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[Qemu-devel] [V11 06/15] virtio-9p: Create support in chroot environment
From: |
M. Mohan Kumar |
Subject: |
[Qemu-devel] [V11 06/15] virtio-9p: Create support in chroot environment |
Date: |
Fri, 24 Jun 2011 13:52:15 +0530 |
From: "M. Mohan Kumar" <address@hidden>
Add both chroot worker & qemu side interfaces to create regular files in
chroot environment
Signed-off-by: M. Mohan Kumar <address@hidden>
---
hw/9pfs/virtio-9p-chroot-worker.c | 36 ++++++++++++++++++++++++++++++++++++
hw/9pfs/virtio-9p-chroot.h | 1 +
hw/9pfs/virtio-9p-local.c | 5 +++--
3 files changed, 40 insertions(+), 2 deletions(-)
diff --git a/hw/9pfs/virtio-9p-chroot-worker.c
b/hw/9pfs/virtio-9p-chroot-worker.c
index 40a54b3..581bfa95a 100644
--- a/hw/9pfs/virtio-9p-chroot-worker.c
+++ b/hw/9pfs/virtio-9p-chroot-worker.c
@@ -93,6 +93,36 @@ static int chroot_do_open(V9fsFileObjectRequest *request)
return fd;
}
+/*
+ * Helper routine to create a file and return the file descriptor
+ */
+static int chroot_do_create(V9fsFileObjectRequest *request)
+{
+ uid_t cur_uid;
+ gid_t cur_gid;
+ int fd = -1;
+
+ cur_uid = geteuid();
+ cur_gid = getegid();
+
+ if (setfsuid(request->data.uid) < 0) {
+ return -errno;
+ }
+ if (setfsgid(request->data.gid) < 0) {
+ fd = -errno;
+ goto unset_uid;
+ }
+
+ fd = open(request->path.path, request->data.flags, request->data.mode);
+ if (fd < 0) {
+ fd = -errno;
+ }
+ setfsgid(cur_gid);
+unset_uid:
+ setfsuid(cur_uid);
+ return fd;
+}
+
static void chroot_daemonize(int chroot_sock)
{
sigset_t sigset;
@@ -184,6 +214,12 @@ int v9fs_chroot(FsContext *fs_ctx)
valid_fd = 1;
}
break;
+ case T_CREATE:
+ retval = chroot_do_create(&request);
+ if (retval >= 0) {
+ valid_fd = 1;
+ }
+ break;
default:
retval = -1;
break;
diff --git a/hw/9pfs/virtio-9p-chroot.h b/hw/9pfs/virtio-9p-chroot.h
index 326238d..d5c3f37 100644
--- a/hw/9pfs/virtio-9p-chroot.h
+++ b/hw/9pfs/virtio-9p-chroot.h
@@ -4,6 +4,7 @@
#include "qemu_socket.h"
/* types for V9fsFileObjectRequest */
#define T_OPEN 1
+#define T_CREATE 2
#define V9FS_FD_VALID INT_MAX
diff --git a/hw/9pfs/virtio-9p-local.c b/hw/9pfs/virtio-9p-local.c
index 2ae4317..2ae08e8 100644
--- a/hw/9pfs/virtio-9p-local.c
+++ b/hw/9pfs/virtio-9p-local.c
@@ -455,8 +455,7 @@ static int local_open2(FsContext *fs_ctx, V9fsPath
*dir_path, const char *name,
serrno = errno;
goto err_end;
}
- } else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
- (fs_ctx->fs_sm == SM_NONE)) {
+ } else if (fs_ctx->fs_sm == SM_NONE) {
fd = open(rpath(fs_ctx, path, buffer), flags, credp->fc_mode);
if (fd == -1) {
err = fd;
@@ -467,6 +466,8 @@ static int local_open2(FsContext *fs_ctx, V9fsPath
*dir_path, const char *name,
serrno = errno;
goto err_end;
}
+ } else if (fs_ctx->fs_sm == SM_PASSTHROUGH) {
+ fd = passthrough_request(fs_ctx, NULL, path, flags, credp, T_CREATE);
}
err = fd;
goto out;
--
1.7.5.4
- [Qemu-devel] [V11 00/15] virtio-9p: Use chroot to safely access files in passthrough security model, M. Mohan Kumar, 2011/06/24
- [Qemu-devel] [V11 12/15] virtio-9p: chown in chroot environment, M. Mohan Kumar, 2011/06/24
- [Qemu-devel] [V11 11/15] virtio-9p: chmod in chroot environment, M. Mohan Kumar, 2011/06/24
- [Qemu-devel] [V11 08/15] virtio-9p: Removing file or directory in chroot environment, M. Mohan Kumar, 2011/06/24
- [Qemu-devel] [V11 07/15] virtio-9p: Creating special files in chroot environment, M. Mohan Kumar, 2011/06/24
- [Qemu-devel] [V11 13/15] virtio-9p: stat in chroot environment, M. Mohan Kumar, 2011/06/24
- [Qemu-devel] [V11 03/15] virtio-9p: Provide chroot worker side interfaces, M. Mohan Kumar, 2011/06/24
- [Qemu-devel] [V11 02/15] virtio-9p: Enable CONFIG_THREAD if CONFIG_VIRTFS is enabled, M. Mohan Kumar, 2011/06/24
- [Qemu-devel] [V11 15/15] virtio-9p: Chroot environment for other functions, M. Mohan Kumar, 2011/06/24
- [Qemu-devel] [V11 10/15] virtio-9p: Move file post creation changes to none security model, M. Mohan Kumar, 2011/06/24
- [Qemu-devel] [V11 06/15] virtio-9p: Create support in chroot environment,
M. Mohan Kumar <=
- [Qemu-devel] [V11 14/15] virtio-9p: readlink in chroot environment, M. Mohan Kumar, 2011/06/24
- [Qemu-devel] [V11 05/15] virtio-9p: Support for opening a file in chroot environment, M. Mohan Kumar, 2011/06/24
- [Qemu-devel] [V11 09/15] virtio-9p: Rename in chroot environment, M. Mohan Kumar, 2011/06/24
- [Qemu-devel] [V11 01/15] Implement qemu_read_full, M. Mohan Kumar, 2011/06/24
- [Qemu-devel] [V11 04/15] virtio-9p: qemu interfaces for chroot environment, M. Mohan Kumar, 2011/06/24
- Re: [Qemu-devel] [V11 00/15] virtio-9p: Use chroot to safely access files in passthrough security model, Blue Swirl, 2011/06/26