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ntdll: Use a critical section to ensure that RtlWaitOnAddress compares and queues atomically. 

Currently a wake may occur between calling compare_addr() and performing the
select request; in that case the thread will never be woken. Prevent this by
taking a CS around both operations.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=46099
Signed-off-by: Zebediah Figura <z.figura12@gmail.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Zebediah Figura 2018-11-30 19:03:57 -06:00 committed by Alexandre Julliard
parent 0ea963a406
commit 6060d2703c
1 changed files with 20 additions and 0 deletions
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20
dlls/ntdll/sync.c
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@ -1961,6 +1961,15 @@ NTSTATUS WINAPI RtlSleepConditionVariableSRW( RTL_CONDITION_VARIABLE *variable,
return status;
}
static RTL_CRITICAL_SECTION addr_section;
static RTL_CRITICAL_SECTION_DEBUG addr_section_debug =
{
0, 0, &addr_section,
{ &addr_section_debug.ProcessLocksList, &addr_section_debug.ProcessLocksList },
0, 0, { (DWORD_PTR)(__FILE__ ": addr_section") }
};
static RTL_CRITICAL_SECTION addr_section = { &addr_section_debug, -1, 0, 0, 0, 0 };
static BOOL compare_addr( const void *addr, const void *cmp, SIZE_T size )
{
switch (size)
@ -2004,8 +2013,12 @@ NTSTATUS WINAPI RtlWaitOnAddress( const void *addr, const void *cmp, SIZE_T size
for (;;)
{
RtlEnterCriticalSection( &addr_section );
if (!compare_addr( addr, cmp, size ))
{
RtlLeaveCriticalSection( &addr_section );
return STATUS_SUCCESS;
}
SERVER_START_REQ( select )
{
@ -2021,6 +2034,9 @@ NTSTATUS WINAPI RtlWaitOnAddress( const void *addr, const void *cmp, SIZE_T size
call = reply->call;
}
SERVER_END_REQ;
RtlLeaveCriticalSection( &addr_section );
if (ret == STATUS_PENDING) ret = wait_select_reply( &cookie );
if (ret != STATUS_USER_APC) break;
if (invoke_apc( &call, &result ))
@ -2043,7 +2059,9 @@ NTSTATUS WINAPI RtlWaitOnAddress( const void *addr, const void *cmp, SIZE_T size
*/
void WINAPI RtlWakeAddressAll( const void *addr )
{
RtlEnterCriticalSection( &addr_section );
while (NtReleaseKeyedEvent( 0, addr, 0, &zero_timeout ) == STATUS_SUCCESS) {}
RtlLeaveCriticalSection( &addr_section );
}
/***********************************************************************
@ -2051,5 +2069,7 @@ void WINAPI RtlWakeAddressAll( const void *addr )
*/
void WINAPI RtlWakeAddressSingle( const void *addr )
{
RtlEnterCriticalSection( &addr_section );
NtReleaseKeyedEvent( 0, addr, 0, &zero_timeout );
RtlLeaveCriticalSection( &addr_section );
}