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Add a WASI test for a creating an absolute-path symlink. (#6166)

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Wasmtime disallows guests from using `path_symlink` to create
absolute-path symlinks, as they could confuse other code into
accessing resources on the host that the guest otherwise doesn't
have access to.

This patch adds a test for this behavior.
This commit is contained in:
Dan Gohman
2023-04-07 23:13:50 -07:00
committed by GitHub
parent bada17beab
commit e84305b445
1 changed files with 6 additions and 0 deletions
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6
crates/test-programs/wasi-tests/src/bin/symlink_create.rs
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@@ -62,6 +62,11 @@ unsafe fn create_symlink_to_directory(dir_fd: wasi::Fd) {
.expect("remove_directory on a directory should succeed"); .expect("remove_directory on a directory should succeed");
} }
unsafe fn create_symlink_to_root(dir_fd: wasi::Fd) {
// Create a symlink.
wasi::path_symlink("/", dir_fd, "symlink").expect_err("creating a symlink to an absolute path");
}
fn main() { fn main() {
let mut args = env::args(); let mut args = env::args();
let prog = args.next().unwrap(); let prog = args.next().unwrap();
@@ -85,5 +90,6 @@ fn main() {
unsafe { unsafe {
create_symlink_to_file(dir_fd); create_symlink_to_file(dir_fd);
create_symlink_to_directory(dir_fd); create_symlink_to_directory(dir_fd);
create_symlink_to_root(dir_fd);
} }
} }