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virtio-9p: Implemented Security model for lstat and fstat 

Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Venkateswararao Jujjuri (JV) 2010-06-14 13:34:44 -07:00 committed by Anthony Liguori
parent f7613bee32
commit 1237ad7607
1 changed files with 58 additions and 4 deletions
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62
hw/virtio-9p-local.c
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@ -27,9 +27,38 @@ static const char *rpath(FsContext *ctx, const char *path)
return buffer; return buffer;
} }
static int local_lstat(FsContext *ctx, const char *path, struct stat *stbuf)
static int local_lstat(FsContext *fs_ctx, const char *path, struct stat *stbuf)
{ {
return lstat(rpath(ctx, path), stbuf); int err;
err = lstat(rpath(fs_ctx, path), stbuf);
if (err) {
return err;
}
if (fs_ctx->fs_sm == SM_MAPPED) {
/* Actual credentials are part of extended attrs */
uid_t tmp_uid;
gid_t tmp_gid;
mode_t tmp_mode;
dev_t tmp_dev;
if (getxattr(rpath(fs_ctx, path), "user.virtfs.uid", &tmp_uid,
sizeof(uid_t)) > 0) {
stbuf->st_uid = tmp_uid;
}
if (getxattr(rpath(fs_ctx, path), "user.virtfs.gid", &tmp_gid,
sizeof(gid_t)) > 0) {
stbuf->st_gid = tmp_gid;
}
if (getxattr(rpath(fs_ctx, path), "user.virtfs.mode", &tmp_mode,
sizeof(mode_t)) > 0) {
stbuf->st_mode = tmp_mode;
}
if (getxattr(rpath(fs_ctx, path), "user.virtfs.rdev", &tmp_dev,
sizeof(dev_t)) > 0) {
stbuf->st_rdev = tmp_dev;
}
}
return err;
} }
static int local_set_xattr(const char *path, FsCred *credp) static int local_set_xattr(const char *path, FsCred *credp)
@ -171,9 +200,34 @@ static int local_mkdir(FsContext *ctx, const char *path, mode_t mode)
return mkdir(rpath(ctx, path), mode); return mkdir(rpath(ctx, path), mode);
} }
static int local_fstat(FsContext *ctx, int fd, struct stat *stbuf) static int local_fstat(FsContext *fs_ctx, int fd, struct stat *stbuf)
{ {
return fstat(fd, stbuf); int err;
err = fstat(fd, stbuf);
if (err) {
return err;
}
if (fs_ctx->fs_sm == SM_MAPPED) {
/* Actual credentials are part of extended attrs */
uid_t tmp_uid;
gid_t tmp_gid;
mode_t tmp_mode;
dev_t tmp_dev;
if (fgetxattr(fd, "user.virtfs.uid", &tmp_uid, sizeof(uid_t)) > 0) {
stbuf->st_uid = tmp_uid;
}
if (fgetxattr(fd, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) {
stbuf->st_gid = tmp_gid;
}
if (fgetxattr(fd, "user.virtfs.mode", &tmp_mode, sizeof(mode_t)) > 0) {
stbuf->st_mode = tmp_mode;
}
if (fgetxattr(fd, "user.virtfs.rdev", &tmp_dev, sizeof(dev_t)) > 0) {
stbuf->st_rdev = tmp_dev;
}
}
return err;
} }
static int local_open2(FsContext *ctx, const char *path, int flags, mode_t mode) static int local_open2(FsContext *ctx, const char *path, int flags, mode_t mode)