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List: cygwin-patches
Subject: [PATCH] Cygwin: Fix the address of myself
From: Corinna Vinschen <corinna-cygwin () cygwin ! com>
Date: 2019-07-24 16:25:24
Message-ID: 20190724162524.5604-1-corinna-cygwin () cygwin ! com
[Download RAW message or body]
From: Corinna Vinschen <corinna@vinschen.de>
Introducing an independent Cygwin PID introduced a regression:
The expectation is that the myself pinfo pointer always points to a
specific address right in front of the loaded Cygwin DLL.
However, commit b5e1003722cb14235c4f166be72c09acdffc62ea "Cygwin:
processes: use dedicated Cygwin PID rather than Windows PID" and commit
88605243a19bbc2b6b9be36b99f513140b972e38 "Cygwin: fix child getting
another pid after spawnve" broke this. To get myself at the right
address requires to call init with h0 set to INVALID_HANDLE_VALUE or an
existing address:
void
pinfo::init (pid_t n, DWORD flag, HANDLE h0)
{
[...]
if (!h0 || myself.h)
[...]
else
{
shloc = SH_MYSELF;
if (h0 == INVALID_HANDLE_VALUE) <-- !!!
h0 = NULL;
}
That was not the case anymore after the above commits. This patch makes
sure to set the handle to INVALID_HANDLE_VALUE again when creating a new
process, so init knows that myself has to be created in the right spot.
While at it, fix a potential uninitialized handle value in
child_info_spawn::handle_spawn.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
---
winsup/cygwin/dcrt0.cc | 2 +-
winsup/cygwin/pinfo.cc | 3 +--
2 files changed, 2 insertions(+), 3 deletions(-)
diff --git a/winsup/cygwin/dcrt0.cc b/winsup/cygwin/dcrt0.cc
index fb726a739ccf..86ab7256484c 100644
--- a/winsup/cygwin/dcrt0.cc
+++ b/winsup/cygwin/dcrt0.cc
@@ -652,7 +652,7 @@ void
child_info_spawn::handle_spawn ()
{
extern void fixup_lockf_after_exec (bool);
- HANDLE h;
+ HANDLE h = INVALID_HANDLE_VALUE;
if (!dynamically_loaded || get_parent_handle ())
{
cygheap_fixup_in_child (true);
diff --git a/winsup/cygwin/pinfo.cc b/winsup/cygwin/pinfo.cc
index cdbd8bd7eaf3..b67d660ae04d 100644
--- a/winsup/cygwin/pinfo.cc
+++ b/winsup/cygwin/pinfo.cc
@@ -62,11 +62,10 @@ pinfo::thisproc (HANDLE h)
{
cygheap->pid = create_cygwin_pid ();
flags |= PID_NEW;
+ h = INVALID_HANDLE_VALUE;
}
/* spawnve'd process got pid in parent, cygheap->pid has been set in
child_info_spawn::handle_spawn. */
- else if (h == INVALID_HANDLE_VALUE)
- h = NULL;
init (cygheap->pid, flags, h);
procinfo->process_state |= PID_IN_USE;
--
2.20.1
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