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[Qemu-devel] [PATCH RFC 09/36] 9pfs: local: post link operation for mapp
From: |
Greg Kurz |
Subject: |
[Qemu-devel] [PATCH RFC 09/36] 9pfs: local: post link operation for mapped-file security |
Date: |
Mon, 30 Jan 2017 13:10:44 +0100 |
User-agent: |
StGit/0.17.1-20-gc0b1b-dirty |
The link operation is really the same for the passthrough and mapped
security models. This patch simply moves the mapped-file bits to a
separate function. This will make future modifications easier.
This doesn't fix any bug, it is just preparatory cleanup.
Signed-off-by: Greg Kurz <address@hidden>
---
hw/9pfs/9p-local.c | 42 ++++++++++++++++++++++++++++++------------
1 file changed, 30 insertions(+), 12 deletions(-)
diff --git a/hw/9pfs/9p-local.c b/hw/9pfs/9p-local.c
index c0b1907f7901..ebc3e208efa0 100644
--- a/hw/9pfs/9p-local.c
+++ b/hw/9pfs/9p-local.c
@@ -1108,6 +1108,35 @@ static int local_symlink(FsContext *fs_ctx, const char
*oldpath,
g_assert_not_reached();
}
+static int local_post_link_mapped_file(FsContext *ctx, V9fsPath *oldpath,
+ V9fsPath *dirpath, const char *name)
+{
+ int ret;
+ V9fsString newpath;
+ char *buffer, *buffer1;
+
+ v9fs_string_init(&newpath);
+ v9fs_string_sprintf(&newpath, "%s/%s", dirpath->data, name);
+
+ /* Link the .virtfs_metadata files. Create the metada directory */
+ ret = local_create_mapped_attr_dir(ctx, newpath.data);
+ if (ret < 0) {
+ goto out;
+ }
+ buffer = local_mapped_attr_path(ctx, oldpath->data);
+ buffer1 = local_mapped_attr_path(ctx, newpath.data);
+ ret = link(buffer, buffer1);
+ g_free(buffer);
+ g_free(buffer1);
+ if (ret < 0 && errno == ENOENT) {
+ ret = 0;
+ }
+
+out:
+ v9fs_string_free(&newpath);
+ return ret;
+}
+
static int local_link(FsContext *ctx, V9fsPath *oldpath,
V9fsPath *dirpath, const char *name)
{
@@ -1129,21 +1158,10 @@ static int local_link(FsContext *ctx, V9fsPath *oldpath,
/* now link the virtfs_metadata files */
if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
- char *vbuffer, *vbuffer1;
-
- /* Link the .virtfs_metadata files. Create the metada directory */
- ret = local_create_mapped_attr_dir(ctx, newpath.data);
+ ret = local_post_link_mapped_file(ctx, oldpath, dirpath, name);
if (ret < 0) {
goto err_out;
}
- vbuffer = local_mapped_attr_path(ctx, oldpath->data);
- vbuffer1 = local_mapped_attr_path(ctx, newpath.data);
- ret = link(vbuffer, vbuffer1);
- g_free(vbuffer);
- g_free(vbuffer1);
- if (ret < 0 && errno != ENOENT) {
- goto err_out;
- }
}
goto out;
- [Qemu-devel] [PATCH RFC 00/36] 9pfs: local: fix vulnerability to symlink attacks, Greg Kurz, 2017/01/30
- [Qemu-devel] [PATCH RFC 01/36] 9pfs: local: move xattr security ops to 9p-xattr.c, Greg Kurz, 2017/01/30
- [Qemu-devel] [PATCH RFC 02/36] 9pfs: local: split chmod operation per security model, Greg Kurz, 2017/01/30
- [Qemu-devel] [PATCH RFC 03/36] 9pfs: local: split mknod operation per security model, Greg Kurz, 2017/01/30
- [Qemu-devel] [PATCH RFC 04/36] 9pfs: local: split mkdir operation per security model, Greg Kurz, 2017/01/30
- [Qemu-devel] [PATCH RFC 05/36] 9pfs: local: split open2 operation per security model, Greg Kurz, 2017/01/30
- [Qemu-devel] [PATCH RFC 08/36] 9pfs: local: improve error handling in link op, Greg Kurz, 2017/01/30
- [Qemu-devel] [PATCH RFC 09/36] 9pfs: local: post link operation for mapped-file security,
Greg Kurz <=
- [Qemu-devel] [PATCH RFC 07/36] 9pfs: local: split mkdir operation per security model, Greg Kurz, 2017/01/30
- [Qemu-devel] [PATCH RFC 10/36] v9fs: local: improve error handling in rename op, Greg Kurz, 2017/01/30
- [Qemu-devel] [PATCH RFC 11/36] 9pfs: local: post rename operation for mapped-file security, Greg Kurz, 2017/01/30
- [Qemu-devel] [PATCH RFC 12/36] 9pfs: local: pre remove operation for mapped-file security, Greg Kurz, 2017/01/30
- [Qemu-devel] [PATCH RFC 06/36] 9pfs: local: split symlink operation per security model, Greg Kurz, 2017/01/30
- [Qemu-devel] [PATCH RFC 13/36] 9pfs: local: pre unlikat operation for mapped-file security, Greg Kurz, 2017/01/30
- [Qemu-devel] [PATCH RFC 14/36] 9pfs: remove side-effects in local_init(), Greg Kurz, 2017/01/30
- [Qemu-devel] [PATCH RFC 15/36] 9pfs: remove side-effects in local_open() and local_opendir(), Greg Kurz, 2017/01/30
- [Qemu-devel] [PATCH RFC 16/36] 9pfs: introduce openat_nofollow() helper, Greg Kurz, 2017/01/30
- [Qemu-devel] [PATCH RFC 17/36] 9pfs: local: keep a file descriptor on the shared folder, Greg Kurz, 2017/01/30