https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=4c09dc4f9c1c3d6c6510b8976d4da99c82ae9a26
commit 4c09dc4f9c1c3d6c6510b8976d4da99c82ae9a26 Author: Corinna Vinschen <[email protected]> Date: Tue May 25 21:46:13 2021 +0200 Cygwin: cwdstuff: check if /dev exists /dev has been handled as virtual dir in cwdstuff, thus not allowing to start native apps from /dev as CWD, even if /dev actually exists on disk. Unfortunately this also affects Cygwin executables started from a debugger. When chdir'ing to /dev, check if /dev exists on disk. If so, treat it as any other existing path. Signed-off-by: Corinna Vinschen <[email protected]> Diff: --- winsup/cygwin/path.cc | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/winsup/cygwin/path.cc b/winsup/cygwin/path.cc index 39ba17514..53cdc282d 100644 --- a/winsup/cygwin/path.cc +++ b/winsup/cygwin/path.cc @@ -4886,6 +4886,7 @@ cwdstuff::set (path_conv *nat_cwd, const char *posix_cwd) { NTSTATUS status; UNICODE_STRING upath; + OBJECT_ATTRIBUTES attr; PEB &peb = *NtCurrentTeb ()->Peb; bool virtual_path = false; bool unc_path = false; @@ -4927,7 +4928,23 @@ cwdstuff::set (path_conv *nat_cwd, const char *posix_cwd) { upath = *nat_cwd->get_nt_native_path (); if (nat_cwd->isspecial ()) - virtual_path = true; + { + virtual_path = true; + /* But allow starting of native apps from /dev if /dev actually + exists on disk. */ + if (isdev_dev (nat_cwd->dev)) + { + FILE_BASIC_INFORMATION fbi; + + InitializeObjectAttributes (&attr, &upath, + OBJ_CASE_INSENSITIVE | OBJ_INHERIT, + NULL, NULL); + status = NtQueryAttributesFile (&attr, &fbi); + if (status != STATUS_OBJECT_NAME_NOT_FOUND + && status != STATUS_OBJECT_PATH_NOT_FOUND) + virtual_path = false; + } + } } /* Memorize old DismountCount before opening the dir. This value is @@ -4944,7 +4961,6 @@ cwdstuff::set (path_conv *nat_cwd, const char *posix_cwd) if (!virtual_path) { IO_STATUS_BLOCK io; - OBJECT_ATTRIBUTES attr; if (!nat_cwd) {
