From: "Aneesh Kumar K.V" <[email protected]> With mapped security models like mapped-xattr and mapped-file, we save the symlink target as file contents. Now if we ever expose a normal directory with mapped security model and find real symlinks in export path, never follow them and return proper error.
Signed-off-by: Aneesh Kumar K.V <[email protected]> --- hw/9pfs/virtio-9p-local.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/9pfs/virtio-9p-local.c b/hw/9pfs/virtio-9p-local.c index 6ece6f7..87aa75d 100644 --- a/hw/9pfs/virtio-9p-local.c +++ b/hw/9pfs/virtio-9p-local.c @@ -284,7 +284,7 @@ static ssize_t local_readlink(FsContext *fs_ctx, V9fsPath *fs_path, if ((fs_ctx->export_flags & V9FS_SM_MAPPED) || (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE)) { int fd; - fd = open(rpath(fs_ctx, path, buffer), O_RDONLY); + fd = open(rpath(fs_ctx, path, buffer), O_RDONLY | O_NOFOLLOW); if (fd == -1) { return -1; } -- 1.8.1.2
