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ntdll: Add a helper function for applying page protection bytes with mprotect. 

Signed-off-by: Alexandre Julliard <julliard@winehq.org>
oldstable
Alexandre Julliard 2017-09-05 14:28:27 +02:00
parent e4b5e5da8a
commit 4069c4a4d1
1 changed files with 33 additions and 63 deletions
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96
dlls/ntdll/virtual.c
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@ -707,6 +707,32 @@ static inline int mprotect_exec( void *base, size_t size, int unix_prot, unsigne
return mprotect( base, size, unix_prot );
}
/***********************************************************************
* mprotect_range
*
* Call mprotect on a page range, applying the protections from the per-page byte.
*/
static void mprotect_range( struct file_view *view, void *base, size_t size, BYTE set, BYTE clear )
{
size_t i, count;
char *addr = base;
int prot, next;
prot = VIRTUAL_GetUnixProt( (get_page_vprot( view, addr ) & ~clear ) | set );
for (count = i = 1; i < size >> page_shift; i++, count++)
{
next = VIRTUAL_GetUnixProt( (get_page_vprot( view, addr + (count << page_shift) ) & ~clear) | set );
if (next == prot) continue;
mprotect_exec( addr, count << page_shift, prot, view->protect );
addr += count << page_shift;
prot = next;
count = 0;
}
if (count) mprotect_exec( addr, count << page_shift, prot, view->protect );
}
/***********************************************************************
* VIRTUAL_SetProt
*
@ -729,22 +755,8 @@ static BOOL VIRTUAL_SetProt( struct file_view *view, /* [in] Pointer to view */
if (view->protect & VPROT_WRITEWATCH)
{
/* each page may need different protections depending on write watch flag */
UINT i, count;
char *addr = base;
int prot;
set_page_vprot_bits( view, base, size, vprot & ~VPROT_WRITEWATCH, ~vprot & ~VPROT_WRITEWATCH );
unix_prot = VIRTUAL_GetUnixProt( get_page_vprot( view, addr ));
for (count = i = 1; i < size >> page_shift; i++, count++)
{
prot = VIRTUAL_GetUnixProt( get_page_vprot( view, addr + (count << page_shift) ));
if (prot == unix_prot) continue;
mprotect_exec( addr, count << page_shift, unix_prot, view->protect );
addr += count << page_shift;
unix_prot = prot;
count = 0;
}
if (count) mprotect_exec( addr, count << page_shift, unix_prot, view->protect );
mprotect_range( view, base, size, 0, 0 );
VIRTUAL_DEBUG_DUMP_VIEW( view );
return TRUE;
}
@ -777,22 +789,8 @@ static BOOL VIRTUAL_SetProt( struct file_view *view, /* [in] Pointer to view */
*/
static void reset_write_watches( struct file_view *view, void *base, SIZE_T size )
{
SIZE_T i, count;
int prot, unix_prot;
char *addr = base;
set_page_vprot_bits( view, base, size, VPROT_WRITEWATCH, 0 );
unix_prot = VIRTUAL_GetUnixProt( get_page_vprot( view, addr ));
for (count = i = 1; i < size >> page_shift; i++, count++)
{
prot = VIRTUAL_GetUnixProt( get_page_vprot( view, addr + (count << page_shift) ));
if (prot == unix_prot) continue;
mprotect_exec( addr, count << page_shift, unix_prot, view->protect );
addr += count << page_shift;
unix_prot = prot;
count = 0;
}
if (count) mprotect_exec( addr, count << page_shift, unix_prot, view->protect );
mprotect_range( view, base, size, 0, 0 );
}
@ -1625,14 +1623,15 @@ NTSTATUS virtual_handle_fault( LPCVOID addr, DWORD err, BOOL on_signal_stack )
if (vprot & VPROT_WRITEWATCH)
{
set_page_vprot_bits( view, page, page_size, 0, VPROT_WRITEWATCH );
VIRTUAL_SetProt( view, page, page_size, get_page_vprot( view, page ));
mprotect_range( view, page, page_size, 0, 0 );
}
/* ignore fault if page is writable now */
if (VIRTUAL_GetUnixProt( get_page_vprot( view, page )) & PROT_WRITE) ret = STATUS_SUCCESS;
}
if (!on_signal_stack && (vprot & VPROT_GUARD))
{
VIRTUAL_SetProt( view, page, page_size, vprot & ~VPROT_GUARD );
set_page_vprot_bits( view, page, page_size, 0, VPROT_GUARD );
mprotect_range( view, page, page_size, 0, 0 );
ret = STATUS_GUARD_PAGE_VIOLATION;
}
}
@ -1835,7 +1834,7 @@ SIZE_T virtual_uninterrupted_write_memory( void *addr, const void *buffer, SIZE_
if (vprot & VPROT_WRITEWATCH)
{
set_page_vprot_bits( view, page, page_size, 0, VPROT_WRITEWATCH );
VIRTUAL_SetProt( view, page, page_size, get_page_vprot( view, page ));
mprotect_range( view, page, page_size, 0, 0 );
}
/* ignore fault if page is writable now */
if (!(VIRTUAL_GetUnixProt( get_page_vprot( view, page )) & PROT_WRITE))
@ -1873,39 +1872,10 @@ void VIRTUAL_SetForceExec( BOOL enable )
LIST_FOR_EACH_ENTRY( view, &views_list, struct file_view, entry )
{
UINT i, count;
char *addr = view->base;
BYTE commit = view->mapping ? VPROT_COMMITTED : 0; /* file mappings are always accessible */
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( get_page_vprot( view, addr + (count << page_shift) ) | commit );
if (prot == unix_prot) continue;
if ((unix_prot & PROT_READ) && !(unix_prot & PROT_EXEC))
{
TRACE( "%s exec prot for %p-%p\n",
force_exec_prot ? "enabling" : "disabling",
addr, addr + (count << page_shift) - 1 );
mprotect( addr, count << page_shift,
unix_prot | (force_exec_prot ? PROT_EXEC : 0) );
}
addr += (count << page_shift);
unix_prot = prot;
count = 0;
}
if (count)
{
if ((unix_prot & PROT_READ) && !(unix_prot & PROT_EXEC))
{
TRACE( "%s exec prot for %p-%p\n",
force_exec_prot ? "enabling" : "disabling",
addr, addr + (count << page_shift) - 1 );
mprotect( addr, count << page_shift,
unix_prot | (force_exec_prot ? PROT_EXEC : 0) );
}
}
mprotect_range( view, view->base, view->size, commit, 0 );
}
}
server_leave_uninterrupted_section( &csVirtual, &sigset );