riccardo Schirone <rschiron@redhat.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Li Qiang <liq3ea@gmail.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 qemu-bridge-helper.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/qemu-bridge-helper.c b/qemu-bridge-helper.c
index 95624bc..2058e10 100644
--- a/qemu-bridge-helper.c
+++ b/qemu-bridge-helper.c
@@ -119,6 +119,13 @@ static int parse_acl_file(const char *filename, ACLList *acl_list)
         }
         *argend = 0;
 
+        if (!g_str_equal(cmd, "include") && strlen(arg) >= IFNAMSIZ) {
+            fprintf(stderr, "name `%s' too long: %zu\n", arg, strlen(arg));
+            fclose(f);
+            errno = EINVAL;
+            return -1;
+        }
+
         if (strcmp(cmd, "deny") == 0) {
             acl_rule = g_malloc(sizeof(*acl_rule));
             if (strcmp(arg, "all") == 0) {
@@ -269,6 +276,10 @@ int main(int argc, char **argv)
         usage();
         return EXIT_FAILURE;
     }
+    if (strlen(bridge) >= IFNAMSIZ) {
+        fprintf(stderr, "name `%s' too long: %zu\n", bridge, strlen(bridge));
+        return EXIT_FAILURE;
+    }
 
     /* parse default acl file */
     QSIMPLEQ_INIT(&acl_list);
-- 
2.5.0

[Qemu-devel] [PULL 3/5] qemu-bridge-helper: move repeating code in parse_acl_file

[Jason Wang]

From: Prasad J Pandit <pjp@fedoraproject.org>

Move repeating error handling sequence in parse_acl_file routine
to an 'err' label.

Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Li Qiang <liq3ea@gmail.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 qemu-bridge-helper.c | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/qemu-bridge-helper.c b/qemu-bridge-helper.c
index 2058e10..3d50ec0 100644
--- a/qemu-bridge-helper.c
+++ b/qemu-bridge-helper.c
@@ -102,9 +102,7 @@ static int parse_acl_file(const char *filename, ACLList *acl_list)
 
         if (arg == NULL) {
             fprintf(stderr, "Invalid config line:\n  %s\n", line);
-            fclose(f);
-            errno = EINVAL;
-            return -1;
+            goto err;
         }
 
         *arg = 0;
@@ -121,9 +119,7 @@ static int parse_acl_file(const char *filename, ACLList *acl_list)
 
         if (!g_str_equal(cmd, "include") && strlen(arg) >= IFNAMSIZ) {
             fprintf(stderr, "name `%s' too long: %zu\n", arg, strlen(arg));
-            fclose(f);
-            errno = EINVAL;
-            return -1;
+            goto err;
         }
 
         if (strcmp(cmd, "deny") == 0) {
@@ -149,15 +145,18 @@ static int parse_acl_file(const char *filename, ACLList *acl_list)
             parse_acl_file(arg, acl_list);
         } else {
             fprintf(stderr, "Unknown command `%s'\n", cmd);
-            fclose(f);
-            errno = EINVAL;
-            return -1;
+            goto err;
         }
     }
 
     fclose(f);
-
     return 0;
+
+err:
+    fclose(f);
+    errno = EINVAL;
+    return -1;
+
 }
 
 static bool has_vnet_hdr(int fd)
-- 
2.5.0

[Qemu-devel] [PULL 4/5] net: tap: replace snprintf with g_strdup_printf calls

[Jason Wang]

From: Prasad J Pandit <pjp@fedoraproject.org>

When invoking qemu-bridge-helper in 'net_bridge_run_helper',
instead of using fixed sized buffers, use dynamically allocated
ones initialised and returned by g_strdup_printf().

Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Reviewed-by: Li Qiang <liq3ea@gmail.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 net/tap.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/net/tap.c b/net/tap.c
index e8aadd8..fc38029 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -498,9 +498,9 @@ static int net_bridge_run_helper(const char *helper, const char *bridge,
     }
     if (pid == 0) {
         int open_max = sysconf(_SC_OPEN_MAX), i;
-        char fd_buf[6+10];
-        char br_buf[6+IFNAMSIZ] = {0};
-        char helper_cmd[PATH_MAX + sizeof(fd_buf) + sizeof(br_buf) + 15];
+        char *fd_buf = NULL;
+        char *br_buf = NULL;
+        char *helper_cmd = NULL;
 
         for (i = 3; i < open_max; i++) {
             if (i != sv[1]) {
@@ -508,17 +508,17 @@ static int net_bridge_run_helper(const char *helper, const char *bridge,
             }
         }
 
-        snprintf(fd_buf, sizeof(fd_buf), "%s%d", "--fd=", sv[1]);
+        fd_buf = g_strdup_printf("%s%d", "--fd=", sv[1]);
 
         if (strrchr(helper, ' ') || strrchr(helper, '\t')) {
             /* assume helper is a command */
 
             if (strstr(helper, "--br=") == NULL) {
-                snprintf(br_buf, sizeof(br_buf), "%s%s", "--br=", bridge);
+                br_buf = g_strdup_printf("%s%s", "--br=", bridge);
             }
 
-            snprintf(helper_cmd, sizeof(helper_cmd), "%s %s %s %s",
-                     helper, "--use-vnet", fd_buf, br_buf);
+            helper_cmd = g_strdup_printf("%s %s %s %s", helper,
+                            "--use-vnet", fd_buf, br_buf ? br_buf : "");
 
             parg = args;
             *parg++ = (char *)"sh";
@@ -527,10 +527,11 @@ static int net_bridge_run_helper(const char *helper, const char *bridge,
             *parg++ = NULL;
 
             execv("/bin/sh", args);
+            g_free(helper_cmd);
         } else {
             /* assume helper is just the executable path name */
 
-            snprintf(br_buf, sizeof(br_buf), "%s%s", "--br=", bridge);
+            br_buf = g_strdup_printf("%s%s", "--br=", bridge);
 
             parg = args;
             *parg++ = (char *)helper;
@@ -541,6 +542,8 @@ static int net_bridge_run_helper(const char *helper, const char *bridge,
 
             execv(helper, args);
         }
+        g_free(fd_buf);
+        g_free(br_buf);
         _exit(1);
 
     } else {
-- 
2.5.0

[Qemu-devel] [PULL 5/5] net/colo-compare.c: Fix memory leak and code style issue.

[Jason Wang]

From: Zhang Chen <chen.zhang@intel.com>

This patch to fix the origin "char *data" memory leak, code style issue
and add necessary check here.
Reported-by: Coverity (CID 1402785)

Signed-off-by: Zhang Chen <chen.zhang@intel.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 net/colo-compare.c | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/net/colo-compare.c b/net/colo-compare.c
index 909dd6c..7489840 100644
--- a/net/colo-compare.c
+++ b/net/colo-compare.c
@@ -127,6 +127,17 @@ static int compare_chr_send(CompareState *s,
                             uint32_t vnet_hdr_len,
                             bool notify_remote_frame);
 
+static bool packet_matches_str(const char *str,
+                               const uint8_t *buf,
+                               uint32_t packet_len)
+{
+    if (packet_len != strlen(str)) {
+        return false;
+    }
+
+    return !memcmp(str, buf, strlen(str));
+}
+
 static void notify_remote_frame(CompareState *s)
 {
     char msg[] = "DO_CHECKPOINT";
@@ -1008,21 +1019,23 @@ static void compare_notify_rs_finalize(SocketReadState *notify_rs)
 {
     CompareState *s = container_of(notify_rs, CompareState, notify_rs);
 
-    /* Get Xen colo-frame's notify and handle the message */
-    char *data = g_memdup(notify_rs->buf, notify_rs->packet_len);
-    char msg[] = "COLO_COMPARE_GET_XEN_INIT";
+    const char msg[] = "COLO_COMPARE_GET_XEN_INIT";
     int ret;
 
-    if (!strcmp(data, "COLO_USERSPACE_PROXY_INIT")) {
+    if (packet_matches_str("COLO_USERSPACE_PROXY_INIT",
+                           notify_rs->buf,
+                           notify_rs->packet_len)) {
         ret = compare_chr_send(s, (uint8_t *)msg, strlen(msg), 0, true);
         if (ret < 0) {
             error_report("Notify Xen COLO-frame INIT failed");
         }
-    }
-
-    if (!strcmp(data, "COLO_CHECKPOINT")) {
+    } else if (packet_matches_str("COLO_CHECKPOINT",
+                                  notify_rs->buf,
+                                  notify_rs->packet_len)) {
         /* colo-compare do checkpoint, flush pri packet and remove sec packet */
         g_queue_foreach(&s->conn_list, colo_flush_packets, s);
+    } else {
+        error_report("COLO compare got unsupported instruction");
     }
 }
 
-- 
2.5.0

Re: [Qemu-devel] [PULL 0/5] Net patches

[Peter Maydell]

On Mon, 29 Jul 2019 at 09:33, Jason Wang <jasowang@redhat.com> wrote:
>
> The following changes since commit fff3159900d2b95613a9cb75fc3703e67a674729:
>
>   Merge remote-tracking branch 'remotes/pmaydell/tags/pull-target-arm-20190726' into staging (2019-07-26 16:23:07 +0100)
>
> are available in the git repository at:
>
>   https://github.com/jasowang/qemu.git tags/net-pull-request
>
> for you to fetch changes up to f77bed14f01557596727c4eea042e9818c242049:
>
>   net/colo-compare.c: Fix memory leak and code style issue. (2019-07-29 16:29:30 +0800)
>
> ----------------------------------------------------------------
>
> ----------------------------------------------------------------
> Jason Wang (1):
>       e1000: don't raise interrupt in pre_save()
>
> Prasad J Pandit (3):
>       qemu-bridge-helper: restrict interface name to IFNAMSIZ
>       qemu-bridge-helper: move repeating code in parse_acl_file
>       net: tap: replace snprintf with g_strdup_printf calls
>
> Zhang Chen (1):
>       net/colo-compare.c: Fix memory leak and code style issue.


Applied, thanks.

Please update the changelog at https://wiki.qemu.org/ChangeLog/4.1
for any user-visible changes.

-- PMM

Re: [Qemu-devel] [PULL 0/5] Net patches

[Jason Wang]

On 2019/7/29 下午7:47, Peter Maydell wrote:
> On Mon, 29 Jul 2019 at 09:33, Jason Wang <jasowang@redhat.com> wrote:
>> The following changes since commit fff3159900d2b95613a9cb75fc3703e67a674729:
>>
>>    Merge remote-tracking branch 'remotes/pmaydell/tags/pull-target-arm-20190726' into staging (2019-07-26 16:23:07 +0100)
>>
>> are available in the git repository at:
>>
>>    https://github.com/jasowang/qemu.git tags/net-pull-request
>>
>> for you to fetch changes up to f77bed14f01557596727c4eea042e9818c242049:
>>
>>    net/colo-compare.c: Fix memory leak and code style issue. (2019-07-29 16:29:30 +0800)
>>
>> ----------------------------------------------------------------
>>
>> ----------------------------------------------------------------
>> Jason Wang (1):
>>        e1000: don't raise interrupt in pre_save()
>>
>> Prasad J Pandit (3):
>>        qemu-bridge-helper: restrict interface name to IFNAMSIZ
>>        qemu-bridge-helper: move repeating code in parse_acl_file
>>        net: tap: replace snprintf with g_strdup_printf calls
>>
>> Zhang Chen (1):
>>        net/colo-compare.c: Fix memory leak and code style issue.
>
> Applied, thanks.
>
> Please update the changelog at https://wiki.qemu.org/ChangeLog/4.1
> for any user-visible changes.
>
> -- PMM


Thanks for the reminding.

There's no user-visible changes.