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Added patch to avoid holding reference on parent process in wineserver.

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This commit is contained in:
Sebastian Lackner
2015-12-10 06:03:53 +01:00
parent cde035a721
commit ffa55dcc00
8 changed files with 155 additions and 71 deletions
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113
patches/server-Parent_Process/0001-server-Do-not-hold-reference-on-parent-process.patch Normal file
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@@ -0,0 +1,113 @@
From b71aa6b6bdf71f3a5d006a5d2b1c109a29af75af Mon Sep 17 00:00:00 2001
From: Sebastian Lackner <sebastian@fds-team.de>
Date: Thu, 10 Dec 2015 05:55:41 +0100
Subject: server: Do not hold reference on parent process.
---
server/console.c | 3 +--
server/process.c | 7 +++----
server/process.h | 2 +-
server/snapshot.c | 2 +-
server/thread.c | 2 +-
5 files changed, 7 insertions(+), 9 deletions(-)
diff --git a/server/console.c b/server/console.c
index a57b2fe..3d0e0e0 100644
--- a/server/console.c
+++ b/server/console.c
@@ -1425,13 +1425,12 @@ DECL_HANDLER(alloc_console)
case 0:
/* renderer is current, console to be attached to parent process */
renderer = current;
- if (!(process = current->process->parent))
+ if (!(process = get_process_from_id( current->process->parent_id )))
{
if (fd != -1) close( fd );
set_error( STATUS_ACCESS_DENIED );
return;
}
- grab_object( process );
attach = 1;
break;
case 0xffffffff:
diff --git a/server/process.c b/server/process.c
index e00b429..1fdaaca 100644
--- a/server/process.c
+++ b/server/process.c
@@ -502,7 +502,7 @@ struct thread *create_process( int fd, struct thread *parent_thread, int inherit
close( fd );
goto error;
}
- process->parent = NULL;
+ process->parent_id = 0;
process->debugger = NULL;
process->handles = NULL;
process->msg_fd = NULL;
@@ -554,7 +554,7 @@ struct thread *create_process( int fd, struct thread *parent_thread, int inherit
else
{
struct process *parent = parent_thread->process;
- process->parent = (struct process *)grab_object( parent );
+ process->parent_id = parent->id;
process->handles = inherit_all ? copy_handle_table( process, parent )
: alloc_handle_table( process, 0 );
/* Note: for security reasons, starting a new process does not attempt
@@ -621,7 +621,6 @@ static void process_destroy( struct object *obj )
release_object( process->job );
}
if (process->console) release_object( process->console );
- if (process->parent) release_object( process->parent );
if (process->msg_fd) release_object( process->msg_fd );
list_remove( &process->entry );
if (process->idle_event) release_object( process->idle_event );
@@ -1350,7 +1349,7 @@ DECL_HANDLER(get_process_info)
if ((process = get_process_from_handle( req->handle, PROCESS_QUERY_LIMITED_INFORMATION )))
{
reply->pid = get_process_id( process );
- reply->ppid = process->parent ? get_process_id( process->parent ) : 0;
+ reply->ppid = process->parent_id;
reply->exit_code = process->exit_code;
reply->priority = process->priority;
reply->affinity = process->affinity;
diff --git a/server/process.h b/server/process.h
index fa7f60d..34b6ea6 100644
--- a/server/process.h
+++ b/server/process.h
@@ -56,7 +56,7 @@ struct process
{
struct object obj; /* object header */
struct list entry; /* entry in system-wide process list */
- struct process *parent; /* parent process */
+ process_id_t parent_id; /* parent process id (at the time of creation) */
struct list thread_list; /* thread list */
struct thread *debugger; /* thread debugging this process */
struct handle_table *handles; /* handle entries */
diff --git a/server/snapshot.c b/server/snapshot.c
index dd00bd1..bec281d 100644
--- a/server/snapshot.c
+++ b/server/snapshot.c
@@ -113,7 +113,7 @@ static int snapshot_next_process( struct snapshot *snapshot, struct next_process
ptr = &snapshot->processes[snapshot->process_pos++];
reply->count = ptr->count;
reply->pid = get_process_id( ptr->process );
- reply->ppid = ptr->process->parent ? get_process_id( ptr->process->parent ) : 0;
+ reply->ppid = ptr->process->parent_id;
reply->threads = ptr->threads;
reply->priority = ptr->priority;
reply->handles = ptr->handles;
diff --git a/server/thread.c b/server/thread.c
index bad2231..176cf44 100644
--- a/server/thread.c
+++ b/server/thread.c
@@ -1300,7 +1300,7 @@ DECL_HANDLER(init_thread)
process->peb = req->entry;
process->cpu = req->cpu;
reply->info_size = init_process( current );
- if (!process->parent)
+ if (!process->parent_id)
process->affinity = current->affinity = get_thread_affinity( current );
else
set_thread_affinity( current, current->affinity );
--
2.6.2

26
patches/server-Parent_Process/0002-server-Increase-size-of-PID-table-to-512-to-reduce-r.patch Normal file
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@@ -0,0 +1,26 @@
From d99e740d73f63cb26e638c6daa550eb2bb28d061 Mon Sep 17 00:00:00 2001
From: Sebastian Lackner <sebastian@fds-team.de>
Date: Thu, 10 Dec 2015 05:57:34 +0100
Subject: server: Increase size of PID table to 512 to reduce risk of
collisions.
---
server/process.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/server/process.c b/server/process.c
index 1fdaaca..d7ddc21 100644
--- a/server/process.c
+++ b/server/process.c
@@ -361,7 +361,7 @@ unsigned int alloc_ptid( void *ptr )
else /* need to grow the array */
{
unsigned int count = alloc_ptid_entries + (alloc_ptid_entries / 2);
- if (!count) count = 64;
+ if (!count) count = 512;
if (!(entry = realloc( ptid_entries, count * sizeof(*entry) )))
{
set_error( STATUS_NO_MEMORY );
--
2.6.2

1
patches/server-Parent_Process/definition Normal file
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@@ -0,0 +1 @@
Fixes: [37087] Do not hold reference on parent process in wineserver