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ntdll: Add helper functions for getting and setting page protection bytes.

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Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Alexandre Julliard 2017-09-05 13:55:36 +02:00
parent 3dcc1ad4f6
commit 727b94842e
1 changed files with 48 additions and 26 deletions
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74
dlls/ntdll/virtual.c
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@ -153,6 +153,29 @@ static BOOL use_locks;
static BOOL force_exec_prot; /* whether to force PROT_EXEC on all PROT_READ mmaps */
/***********************************************************************
* get_page_vprot
*
* Return the page protection byte.
*/
static BYTE get_page_vprot( struct file_view *view, const void *addr )
{
return view->prot[((const char *)addr - (const char *)view->base) >> page_shift];
}
/***********************************************************************
* set_page_vprot
*
* Set a range of page protection bytes.
*/
static void set_page_vprot( struct file_view *view, const void *addr, size_t size, BYTE vprot )
{
BYTE *ptr = view->prot + (((const char *)addr - (const char *)view->base) >> page_shift);
memset( ptr, vprot, ROUND_SIZE( addr, size ) >> page_shift );
}
/***********************************************************************
* VIRTUAL_GetProtStr
*/
@ -197,7 +220,7 @@ static void VIRTUAL_DumpView( struct file_view *view )
{
UINT i, count;
char *addr = view->base;
BYTE prot = view->prot[0];
BYTE prot = get_page_vprot( view, addr );
TRACE( "View: %p - %p", addr, addr + view->size - 1 );
if (view->protect & VPROT_SYSTEM)
@ -211,11 +234,12 @@ static void VIRTUAL_DumpView( struct file_view *view )
for (count = i = 1; i < view->size >> page_shift; i++, count++)
{
if (view->prot[i] == prot) continue;
BYTE next = get_page_vprot( view, addr + (count << page_shift) );
if (next == prot) continue;
TRACE( " %p - %p %s\n",
addr, addr + (count << page_shift) - 1, VIRTUAL_GetProtStr(prot) );
addr += (count << page_shift);
prot = view->prot[i];
prot = next;
count = 0;
}
if (count)
@ -529,7 +553,7 @@ static NTSTATUS create_view( struct file_view **view_ret, void *base, size_t siz
view->mapping = 0;
view->map_protect = 0;
view->protect = vprot;
memset( view->prot, vprot, size >> page_shift );
set_page_vprot( view, base, size, vprot );
/* Insert it in the linked list */
@ -683,7 +707,6 @@ static BOOL VIRTUAL_SetProt( struct file_view *view, /* [in] Pointer to view */
BYTE vprot ) /* [in] Protections to use */
{
int unix_prot = VIRTUAL_GetUnixProt(vprot);
BYTE *p = view->prot + (((char *)base - (char *)view->base) >> page_shift);
TRACE("%p-%p %s\n",
base, (char *)base + size - 1, VIRTUAL_GetProtStr( vprot ) );
@ -694,6 +717,7 @@ static BOOL VIRTUAL_SetProt( struct file_view *view, /* [in] Pointer to view */
UINT i, count;
char *addr = base;
int prot;
BYTE *p = view->prot + ((addr - (char *)view->base) >> page_shift);
p[0] = vprot | (p[0] & VPROT_WRITEWATCH);
unix_prot = VIRTUAL_GetUnixProt( p[0] );
@ -718,7 +742,7 @@ static BOOL VIRTUAL_SetProt( struct file_view *view, /* [in] Pointer to view */
(base >= NtCurrentTeb()->DeallocationStack) &&
(base < NtCurrentTeb()->Tib.StackBase))
{
memset( p, vprot, size >> page_shift );
set_page_vprot( view, base, size, vprot );
mprotect( base, size, unix_prot );
VIRTUAL_DEBUG_DUMP_VIEW( view );
return TRUE;
@ -727,7 +751,7 @@ static BOOL VIRTUAL_SetProt( struct file_view *view, /* [in] Pointer to view */
if (mprotect_exec( base, size, unix_prot, view->protect )) /* FIXME: last error */
return FALSE;
memset( p, vprot, size >> page_shift );
set_page_vprot( view, base, size, vprot );
VIRTUAL_DEBUG_DUMP_VIEW( view );
return TRUE;
}
@ -996,7 +1020,7 @@ static NTSTATUS map_file_into_view( struct file_view *view, int fd, size_t start
pread( fd, ptr, size, offset );
if (prot != (PROT_READ|PROT_WRITE)) mprotect( ptr, size, prot ); /* Set the right protection */
done:
memset( view->prot + (start >> page_shift), vprot, ROUND_SIZE(start,size) >> page_shift );
set_page_vprot( view, (char *)view->base + start, size, vprot );
return STATUS_SUCCESS;
}
@ -1012,7 +1036,7 @@ static SIZE_T get_committed_size( struct file_view *view, void *base, BYTE *vpro
SIZE_T i, start;
start = ((char *)base - (char *)view->base) >> page_shift;
*vprot = view->prot[start];
*vprot = get_page_vprot( view, base );
if (view->mapping && !(view->protect & VPROT_COMMITTED))
{
@ -1035,7 +1059,7 @@ static SIZE_T get_committed_size( struct file_view *view, void *base, BYTE *vpro
return ret;
}
for (i = start + 1; i < view->size >> page_shift; i++)
if ((*vprot ^ view->prot[i]) & VPROT_COMMITTED) break;
if ((*vprot ^ get_page_vprot( view, (char *)view->base + (i << page_shift) )) & VPROT_COMMITTED) break;
return (i - start) << page_shift;
}
@ -1495,7 +1519,7 @@ NTSTATUS virtual_create_builtin_view( void *module )
if (status) return status;
/* The PE header is always read-only, no write, no execute. */
view->prot[0] = VPROT_COMMITTED | VPROT_READ;
set_page_vprot( view, view->base, page_size, VPROT_COMMITTED | VPROT_READ );
sec = (IMAGE_SECTION_HEADER *)((char *)&nt->OptionalHeader + nt->FileHeader.SizeOfOptionalHeader);
for (i = 0; i < nt->FileHeader.NumberOfSections; i++)
@ -1505,8 +1529,7 @@ NTSTATUS virtual_create_builtin_view( void *module )
if (sec[i].Characteristics & IMAGE_SCN_MEM_EXECUTE) flags |= VPROT_EXEC;
if (sec[i].Characteristics & IMAGE_SCN_MEM_READ) flags |= VPROT_READ;
if (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE) flags |= VPROT_WRITE;
memset (view->prot + (sec[i].VirtualAddress >> page_shift), flags,
ROUND_SIZE( sec[i].VirtualAddress, sec[i].Misc.VirtualSize ) >> page_shift );
set_page_vprot( view, (char *)view->base + sec[i].VirtualAddress, sec[i].Misc.VirtualSize, flags );
}
return status;
@ -1642,14 +1665,14 @@ BOOL virtual_handle_stack_fault( void *addr )
if ((view = VIRTUAL_FindView( addr, 0 )))
{
void *page = ROUND_ADDR( addr, page_mask );
BYTE vprot = view->prot[((const char *)page - (const char *)view->base) >> page_shift];
BYTE vprot = get_page_vprot( view, page );
if (vprot & VPROT_GUARD)
{
VIRTUAL_SetProt( view, page, page_size, vprot & ~VPROT_GUARD );
NtCurrentTeb()->Tib.StackLimit = page;
if ((char *)page >= (char *)NtCurrentTeb()->DeallocationStack + 2*page_size)
{
vprot = view->prot[((char *)page - page_size - (char *)view->base) >> page_shift];
vprot = get_page_vprot( view, (char *)page - page_size );
VIRTUAL_SetProt( view, (char *)page - page_size, page_size, vprot | VPROT_COMMITTED | VPROT_GUARD );
}
ret = TRUE;
@ -1747,10 +1770,9 @@ SIZE_T virtual_uninterrupted_read_memory( const void *addr, void *buffer, SIZE_T
{
if (!(view->protect & VPROT_SYSTEM))
{
void *page = ROUND_ADDR( addr, page_mask );
BYTE *p = view->prot + (((const char *)page - (const char *)view->base) >> page_shift);
char *page = ROUND_ADDR( addr, page_mask );
while (bytes_read < size && (VIRTUAL_GetUnixProt( *p++ ) & PROT_READ))
while (bytes_read < size && (VIRTUAL_GetUnixProt( get_page_vprot( view, page )) & PROT_READ))
{
SIZE_T block_size = min( size, page_size - ((UINT_PTR)addr & page_mask) );
memcpy( buffer, addr, block_size );
@ -1758,6 +1780,7 @@ SIZE_T virtual_uninterrupted_read_memory( const void *addr, void *buffer, SIZE_T
addr = (const void *)((const char *)addr + block_size);
buffer = (void *)((char *)buffer + block_size);
bytes_read += block_size;
page += page_size;
}
}
}
@ -1844,12 +1867,12 @@ void VIRTUAL_SetForceExec( BOOL enable )
UINT i, count;
char *addr = view->base;
BYTE commit = view->mapping ? VPROT_COMMITTED : 0; /* file mappings are always accessible */
int unix_prot = VIRTUAL_GetUnixProt( view->prot[0] | commit );
int unix_prot = VIRTUAL_GetUnixProt( get_page_vprot( view, addr ) | commit );
if (view->protect & VPROT_NOEXEC) continue;
for (count = i = 1; i < view->size >> page_shift; i++, count++)
{
int prot = VIRTUAL_GetUnixProt( view->prot[i] | commit );
int prot = VIRTUAL_GetUnixProt( get_page_vprot( view, addr + (count << page_shift) ) | commit );
if (prot == unix_prot) continue;
if ((unix_prot & PROT_READ) && !(unix_prot & PROT_EXEC))
{
@ -2457,18 +2480,18 @@ NTSTATUS WINAPI NtQueryVirtualMemory( HANDLE process, LPCVOID addr,
else
{
BYTE vprot;
char *ptr;
SIZE_T range_size = get_committed_size( view, base, &vprot );
info->State = (vprot & VPROT_COMMITTED) ? MEM_COMMIT : MEM_RESERVE;
info->Protect = (vprot & VPROT_COMMITTED) ? VIRTUAL_GetWin32Prot( vprot ) : 0;
info->AllocationBase = alloc_base;
info->AllocationProtect = VIRTUAL_GetWin32Prot( view->protect );
if (view->protect & VPROT_IMAGE) info->Type = MEM_IMAGE;
else if (view->protect & VPROT_VALLOC) info->Type = MEM_PRIVATE;
else info->Type = MEM_MAPPED;
for (size = base - alloc_base; size < base + range_size - alloc_base; size += page_size)
if ((view->prot[size >> page_shift] ^ vprot) & ~VPROT_WRITEWATCH) break;
info->RegionSize = size - (base - alloc_base);
for (ptr = base; ptr < base + range_size; ptr += page_size)
if ((get_page_vprot( view, ptr ) ^ vprot) & ~VPROT_WRITEWATCH) break;
info->RegionSize = ptr - base;
}
server_leave_uninterrupted_section( &csVirtual, &sigset );
@ -3003,8 +3026,7 @@ NTSTATUS WINAPI NtGetWriteWatch( HANDLE process, ULONG flags, PVOID base, SIZE_T
while (pos < *count && addr < end)
{
BYTE prot = view->prot[(addr - (char *)view->base) >> page_shift];
if (!(prot & VPROT_WRITEWATCH)) addresses[pos++] = addr;
if (!(get_page_vprot( view, addr ) & VPROT_WRITEWATCH)) addresses[pos++] = addr;
addr += page_size;
}
if (flags & WRITE_WATCH_FLAG_RESET) reset_write_watches( view, base, addr - (char *)base );