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advapi32: Reimplement SystemFunction036 using system interrupt information. 

Signed-off-by: Hans Leidekker <hans@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Hans Leidekker 2020-09-07 14:10:13 +02:00 committed by Alexandre Julliard
parent ec02224941
commit e9090e1c90
1 changed files with 48 additions and 14 deletions
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58
dlls/advapi32/crypt.c
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@ -2422,6 +2422,36 @@ BOOL WINAPI SystemFunction035(LPCSTR lpszDllFilePath)
return TRUE;
}
static CRITICAL_SECTION random_cs;
static CRITICAL_SECTION_DEBUG random_debug =
{
0, 0, &random_cs,
{ &random_debug.ProcessLocksList, &random_debug.ProcessLocksList },
0, 0, { (DWORD_PTR)(__FILE__ ": random_cs") }
};
static CRITICAL_SECTION random_cs = { &random_debug, -1, 0, 0, 0, 0 };
#define MAX_CPUS 128
static char random_buf[sizeof(SYSTEM_INTERRUPT_INFORMATION) * MAX_CPUS];
static ULONG random_len;
static ULONG random_pos;
/* FIXME: assumes interrupt information provides sufficient randomness */
static BOOL fill_random_buffer(void)
{
ULONG len = sizeof(SYSTEM_INTERRUPT_INFORMATION) * min( NtCurrentTeb()->Peb->NumberOfProcessors, MAX_CPUS );
NTSTATUS status;
if ((status = NtQuerySystemInformation( SystemInterruptInformation, random_buf, len, NULL )))
{
WARN( "failed to get random bytes %08x\n", status );
return FALSE;
}
random_len = len;
random_pos = 0;
return TRUE;
}
/******************************************************************************
* SystemFunction036 (ADVAPI32.@)
*
@ -2436,24 +2466,28 @@ BOOL WINAPI SystemFunction035(LPCSTR lpszDllFilePath)
* Failure: FALSE
*/
BOOLEAN WINAPI SystemFunction036(PVOID pbBuffer, ULONG dwLen)
BOOLEAN WINAPI SystemFunction036( void *buffer, ULONG len )
{
int dev_random;
char *ptr = buffer;
dev_random = open("/dev/urandom", O_RDONLY);
if (dev_random != -1)
EnterCriticalSection( &random_cs );
while (len)
{
if (read(dev_random, pbBuffer, dwLen) == (ssize_t)dwLen)
ULONG size;
if (random_pos >= random_len && !fill_random_buffer())
{
close(dev_random);
return TRUE;
SetLastError( NTE_FAIL );
LeaveCriticalSection( &random_cs );
return FALSE;
}
close(dev_random);
size = min( len, random_len - random_pos );
memcpy( ptr, random_buf + random_pos, size );
random_pos += size;
ptr += size;
len -= size;
}
else
FIXME("couldn't open /dev/urandom\n");
SetLastError(NTE_FAIL);
return FALSE;
LeaveCriticalSection( &random_cs );
return TRUE;
}
/*