28 files changed, 277 insertions, 75 deletions

diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index 30266786d..54b19f86d 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -513,7 +513,11 @@ int qcow2_update_snapshot_refcount(BlockDriverState *bs,
     l1_size2 = l1_size * sizeof(uint64_t);
     l1_allocated = 0;
     if (l1_table_offset != s->l1_table_offset) {
-        l1_table = qemu_mallocz(align_offset(l1_size2, 512));
+        if (l1_size2 != 0) {
+            l1_table = qemu_mallocz(align_offset(l1_size2, 512));
+        } else {
+            l1_table = NULL;
+        }
         l1_allocated = 1;
         if (bdrv_pread(s->hd, l1_table_offset,
                        l1_table, l1_size2) != l1_size2)
@@ -769,12 +773,16 @@ static int check_refcounts_l1(BlockDriverState *bs,
                   l1_table_offset, l1_size2);
 
     /* Read L1 table entries from disk */
-    l1_table = qemu_malloc(l1_size2);
-    if (bdrv_pread(s->hd, l1_table_offset,
-                   l1_table, l1_size2) != l1_size2)
-        goto fail;
-    for(i = 0;i < l1_size; i++)
-        be64_to_cpus(&l1_table[i]);
+    if (l1_size2 == 0) {
+        l1_table = NULL;
+    } else {
+        l1_table = qemu_malloc(l1_size2);
+        if (bdrv_pread(s->hd, l1_table_offset,
+                       l1_table, l1_size2) != l1_size2)
+            goto fail;
+        for(i = 0;i < l1_size; i++)
+            be64_to_cpus(&l1_table[i]);
+    }
 
     /* Do the actual checks */
     for(i = 0; i < l1_size; i++) {
diff --git a/block/qcow2-snapshot.c b/block/qcow2-snapshot.c
index 94cb83806..d63c7e17d 100644
--- a/block/qcow2-snapshot.c
+++ b/block/qcow2-snapshot.c
@@ -266,7 +266,12 @@ int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
     sn->l1_table_offset = qcow2_alloc_clusters(bs, s->l1_size * sizeof(uint64_t));
     sn->l1_size = s->l1_size;
 
-    l1_table = qemu_malloc(s->l1_size * sizeof(uint64_t));
+    if (s->l1_size != 0) {
+        l1_table = qemu_malloc(s->l1_size * sizeof(uint64_t));
+    } else {
+        l1_table = NULL;
+    }
+
     for(i = 0; i < s->l1_size; i++) {
         l1_table[i] = cpu_to_be64(s->l1_table[i]);
     }
diff --git a/block/qcow2.c b/block/qcow2.c
index 3954cf139..984264b3e 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -124,12 +124,12 @@ static int qcow_read_extensions(BlockDriverState *bs, uint64_t start_offset,
 #ifdef DEBUG_EXT
             printf("Qcow2: Got format extension %s\n", bs->backing_format);
 #endif
-            offset += ((ext.len + 7) & ~7);
+            offset = ((offset + ext.len + 7) & ~7);
             break;
 
         default:
             /* unknown magic -- just skip it */
-            offset += ((ext.len + 7) & ~7);
+            offset = ((offset + ext.len + 7) & ~7);
             break;
         }
     }
@@ -738,6 +738,7 @@ static int qcow_create2(const char *filename, int64_t total_size,
 
     int fd, header_size, backing_filename_len, l1_size, i, shift, l2_bits;
     int ref_clusters, backing_format_len = 0;
+    int rounded_ext_bf_len = 0;
     QCowHeader header;
     uint64_t tmp, offset;
     QCowCreateState s1, *s = &s1;
@@ -759,8 +760,9 @@ static int qcow_create2(const char *filename, int64_t total_size,
         if (backing_format) {
             ext_bf.magic = QCOW_EXT_MAGIC_BACKING_FORMAT;
             backing_format_len = strlen(backing_format);
-            ext_bf.len = (backing_format_len + 7) & ~7;
-            header_size += ((sizeof(ext_bf) + ext_bf.len + 7) & ~7);
+            ext_bf.len = backing_format_len;
+            rounded_ext_bf_len = (sizeof(ext_bf) + ext_bf.len + 7) & ~7;
+            header_size += rounded_ext_bf_len;
         }
         header.backing_file_offset = cpu_to_be64(header_size);
         backing_filename_len = strlen(backing_file);
@@ -828,15 +830,15 @@ static int qcow_create2(const char *filename, int64_t total_size,
     if (backing_file) {
         if (backing_format_len) {
             char zero[16];
-            int d = ext_bf.len - backing_format_len;
+            int padding = rounded_ext_bf_len - (ext_bf.len + sizeof(ext_bf));
 
             memset(zero, 0, sizeof(zero));
             cpu_to_be32s(&ext_bf.magic);
             cpu_to_be32s(&ext_bf.len);
             write(fd, &ext_bf, sizeof(ext_bf));
             write(fd, backing_format, backing_format_len);
-            if (d>0) {
-                write(fd, zero, d);
+            if (padding > 0) {
+                write(fd, zero, padding);
             }
         }
         write(fd, backing_file, backing_filename_len);
diff --git a/block/raw-posix.c b/block/raw-posix.c
index 7446ca931..6dcc65189 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -155,7 +155,7 @@ static int raw_open_common(BlockDriverState *bs, const char *filename,
         s->open_flags |= O_DSYNC;
 
     s->fd = -1;
-    fd = open(filename, s->open_flags, 0644);
+    fd = qemu_open(filename, s->open_flags, 0644);
     if (fd < 0) {
         ret = -errno;
         if (ret == -EROFS)
@@ -1016,6 +1016,7 @@ static BlockDriver bdrv_host_device = {
     .bdrv_close         = raw_close,
     .bdrv_create        = hdev_create,
     .create_options     = raw_create_options,
+    .no_zero_init       = 1,
     .bdrv_flush         = raw_flush,
 
     .bdrv_aio_readv	= raw_aio_readv,
@@ -1112,6 +1113,7 @@ static BlockDriver bdrv_host_floppy = {
     .bdrv_close         = raw_close,
     .bdrv_create        = hdev_create,
     .create_options     = raw_create_options,
+    .no_zero_init       = 1,
     .bdrv_flush         = raw_flush,
 
     .bdrv_aio_readv     = raw_aio_readv,
@@ -1194,6 +1196,7 @@ static BlockDriver bdrv_host_cdrom = {
     .bdrv_close         = raw_close,
     .bdrv_create        = hdev_create,
     .create_options     = raw_create_options,
+    .no_zero_init       = 1,
     .bdrv_flush         = raw_flush,
 
     .bdrv_aio_readv     = raw_aio_readv,
@@ -1315,6 +1318,7 @@ static BlockDriver bdrv_host_cdrom = {
     .bdrv_close         = raw_close,
     .bdrv_create        = hdev_create,
     .create_options     = raw_create_options,
+    .no_zero_init       = 1,
     .bdrv_flush         = raw_flush,
 
     .bdrv_aio_readv     = raw_aio_readv,
diff --git a/block_int.h b/block_int.h
index 907e86410..9a3b2e09d 100644
--- a/block_int.h
+++ b/block_int.h
@@ -117,6 +117,9 @@ struct BlockDriver {
     /* Returns number of errors in image, -errno for internal errors */
     int (*bdrv_check)(BlockDriverState* bs);
 
+    /* Set if newly created images are not guaranteed to contain only zeros */
+    int no_zero_init;
+
     struct BlockDriver *next;
 };
 
diff --git a/compatfd.c b/compatfd.c
index 594e4af8a..e87bb9e71 100644
--- a/compatfd.c
+++ b/compatfd.c
@@ -85,6 +85,9 @@ static int qemu_signalfd_compat(const sigset_t *mask)
         return -1;
     }
 
+    qemu_set_cloexec(fds[0]);
+    qemu_set_cloexec(fds[1]);
+
     memcpy(&info->mask, mask, sizeof(*mask));
     info->fd = fds[1];
 
@@ -104,8 +107,10 @@ int qemu_signalfd(const sigset_t *mask)
     int ret;
 
     ret = syscall(SYS_signalfd, -1, mask, _NSIG / 8);
-    if (ret != -1)
+    if (ret != -1) {
+        qemu_set_cloexec(ret);
         return ret;
+    }
 #endif
 
     return qemu_signalfd_compat(mask);
@@ -119,13 +124,20 @@ int qemu_eventfd(int *fds)
     ret = syscall(SYS_eventfd, 0);
     if (ret >= 0) {
         fds[0] = ret;
+        qemu_set_cloexec(ret);
         if ((fds[1] = dup(ret)) == -1) {
             close(ret);
             return -1;
         }
+        qemu_set_cloexec(fds[1]);
         return 0;
     }
 #endif
 
-    return pipe(fds);
+    ret = pipe(fds);
+    if (ret != -1) {
+        qemu_set_cloexec(fds[0]);
+        qemu_set_cloexec(fds[1]);
+    }
+    return ret;
 }
diff --git a/configure b/configure
index d5f53f8b7..cc01192ac 100755
--- a/configure
+++ b/configure
@@ -1693,6 +1693,23 @@ if compile_prog "" "" ; then
   pipe2=yes
 fi
 
+# check if accept4 is there
+accept4=no
+cat > $TMPC << EOF
+#define _GNU_SOURCE
+#include <sys/socket.h>
+#include <stddef.h>
+
+int main(void)
+{
+    accept4(0, NULL, NULL, SOCK_CLOEXEC);
+    return 0;
+}
+EOF
+if compile_prog "" "" ; then
+  accept4=yes
+fi
+
 # check if tee/splice is there. vmsplice was added same time.
 splice=no
 cat > $TMPC << EOF
@@ -2170,6 +2187,9 @@ fi
 if test "$pipe2" = "yes" ; then
   echo "CONFIG_PIPE2=y" >> $config_host_mak
 fi
+if test "$accept4" = "yes" ; then
+  echo "CONFIG_ACCEPT4=y" >> $config_host_mak
+fi
 if test "$splice" = "yes" ; then
   echo "CONFIG_SPLICE=y" >> $config_host_mak
 fi
diff --git a/gdbstub.c b/gdbstub.c
index ad7cdca85..b1c55d8a4 100644
--- a/gdbstub.c
+++ b/gdbstub.c
@@ -2357,6 +2357,9 @@ static void gdb_accept(void)
             perror("accept");
             return;
         } else if (fd >= 0) {
+#ifndef _WIN32
+            fcntl(fd, F_SETFD, FD_CLOEXEC);
+#endif
             break;
         }
     }
@@ -2386,6 +2389,9 @@ static int gdbserver_open(int port)
         perror("socket");
         return -1;
     }
+#ifndef _WIN32
+    fcntl(fd, F_SETFD, FD_CLOEXEC);
+#endif
 
     /* allow fast reuse */
     val = 1;
diff --git a/hw/ide/core.c b/hw/ide/core.c
index 49bbdcde1..a5b00ae0d 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -61,8 +61,9 @@ static inline int media_is_cd(IDEState *s)
 }
 
 static void ide_dma_start(IDEState *s, BlockDriverCompletionFunc *dma_cb);
-static void ide_dma_restart(IDEState *s);
+static void ide_dma_restart(IDEState *s, int is_read);
 static void ide_atapi_cmd_read_dma_cb(void *opaque, int ret);
+static int ide_handle_rw_error(IDEState *s, int error, int op);
 
 static void padstr(char *str, const char *src, int len)
 {
@@ -407,8 +408,11 @@ static void ide_sector_read(IDEState *s)
             n = s->req_nb_sectors;
         ret = bdrv_read(s->bs, sector_num, s->io_buffer, n);
         if (ret != 0) {
-            ide_rw_error(s);
-            return;
+            if (ide_handle_rw_error(s, -ret,
+                BM_STATUS_PIO_RETRY | BM_STATUS_RETRY_READ))
+            {
+                return;
+            }
         }
         ide_transfer_start(s, s->io_buffer, 512 * n, ide_sector_read);
         ide_set_irq(s->bus);
@@ -471,9 +475,10 @@ void ide_dma_error(IDEState *s)
     ide_set_irq(s->bus);
 }
 
-static int ide_handle_write_error(IDEState *s, int error, int op)
+static int ide_handle_rw_error(IDEState *s, int error, int op)
 {
-    BlockInterfaceErrorAction action = drive_get_on_error(s->bs, 0);
+    int is_read = (op & BM_STATUS_RETRY_READ);
+    BlockInterfaceErrorAction action = drive_get_on_error(s->bs, is_read);
 
     if (action == BLOCK_ERR_IGNORE)
         return 0;
@@ -484,7 +489,7 @@ static int ide_handle_write_error(IDEState *s, int error, int op)
         s->bus->bmdma->status |= op;
         vm_stop(0);
     } else {
-        if (op == BM_STATUS_DMA_RETRY) {
+        if (op & BM_STATUS_DMA_RETRY) {
             dma_buf_commit(s, 0);
             ide_dma_error(s);
         } else {
@@ -551,9 +556,11 @@ static void ide_read_dma_cb(void *opaque, int ret)
     int64_t sector_num;
 
     if (ret < 0) {
-        dma_buf_commit(s, 1);
-	ide_dma_error(s);
-	return;
+        if (ide_handle_rw_error(s, -ret,
+            BM_STATUS_DMA_RETRY | BM_STATUS_RETRY_READ))
+        {
+            return;
+        }
     }
 
     n = s->io_buffer_size >> 9;
@@ -622,7 +629,7 @@ static void ide_sector_write(IDEState *s)
     ret = bdrv_write(s->bs, sector_num, s->io_buffer, n);
 
     if (ret != 0) {
-        if (ide_handle_write_error(s, -ret, BM_STATUS_PIO_RETRY))
+        if (ide_handle_rw_error(s, -ret, BM_STATUS_PIO_RETRY))
             return;
     }
 
@@ -658,16 +665,23 @@ static void ide_sector_write(IDEState *s)
 static void ide_dma_restart_bh(void *opaque)
 {
     BMDMAState *bm = opaque;
+    int is_read;
 
     qemu_bh_delete(bm->bh);
     bm->bh = NULL;
 
+    is_read = !!(bm->status & BM_STATUS_RETRY_READ);
+
     if (bm->status & BM_STATUS_DMA_RETRY) {
-        bm->status &= ~BM_STATUS_DMA_RETRY;
-        ide_dma_restart(bmdma_active_if(bm));
+        bm->status &= ~(BM_STATUS_DMA_RETRY | BM_STATUS_RETRY_READ);
+        ide_dma_restart(bmdma_active_if(bm), is_read);
     } else if (bm->status & BM_STATUS_PIO_RETRY) {
-        bm->status &= ~BM_STATUS_PIO_RETRY;
-        ide_sector_write(bmdma_active_if(bm));
+        bm->status &= ~(BM_STATUS_PIO_RETRY | BM_STATUS_RETRY_READ);
+        if (is_read) {
+            ide_sector_read(bmdma_active_if(bm));
+        } else {
+            ide_sector_write(bmdma_active_if(bm));
+        }
     }
 }
 
@@ -692,7 +706,7 @@ static void ide_write_dma_cb(void *opaque, int ret)
     int64_t sector_num;
 
     if (ret < 0) {
-        if (ide_handle_write_error(s, -ret,  BM_STATUS_DMA_RETRY))
+        if (ide_handle_rw_error(s, -ret,  BM_STATUS_DMA_RETRY))
             return;
     }
 
@@ -2715,7 +2729,7 @@ static void ide_dma_start(IDEState *s, BlockDriverCompletionFunc *dma_cb)
     }
 }
 
-static void ide_dma_restart(IDEState *s)
+static void ide_dma_restart(IDEState *s, int is_read)
 {
     BMDMAState *bm = s->bus->bmdma;
     ide_set_sector(s, bm->sector_num);
@@ -2723,7 +2737,13 @@ static void ide_dma_restart(IDEState *s)
     s->io_buffer_size = 0;
     s->nsector = bm->nsector;
     bm->cur_addr = bm->addr;
-    bm->dma_cb = ide_write_dma_cb;
+
+    if (is_read) {
+        bm->dma_cb = ide_read_dma_cb;
+    } else {
+        bm->dma_cb = ide_write_dma_cb;
+    }
+
     ide_dma_start(s, bm->dma_cb);
 }
 
diff --git a/hw/ide/internal.h b/hw/ide/internal.h
index 567616e13..f937daacf 100644
--- a/hw/ide/internal.h
+++ b/hw/ide/internal.h
@@ -464,6 +464,7 @@ struct IDEDeviceInfo {
 #define BM_STATUS_INT    0x04
 #define BM_STATUS_DMA_RETRY  0x08
 #define BM_STATUS_PIO_RETRY  0x10
+#define BM_STATUS_RETRY_READ 0x20
 
 #define BM_CMD_START     0x01
 #define BM_CMD_READ      0x08
diff --git a/hw/virtio-blk.c b/hw/virtio-blk.c
index a93d20dfa..a2f063974 100644
--- a/hw/virtio-blk.c
+++ b/hw/virtio-blk.c
@@ -98,9 +98,11 @@ static void virtio_blk_req_complete(VirtIOBlockReq *req, int status)
     qemu_free(req);
 }
 
-static int virtio_blk_handle_write_error(VirtIOBlockReq *req, int error)
+static int virtio_blk_handle_rw_error(VirtIOBlockReq *req, int error,
+    int is_read)
 {
-    BlockInterfaceErrorAction action = drive_get_on_error(req->dev->bs, 0);
+    BlockInterfaceErrorAction action =
+        drive_get_on_error(req->dev->bs, is_read);
     VirtIOBlock *s = req->dev;
 
     if (action == BLOCK_ERR_IGNORE)
@@ -122,12 +124,13 @@ static void virtio_blk_rw_complete(void *opaque, int ret)
 {
     VirtIOBlockReq *req = opaque;
 
-    if (ret && (req->out->type & VIRTIO_BLK_T_OUT)) {
-        if (virtio_blk_handle_write_error(req, -ret))
+    if (ret) {
+        int is_read = !(req->out->type & VIRTIO_BLK_T_OUT);
+        if (virtio_blk_handle_rw_error(req, -ret, is_read))
             return;
     }
 
-    virtio_blk_req_complete(req, ret ? VIRTIO_BLK_S_IOERR : VIRTIO_BLK_S_OK);
+    virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
 }
 
 static void virtio_blk_flush_complete(void *opaque, int ret)
diff --git a/kvm-all.c b/kvm-all.c
index 8de370a58..91db3bc16 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -420,7 +420,7 @@ int kvm_init(int smp_cpus)
         s->slots[i].slot = i;
 
     s->vmfd = -1;
-    s->fd = open("/dev/kvm", O_RDWR);
+    s->fd = qemu_open("/dev/kvm", O_RDWR);
     if (s->fd == -1) {
         fprintf(stderr, "Could not access KVM kernel module: %m\n");
         ret = -errno;
diff --git a/migration-tcp.c b/migration-tcp.c
index b77ed8762..2cfa8cba5 100644
--- a/migration-tcp.c
+++ b/migration-tcp.c
@@ -105,7 +105,7 @@ MigrationState *tcp_start_outgoing_migration(Monitor *mon,
     s->state = MIG_STATE_ACTIVE;
     s->mon = NULL;
     s->bandwidth_limit = bandwidth_limit;
-    s->fd = socket(PF_INET, SOCK_STREAM, 0);
+    s->fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
     if (s->fd == -1) {
         qemu_free(s);
         return NULL;
@@ -146,7 +146,7 @@ static void tcp_accept_incoming_migration(void *opaque)
     int c, ret;
 
     do {
-        c = accept(s, (struct sockaddr *)&addr, &addrlen);
+        c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen);
     } while (c == -1 && socket_error() == EINTR);
 
     dprintf("accepted migration\n");
@@ -193,7 +193,7 @@ int tcp_start_incoming_migration(const char *host_port)
         return -EINVAL;
     }
 
-    s = socket(PF_INET, SOCK_STREAM, 0);
+    s = qemu_socket(PF_INET, SOCK_STREAM, 0);
     if (s == -1)
         return -socket_error();
 
diff --git a/migration-unix.c b/migration-unix.c
index 7dd787cd9..783228b3b 100644
--- a/migration-unix.c
+++ b/migration-unix.c
@@ -104,7 +104,7 @@ MigrationState *unix_start_outgoing_migration(Monitor *mon,
     s->state = MIG_STATE_ACTIVE;
     s->mon = NULL;
     s->bandwidth_limit = bandwidth_limit;
-    s->fd = socket(PF_UNIX, SOCK_STREAM, 0);
+    s->fd = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
     if (s->fd < 0) {
         dprintf("Unable to open socket");
         goto err_after_alloc;
@@ -150,7 +150,7 @@ static void unix_accept_incoming_migration(void *opaque)
     int c, ret;
 
     do {
-        c = accept(s, (struct sockaddr *)&addr, &addrlen);
+        c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen);
     } while (c == -1 && socket_error() == EINTR);
 
     dprintf("accepted migration\n");
@@ -191,7 +191,7 @@ int unix_start_incoming_migration(const char *path)
 
     dprintf("Attempting to start an incoming migration\n");
 
-    sock = socket(PF_UNIX, SOCK_STREAM, 0);
+    sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
     if (sock < 0) {
         fprintf(stderr, "Could not open unix socket: %s\n", strerror(errno));
         return -EINVAL;
diff --git a/net/socket.c b/net/socket.c
index 7331d87c6..5533737e4 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -161,7 +161,7 @@ static int net_socket_mcast_create(struct sockaddr_in *mcastaddr)
 	return -1;
 
     }
-    fd = socket(PF_INET, SOCK_DGRAM, 0);
+    fd = qemu_socket(PF_INET, SOCK_DGRAM, 0);
     if (fd < 0) {
         perror("socket(PF_INET, SOCK_DGRAM)");
         return -1;
@@ -355,7 +355,7 @@ static void net_socket_accept(void *opaque)
 
     for(;;) {
         len = sizeof(saddr);
-        fd = accept(s->fd, (struct sockaddr *)&saddr, &len);
+        fd = qemu_accept(s->fd, (struct sockaddr *)&saddr, &len);
         if (fd < 0 && errno != EINTR) {
             return;
         } else if (fd >= 0) {
@@ -386,7 +386,7 @@ static int net_socket_listen_init(VLANState *vlan,
 
     s = qemu_mallocz(sizeof(NetSocketListenState));
 
-    fd = socket(PF_INET, SOCK_STREAM, 0);
+    fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
     if (fd < 0) {
         perror("socket");
         return -1;
@@ -427,7 +427,7 @@ static int net_socket_connect_init(VLANState *vlan,
     if (parse_host_port(&saddr, host_str) < 0)
         return -1;
 
-    fd = socket(PF_INET, SOCK_STREAM, 0);
+    fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
     if (fd < 0) {
         perror("socket");
         return -1;
diff --git a/osdep.c b/osdep.c
index 5747ce547..0706fcd4e 100644
--- a/osdep.c
+++ b/osdep.c
@@ -125,7 +125,7 @@ int qemu_create_pidfile(const char *filename)
 #ifndef _WIN32
     int fd;
 
-    fd = open(filename, O_RDWR | O_CREAT, 0600);
+    fd = qemu_open(filename, O_RDWR | O_CREAT, 0600);
     if (fd == -1)
         return -1;
 
@@ -205,11 +205,113 @@ int inet_aton(const char *cp, struct in_addr *ia)
     ia->s_addr = addr;
     return 1;
 }
+
+void qemu_set_cloexec(int fd)
+{
+}
+
 #else
+
 void socket_set_nonblock(int fd)
 {
     int f;
     f = fcntl(fd, F_GETFL);
     fcntl(fd, F_SETFL, f | O_NONBLOCK);
 }
+
+void qemu_set_cloexec(int fd)
+{
+    int f;
+    f = fcntl(fd, F_GETFD);
+    fcntl(fd, F_SETFD, f | FD_CLOEXEC);
+}
+
+#endif
+
+/*
+ * Opens a file with FD_CLOEXEC set
+ */
+int qemu_open(const char *name, int flags, ...)
+{
+    int ret;
+    int mode = 0;
+
+    if (flags & O_CREAT) {
+        va_list ap;
+
+        va_start(ap, flags);
+        mode = va_arg(ap, int);
+        va_end(ap);
+    }
+
+#ifdef O_CLOEXEC
+    ret = open(name, flags | O_CLOEXEC, mode);
+#else
+    ret = open(name, flags, mode);
+    if (ret >= 0) {
+        qemu_set_cloexec(ret);
+    }
 #endif
+
+    return ret;
+}
+
+#ifndef _WIN32
+/*
+ * Creates a pipe with FD_CLOEXEC set on both file descriptors
+ */
+int qemu_pipe(int pipefd[2])
+{
+    int ret;
+
+#ifdef CONFIG_PIPE2
+    ret = pipe2(pipefd, O_CLOEXEC);
+#else
+    ret = pipe(pipefd);
+    if (ret == 0) {
+        qemu_set_cloexec(pipefd[0]);
+        qemu_set_cloexec(pipefd[1]);
+    }
+#endif
+
+    return ret;
+}
+#endif
+
+/*
+ * Opens a socket with FD_CLOEXEC set
+ */
+int qemu_socket(int domain, int type, int protocol)
+{
+    int ret;
+
+#ifdef SOCK_CLOEXEC
+    ret = socket(domain, type | SOCK_CLOEXEC, protocol);
+#else
+    ret = socket(domain, type, protocol);
+    if (ret >= 0) {
+        qemu_set_cloexec(ret);
+    }
+#endif
+
+    return ret;
+}
+
+/*
+ * Accept a connection and set FD_CLOEXEC
+ */
+int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
+{
+    int ret;
+
+#ifdef CONFIG_ACCEPT4
+    ret = accept4(s, addr, addrlen, SOCK_CLOEXEC);
+#else
+    ret = accept(s, addr, addrlen);
+    if (ret >= 0) {
+        qemu_set_cloexec(ret);
+    }
+#endif
+
+    return ret;
+}
diff --git a/qemu-char.c b/qemu-char.c
index e202585fd..da5c15c4f 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -620,7 +620,7 @@ static CharDriverState *qemu_chr_open_file_out(QemuOpts *opts)
 {
     int fd_out;
 
-    TFR(fd_out = open(qemu_opt_get(opts, "path"),
+    TFR(fd_out = qemu_open(qemu_opt_get(opts, "path"),
                       O_WRONLY | O_TRUNC | O_CREAT | O_BINARY, 0666));
     if (fd_out < 0)
         return NULL;
@@ -640,8 +640,8 @@ static CharDriverState *qemu_chr_open_pipe(QemuOpts *opts)
 
     snprintf(filename_in, 256, "%s.in", filename);
     snprintf(filename_out, 256, "%s.out", filename);
-    TFR(fd_in = open(filename_in, O_RDWR | O_BINARY));
-    TFR(fd_out = open(filename_out, O_RDWR | O_BINARY));
+    TFR(fd_in = qemu_open(filename_in, O_RDWR | O_BINARY));
+    TFR(fd_out = qemu_open(filename_out, O_RDWR | O_BINARY));
     if (fd_in < 0 || fd_out < 0) {
 	if (fd_in >= 0)
 	    close(fd_in);
@@ -2101,7 +2101,7 @@ static void tcp_chr_accept(void *opaque)
 	    len = sizeof(saddr);
 	    addr = (struct sockaddr *)&saddr;
 	}
-        fd = accept(s->listen_fd, addr, &len);
+        fd = qemu_accept(s->listen_fd, addr, &len);
         if (fd < 0 && errno != EINTR) {
             return;
         } else if (fd >= 0) {
diff --git a/qemu-common.h b/qemu-common.h
index 1cebbe304..5fbe0f9db 100644
--- a/qemu-common.h
+++ b/qemu-common.h
@@ -159,6 +159,13 @@ void *get_mmap_addr(unsigned long size);
 void qemu_mutex_lock_iothread(void);
 void qemu_mutex_unlock_iothread(void);
 
+int qemu_open(const char *name, int flags, ...);
+void qemu_set_cloexec(int fd);
+
+#ifndef _WIN32
+int qemu_pipe(int pipefd[2]);
+#endif
+
 /* Error handling.  */
 
 void QEMU_NORETURN hw_error(const char *fmt, ...)
diff --git a/qemu-img.c b/qemu-img.c
index 972843ab8..f19c6440e 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -743,7 +743,7 @@ static int img_convert(int argc, char **argv)
             if (n > bs_offset + bs_sectors - sector_num)
                 n = bs_offset + bs_sectors - sector_num;
 
-            if (strcmp(drv->format_name, "host_device")) {
+            if (!drv->no_zero_init) {
                 /* If the output image is being created as a copy on write image,
                    assume that sectors which are unallocated in the input image
                    are present in both the output's and input's base images (no
@@ -776,7 +776,7 @@ static int img_convert(int argc, char **argv)
                    If the output is to a host device, we also write out
                    sectors that are entirely 0, since whatever data was
                    already there is garbage, not 0s. */
-                if (strcmp(drv->format_name, "host_device") == 0 || out_baseimg ||
+                if (drv->no_zero_init || out_baseimg ||
                     is_allocated_sectors(buf1, n, &n1)) {
                     if (bdrv_write(out_bs, sector_num, buf1, n1) < 0)
                         error("error while writing");
diff --git a/qemu-sockets.c b/qemu-sockets.c
index 8801453cb..8850516f2 100644
--- a/qemu-sockets.c
+++ b/qemu-sockets.c
@@ -160,7 +160,7 @@ int inet_listen_opts(QemuOpts *opts, int port_offset)
         getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
 		        uaddr,INET6_ADDRSTRLEN,uport,32,
 		        NI_NUMERICHOST | NI_NUMERICSERV);
-        slisten = socket(e->ai_family, e->ai_socktype, e->ai_protocol);
+        slisten = qemu_socket(e->ai_family, e->ai_socktype, e->ai_protocol);
         if (slisten < 0) {
             fprintf(stderr,"%s: socket(%s): %s\n", __FUNCTION__,
                     inet_strfamily(e->ai_family), strerror(errno));
@@ -258,7 +258,7 @@ int inet_connect_opts(QemuOpts *opts)
             fprintf(stderr,"%s: getnameinfo: oops\n", __FUNCTION__);
             continue;
         }
-        sock = socket(e->ai_family, e->ai_socktype, e->ai_protocol);
+        sock = qemu_socket(e->ai_family, e->ai_socktype, e->ai_protocol);
         if (sock < 0) {
             fprintf(stderr,"%s: socket(%s): %s\n", __FUNCTION__,
             inet_strfamily(e->ai_family), strerror(errno));
@@ -351,7 +351,7 @@ int inet_dgram_opts(QemuOpts *opts)
     }
 
     /* create socket */
-    sock = socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol);
+    sock = qemu_socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol);
     if (sock < 0) {
         fprintf(stderr,"%s: socket(%s): %s\n", __FUNCTION__,
                 inet_strfamily(peer->ai_family), strerror(errno));
@@ -505,7 +505,7 @@ int unix_listen_opts(QemuOpts *opts)
     const char *path = qemu_opt_get(opts, "path");
     int sock, fd;
 
-    sock = socket(PF_UNIX, SOCK_STREAM, 0);
+    sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
     if (sock < 0) {
         perror("socket(unix)");
         return -1;
@@ -560,7 +560,7 @@ int unix_connect_opts(QemuOpts *opts)
         return -1;
     }
 
-    sock = socket(PF_UNIX, SOCK_STREAM, 0);
+    sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
     if (sock < 0) {
         perror("socket(unix)");
         return -1;
diff --git a/qemu_socket.h b/qemu_socket.h
index c253b3241..86bdbf53d 100644
--- a/qemu_socket.h
+++ b/qemu_socket.h
@@ -32,6 +32,8 @@ int inet_aton(const char *cp, struct in_addr *ia);
 #include "qemu-option.h"
 
 /* misc helpers */
+int qemu_socket(int domain, int type, int protocol);
+int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen);
 void socket_set_nonblock(int fd);
 int send_all(int fd, const void *buf, int len1);
 
diff --git a/slirp/misc.c b/slirp/misc.c
index e9f08fdac..c76ad8fef 100644
--- a/slirp/misc.c
+++ b/slirp/misc.c
@@ -132,7 +132,7 @@ fork_exec(struct socket *so, const char *ex, int do_pty)
 		addr.sin_port = 0;
 		addr.sin_addr.s_addr = INADDR_ANY;
 
-		if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0 ||
+		if ((s = qemu_socket(AF_INET, SOCK_STREAM, 0)) < 0 ||
 		    bind(s, (struct sockaddr *)&addr, addrlen) < 0 ||
 		    listen(s, 1) < 0) {
 			lprint("Error: inet socket: %s\n", strerror(errno));
@@ -165,7 +165,7 @@ fork_exec(struct socket *so, const char *ex, int do_pty)
 			 * Connect to the socket
 			 * XXX If any of these fail, we're in trouble!
 	 		 */
-			s = socket(AF_INET, SOCK_STREAM, 0);
+			s = qemu_socket(AF_INET, SOCK_STREAM, 0);
 			addr.sin_addr = loopback_addr;
                         do {
                             ret = connect(s, (struct sockaddr *)&addr, addrlen);
diff --git a/slirp/slirp.h b/slirp/slirp.h
index 9ef57ea39..98a26442a 100644
--- a/slirp/slirp.h
+++ b/slirp/slirp.h
@@ -197,6 +197,10 @@ int inet_aton(const char *cp, struct in_addr *ia);
 #include "bootp.h"
 #include "tftp.h"
 
+/* osdep.c */
+int qemu_socket(int domain, int type, int protocol);
+
+
 struct Slirp {
     QTAILQ_ENTRY(Slirp) entry;
 
diff --git a/slirp/socket.c b/slirp/socket.c
index 207109c7e..cf6e6a957 100644
--- a/slirp/socket.c
+++ b/slirp/socket.c
@@ -626,7 +626,7 @@ tcp_listen(Slirp *slirp, u_int32_t haddr, u_int hport, u_int32_t laddr,
 	addr.sin_addr.s_addr = haddr;
 	addr.sin_port = hport;
 
-	if (((s = socket(AF_INET,SOCK_STREAM,0)) < 0) ||
+	if (((s = qemu_socket(AF_INET,SOCK_STREAM,0)) < 0) ||
 	    (setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int)) < 0) ||
 	    (bind(s,(struct sockaddr *)&addr, sizeof(addr)) < 0) ||
 	    (listen(s,1) < 0)) {
diff --git a/slirp/tcp_subr.c b/slirp/tcp_subr.c
index 04173450d..7851307fa 100644
--- a/slirp/tcp_subr.c
+++ b/slirp/tcp_subr.c
@@ -325,7 +325,7 @@ int tcp_fconnect(struct socket *so)
   DEBUG_CALL("tcp_fconnect");
   DEBUG_ARG("so = %lx", (long )so);
 
-  if( (ret=so->s=socket(AF_INET,SOCK_STREAM,0)) >= 0) {
+  if( (ret = so->s = qemu_socket(AF_INET,SOCK_STREAM,0)) >= 0) {
     int opt, s=so->s;
     struct sockaddr_in addr;
 
diff --git a/slirp/udp.c b/slirp/udp.c
index a88b645cc..d6c39b97b 100644
--- a/slirp/udp.c
+++ b/slirp/udp.c
@@ -302,7 +302,7 @@ int udp_output(struct socket *so, struct mbuf *m,
 int
 udp_attach(struct socket *so)
 {
-  if((so->s = socket(AF_INET,SOCK_DGRAM,0)) != -1) {
+  if((so->s = qemu_socket(AF_INET,SOCK_DGRAM,0)) != -1) {
     so->so_expire = curtime + SO_EXPIRE;
     insque(so, &so->slirp->udb);
   }
@@ -350,7 +350,7 @@ udp_listen(Slirp *slirp, u_int32_t haddr, u_int hport, u_int32_t laddr,
 	if (!so) {
 	    return NULL;
 	}
-	so->s = socket(AF_INET,SOCK_DGRAM,0);
+	so->s = qemu_socket(AF_INET,SOCK_DGRAM,0);
 	so->so_expire = curtime + SO_EXPIRE;
 	insque(so, &slirp->udb);
 
diff --git a/vl.c b/vl.c
index 71ad502ea..a292498c8 100644
--- a/vl.c
+++ b/vl.c
@@ -1257,7 +1257,7 @@ static int hpet_start_timer(struct qemu_alarm_timer *t)
     struct hpet_info info;
     int r, fd;
 
-    fd = open("/dev/hpet", O_RDONLY);
+    fd = qemu_open("/dev/hpet", O_RDONLY);
     if (fd < 0)
         return -1;
 
@@ -1306,7 +1306,7 @@ static int rtc_start_timer(struct qemu_alarm_timer *t)
     int rtc_fd;
     unsigned long current_rtc_freq = 0;
 
-    TFR(rtc_fd = open("/dev/rtc", O_RDONLY));
+    TFR(rtc_fd = qemu_open("/dev/rtc", O_RDONLY));
     if (rtc_fd < 0)
         return -1;
     ioctl(rtc_fd, RTC_IRQP_READ, &current_rtc_freq);
@@ -2219,7 +2219,7 @@ DriveInfo *drive_init(QemuOpts *opts, void *opaque,
 
     on_read_error = BLOCK_ERR_REPORT;
     if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
-        if (1) {
+        if (type != IF_IDE && type != IF_VIRTIO) {
             fprintf(stderr, "rerror is no supported by this format\n");
             return NULL;
         }
@@ -3381,7 +3381,7 @@ static int qemu_event_init(void)
     int err;
     int fds[2];
 
-    err = pipe(fds);
+    err = qemu_pipe(fds);
     if (err == -1)
         return -errno;
 
@@ -5616,6 +5616,9 @@ int main(int argc, char **argv, char **envp)
 	} else if (pid < 0)
             exit(1);
 
+	close(fds[0]);
+	qemu_set_cloexec(fds[1]);
+
 	setsid();
 
 	pid = fork();
@@ -6020,7 +6023,7 @@ int main(int argc, char **argv, char **envp)
 	    exit(1);
 
 	chdir("/");
-	TFR(fd = open("/dev/null", O_RDWR));
+	TFR(fd = qemu_open("/dev/null", O_RDWR));
 	if (fd == -1)
 	    exit(1);
     }
diff --git a/vnc.c b/vnc.c
index 2bb802469..32c467880 100644
--- a/vnc.c
+++ b/vnc.c
@@ -2247,7 +2247,7 @@ static void vnc_listen_read(void *opaque)
     /* Catch-up */
     vga_hw_update();
 
-    int csock = accept(vs->lsock, (struct sockaddr *)&addr, &addrlen);
+    int csock = qemu_accept(vs->lsock, (struct sockaddr *)&addr, &addrlen);
     if (csock != -1) {
         vnc_connect(vs, csock);
     }