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[Qemu-devel] [V11 15/15] virtio-9p: Chroot environment for other functio
From: |
M. Mohan Kumar |
Subject: |
[Qemu-devel] [V11 15/15] virtio-9p: Chroot environment for other functions |
Date: |
Fri, 24 Jun 2011 13:52:24 +0530 |
From: "M. Mohan Kumar" <address@hidden>
Add chroot functionality for system calls that can operate on a file using
relative directory file descriptor.
Signed-off-by: M. Mohan Kumar <address@hidden>
---
hw/9pfs/virtio-9p-local.c | 41 +++++++++++++++++++++++++++++++++++++++--
1 files changed, 39 insertions(+), 2 deletions(-)
diff --git a/hw/9pfs/virtio-9p-local.c b/hw/9pfs/virtio-9p-local.c
index e865cc8..5847d43 100644
--- a/hw/9pfs/virtio-9p-local.c
+++ b/hw/9pfs/virtio-9p-local.c
@@ -608,7 +608,25 @@ static int local_truncate(FsContext *ctx, V9fsPath
*fs_path, off_t size)
char buffer[PATH_MAX];
char *path = fs_path->data;
- return truncate(rpath(ctx, path, buffer), size);
+ if (ctx->fs_sm == SM_PASSTHROUGH) {
+ int fd, retval, serrno;
+ fd = passthrough_request(ctx, NULL, path, O_RDWR, NULL, T_OPEN);
+ if (fd < 0) {
+ errno = -fd;
+ return -1;
+ }
+ retval = ftruncate(fd, size);
+ if (retval < 0) {
+ serrno = errno;
+ }
+ close(fd);
+ if (retval < 0) {
+ errno = serrno;
+ }
+ return retval;
+ } else {
+ return truncate(rpath(ctx, path, buffer), size);
+ }
}
static int local_rename(FsContext *ctx, const char *oldpath,
@@ -648,8 +666,27 @@ static int local_utimensat(FsContext *s, V9fsPath *fs_path,
char buffer[PATH_MAX];
char *path = fs_path->data;
- return qemu_utimensat(AT_FDCWD, rpath(s, path, buffer), buf,
+ if (s->fs_sm == SM_PASSTHROUGH) {
+ int fd, retval, serrno = 0;
+ fd = passthrough_request(s, NULL, path,
+ O_RDONLY | O_NONBLOCK | O_NOFOLLOW, NULL, T_OPEN);
+ if (fd < 0) {
+ errno = -fd;
+ return -1;
+ }
+ retval = futimens(fd, buf);
+ if (retval < 0) {
+ serrno = errno;
+ }
+ close(fd);
+ if (retval < 0) {
+ errno = serrno;
+ }
+ return retval;
+ } else {
+ return qemu_utimensat(AT_FDCWD, rpath(s, path, buffer), buf,
AT_SYMLINK_NOFOLLOW);
+ }
}
static int local_remove(FsContext *ctx, const char *path)
--
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 <=
- [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, 2011/06/24
- [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